Futaba FU0A08401 M3x8mm Servo Horn Lock Screw Replacement, 1 pcs  [FU0A08401]

Replacement lock screw overview

The Futaba FU0A08401 M3x8mm servo horn lock screw provides a direct replacement fastening for the metal gear servos named in the compatibility list. Its purpose is to hold the servo horn firmly to the spline so the horn cannot rotate under load, maintaining accurate steering or control surface movement.

This part fits the following models only: BLS275SV, 571SV, 371SV, S9373SV; ensure the horn and spline match your servo before purchase. The item is supplied as 1 pcs for straightforward swap-out during scheduled service or when changing horn geometry.

Fitting advice: thread the M3x8mm screw into the horn spline and use a suitable hex driver to seat it. Tighten until secure but stop short of over-torquing to avoid damaging the spline or horn. Re-check securement after initial operation and adjust if necessary.