2b thread class right-hand 0.750" err default 1.500" overall length four holes 0.281 in. dia by 0.250 in. deep equally spaced on 3.000 in. dia bolt circle on top end of nut knurled, internal thread, shouldered
2b thread class right-hand 0.430" err default 1.095" overall length four holes spaced 90 deg c to c located 0.200 from hole centers to head end, three holes 0.190 in. dia, 1 hole 0.164-32 unc 2b thd knurled, internal thread, shouldered
Used on ah/bra-24a. 2a thread class right-hand 0.344" err default 0.688" overall length center hole chamfered 45 degrees, 0.016 in depth both ends hexagon, external thread, boss