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Overall length 3.8". Drilled for control radius of 1.737" (44.13mm), 1.5" (38mm) and 1.25" (36.75mm). Threaded for 3mm fasteners. Your ball joints made for 3mm or 4-40 bolts through the balls can be installed on this servo arm with 3mm fasteners. Horn fits on splines then clamps with tightening of two fasteners requiring a 2mm socket head wrench. No horn to spline slop is possible with this horn. SKU Number: RRCAA3.5FJ
Overall length 2". Drilled for control radius of 1.5" (44.13mm), 1.5" (38mm) and 1.25" (36.75mm). Threaded for 3mm fasteners. Your ball joints made for 3mm or 4-40 bolts through the balls can be installed on this servo arm with 3mm fasteners. Horn fits on splines then clamps with tightening of two fasteners requiring a 2mm socket head wrench. No horn to spline slop is possible with this horn. SKU Number: RRCLS3.5JR
Overall length 2". Drilled for control radius of 1.5" (38.1mm). Threaded for 3mm fasteners. Your ball joints made for 3mm or 4-40 bolts through the balls can be installed on this servo arm with 3mm fasteners. Horn fits on splines then clamps with tightening of two fasteners requiring a 2mm socket head wrench. No horn to spline slop is possible with this horn. SKU Number: RRCLS3.5FJ
Designed for use in aircraft, car, boat, & helicopter models. Unlike conventional servo arms, they are made of long fiber composites for added strength. Longer versions have increased throw allowing for greater movement in controls. 8 Horns black in color. SKU Number: DUB670
Designed for use in aircraft, car, boat, & helicopter models. Unlike conventional servo arms, they are made of long fiber composites for added strength. Longer versions have increased throw allowing for greater movement in controls. 8 Horns gray in color. SKU Number: DUB671
Designed for use in aircraft, car, boat, & helicopter models. Unlike conventional servo arms, they are made of long fiber composites for added strength. Longer versions have increased throw allowing for greater movement in controls. 8 Horns white in color. Fits Hitec, Tower Hobbies and Hobbico Command servos. SKU Number: DUB672
Designed for use in aircraft, car, boat, & helicopter models. Unlike conventional servo arms, they are made of long fiber composites for added strength. Longer versions have increased throw allowing for greater movement in controls. 8 Horns tan in color.
Designed for use in aircraft, car, boat, & helicopter models. Unlike conventional servo arms, they are made of long fiber composites for added strength. Longer versions have increased throw allowing for greater movement in controls. 8 Horns black in color. SKU Number: DUB673
Designed for use in aircraft, car, boat, & helicopter models. Unlike conventional servo arms, they are made of long fiber composites for added strength. Longer versions have increased throw allowing for greater movement in controls. 8 Horns gray in color. SKU Number: DUB674
Designed for use in aircraft, car, boat, & helicopter models. Unlike conventional servo arms, they are made of long fiber composites for added strength. Longer versions have increased throw allowing for greater movement in controls. 8 Horns white in color. Fits Hitec, Tower Hobbies and Hobbico Command servos. SKU Number: DUB675
MPI Aluminum Single Servo Arm - 2" SKU Number: MPIKA2002
Servo Horns and Hardware Sets
A servo horn transfers the output of a servo to the control linkage, so matching the horn to your servo spline is essential for a secure, slop-free fit. This category collects servo horns and hardware sets keyed to specific servo splines and brands.
Brand and Spline Fitments
Sets here are grouped by the servo they fit. The Hitec HS-755 horn and hardware set uses a 24 tooth spline, while the Hitec HS-65 class set fits a 25 tooth micro spline. Du-Bro micro horn sets are offered for servos such as the Spektrum DSP60 and ParkZone SV80, and the Dymond D47S set includes matching hardware.
Choosing the Right Set
Because spline counts vary between manufacturers and servo sizes, check the fitment listed for each set against your servo before ordering. Many sets bundle screws and linkage hardware alongside the horn itself.
Browse the sets below to find one matched to your servos.
 "Aluminum Large Double Servo Arm for Futaba Servos")
 "Aluminum Large Single Servo Arm for JR Servos")
 "Aluminum Large Single Servo Arm for Futaba Servos")
 "Du-Bro Futaba Super Strength Long Horn Set")
 "Du-Bro JR Super Strength Long Horn Set")
 "Du-Bro Hitec Super Strength Long Horn Set")
 "Du-Bro Airtronics Super Strength Long Horn Set")
 "Du-Bro Futaba Super Strength Standard Size Horn Set")
 "Du-Bro JR Super Strength Standard Size Horn Set")
 "Du-Bro Hitec Super Strength Standard Size Horn Set")
 "MPI Aluminum Single Servo Arm - 2\"")