2a thread class right-hand 0.376" thread length oval countersunk head style 32 thread quantity per inch chromium or nickel screw surface treated unc thread series
2a thread class right-hand 0.217" thread length flat chamfer head style 20 thread quantity per inch bail ring assembled on head; color olive drab; point on thd end 0.170 in. dia by 0.158 in. lg cadmium surface treated unc thread series
Used on vibration pickup bracket on pratt and whitney gas turbines models ft4a-2 and ft4a-12 onboard 378 and 400 foot coast guard vessels. 2a thread class double hexagon extended washer head style 24 thread quantity per inch unf thread series
3a thread class right-hand 0.251" grip length 32 thread quantity per inch 156000 single pounds per square inch shear strength nickel surface treated unjf thread series
Used on aircraft, hornet f/a-18. 3a thread class right-hand 0.505" grip length 28 thread quantity per inch 95000 single pounds per square inch shear strength unjf thread series
flush (flat) countersunk (included angle - less than 135 deg w or w/o chamfer) head style 49000 single pounds per square inch shear strength cadmium surface treated
