Ball link

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A semi-spherical connection point for control linkages used widely in RC helicopters. Ball links mate to a socket end on a link rod and offer a wider range of movement than a regular linkage. This makes them ideal for things such as swashplates, which must move in several axes at once.

The ball link socket is often polarized, and the ball should only be pushed through that side to avoid damaging the link.

Ball link pliers make removing and joining these links easier. Ball link reamers allow the link to be opened up slightly to reduce resistance in the link.

Standard ball link balls are 3/16" (4.7mm) in diameter, and retained by an M2 screw. The threaded rod it connects to is typically either M1.3 (0.4mm pitch) or M2.

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