Partially Threaded has an unthreaded place just below the head after which you can has partial threading together the rest of the entire body. The portion that isn't threaded is named the grip size. Flange lock measurement measures by the nominal thread diameter. Sizes commonly vary from 1/4″ to 1″ https://lt1001cn8-pbf21864.thezenweb.com/a-secret-weapon-for-hex-nuts-66573158