5/16" x 2-1/2" Plain Steel Tension Pins TNPN-205 (6 pcs.)

Diameter: 5/16"
Length: 2-1/2"
Material: Steel
Finish: Plain
Type: Tension Pin

Box of 6.

A tension pin is similar to a cotter pin, but it has very little play and is better able to withstand side loads and rotational friction.