Used on w/s:aircraft, c-2a (reprocured); helicopter, mh-53e; virginia class submarine, ssn-774; family of medium tactical vehicles-medium; helicopter, advance attack, ah-1w; helicopter, search and rescue, hh-60h; helicopter, uscg search and rescue, hh-60j; aircraft, prowler ea-6b; helicopter, carrier based asw, sh-60f; crane, wheel mtd:20-ton w/blk tackle. 0.526" hole diameter zinc surface treated