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Item found in the following categories;
> Servos and parts > All Servos
> Servos and parts > HXT Servo
> Servos and parts > Micro Servo 0-10g

PRODUCT ID: HXT900
RATED:
HXT900 9g / 1.6kg / .12sec Micro Servo
HXT900 9g / 1.6kg / .12sec Micro Servo


HXT900, one of the most famous and the best value micro servos available.
Used by tens of thousands of hobbyiests world wide. The HXT900 is the #1 trusted low cost 9g servo.

Size : 21x12x22 mm / 0.74x0.42x0.78 in
Voltage : 3v ~ 6v
Weight: 9g / 0.32oz
Speed : 0.12 sec/60(4.8V)
Torque : 1.6 kg-cm
Working Temp : -30C~60C
Teflon Bushing, 15cm wire, coreless motor
Servo arms & screw included

WARNING
These servos can be found on eBay and other asian sellers at close to this price, however be warned, they do not contain Taiwan/Japan components. HexTronik (the manufacturers of these servos) have two standards, one is for local sale, and the other is export quality with imported connectors and resin gears from Taiwan and Japan.
Our HXT500 and HXT900 are export only, and not built for the domestic market. You will not find the same quality servo for less, anywhere!

Weight (g) 9
Torque (kg) 1.6
Speed (Sec/60deg) 0.12
A(mm) 29
B(mm) 23
C(mm) 26
D(mm) 12
E(mm) 32
F(mm) 16
Update/Add my own data
Customer Data
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18g 10+ $2.69
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 Customer rated 5 crowns   
 
View all comments | (63 threads)
Ask a question
30/07/2010
hgjrukl (100%)
Very Important !! I have a 1.5 Kg and fly gliders very good, I make the first flights with care to ensure the perfect operation
26/07/2010
hgjrukl (100%)
Is an excellent high-torque servo, I have 6, only one went wrong
   recycle (84%)
What a good servo!!! I have plenty and use them in my planes & heli's.
   garett (87%)
I bought 12 when it was 2.49 and now it's 2.69, inflation? :)
   Rifki (86%)
its good one. i used it at my 450 heli and also for rudder servo. no problem until now :)
   Junior (-40%)
I have too
   Dareba (30%)
it is got Servo. Iam 10 pcs and all OK
26/07/2010
ho Godfrey (100%)
will this fit hk pitts and skyartec cessna 182?
   Joker (70%)
Yes. IT'S good!
16/07/2010
Yesyns (24%)
I used it on my TRex 450. Result is that it is not recommend to use it on the tail. Not last long, about 30min life after 5 flights(~5min per flight)....
   Aefer (31%)
Yes it is too slow for a tail servo. I use them as cyclics though.
   vynner (64%)
well obviously this is not a tail servo.. for cyclic its ok.. do get a digital tail servo for your tail.. you may have to spend a little bit more but you will save more in the long run avoiding tail servo failure, save your heli and helps you fly more confidently and safer...
   Ripumar (50%)
los servos hxt 900 no son para usarlos en la cola de helicoptero se usan digitales
   TONY.ALVES (55%)
Witch gyro are you using?
   tommo85 (42%)
DEFINETLY DO NOT USE AS A TAIL SERVO! Only ever use proper servos rated for such use. Because of the nature of the signal coming from the gyro, tail servos are under constant load, ALWAYS in transit mode, even though, we as humans, may not be able to see it moving, however you can hear it. Not to mention, that it is very much on the slow side to be a tail servo too. Also, it is not digital, so not as accurate, try a MKS DS545
   bluecreed (100%)
have you tried on cyclic and was ok?
   Yesyns (24%)
Yes, for Cyclic is much better and a bit longer in usage as long as your heli not crashed. If so then you have to observe it again* need to replace if not moving or jittering. Those who want to use it for tail servo, its your own risk....... *)
11/07/2010
Adenilson (0%)
Sempre uso servos da HXT so muito bons, uso at nos helicopteros
   vynner (64%)
it can be used with a 450 size and below helicopter for its cyclic..
   TONY.ALVES (55%)
Eu tambm , nunca tive problemas.
26/06/2010
calee (13%)
Hi friends:
Is this a DIGITAL servo?.
If not, do I have to switch off in DS switch in Gyro?(Hobby King 401B AVCS Digital Head Lock Gyro)
Thanks a lot
   Bikalho (58%)
This is not a digital servo, if you are going to use it with this gyro you will have to switch off de DS switch in gyro.
   Waco (78%)
Yes, HXT900 is not a digital servo. If you will use this servo with Gyro, you must switch off digital mode and use analog mode (see manual).
   tommo85 (42%)
this is not a digital servo, and is not recommended at all, for a tail servo for any helicopter under any circumstances. spend some more money and get a decent tail servo, it will make your life so much easier. Try a MKS DS-545 or similar for a 450 sized heli. however if you were to use this as a tail servo, set the gyro on servo type to normal or standard. then set direction and limits accordingly.
This customer was awarded a credit for their answer.
   Horacio (64%)
No, that is NOT a digital servo and yes, you must switch off the DS in the gyro.
   JpM (40%)
Hello.
No, this is not a digital servo.
Yes, you must put the swith the gyro in standard mode (SS) and not (DS) Digital mode.
   RGS2010 (49%)
This is NOT a digital servo. I can't help you with the second part of your question.
   troll32 (32%)
hello this is NOT a digital servo... so switch off ds mode on your gyro
   SIGLOCK (34%)
although the hxt900 are strong and reliable servos, they are not digital and you should turn off ds on your gyro.
   Michael (24%)
it is an analog servo - switch your gyro to mode for analog servo use!
   Tyio (67%)
Hi :) no, it's analog servo, you have to put the DS off *)
   ay6810 (57%)
Definitely not digital.
   fordfm (39%)
HTX900 is not digital servo.
   tom999 (34%)
This is not a digital servo.
   rustynail (17%)
This is not a digital servo
   Wiretap (28%)
This is an analogue servo, use the gyro in analogue mode or you will burn out the control board.
   ay6810 (57%)
No, its not a digital servo and yes you have to turn off the 'D' selector.
   chrisn (58%)
The servo is analogue, not digital.
   teflon don (24%)
this is not a digital servo and yes you have to put the ds switch in the off position
   Grigorij (20%)
no. this is analog.
   vfrjohn (60%)
This is NOT a digital servo. Set the DS switch to OFF.
   Darivi (48%)
Para los espaoles, este no es un servo digital, es analogico. En el gyro poner DS en off.
   jbeauvil001 (-20%)
no this is not a digital servo. And it is best to use a fast digital servo with your gyro. this servo is not really suitable for a gyro application
   traykov (20%)
It is NOT digital servo and you MUST switch off the DS mode in gyro! If you try to use it with DS mode "ON" you will burn the servo!!!
   Asad (96%)
No, this is not a digital servo. Dunno about the gyro setting.
   Yesyns (24%)
HXT900 is Not Digital servo. Any gyro that has swith Digital and Normal must select to Normal. I used it on my Assan GA-410 and quiet good indeed...
   Thorb (71%)
hello, if you use this servo with a gyro HK401B, you must actually turn the DS switch to the off position
   henrique.pgs (25%)
Yes, if you dont do it you can burn your servo. Do not use this servo with the hk401 gyro, is better take a faster and digital servo. this gyro is too good!
   imotox (0%)
It is an analog servo so yes the switch needs to be off.
   troll32 (32%)
this servo is ok with hk401b bit it s not the best one....a little bit too slow personnaly i use ds480 and i m happy with it
   ay6810 (57%)
No and yes respectively.
   Mnemic (0%)
Heyas, This is NOT a digital Servo. Most 401 Type Gyros have a little toggle to decide either Digital or Analog. Be sure you set it to Analog on the Gyro.
   nestel (0%)
This is not a digital servo. The DS (Digital Servo) switch has to be in the OFF possition.
   MikroHeliPilot (49%)
This is not a digital servo - it is analog. Set gyro accordingly!
   TONY.ALVES (55%)
This is not a digital servo, dont put the giro on digital mode or you can burn the servo...
   buffalochill (0%)
This is no tailservo ! Its for the swashplate
   Dareba (30%)
This servo is not digital.
8/06/2010
Aefer (31%)
I ordered 4 of these, but all of them do not have a spline cut into the horn mount, instead it is like a 9 side polygon with 'attempts' at a spline on a small bit of it. the horns cannot fit onto it. does anyone have any suggestions?
   Asad (96%)
Have you tried using a bit of force? That worked for me.
This customer was awarded a credit for their answer.
   Graham Daniel (45%)
That's not normal, mine came with proper splines.
   brushlesspower (0%)
I am using mine on a Micro-t, and I just pushed the horn onto the horn mount and it seems like a snug fit, but I know what you mean, the horn mount is a strange shape.
   RC MAVEN (23%)
I've got a bunch of these servos and never had that problem. You might have got a defective batch. Great servos, I will buy more of them.
   Napstr (93%)
Gees that would depend on what tools you have available - at any rate the cheapest and best option would be to purchase some replacement gear sets - even though they are 1/3 the cost of the servo it is still a cheap unit! otherwise cast aside as spares - unfortunately it appears you got a bad batch. Small consolidation is that the mishapen output gear is normally not the gear that is stripped so you will still end up with a useable gear set.
   tommo85 (42%)
Man that sucks. Buy some more servos, and pray for some better horns. You strip servos and kill pots like crazy using these in a 450 heli. Yet horns never die, so just keep all the old horns out of all your old servo boxes, they do come in handy sometimes.
   Aefer (31%)
Thanks all for your answers. the horns did press on with some reansonable force. bit nervous forcing fragile plastic bits together :S Installed them in the heli and they work great.
   vfrjohn (60%)
Aefer- I just received 4 of them also. They look like you describe. The splines are there but faint. I can feel them with my fingernail, though, and when I jammed a horn onto the shaft (with a little force) it seemed to be fine. I suggest you try a 'slightly bigger hammer'! (aka, go ahead and push a little harder.) :) vfrjohn
   TONY.ALVES (55%)
No entendi a pergunta pois meu ingles no suporta este nvel.
5/06/2010
Dmitry (29%)
Did anyone received this with coreless motor, 15cm wire and teflon bushing?
Mine has simple brushed motor, 25cm wire and no any bushing.
Even visually, the motor looks on product photo a bit different.
   Graham Daniel (45%)
No, it's a cheap servo, good value for not much money. No coreless motor at this price. If you are learning though (to fly), then buy a few spare gear sets, or get a metal gear equivalent.
   Aykut (23%)
Coreless motors are better for less electromagnetic interference, but this servo never caused such a problem for me(My receiver is mounted only 2-3cm away from two HXT900s ).In fact, I don't think a servo of this size would cause an interference even if it doesn't have a coreless motor because it does not draw too much power like the standard or bigger ones. I think the teflon bushing stands for the material servo case is made of, it provides enough support and good lubrication even with no grease.I did see in other brand servos of this size problems like up- down play in horn gear, less gear teeth surface contact(results in a weaker performance through crashes)HXT900 doesn't have such problems.And 25cm wire is better for mounting especially in wings where the servo is mounted far away from the receiver, you may cut and reconnect the wire if you like it shorter.The only negative side is the higher stall current, but I didn't see any problems with 4 of them installed without an external BEC(I use a towerpro 25A ESC with an onboard BEC of 1.5 amps).I think these servos are the best for the price.
   Dmitry (29%)
I mean, servos i've received was 100% identical to TG9e. They have same motor, same wire length. Compare photos of HXT900 and TG9e here on site. Their motors looks different. And what about description? Anyway these is perfect servos, but TG9e is better because of price (if they are identical, as i think).
   vfrjohn (60%)
** I have not disassembled one of mine, but I'm pretty sure they are NOT coreless motor, they do have 24-25cm wires, and if there is a bushing it is extremely well hidden! These look identical to my Turnigy TG9e's to me. ** vfrjohn
   TONY.ALVES (55%)
I received mine as you dercribled.
12/05/2010
Jolly Jumper (22%)
Is the connection (or plug) compatible with HK receivers?
   Waco (78%)
Yes, of course.
   speed freek (71%)
yes it is compatible with hk recevers infact they work very well with HK Rx.
   rc-france-mode (72%)
hello yes it s compatble *
   Alexandre (28%)
For sure, as the connection on these HK Rx is Futaba-style, you can plug HXT900 servos (which have JR plugs).
   Jolly Jumper (22%)
The HK Rx's have Futaba connections but the JR plugs on the HXT900 servo's also fit.
That's what I wanted to know, many thanks for the many replies!
   OBADEK (0%)
Yes this is compatible with HK Receivers
   Cliff (50%)
This servo has a generic connector. Now days all servos are compatible with all receivers. There are some really tiny servos and receivers for indoor electrics that sometimes have different connectors, and Futaba has some small oddball stuff with different connectors, but 99.5% of the stuff out there fits or can be made to fit by trimming the plug. The worst that can happen is if you get a Futaba servo and need to plug it into JR receiver. In that case you would need to trim the extra tab off the Futaba receiver and also trim two of the corners off for it to slide in. Basically they are the same with Futaba having extra plastic. Once you trim the extra plastic, a Futaba becomes a JR (or generic). The "generic RC parts" industry, and this servo in particular use the JR format which is sometimes called "universal" now. Some of these servos can be plugged in backwards now, but in all my years (35 in RC) I have never damaged a servo by plugging it in backwards, and I have probably done it a dozen times with various brands.
   robertx (16%)
Yes, with all recivers
   tomxl3 (25%)
yes most if not all servos have the same 3 wire plug on them just make sure to get the plug pluged in the right way so you ground wire is on the rite pin and signal too:)
   Boris (17%)
yes the connection is compatible with HK receivers?
I have a Hobby King 2.4Ghz 6Ch Tx & Rx and my plane fly with this servo.
   Pilot12345 (74%)
Yes it is
   mrkokes (0%)
Yep. Works great.
   jetspeeds (81%)
I think that you know that it works with HK recievers. All servos will have the same plug for recievers.
   liggo 76 (66%)
yes these plugs are compatible
   afanasjevs (23%)
Yes! Of course they are.
   nagyb (48%)
Yes it is
   matches12323 (24%)
Yes, it is compatible. It is the JR connector, not the Futaba. It should would with HK, Spektrum, and JR Receivers! -Tyler
   Norway93 (11%)
yes they are.
   kenshiro974 (62%)
yES it s compatible
   Helimaniacos (97%)
yes, compatible with all futaba/JR conections(including HK receivers)
   pimpmycnc (8%)
The plugs on these servos fit JR, Futaba etc.
   syryus (74%)
The plug is like Futabas so i think yes, but i don't have a HK receiver sorry *)
   Emilio (42%)
I have a futaba reciver 2.4 Ghz and it's compatibile!
   hotic (17%)
Yes it is compatible.
   RCWerner (29%)
The Connector is a standard JR/Robbe - Uni Connector. like them on Hitec Servos f.e.
   Liad-Zeev (24%)
regular size connectors, which mean yes.
   Ales (60%)
Yes it is compatibile with HK receivers, It is standard 3 wire servo plug, compatibile with alerady all receivers
   frostbit (68%)
Yes, keep brown wire to the outside of Rx as theair is no aliment key, if you do plug it in backwords it won't work but nothing was heart, at least not for me. Also if using HK 6 Rx when binding the blinking diod can not be seen from front or back of Rx. Look at side of Rx and diod is very visable. Good flying to you.
   chiroman21 (7%)
All servos have a standard plug, so yes it will fit
   Rick_BRZ_RJ_CG (16%)
Yes. This best servo is full compatible with HK receivers. I am used this a long time with all HK receivers.
   Emilio (42%)
It's compatibile with futaba recivers
   zhavoronkov (0%)
Yes, on receivers a standard socket futaba
   Aremon (25%)
Yes. It's used standart plug.
   Charles (15%)
Yes works with mine I use hk8 channel and thease same servo and works great.
   Joachim (12%)
Shure the most HK recievers are JR or Futaba
and this servo Pulg is JR. That means it fits..

MFG Jan
   enisso (13%)
Its same connector as FUTAMA, JR, atc
   sosimportacoes (79%)
yes guy, is compatible. connection. bye
   Aremon (25%)
yes...
   gerryman (98%)
without problems
   Beldin_33 (25%)
Correct.
   Amonster (9%)
i would assume so all the recievers ive had are all compatible
   RON (61%)
yes, i use them with my 4 chanmnel hobby king and 5 channel hobby king receivers.
   martial (8%)
verry nice litle servo noting to cumplain on this.
   angel1 (57%)
yes they sure are
   makis (18%)
it is compatible with any receiver... including HK..
   Almet_Evgeny (46%)
Full compatible with HK receivers!
   Willi (32%)
Hello Jolly,

The connector is the normal JR connector. I have
this servo's connected to the corona RX without any problems.

Kind regards
Willi
   avlisogeid (30%)
hello. this servo is absolutely compatible with all receivers. i have used it with:futaba,spektrum and HK receivers without problems. Diego
   avlisogeid (30%)
hello. the plug is compatible with all connector, i have tested it on futaba,spektrum, hitec and HK receivers. Diego
   Coyote64 (-31%)
Yes they are
   troll32 (32%)
yes of course...
   soebhemo (49%)
surely compatible mate !
   Graham Daniel (45%)
Yes, it's the standard plug.
   jesper (24%)
yes with all recievers
   brushlesspower (0%)
Yes, that is what I am using mine with.
   fordfm (39%)
The plug servo hxt900 is compatible with futaba type plugs
   Ray (59%)
yep sure is fits any receiver with the standard connectors
   weberschi (50%)
Totally compatible, im using in HK-T6a receiver for 6 months, good servo, no glitches or anything.
   troll32 (32%)
yes of course
   MONICA ALEJANDRA (48%)
yes, of course
   dhtfhftghf (29%)
yes it works for every thing
   damacan (15%)
yes it is compatible
   tommo85 (42%)
Yes, all servos and receivers have the same standardized design. The only variences are in Futaba style plugs have an extra tab. and use black red and white 3core flat cable. while JR/Hitec style uses Brown, Red, and Orange 3 core flat cable. they all work int he same manner by using pulse manipulation throught he signal wire, (white or orange) to tell the servo where to transit too. while the servo is constantly powered through the black/red or Brown/red wires.
   Yuriy (20%)
Yes, this micro servo also compatible with hobbyking and others recievers!
As for me, I connect these microservos (3 items) on my training plane Yak-54 (1 item of these micros to ailerons and 2 items to ruddle and elevator).
I think that very good servos for it's price!
   rustynail (17%)
the connector is a universal type with the positive Voltage pin in the center to make any mistakes in the connection non critical. Fits into JR, Futaba, Corona and-what-not receivers. I trust also on HK receivers from judging the product pictures.
   airezzz (35%)
certainly, just connect the signal side of the connector (white or orenge) in the side of the small "sockets".
   Tomer (50%)
It has a standard JR/Futaba connector.
   Inakto (36%)
yes, its a standard servo wire
   TONY.ALVES (55%)
Yes it does.
8/05/2010
Cole (69%)
These Are osme of the Best Servos I have ever used for its class.

Cheap, reliable, and they do as they are told.
Center well, and don't pull to many amps.
Great~
   Pier Luigi (8%)
perfectly agree with you, quality/price very good
   experienced (10%)
it is very very powerfull and fine
   JOSE ANTONIO (50%)
llevo comprado unos 10-12 servos para helicoptero y aviones electricos y la verdad que van muy bien, muy suaves y centran perfectos
   leolo (27%)
very good and very strong
   David (17%)
Best 9g servo for the money bar none.
   rcflyboynj (19%)
Work great for me too!
   chiroman21 (7%)
Don't forget in the event of a stripped gear replacements are under a dollar. All around best deal on a servo. :-)
   zukoko (10%)
Guter kleiner Servo Stellt sehr genau und schnell
   Amonster (9%)
best servos for the money they sell them in my lhs for 10x the $
   angel1 (57%)
agreed
   dhtfhftghf (29%)
yes these are the best
   Patrick (25%)
agree.. Nice and torquey for the size aswell >>
   TONY.ALVES (55%)
Never had any problem with them , used in my mini planes ( Gee Bee, Tutor , Mini Pulse XT )
   buffalochill (0%)
for that price they are ok.. I ordered 10 .. 3 of them were getting hot and didn't center so I only use these 3 as spareparts... the other 7 servos were ok
31/03/2010
Ednac (77%)
What screw fits the servo-arm hole? Dropped one of the screws and it disappeared.
   speed freek (71%)
I tapt all servo arms with small tap witch is the same as the ball link skrews on the HK 450 hellis and it works greate .
   VasilakisM (67%)
2mm in diameter and about 8mm long.
   Mitchell (10%)
I find the smallest screw fits my needs on the one-sided arm. If you are asking what type of thread/length for a replacement sorry I have no idea.
   Valter (68%)
Voce apertou muito e escorreu a rosca.
   Valter (68%)
Baaaaaaaaaaaaaaaaaaaaaaaaaaaa!!!!!!!
   pidjones (44%)
***********hobbycity****/hobbycity/store/uh_viewItem.asp?idProduct=8715
   Soren (17%)
Grab something and try. You'll find one that works. So what if it's not "factory".
   Ednac (77%)
Never thought of trying a screw to see if it fits...

Seriously though, 1.75 is too small for the HXT900 arm, it works fine for the 5g servo. I know they're cheap, but I hate to ditch it for want of a $0.05 screw!
   Letatel (92%)
Dimensions of thread: d2mm/5mm of long, ~0.8mm pitch
   tomxl3 (25%)
if you have a extra screw sitting around that fits the hole snugly use it should work fine!:)
   OBADEK (0%)
You can use one screw same size
   tomxl3 (25%)
use the screw that doesn't have a pan head or the odd one which is shorter than the others otherwise you will ruin your servo!
   pimpmycnc (8%)
Just take a similar screw of a similar servo. But pay attention about the length an the diameter.
   vaughan (52%)
Any screw from your toolbox that fits will do.
   Soren (17%)
Anything that fits and holds the arm in place.
   Aykut (23%)
I tried PT1.75 screws before , but they were a bit loose and didnt work.Then I found some short(5mm in length) 2mm diameter screws and although fitting a bit tight, they did the job.I think this is exactly what you're looking for : www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=8713&Product_Name=Self-Tapping_Screws_M2x4_(10pcs/set)
   KMart (63%)
FWIW, strong magnets help me find screws I drop in the carpet... :D
   weberschi (50%)
The package comes with 4 screws, for the servo arm use the smaller screw, if u lost the smaller one, use another even if the screw not reach the end, it will tight armenough to secure it in place.
Obs: i loose some screws here too :D
   dhtfhftghf (29%)
For $3 buy a new one
   vfrjohn (60%)
Ednac- I measure the screw at 2.16mm diameter 4.57mm long. So I would say "2mm x 4.5mm pan head phillips sheet metal screw". Or something like that... vfrjohn
2/03/2010
John USA & PHP (52%)
Since I reduced the length of the control arm a little on my Easy Glider, the gears are no longer breaking on landing. I do recommend purchasing extra gears when you buy these servos, because accidents do happen.
   Soren (17%)
Excellent idea, but don't buy a whole bunch. I've been using this servo as my go-to servo for a long time and have yet to strip any gears. I always seemed to manage to strip HiTec servo gears, but switching to HXT900 and even several crashes later the servos work fine. Highly recommended item.
   Marty (67%)
Oh, c'mon. At three and a half bucks apiece you just replace 'em. Eh?
   Terry (29%)
I find the control arms that come with these to be too thin for ball link assemblies. Dubro long servo arms for the GWS Naro are an exact fit. The output wheel of the Hextronik HXT900 servos has 20 splines
   Claudius (-33%)
don't put this one on the easy glider... invest a little more on servos.
   timebit (20%)
you can buy extra gears for this kind of servo... the cost is very less... so you can change it when something breaks... greetings...
1/03/2010
d1palm (0%)
What is everyone using to mount the servos in the HK450 v2 as it did not come with any plastic nuts?
Thanks for the help...
   r_g_r (90%)
Hey,
the HK450 kit comes with a lot of skrews. Unfortunately the different strews are not labeled, so you'll have to try which one might fit. I used some of the self-threading screws to mount the servos. Skrew them directly into the frame and apply some thread locker on the other side. But be aware some thread-locker might melt the servo's plastic case. So make sure to only apply the thread-locker on the skrew and don't let it make contact with the servo.

Greets
   madbuilder (56%)
My HK450 v2 came with ball links and matching machine screws! I had to enlarge the servo horn/arm hole slightly.
   Agonzalez (45%)
you can use a spare servo arm with the servo screws, this works very good. Cut the spline an you will hhe a flat surface to screw on!!
   pidjones (44%)
Cut a nylon wire tie into short pieces and drill holes in them. Makes a great servo mount nut!
   Soren (17%)
How about using ordinary nuts? Worked for me.
   tomxl3 (25%)
just go to you local hardware store and purchase some hex head bolts with a nylon thread locking nuts! they work perfect :)
   branflake12 (20%)
Not sure about the HK450...but they do not come with plastic nuts. just screws and horns.
   Joachim (12%)
ive us the screws who are in the package at the HK450V2 because there are much more screws then u need.
   Barndog (17%)
Just glue it in.
12/02/2010
padrinodlg (50%)
I sand the hk-450 frame. Only with a cutter is enough. you have to sand less than 0.5 mm.
Good luck!
   Beeetle (0%)
Thank you for your answer JACOBO. I'll try.
   Shea (24%)
no need to sand the frame if you loosten hex screws on frame you can slide them right in the top part of the servo fits in the frame just not the bottom, would be a shame to sand it and have gaps if you upgrade servos.. although a new kit and new servos is not that much more expensive
11/02/2010
Beeetle (0%)
How do I put them in the HK450? Mine are too big, their D (see Product Config Table) is more than 12.5mm. They jam at their biggest part. I removed the labels, but they still don't fit :(

Do you sand them, or how do you put them in the HK450 frame?

Or has the batch (of which my HK450 (V.1) comes from) too small openings?

PS: Sorry for my bad English
   r_g_r (90%)
Hi!

This video might help:
http://www youtube com/watch?v=VOgjgjyBur4
Note: Put a dot instead of the blanks before and after "youtube"

Greets!
   andsti (50%)
Try to file down the frame and it will fit
   kabuto (12%)
http://www.youtube.com/watch?v=_I54cO0uLKs&feature=PlayList&p=8D005CB69FB0F5A9&playnext_from=PL&playnext=1&index=1

try this video
   Andreas (52%)
Just cut some small pieces off your frame and the servos will fit. I did the same. A very thin piece is enough.
   tomxl3 (25%)
you have too split the frame and use the top of the servo and stick it through the hole don't use the bottom through the hole because it is bigger in size than the top! hope this helps:)
   mbor1 (0%)
Put them from inside. And you don't need to sand the frame.
   komnata507 (15%)
I excuse
   vaughan (52%)
Cut away some of your HK 450 to make them fit or get smaller servos.
   stretch81 (10%)
Split your frames(or loosen the screws a little and if you hold youre toung just right they will slip in from the INSIDE )Much easer than sanding the frame
   TeeJayShelton (9%)
They go from the inside out. You put them inside the frame and poke the front of the frame. It actually requires taking the bird apart a little to do it.
   angel1 (57%)
Hello, Sand the servo case or file the heli.They almost fit but are a little large. If you take the frame apart you can put them in with no sanding but is a pain.
   Coyote64 (-31%)
To fit them as with hs65mg`s you need to sand the frame not the servo to give them enough space to fit *)
6/02/2010
OBADEK (0%)
good servo motors for little money, I always park in any flayers. Highly recommend, good quality for low price!
   Bob1 (24%)
Would you know if they would work as a tail servo as well?
   Letatel (92%)
Yes, super servo!!!
   OBADEK (0%)
I agree, I use them in many models, but I'm always pleased to warmly recommend buying for so little money profits max quality.
   Joachim (12%)
Thats correct. U can use theme is all cind of foam planes an small helicoters.
they are really fast an strong love theme ^^

MFg Jan
   Shea (24%)
it holds my hk450 after a lot of adjusting?? i trust it enough a little wander but no full osculations just a 15degree kick to one side on hard throttle pumps
3/02/2010
Flhyr (0%)
Can someone tell me which color wire is /-/Signal? I don't want to plug it in backwards and wreck it.
thanks,
   padrinodlg (50%)
brown - ground
red + vcc
yellow signal
   kinkonraf (76%)
White wire is Signal. Red is Batt and black is -Batt. Also are Orange, Red, Brown, in the same order.
   radialarm (14%)
white or orange = signal
red = positive
black or brown = negative
   Dan (29%)
The signal wire is Orange. " " is Red "-" is Brown
   Dmitrii (0%)
brown wire = (-) red wire = ( ) yellow wire = sinal wire
   Letatel (92%)
brown - "-"* red - " "* yellow - "signal wire"
   tomxl3 (25%)
the orange is signal and middle red is and brown is - ground hope it helps:)
   Alexandre (28%)
It's a JR-style plug : Orange (Signal), Red ( ) and Black (-).
   OBADEK (0%)
The warning behind the yellow color, brown is negative and positive nobody
   tomxl3 (25%)
the orange one is signal!
   matches12323 (24%)
- is the brown/black wire. Now they make them so the is in the middle and the - and neutral are on the outsides so that you don't fry anything. -Tyler
   kenshiro974 (62%)
signal is orange
   David (23%)
Normally the -ve wire is brown and the signal wire is orange. I've plugged these in backwards, and it hasn't damaged them yet. If it doesn't work, I just flip it around.
   Waco (78%)
Generally on Futaba servo leads is "-" wire black, on JR servo leads is "-" wire brown and they are always outside. This servo use JR type servo lead.
   giozard (24%)
i think is: orange(signal)/red( )/brown(-), but theres no problem if you plug it backwards, because ( ) is in the middle so you wont break it if it is backwards, just it is not going to work until you plug it right.
   vaughan (52%)
Plugging in back to front won't wreck it, it just won't work.
   moskona (6%)
Hi, signal wire is orange colour. Red is positive and black is negative.
More info on ***********fatlion****/sailplanes/servos.html
   Pons (0%)
the is red the - is black and the signal is yellow or orange they're in this order : signal/ /- Good flights Elie
   Joachim (12%)
the yellow one is the signal cable.
the red ones is
the black one is -

MFg Jan
   enisso (13%)
red is " ", black or brown is "-" and white or yellow is "signal" on every servos
   RON (61%)
plugging backwards won't wreck it, as power wire is middle wire. it just won't work if plugged in backwards. i've done it several times through the years. i beleive orange is signal, brown is ground.
   angel1 (57%)
orange
   Coyote64 (-31%)
Orange is signal wire red ve brown -ve
   freddan_6 (87%)
Red= , White=signal, Black=ground. If you plug it in backwards nothing happens.
   Ismoly (36%)
Black!!!
   henrique.pgs (25%)
Is the darker one. Dont worrie! If you plug it in other position the servo will NOT burn, it only will not work, but if you reverse it will work.
12/01/2010
qwertM3 (17%)
It is possible to be safe with this servos. My check list is:
-centering,
-consistence of centering,
-end to end movement,
-smouth movement ( no bindings in gears ),
-jittering.
I do it for a new servos and after the crash.
Wish you all the best.
   Joxson (64%)
Hi! This servo is just as the Hitec HS-55! But bigger gears! I love those, go for it!!
   radialarm (14%)
This servo is one of their best sellers. A lot of guys swear by them.
   Letatel (92%)
thanks. it really GOOD servo.
   tomxl3 (25%)
these servos are the best servo ive seen on the market in a while and are great at centering and smooth movement and NO!!!!! jittering at all! also a full range movement too end to end:)
   Coyote64 (-31%)
So far ive had no issues with the HXT900`s they arnt hs65mg`s by any means but for the price they center well, dont jitter and i dont get any binding. The gears strip easy but so do most plastics
   Barndog (17%)
These are excellent servos. I have used them in many foamys and they survive crashes well, center well and have good speed and torque. Gears to do not seem to strip easily. Highly reccomended!!
   davi (10%)
Buddy for this price you wont find better servos. I use lot`s of them and i lost just one by my bad behavior.
1/01/2010
ckies (60%)
A quick confession (and warning to others perhaps) - in the servo packet you receive the servo, servo horns and three screws, a shortish one and two longer ones. Do NOT use the longer screw to secure the servo horn - it destroys the servo!!! In hind sight I realized that the longer screws are intended for mounting the servo - unfortunately a bit too late after killing 4 of these guys!
   Letatel (92%)
very stupidly...
   Fly_Fast (0%)
...and also don't eat the servo ! It could be dangerous of course...
30/11/2009
scterry (6%)
Would it be safe to run 4 of these servos on a 2A BEC? (Turnigy basic 18A ECS). I will be using 2 for the alerions, 1 for the rudder and 1 for the elevator on a 500g slow flying park flyer.I noticed the high stall currents (690mA) stated in the reviews which would exceed the 2A limit if all 4 servos were stalled. I am new to flying and am not sure if you would ever encounter this type of stall condition. Under normal flying conditions and hard reversals they draw 160mA to 290mA which would be just fine for the 2A BEC. Would I require a 3A BEC like the Hobbyking SS 25-30A ECS? Thank you for helping me choose the right ECS for these servos.
   stgram12 (48%)
Well in my measures those servos reached stall currents of 0.5A, but if for milliseconds they go higher, you might experience some problems, especially if the ESC is very cheap.
Try it like that, because there is no need for more current-rated BEC. But if there are blackouts, put one big capacitor to compensate for the burst currents.
   Eric1180 (10%)
Also you ESC will just get hotter if you go over 2A it won't instantly fry at that level. in your case don't worry about it unless you ESC starts getting REALLY HOT. One more thing .. i would imaging it's pretty hard to stall all of the servos at once in a 500g airplane.
   kinkonraf (76%)
I have been flying with up to 7 of this servos and two Amps. BECs without a problem, models of 700 to 1200g.
   udogigahertz (17%)
My advice: Better be on the safe side and take the bigger, more powerful BEC. It is always better to have a reserve and not need it, as to have no reserve and you need it ..... in that case your plane will most likely crash.
Udo
   gerryman (98%)
without problems
   RON (61%)
i use 4 on 3d planes w/ 2a bec a lot, no issues. just make sure your linkages don't bind or make the servo "grind".
   Barndog (17%)
2A will work fine on park flyer
31/10/2009
Gunky (29%)
What are the 3 screws that come with it for? Two are the same size, one is smaller. The servo has 4 holes for mounting though.
   Andraz (20%)
the servo has two mounting holes not 4, so the bigger screws ate for that, the smaler is to hold down the servo arm :D
   Gunky (29%)
thanks!
   udogigahertz (17%)
The smaller one is for mounting the servo-horn, the two bigger ones are for mounting the servo itself (2 are enough for this little servo).

Udo
   OBADEK (0%)
Two more screws are for mounting the servomotor, a small screw to attach the leg servomotor, where you put those plastic wire materials.
   dutchspider9 (25%)
the 2 large screws are for screwing the servo in your model (you've to put the screws trough the 2 clips on each side of the servo) the little screw is to set the control horn on the servo
   moskona (6%)
Smaller screw is for securing horns, longer screws are used for fixing servo to servo location.
   stretch81 (10%)
the two longer ones are for securing the servo the short one is for the servo arm
   Barracudaafly (10%)
The shortest screw is for the servo horn, the others ... I don't know. DON'T USE THE LONGER SCREWS FOR THE HORNS! You will damage the servo.
   gerryman (98%)
the two idems are for mounting the servo, the other is to put in the head of the servo to fix the arm
   benjamin (17%)
the smaller screw is to fix the servo arm. the other 2 for fixing servos on the frame...
   davi (10%)
The smaller one you use to fix the arm. The other two you use to fix the servo in the place you want.
22/10/2009
BOSS8 (68%)

This is the best servo for a good price for small models. I have 15 pieces in operation for more than one year, all work without problems.
17/10/2009
bdoets (87%)
Wouldn't it be nice if these (or any other budget servo) would run on 7.4 V?
Using a 2S lipo in a glider would be so practical.
   stgram12 (48%)
All the servos are made for 4.8 to 6 volts, so they can be controlled by the receiver, which works on the same voltage range. And so one BEC, probably in the ESC powers everything.
   Eric1180 (10%)
The only High Voltage servos out there are going to cost a **** more then $3
   RON (61%)
i run 7.4 in my glow planes and use one of these ***********unitedhobbies****/unitedhobbies/store/uh_viewItem.asp?idProduct=3735&Product_Name=HXT_UBEC_5/6v_output,_5.5~23v_Input to regulate voltage.
10/10/2009
maukabud (60%)
Hextronik listened to us and made the servo wires longer. I always add a pair onto my orders- the latest order (10-09) servos wires are nearly three inches longer than previous. Nice.
   stgram12 (48%)
I'm glad that they are 8 centimeters longer now, because they were quite short(about 15cm).
I would suggest even that HC adds one servo lead extender(15cm) to the servo free, so if you use it in a car, to use it like that, and if you place it in a plane, to use the additional lead if it is not enough.
22/08/2009
Dildo (59%)
In the UK there are several of us that have had these servo's just die in the air for no reason. I know their cheap but after one repair bill you'll regret buying these servo's. There is no quality control so you don't KNOW what your going to get.
   ministeve2003 (83%)
Strange, I've used over 100pc, and never have I had one go bad in the air... and I've torked these little things to their limit's and past...
   stgram12 (48%)
Maybe a bad batch, because really there are tons of reports for working servos...
Actually i had a problem too, the servo didn't responded at all, but i got it apart few times and it worked. :)
10/08/2009
Makseem (55%)
These are great for the esky honey bee and belt cp models. Huge improvement over stock servos. Way less slop!
5/08/2009
Richard_s (68%)
Hi. what BEC I need for 6 of this servos? Will 3A be sufficient? I plan to buy SS 25-30A speed controller... Thanks.
   stgram12 (48%)
I suggest that 3A could do the work, but if you use all 6 servos at once with fast movements its 99% sure that the rx will restart, because these servos can draw stall currents more that 0.5A,on my measures it reached almost that current.
I suggest that you put one powerful capacitor to compensate those stall currents. But if the BEC is quality made, it probably would handle more current than stated for few seconds...
   tkupcik (71%)
For 6 of this servos You cant use linear Bec. I recommend to choose speed controller with switching bec (for example Mystery 40A) or You can buy SS 25-30A and external 3A UBEC for Rx and servos.
   dutchspider9 (25%)
That depends on what kind of model you are flying. A 3d model will use more A then a Glider does. i suppose a 3A will be sufficient
2/08/2009
stgram12 (48%)
I yesterday received my first servo, but i have a problem. After powering the rx and the ESC the servo moves a little bit and doesn't responds to any commands! I have to reset the power so it moves a little but again not responding later. The servo is with no load, the problem is not in the rx. The wires are orange,red,brown. I suppose my rx uses the futaba type of servo conectors. white,red black. But they are the same!
Help me please!
   stgram12 (48%)
I forgot to say that it fixed itself, maybe a bad connection. A opened it 3-4 times and it was all right!
21/06/2009
Daveb50 (65%)
WARNING
These servos can be found on eBay and other asian sellers at close to this price, however be warned, they do not contain Taiwan/Japan components. HexTronik (the manufacturers of these servos) have two standards, one is for local sale, and the other is export quality with imported connectors and resin gears from Taiwan and Japan.
Our HXT500 and HXT900 are export only, and not built for the domestic market.
Looks like HC decided to sell the not so good clones- under the Turnigy name. LOL.
6/06/2009
valentinortu (90%)
bastante buenos, yo los utilizo en aviones de depron creados por mi y os aseguro quelos fuerzo bastante, aguantan mui bien
   Nobis (79%)
Ein tolles Servo um einen Super-Preis. Zu empfehlen
9/05/2009
shah123 (86%)
Here is a dumb question (I am a newbie): Would this work with 2s 7.4v lipo? The voltage rating is 3 to 6v in the specs above.
   Kendall (83%)
There are no dumb questions. The servos are powered off the receiver. In an electric application the ESC (specifically the battery eliminator circuit, or BEC, portion of it) steps the voltage down to ~5V to power the receiver and servos. As a receiver battery in a high voltage electric or fuel plane a 2s lipo will need a standalone BEC to step the voltage down.
   shah123 (86%)
Ok, great. I thought the voltage from the battery is directly wired into voltage terminals of each and every servo output of a receiver. But now I know that it is not a passive internal connection, instead it actively steps down the voltage. Thanks.
   Sergio (90%)
Yes, this servos work with 2s voltage.
   Eric1180 (10%)
No!!! it only works with a 2s after running through a BEC and dropping down to 4.8v or 6v 4.8v would make the servo last longer verse 6v but for $3 who care
   Mitchell (10%)
Actually this is not a stupid question, I had this question when I
started. It will work under "normal" circumstances, normal being that
you are not hooking up the servo straight from the battery. Ideally, this servo is
hooked up through a receiver (I assume). That is powered by either a receiver battery (which are in the 3-6v range) or a BEC. a BEC is a battery eliminator circuit. Usually "American" ESC's have these built in. Your other option is to use an external BEC, check out the one made by Castle Creations ("American", just google "Castle Creations BEC". you probably don't need the pro version.) What a BEC does is drops down the voltage to a servo-usable level. It is connected by a Y harness to the battery, with the other half going to your electronic speed controller. The BEC then plugs into the "batt" port on the receiver. I actually run a 3s (11.1v) lipo with this servo through an internal (built into ESC) BEC, it works great for my ailerons! Just to sum it up in simpler terms, if your only battery is connected to the ESC or you are using a receiver battery then yes it will work. The only way it will blow it up is if you have no other electronics and hook up the servo directly to the battery. Hope this helps you out!
   bgjbrok (50%)
I just fried 2 servos with a 5-cell (freshly charged enelooop) battery. Remember: just charged cells do have a little higer voltage and with the increasement of voltage the current will also increase. If the servo is loaded current may exceed specifications if more than 6 volts is used.
3/05/2009
Steve (38%)
Has anyone had an issue with these servos failing to travel completely on a Spektrum 6100 RX?. I had checked these with servo tester on the bench and was getting about 60 degree travel. When installed and connected to AR6100 am only getting about 30-40 degree travel. Dual rates and travel adjust on DX6i RX are set for 100% and 125%, respectively. There's NO binding in linkages or control surfaces.
   Majklus (47%)
It is normal for Spectrum radios that servos have with them a smaller range of movement. For bigger range you can set mix on your transmitter. For example mix rudder to rudder, elevator to elevator,…
   Steve (38%)
Michal - Using the MIX function on the DX6i really helped increase throws!!! THANK YOU!!!!!!!!!!!
   ministeve2003 (83%)
you must be using the dx6i, I've noticed that the throws were very small on it... alot smaller than my JR9303
   tommibarth (54%)
my servos only travel that 35-50 degrees but all servos are different.
26/04/2009
jeff (55%)
In the above description why do they state "Our HXT500 and HXT900 are export only, and not built for the domestic market". Are they not for U.S. sale? I like all the feed back about the quality but cant understand why they say not for the domestic market. Any comments?
   Beaufighter (25%)
Because this is a Hongkong site? And then the domestic market is China. (Not everything on the net is from USA:)

John USA & PHP (52%)
Replacement gears for HTX900 servos?

Bought 4 servos. all centered well and had the rated torque.

Replaced two HS-55 servos on the ailerons of my Easyglider electric because they were worn out and not centering well after 116 flights. The two HTX900 servos had gear failure after 12 flights.

I am now trying the second set of servos with the same control geometry and a 30% reduced servo arm length. Time will tell if these servos are up to the task.

MadMartigan (90%)
Vid of me testing the HXT900 servo as a tail servo on a HK450 Heli.
   OBADEK (0%)
good servo motors for little money, I always park in any flayers. Highly recommend, good quality for low price!
   Volodymyr (100%)
Realy good, budget servo!

slumberjer (90%)
If hxt see this discussion please make your servo wire a little bit longer..it's way too short..
   electrafly (83%)
This will fix your problem( ***********hobbycity****/hobbycity/store/uh_viewItem.asp?idProduct=5594&Product_Name=10CM_Servo_Lead_(Futaba)_32AWG_Ultra_Light )

Felar Furlong (85%)
real size is 22 x 12.5 x 22.7

Flyextreme (92%)
Use the GWS Park HPX on your tail (found here on HC)it's very fast, and about $12.I think I got one bad servo (900)but like you said...it's an extra gear set.

6thfloor (89%)
Well it had to happen, I just realized that at least one of my hxt900 servos is bad. Not upset at all. Simply took the gears out and put them into the one I had recked the day before. The bad servo would twitch around hover. I am not certain that the servo was bad but the problem is not happening now. By the way I recked 5 times before I finally stripped a gear. These servos are great.

6thfloor (89%)
Thanks Bill, and I will try it.
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