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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.


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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  • HKS9257 - Replacement Gear Set

    Combo Price: $0.87   BACKORDER
    Add to Cart

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

    Combo Price: $1.00   IN STOCK
    Add to Cart

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 Customer rated
Total of 86 discussions.
miket65  38 points - 9/28/2016
why not the metal gear item ??
 meadowhay 1287 points
Hi Mike. I don't know why HK opted for the plastic geared version, but they do have some advantages over metal geared servos* most notably because of the reduced backlash in the geartrain allowed by plastic gears. That's the reason that a lot of aerobatic flyers opt for plastic over metal.
DeeBee123  10 points - 7/7/2015
This is a good tail servo for a 450 or 500 heli, I prefer the metal gear version but if set up correctly th this one will last for quite some time. Mine is still going strong after a year on a stretch 450. The key is to set your gyro of Fbl correctly this servo uses a 1520us center and 80mhz refresh frequency which is just above the 50mhz rate used for analog servos. If you run this servo at 233 or 333mhz refresh rate it will last maybe 10mins before burning out the driver chip rendering it useless.
Shayne  2 points - 12/28/2014
Hi. Could anyone please tell me what settings I should use in my ZYX S2 for a HKS-9257 servo? Using it for the tail on 450. Thanks
steven  4 points - 8/21/2014
Will this servo work OK with the GA 250 mini mems gyro ? I have the gyro and I'm looking for a tail servo for a 500 CMT
 WTWUK 3894 points
Yes. No problem. Works well with the GA-250 for anything up to sports flying. If you are going 3D, you will need higher spec servo and gyro really. Make sure you run it at 5volts and 1520us for longevity!!
 Andreas 10 points
Set servotype to 1520 μ*s / 70 Hz (it's default* five red flashes), otherwise you will burn your servo!
CopterLover  16 points - 8/4/2014
I have this servo in tail at HK-500 dfc. With V-bar. So does not work well. What type of servo this is? 333mhz or something else? there is three options to choose.
 WTWUK 3894 points
1520us 200hz and 5volts max.
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.

7 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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