Spektrum Set Screw Prop Adapter – 4.0mm Motor Shaft to 1/4x28 Prop Thread [SPMXAMA4936]

Secure your propeller with confidence using the Spektrum Set Screw Prop Adapter (part number SPMXAMA4936), designed to adapt a 4.0mm motor shaft to accept a 1/4x28 threaded propeller. Ideal for electric airplane builds, this precision-machined adapter ensures smooth, concentric rotation and tight prop mounting for efficient, vibration-free performance.

The built-in set screw collar locks the adapter firmly to the motor shaft, making it a reliable choice for sport and aerobatic setups.

Key Features:

• Part Number: SPMXAMA4936

• Motor Shaft Fitment: 4.0mm

• Prop Thread: 1/4x28 (standard fine thread)

• Material: Precision-machined aluminum

• Locking Mechanism: Dual set screw collar for secure grip

• Use Case: Adapts electric motor shafts to threaded propeller hubs

• Ideal for: Electric RC airplanes using 4.0mm motor shafts and threaded props

• Includes:

  • Prop adapter

  • Set screws (pre-installed or included)

Get the right fit between motor and prop with the Spektrum 4.0mm to 1/4x28 Prop Adapter—a small but essential upgrade for reliable, balanced power delivery.