No. 12 spline size
An item having an internal drive at one end made to fit into the external drive end of a socket wrench handle, torque wrench, or power driven tool. The opposite end consists of various internal wrench shapes such as hexagon or square. It may include an integral universal joint.
Classification: Socket wrenches with or without handles, drives and extensions, parts, base metal
NSN 6105-01-660-2193
NSN 5930-01-228-3924
NSN 4140-01-062-6088
NSN 5996-01-047-4202
NSN 6610-01-456-1166
NSN 5998-00-717-6629
NSN 6320-00-513-8376
NSN 6320-00-593-0379
NSN 5996-01-248-9699
NSN 5935-00-932-3052
NSN 6130-01-445-0825
NSN 5945-01-568-7027