3a thread class right-hand 0.970" thread length button head style 20 thread quantity per inch 1/4-20X1 inch zinc plated button head socket cap screw material zinc surface treated unrc thread series
3a thread class right-hand 0.970" thread length button head style 32 thread quantity per inch 10-32X1 inch plain finish button head socket cap screw material oxide surface treated unf thread series
2a thread class right-hand pan head style 20 thread quantity per inch 1/4"-20X3/4" phillips pan head zinc plated machine screw zinc screw surface treated unc thread series
Used on b-52 aircraft. 3a thread class right-hand 0.625" thread length hexagon head style 28 thread quantity per inch cadmium surface treated unjf thread series
2a thread class right-hand pan head style 32 thread quantity per inch 8-32X3/4" phillips pan head zinc plated machine screw zinc screw surface treated unc thread series
2a thread class right-hand 20 thread quantity per inch 1/4" - 20 x 1 inch phillips flat head zinc plated machine screw zinc screw surface treated item has phillips flat head unc thread series