3a thread class right-hand 1.020" thread length flat countersunk head style 24 thread quantity per inch phosphate screw surface treated unf thread series
2a thread class right-hand 0.375" thread length flat countersunk head style 20 thread quantity per inch cadmium or zinc screw surface treated unc thread series
3a thread class right-hand 0.899" thread length wing no. 2 head style 16 thread quantity per inch navy special project 0.064" diameter hole 0.1875" plus or minus .020 from threaded end unc thread series
3a thread class right-hand 0.240" thread length fillister head style 16 thread quantity per inch groove 0.150 in. from brg surf of hd between thd unc thread series
