About this part
ProTek RC PTK381 "ULP" High-Performance Racing Servo
The 381 Ultra Low Profile Servo brings together cutting-edge brushless technology and unmatched performance, delivering the holding power, speed, and precision that rival coreless servos. With the added advantages of brushless motors—greater efficiency and extended lifespan—this servo is the perfect choice for pro-level builds demanding top-tier reliability and accuracy. Housed in a sleek black anodized aluminum case for a premium look, the servo's design is both rugged and functional. The aluminum upper case ensures extreme durability, while the heat sink center case efficiently dissipates heat and reduces overall weight. Included is an aluminum single-arm clamping servo horn and a complete set of mounting washers for secure, long-lasting installation. Backed by a Lifetime Gear Warranty through Amain Hobbies for added confidence and durability.
About the ProTek 381ULP:
Size
This High-Performance Racing Servo is specifically designed for 1/10 on-road applications like Formula F1, with its ultra-low profile design allowing it to fit seamlessly into tight chassis spaces. Its compact size ensures optimal weight distribution, enhancing the performance of high-precision on-road vehicles.
Power & Gears
The ProTek RC PTK-381 ULP servo is equipped with a high-performance brushless motor and durable steel gears, ensuring maximum efficiency and longevity. The brushless motor provides smoother operation and higher torque, with less heat generation and longer lifespan compared to traditional motors. Additionally, the steel gears offer exceptional durability, resisting wear and maintaining precise performance even under the high-stress demands of competitive racing environments.
Application & Design
The ProTek ULP servo is a perfect fit for 1/10 F1 chassis, where space is often minimal due to tight servo fitment. Its ultra-low profile and sleek, squarish design ensure easy integration into narrow compartments, optimizing chassis balance and weight distribution.
Features:
- Lifetime Gear Warranty Backed by Amain Hobbies
- Ideal for 1/10 On-Road and Off-Road Racing Platforms
- Brushless motor
- High voltage circuitry
- Full steel gears
- Full aluminum black anodized heat sink case
- Single offset servo spline
Includes:
- (1) Lifetime Gear Warranty
- (1) 381 Ultra Low Profile High Speed Brushless Servo
- (1) Aluminum Clamping Servo Horn
- Servo Hardware and Grommets
Specifications:
| Application | 1:10 Scale |
|---|---|
| Operating Voltage | 6.0V - 8.4V |
| Operating Temperature | 14° to 140° F (-10 to +60° C) |
| Operating Speed @ 7.4V | 0.06/60° sec |
| Operating Speed @ 8.4V | 0.05/60° sec |
| Dynamic Torque @ 7.4V | 307oz-in (22.1 kg-cm) |
| Dynamic Torque @ 8.4V | 381oz-in (27.4 kg-cm) |
| Motor Type | Brushless Digital |
| Output Shaft | 25T |
| Gears | Steel w/Lifetime Gear Warranty |
| Weight | 54g |
| Pulse/Frequency | 1520s / 333hz |
| Dimensions | 39.5x20x25mm |
| Length (Bottom to Mount) | 14mm |
CA Residents Prop 65 Warning
WARNING: This product can expose you to chemicals including Di(2-ethylhexyl)phthalate (DEHP), which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov Details...Reviews5.0 · 4 reviews
I purchased this to compare to my trusty 160T servos and have no regrets in trying this new model. This is slightly shorter than the 160T and performs in every way I can ask for.
I am still building my X-ray 1:10 formula car. But this little servo fit in perfectly. I bought on advice of Amain hobbies. Good choice.
As of writing this review, I am currently pleased with the ProTek RC 381 servo. It has great speed and torque. It is a great upgrade from my original Futaba servo for my RC 10T.
This servo has been a powerhouse in my 1/10 Oval program. This servo fits perfectly in popular High Bite oval cars using servo mounting positions between the kick ups, no more shims to get proper fitment.
All four reviewers are verified owners who rate the ProTek RC 381 servo 5/5, and they describe it as a satisfying upgrade over earlier servos. Reviewers compare it favourably with a 160T and a Futaba servo, and report strong speed and torque. Two reviewers mention a close physical fit in 1/10 scale cars, one in an X-ray formula car and one in a High Bite oval car, where it mounts without shims. The reviews are uniformly positive, though they are few in number and none discuss durability, long-term use or the metal case in detail. The listed variant matches the reviews, but the reviews do not describe the high-voltage rating specifically.
- + Strong speed and torque
- + Slightly shorter than 160T servos
- + Fits 1/10 formula and oval cars without shims
- + Clear upgrade over older servos