Partially Threaded has an unthreaded spot slightly below the head then has partial threading together the rest of the human body. The part that is not threaded is referred to as the grip length. Flange lock dimension measures with the nominal thread diameter. Measurements ordinarily vary from 1/four″ to 1″ https://threadedbarrelprotector12198.blogocial.com/indicators-on-car-nuts-you-should-know-64333146