Socket Shoulder bolts are fasteners that have an unthreaded portion of the shank that functions as a bearing surface or spacer.
These are measured by the Shoulder Only, for this size the shoulder diameter is 3/8", the length of the shoulder is 1/2" and the thread on the end is 5/16 18 TPI UNC.
It is important to note the threaded portion is NOT included in the length.
They have an in-hex drive and are fastened using a hexagonal wrench also known as an Allen key. Use Allen key size = 3/16"
Thread pitch = 5/16- 18 TPI
