3b thread class 32 thread quantity per inch three holes 0.099 in. min 0.119 in. max dia spaced 120 deg apart 0.020 in. min 0.028 in max from pilot end oxide surface treated plain unf thread series
3b thread class right-hand 0.469" thread length 24 thread quantity per inch staggered coils' grip location; bare inserts dyed red coil unf thread series