2a thread class right-hand 0.400" thread length flat fillister head style 0.112" hole diameter 40 thread quantity per inch passivate screw surface treated hole in head threaded 0.112-40-unc x 0.220 in. dp unc thread series
3a thread class right-hand 0.407" thread length pan no. 2 head style 32 thread quantity per inch cadmium or zinc screw surface treated unf thread series