Allen Clevis Pin (4.9mm dia.)

9.5 or 15mm Long Clevis Pin.

A clevis pin is a type of fastener. It consists of a cylindrical pin with a head at one end and a cross-hole through the other end. The cross-hole allows for the attachment of a split pin to secure the clevis pin in place. On sailboats, clevis pins are commonly used for various purposes related to rigging.

The Engineering drawing for this pin can be found HERE