Aluminum Propeller Locker/Adapter For RC Quadcopter

M5 Propeller Nut Cap Set (CW and CCW) for Brushless DC Motors

This product is a set of two M5 propeller nut caps, one clockwise (CW) and one counter-clockwise (CCW), for brushless DC motors. The nut caps fit above the propeller to lock it on the motor shaft.

The listing describes them for the 1306 and 3100 brushless motors and gives a thread size of M5, a cap height of 14mm and a black colour. The material is listed as high-quality plastic although the title says aluminium.

Nut caps of this kind are an inexpensive way to keep a propeller secure and to replace a lost or damaged nut.

Key features

• CW and CCW pair: the right nut for each motor direction.

• M5 thread: a common thread size for brushless motor shafts.

• 14mm cap height: sits clear of the propeller.

• Black finish: a neat look on most builds.

• Low cost: an easy way to keep spare nut caps.

How prop nut caps work

A propeller nut cap threads onto the motor shaft above the propeller and clamps it in place. Because a propeller turns in one direction, the nut is made with a thread that tightens as the motor spins: clockwise-turning motors use one thread direction and counter-clockwise motors use the other. Using the wrong nut on a motor can let it unscrew in flight.

Check the direction mark on each nut, match it to the direction of the motor and tighten it snugly by hand or with a small tool. Do not over-tighten plastic nuts, since the thread can strip. Inspect the nuts for cracks before each flight and replace any that are damaged.

A tidy, well-built airframe flies better and lasts longer. Check every screw after the first few flights, use thread-locking compound on metal fasteners, keep wires away from moving parts and inspect the frame and accessories for cracks after any crash. Small parts like these are cheap compared with the electronics they protect, so replace them as soon as they wear out.