Used on helicopter, kiowa oh-58 a&c. 3a 1st end thread class 4 2nd end bolt hole quantity weapon system essential passivate surface treated unef 1st end thread series
3a 1st end thread class 4 2nd end bolt hole quantity counter bore second end, 0.406in.dia; positioning notch w/ 0.1in. radius located second end; e/I5905-00-977-2455 unf 1st end thread series
3a 1st end thread class 2 2nd end bolt hole quantity recessed on flange end, 0.090 in. min, 0.110 in. max depth, 0.670 in. min, 0.710 in. max dia anodize surface treated unf 1st end thread series