2a thread class right-hand 0.350" thread length hexagon head style 32 thread quantity per inch item has a slot located at the headless end passivate surface treated unc thread series
2a thread class right-hand 0.210" thread length hexagon head style 32 thread quantity per inch undercut between shoulder passivate surface treated unc thread series
3a thread class right-hand 0.372" thread length oval countersunk head style 28 thread quantity per inch hex hole on threaded end with 0.0947 min passivate surface treated unjf thread series
3a thread class right-hand 0.605" thread length knurled no. 1 head style 16 thread quantity per inch finish color black oxide bearing surface of head surface treated unc thread series