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BMS-385DMAX Digital Servo (Metal Gear) 4.2kg / .15sec / 16.5g

BMS-385DMAX Digital Servo (Metal Gear) 4.2kg / .15sec / 16.5g

BMS-385DMAX Digital Servo (Metal Gear) 4.2kg / .15sec / 16.5g
This servo is designed to be used in R/C glider applications. By using carbon nylon gears and optimizing the curvature of the gears, the gears are able to withstand large amounts of force.
The servo will automatically learn the users transmitter pulse timings and lock into the signal every time. The servo also includes a signal buffer in the CPU with fail-safe functionality.
The servo comes with an accessory package and the universal JR/Hitec "S" Connector which is physically and electrically compatible with all major receiver brands sold worldwide.
1. M9.6 ball bearing (si-oil)
2. Extra Strong torque with low signal affect and success get CE certification.
3. Rubber seals for waterproof case
4. Designed to be used in R/C glider applications.
5. Futaba compatible 25-tooth aluminum 6061 output splines
6. Digital motor drive with ultra-square PWM signal
7. Automatic determination of servo center pulse width
8. Metal gears of aluminum 6061 material combined with light and strong C95 material
9. Fail-Safe function
10. Digital control IC - SOP package with 12bit data transfer
11. MOS-FET motor driver chips that can handle 7A peak loads
12. Useable on 6.0V
Weight: 16.5grams / 0.59oz
Dimensions: 26 x 13 x 26 mm / 1.16 x 0.51 x 1.02 inch
Torque At 4.8V: 4.2kg/cm , 57 oz/in
Torque At 6.0V: 4.7kg/cm , 62 oz/in
Speed At 4.8V: 0.15sec / 60 deg at no load
Speed At 6.0V: 0.13sec / 60 deg at no load


Weight (g) 16.5
Torque (kg) 4.7
Speed(Sec/60deg) 0.13
A(mm) 37
B(mm) 27
C(mm) 31.5
D(mm) 13
E(mm) 36
F(mm) 20
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Customer Data

Weight: 38g
International Warehouse
Price  HKD159.08

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

    Combo Price: HKD7.76   IN STOCK

Further discounts available for registered & logged-in customers.
 Customer rated
Total of 37 discussions.
Barbe  1 points - 10/10/2014
the item that i received is defective....
Jason  1 points - 8/9/2014
Can anyone tell me the distance between the center of the arm attachment post and the short side of the servo? I'm trying to design a tricopter gymbol and I need that measurement. Thank you
Noah  2 points - 7/29/2014
Deplacement gears here: PRODUCT ID: BMS-20315
Tore  2 points - 6/26/2014
Be ware: one of the gears inside is plastic. The so called "metal gear" is not so metal gear after all...
 Roberto 27 points
i just found that out today:( any way to get replacement gears?
cmavr8  37 points - 6/22/2014
Has anyone found replacement for the bearing? 6mm inner diameter 9mm outer 2mm height
Customer Reviews
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Overall Rating
74 thumbs up!
Bought three of these and two of them make a "flying beatle" noise at centered position and without any Tx input. It is not a high volume noise but I never experienced this before. I bought lots of servos, both analogic and digital and surely these ones (66pcnt !) are NOT OK. I am not confident about them and I will not risk a plane with these servos.

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Overall Rating
44 thumbs up!
I bought 1 and it showed up DOA, the gears were completly jammed in it. Sent it back 40 days ago and haven't received anykind of response from hobby king yet. Giving it 3 stars for the fit and finish but I never got to test it so I can't do a 5 star rating.

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Overall Rating
17 thumbs up!
The auto-centering of these servos is terrible. They cannot find the Center and so they hunt and make a high pitch buzzing noise. I do not trust these in my glider and so will throw them in the bin. Waste of time and money if you buy these servos.

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Overall Rating
16 thumbs up!
I bought 2 of those, 1 was burned during third flight, plane was almost crashed, second one I put to the trash for prevention. Don't recomend to buy.

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Overall Rating
16 thumbs up!
J'ai command 4 servos et il crame les un aprs les autres je vais les changer avant le premier vol! Je pensais mettre un peu plus cher et en avoir des meilleurs et c'est faux!:( Premire fois que je suis du du matos de HK

I ordered 4 servos and it burns one after the others I am going to change them before the first flight! I thought spend more money for having best quality and it's wrong!:(First time when I am disappointed by HK product

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