3a thread class left-hand 1.7475" overall length 0.3120" bore diameter 28 thread quantity per inch chromium inner member surface treated ball type unjf thread series
3.3500" outside diameter item has two keys, 180 degrees apart, which measure 0.4700 in. min. AND0.4800 in. max.; item used on the F101-ge-102 engine round with lugs