Futaba FU1K12801 2pcs Cross-Arm Servo Horn for S3103/S3107/3153/3156/3157  [FU1K12801]

Product brief: horn cross-arm

The Futaba FU1K12801 servo horn cross-arm set comprises two pieces supplied as replacement or spare linkage arms for the specified Futaba servo models. They attach to D5mm style servo output shafts and supply a solid mounting point for steering and other RC control linkages.

Important notes: the unit is delivered without mounting screws or any packing materials, so suitable fasteners must be obtained separately; always check and align the spline before final tightening and ensure the horn is centred at neutral to avoid binding. Installation should emphasise mechanical accuracy and minimising play rather than electronic adjustments.

Practical fitting advice: fit one horn first to check central alignment, use correct fasteners for the servo spline and D5mm interface, and verify smooth travel at low transmitter input. Make small incremental linkage adjustments for trim and re-check centring and endpoint positions.

Works with these servos

• S3103
• S3107
• 3153
• 3156
• 3157