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 6320-00-450-7014
NSN 5835-01-509-8992
NSN 6110-01-380-9800
NSN 6135-01-426-8282
NSN 6610-01-394-1071
NSN 4140-00-307-2732
NSN 6240-01-608-4401
NSN 5965-01-265-6814
NSN 6220-00-567-2003
NSN 5945-01-205-5094
NSN 6135-01-516-8171
NSN 6620-00-366-1365