3a thread class right-hand 1.230" thread length 32 thread quantity per inch end opposite head has slot 0.050 in. wide by 0.063 in. deep at 90.0 deg angle to shank hole unf thread series
2a thread class right-hand 0.900" thread length flat countersunk head style 20 thread quantity per inch cadmium or zinc screw surface treated unf thread series