Used on howitzer, 155mm, m777e1. right-hand flat fillister head style adapter, thumbscrew threads listed are for outside dia; inside threads M6 x 1 m thread series
flush (flat) countersunk (included angle - less than 135 deg w or w/o chamfer) head style two marks raised or recessed on head. diameter is .030" max, .010" high. cadmium surface treated
flush (flat) countersunk (included angle - less than 135 deg w or w/o chamfer) head style rivet, 100 deg precision head, close tolerance shank supersedes p/n BACR15BA5AD7 chromate surface treated