UNC 3/4 x 4″ BZP, hex head shoulder bolt. Pk 5.

The most common type of fastener, a hex head bolt is designed to be tightened with a standard spanner or ratchet and socket. Popularly used in all assemblies, a standard hex bolt is a staple across the world. Includes an unthreaded section of the shaft. A hex drive permits a greater torque load to be applied to the joint over most other drive types.