2a thread class right-hand flat countersunk head style 7 thread quantity per inch one drilled slot on side of head, 0.188 inch in width unc thread series
2a thread class right-hand headless (setscrew) head style 40 thread quantity per inch TYPE6/6 nylon tip passivate fastener surface treated unc thread series
3a thread class right-hand headless (setscrew) head style 32 thread quantity per inch navy special project color black oxide surface treated unf thread series
2a thread class right-hand flat chamfer head style 11 thread quantity per inch the item is a socket set screw, and the head dimensions are 0.3125 in. minus unc thread series