Used on c-130 aircraft. 3a thread class right-hand 1.244" thread length double hexagon extended washer head style 3.125" grip length 14 thread quantity per inch cadmium surface treated unjf thread series
2a thread class right-hand 0.518" thread length oval head style 20 thread quantity per inch 18-8 stainless steel phillips oval head machine screw use a countersink to create a recess. the body diameter of your countersink should be equal to or larger than your screws head dia unc thread series
Used on uk trident submarine d5 mhc water heater proportional controller modified. 2a thread class right-hand 0.625" thread length 20 thread quantity per inch unc thread series
Used on c-135 aircraft. 3a thread class right-hand 0.425" thread length hexagon head style 4.250" grip length 28 thread quantity per inch cadmium surface treated unjf thread series