Futaba FU0A08401 M3x8mm servo horn lock screw for metal gear servos, 1 pcs  [FU0A08401]

Servo horn lock screw

This Futaba FU0A08401 M3x8mm servo horn lock screw is a single replacement fastening screw for metal gear servos listed in the compatibility group. It is intended to lock the servo horn to the spline so the horn does not slip under load, preserving steering or control surface accuracy on RC models.

Compatibility is limited to the specified models: BLS275SV, 571SV, 371SV, S9373SV; use only with matching servo horns and splines. The part is supplied as 1 pcs for straightforward replacement during routine maintenance or when changing horns for different throw or geometry.

Installation tip: thread the M3x8mm screw into the horn spline and tighten with an appropriate hex driver until secure, avoid over-torquing to prevent damage to the servo spline or horn. Check for play after installation and re-tighten if necessary during initial run-in.