3a thread class right-hand 0.440" thread length 0.785" overall length 40 thread quantity per inch passivate surface treated round, open unc thread series
3a thread class right-hand 0.500" thread length 4.057" overall length 44 thread quantity per inch cadmium surface treated round, open unf thread series
2a thread class right-hand 1.500" thread length 2.469" overall length 16 thread quantity per inch cadmium or zinc surface treated round, closed unc thread series
2a thread class right-hand 2.062" thread length 3.500" overall length 24 thread quantity per inch 0.156 in. spherical radius on end of hook phosphate surface treated round, open unf thread series