3a thread class right-hand 0.297" thread length button head style 28 thread quantity per inch cres pin 0.0533 in. dia. by 0.140 in. lg located 0.050 in. to 0.055 in. from bearing surface of head pin protrudes 0.060 in. above surface of shank dia. cadmium or cadmium surface treated unf thread series
3a thread class right-hand 0.297" thread length button head style 28 thread quantity per inch cres pin 0.053 in. dia by 0.140 in. lg located 0.040 in. to 0.045 in. from bearing surface of head pin protrudes 0.060 in. above surface of shank dia. cadmium surface treated unf thread series