ProTek RC Aluminum Clamping Servo Horn (Blue) (25T-ProTek)

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ProTek RC Aluminum Clamping Servo Horn (Blue) (25T-ProTek)
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This is replacement ProTek R/C Aluminum Clamping Servo Horn, intended for use with ProTek R/C servos. This extremely tough servo-horn has been machined from a solid block of aluminum for incredible precision, rigidity and durability. The horn features a clamp type design that grips the servo’s output shaft so if the retainer screw comes loose, the horn will have a better chance of remaining in place, increasing your chances of finishing the race! Plus, the horn has a 3.5mm thick arm for durability, with 16.5mm and 20mm hole spacing threaded for 3mm hardware to suit the geometry and hardware requirements of most vehicles. Package includes one blue anodized servo horn, 3x10mm button head screw, 2x7.5mm clamp screw and a star lock washer.


  • Clamp design
  • 16.5mm and 20mm hole spacing (measured from output shaft screw hole, to linkage rod holes, center to center)
  • 3.5mm thick arm
  • 31mm Overall length
  • Linkage holes threaded for 3mm hardware
  • 25T Spline ProTek Output Shaft

ProTek R/C is an AMain Sports & Hobbies brand.

This product was added to our catalog on April 17, 2014

Jonathan Carlsen
Thursday, Jun 3 2021 (about 2 years ago)
ProTek RC Aluminum Clamping Servo Horn (Blue) (25T-ProTek)
This piece is amazing, its gorgeous and its helpfull
John Hamel
Verified Owner
Thursday, Nov 26 2020 (about 3 years ago)
ProTek RC Aluminum Clamping Servo Horn (Blue) (25T-ProTek)
Great servo for many 550 to 800 size helicopters. Many popular helicopters benefit from the 16.5mm M3 threaded hole of this servo arm for improved geometry compared to the more standard 20mm, 18mm (SAB), and 17mm (Mikado) plastic servo arms. I only wish there would be a carbon infused plastic version of this servo arm.