Matl steel per mil-s-5000; 0.38 in. Long; body externally threaded 1.375 in.-18nef-3a; groove 0.07 in. Min and 0.08 in. Max wide to 1.284 in. Min and 1.294 in. Max dia; flange 6 sided 1.489 in. Min and 1.502 in. Max across by 0.075 in. Min and 0.085 in. Max thick; bore 0.998 in. Min and 1.008 in. Max dia