3a thread class right-hand 0.750" thread length double hexagon w/hole head style 0.060" hole diameter 28 thread quantity per inch center hole in head 0.140 - 0.150in. dia, 0.135 in. deep unjf thread series
Used on mk 16 mod 0 eod uba. 2a thread class 0.390" thread length knurled no. 2 head style 20 thread quantity per inch explosive ordnance disposal tools/equipment unc thread series
3a thread class right-hand 1.750" thread length flat chamfer head style 0.061" hole diameter 18 thread quantity per inch cadmium surface treated unrf thread series
Used on low altitude navigation & targeting infrared system. 3a thread class right-hand knurled no. 1 head style 28 thread quantity per inch anodize head surface treated unf thread series