3b thread class right-hand 1.380" thread length 16 thread quantity per inch item contains one hole 1/4-28unf-2b, .48 deep csk 90 degrees to .26 dia phosphate surface treated unef thread series
3a thread class right-hand 0.750" thread length 3.984" overall length 20 thread quantity per inch concentric hole 0.181 in. min, 0.187 in. max dia drilled thread end 2.437 in. min, 2.500 in. max deep cadmium surface treated round, closed w/shoulder unjf thread series
2a thread class right-hand 0.950" thread length 4.938" overall length 13 thread quantity per inch navy special project round, closed w/shoulder unc thread series
3a thread class right-hand 1.000" thread length 1.406" overall length 28 thread quantity per inch navy special project passivate surface treated round, closed unf thread series
2a thread class right-hand 0.625" thread length 2.312" overall length 20 thread quantity per inch protect threads from paint paint surface treated round, open unc thread series