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ProTek RC 155S Digital "High Speed" Metal Gear Servo (High Voltage/Metal Case)

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This is the ProTek R/C 155S Digital Hi-Speed Metal Gear High Voltage Servo. ProTek R/C Servos have been developed to provide enthusiasts with high quality servo's that will exceed expectations at every level. With features that meet or surpass what the competition can provide, ProTek R/C servos deliver performance and unmatched value, with industry leading customer support.

The ProTek R/C 155S High Voltage Hi-Speed servo delivers lighting fast 0.08 transit speed and 308 oz-in of torque at 6.0V, and when you bump the voltage to 7.4 the spec's increase to 0.06 and 370 oz-in! Spec's like these make this servo an excellent choice for any 1/10 to 1/8 scale vehicle application. Other features include a full aluminum case that provides bomb proof durability and improved heat dissipation, a metal gear train that is supported by dual ball bearings, a 200mm long 22awg connector wire with gold plated connectors, a coreless motor and a Conformal Coated circuit boad. 

Plus, instead of a cheap plastic servo horn, ProTek R/C goes the extra mile with an included aluminum single arm servo horn that will stand up to a majority of the punishment you can throw at it. Stop wasting your money on budget servos that look good in the spec list, but fall short when its time to perform. Get ProTek and don't look back.

Conformal Coated Circuit Board
The ProTek R/C 155 series is the first to introduce the use of a Conformal Coating: a thin layer of polymeric film that contours to the printed circuit board to protect against vibrations, moisture, dust, chemicals and extreme temperatures. With the application of Conformal Coating, the 155 series is ready for battle.

Warning! This ProTek R/C servo requires that you use a m3x10mm screw to attach the servo horn to the output shaft. If you choose to use another screw, be sure to use a 10mm length screw. Use of a shorter screw can cause failure and will void your warranty.



  • Ideal for any 1/10 to 1/8 scale vehicle application
  • Conformal coated circuit board
  • Full aluminum case
  • High voltage circuitry
  • 0.08 transit speed, and 308 oz-in of torque @ 6.0V
  • 0.06 transit speed, and 370 oz-in of torque @ 7.4V
  • Aluminum single arm servo horn
  • Full metal gears and dual ball bearings
  • 200mm long 22awg connector wire w/gold plated connectors
  • Coreless motor

Servo Model
Recommended Application 1/10 to 1/8 scale surface
Operating Voltage 4.8V - 7.4V
Operating Temperature 14° to 140° F (-10 to +60° C)
Operating Speed @ 6.0V 0.08/60° sec
Operating Speed @ 7.4V
0.06/60° sec
Dynamic Torque @ 6.0V
308 oz-in (21.1 kg-cm)
Dynamic Torque @ 7.4V
370 oz-in (26.6 kg-cm)
Motor Type
High Efficiency Coreless Motor
Output Shaft 25 Tooth
Gears Metal
Weight 72.9g
1520μs / 333hz


This product was added to our catalog on June 4, 2018

Verified Owner
Thursday, Oct 24 2019 (7 weeks ago)
ProTek RC 155S Digital "High Speed" Metal Gear Servo (High Voltage/Metal Case)
I have had good experiences with ProTek products so I gave this servo a try. It was a great servo and provided me enough torque and speed to steer my 1/8 nitro on road car.
There was an instance where the servo was not performing properly so I had to remove it and send it to Amain to have it diagnosed. They did diagnostics on it and could not
duplicate what I had experienced. But Amain being the company that I've known them to be, sent me a new replacement without hesitation. I was so happy with the performance
of the servo and the customer service of Amain, and decided to order (3) more of their servos to power both 1/8 nitro on road cars that I own.
Verified Owner
Wednesday, Aug 7 2019 (4 months ago)
ProTek RC 155S Digital "High Speed" Metal Gear Servo (High Voltage/Metal Case)
I’m still in awww that I’ve never had a problem. Love the service. Can’t be anymore stand up than Amain!!!!! Thanks
Verified Owner
Monday, Jul 8 2019 (5 months ago)
ProTek RC 155S Digital "High Speed" Metal Gear Servo (High Voltage/Metal Case)
Great product! Has a very durable good looking housing. Very responsive and strong. So responsive I actually had to turn down the speed on my transmitter. Runs at a low temperature even on a hot day. All-around amazing project. Absolutely recommend to anybody great bang for your buck!
Verified Owner
Monday, Jul 8 2019 (5 months ago)
ProTek RC 155S Digital "High Speed" Metal Gear Servo (High Voltage/Metal Case)
This servo has all the speed and torque I need for my buggies. Great servo!
Verified Owner
Tuesday, Jul 23 2019 (5 months ago)
ProTek RC 155S Digital "High Speed" Metal Gear Servo (High Voltage/Metal Case)
Amazing servo for my 1/8 buggies. I have had the 170s and the 170sbl series and the 155s is the perfect setup for buggy. I actually like the fixed servo lead better than the 170sbl. This will be my go to for all 1/8 and 1/10 needs. Full disclosure I do get support from Protek but for the amain price, there is not a better servo on the market. Specs are above anything in the range and amain customer service is crazy good.