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HKS-9257 High Speed Servo 4.5kg/ 25g/ 0.07sec

HKS-9257 High Speed Servo 4.5kg/ 25g/ 0.07sec

HKS-9257 is a high speed, high torque digital servo, Suitable for HK500/Align Trex-500 size Helis.

Dead band: 0.002ms (Default)
Control System: +Pulse Width Control
Working frequence: 1520μs / 80hz Digital mode/Analogy mode
(RX) Required Pulse: 3.0~5.0 Volt Peak to Peak Square Wave
Operating Voltage: 4.8~6.0 Volts DC
Operating Temperature Range: -10 to + 60 Degree C
Operating Speed (4.8V): 0.08 sec/60° degrees at no load
Operating Speed (6.0V): 0.07 sec/60° degrees at no load
Stall Torque (4.8V): 3.8
Stall Torque (6.0V): 4.2
360° Modifiable: NO
Motor Type: Coreless Motor
Potentiometer Drive: Indirect Drive
Driver Type: FET
Bearing Type: Dual Ball Bearings
Gear Type: Plastic gear
Programmable: YES
Connector Wire Length: 18.0 
Dimensions: 36x15.3x21.8 mm
Weight: 25 g

Equipped with two ball bearings.
For use with the Futaba GY401 (FUTM0807, FUTM0808) and the GY502 gyros.
Does not work with these Futaba radios (4FG, 5FG/K, 6FG, 6FG/K, 7FG/K New Terratop, 3EGX, 3PGE, 2NL, 2LGX, 2FR, 2PK series) These radios have a servo neutral signal of 1310us not compatible with this servo.
Do not use with AM radios.


This product available from a warehouse near you!

Weight (g) 25
Torque (kg) 4.5
Speed(Sec/60deg) 0.07
A(mm) 33
B(mm) 36
C(mm) 30
D(mm) 15
E(mm) 49
F(mm) 20
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Customer Data

Weight: 43g Quantity: 
United States Warehouse In Stock View Item

  • HKS9257 - Replacement Gear Set

    Combo Price: $0.87   IN STOCK

  • Futaba/JR Connector caps (5pcs/set)

    Combo Price: $1.00   IN STOCK

Further discounts available for registered & logged-in customers.
 Customer rated
Total of 80 discussions.
SkaterNatty  6 points - 4/27/2014
FYI - These servo's work with the ZYX-S2, I use it on my tail
 RoBo_Guy 320 points
yea... I recently started using these with the ZYX-S2... they work awesome! :-D
RoBo_Guy  320 points - 4/19/2014
Hi, I know it says that these servos are for HK-500, but I bought these by mistake for my HK-450TT PRO V2. Has anyone tried these with HK-450? Do they fit? Or is there some modifications that I can do to make them fit?
 helivader 89 points
I used it for my HK-450TT PRO as well. No modification required. It works well too.
 NaSiRaAgAd 35 points
for rudder only it works great.......
CopterLover  12 points - 4/7/2014
Is this good servo to HK-500 with tarot ZYX-s. To tail servo?? I think it should be when I look at the numbers
 Rob 6 points
I am using it as Tail Server with Tarot ZYX-S for past few months in HK-500. No problems so far. I am a Park Flyer only.
 Rob 6 points
 dcb103 9 points
as long as you don't put it on 6V ,it will last longer
Guntars  4 points - 3/22/2014
Hi, quick question, will this servo work if i plug it into FrSky V8FR-II receiver? Or do I need a special controller to control this GOTEC 9257?
Nirgal4  19 points - 3/20/2014
Hi, Would this servo work with a Futaba gy 401 on digital mode? Thanks.
 nelio 6 points
trabalaha sim , em modo digita , mais coloque no maximo 4,5v ate 5,v nao coloque em 6v ou queima
Customer Reviews
Overall Rating
6 thumbs up!
Bought this servo for my trex 450 pro which I fly a lot.
It work fine BUT...

After about 10 hours of flying the servo died during flight. I was lucky to be half meter from ground and avoided crash.

I do not recommend this servo. It dies after short time.

Does anyone knows if the futaba 9257 live longer?

14 comments. Reply..

Overall Rating
5 thumbs up!
Bought this digital servo labeled GS-D9257 GOTECK. Specs allow 6v so tested under 6v with HK-401b.
Tested on a HK-500CMT electronically & mechanically set up perfectly. Heli itself, flies with no abnormal vibration.
In the Initial test, the tail does not well, got some side to side slide.
Servo died electronically after 4 minute test flight.(Gears good, receiving power, reacts when physically moved but dead to any command from receiver and/or gyro.
(2 other reviews stated the same problem)
This is the second servo (same type) that has died after a few minutes of test flight using a second HK-401b. (Please know that some HK-401b gyros need components to be secured inside case with glue which has been addressed for this test)

A lot of reviews state this combo works well,
perhaps their system is running on 5v.

Will examine the anomalies between the good reviews and bad reviews to determine why with some folks this combo works well others the same exact combo does not.....or perhaps some reviews are not true.

Will put on the bench for analysis.
Possible suspected problems for now:
-Servo designed for 5v and burns on 6v although specs allow 6v
-Gyro frequency on DS "Digital Servo" to high for this servo.

Will post again after bench testing and substitution method to trouble shoot the problem.
Any other tests/comments are welcome, please reply.

12 comments. Reply..

Overall Rating
4 thumbs up!
Fast, precise and smooth at first glance. Used as tail servo on HK401b gyro at 6.0 volt on HK450pro Belt. The first couple of flights it was fine, but then I got a slight tail wag. Turned down the gain and it was fine again. Then, after only 10 flights or so, it broke mid flight. Tail going randomly from left to right. Tried to auto it , but failed. After inspection I saw the gears are still good , but the servo did not move at all. As I did buy two, I will give it another try to see if the first one was just a dud or if they systematically fail under these circumstances. Will report back after testing it.

6 comments. Reply..

Overall Rating
4 thumbs up!
put one of this servo on my gt500 tail, after 3 flight it dead in the air, but my gt500 only die when it hit the ground. so i think i will get a futaba next time.

No comments. Reply..

Overall Rating
3 thumbs up!
I have 2 of them.Hk 401 gyro on blade 400.After 20 sport flying the servo died.I was going for landing so i save it. For hover is perfect but more ..... .Finally you got what you pa

1 comment. Reply.. here to see all reviews
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