Used on ship, ohio class ssn (trident). 6 2nd end bolt hole quantity first end recessed 1.682 in. d 3.750 in. id; w/ten thd holes 0.250-20 unc 4.388 in. bolt c dia
3a all ends thread class 2.360" overall length end connection has 7/16-20 unjf 3a bulkhead thread anodize body surface treated male coupling half unjf all ends thread series
2b all ends thread class 12 all ends thread quantity per inch for navy nuclear propulsion plant products only male coupling half un all ends thread series
2b all ends thread class 1.370" overall length for navy nuclear propulsion plant products only zinc or cadmium body surface treated male coupling half unf all ends thread series