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 2 3/4" and the thread on the end is 5/16-22 TPI BSF.
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.
Thread = 5/16-22 TPI British Standard Fine
