3a thread class right-hand 0.1900" thread length 32 thread quantity per inch 160 to 180 ksj ultimate tensil; tri slot recess, 6al 4v, full unjf thread series
2a thread class right-hand 0.875" thread length pan head style 32 thread quantity per inch screw, pan head, self sealing oxide screw surface treated self seal unf thread series
Used on ch-53d aircraft model. 2a thread class right-hand 0.430" thread length flat countersunk head style 32 thread quantity per inch screw, dispenser, housing screw material is 300 cres; locking strip is blue kel-f unf thread series
Used on c-17a acft. 3a thread class right-hand straight pan head style 1.188" grip length 32 thread quantity per inch pin-rivet, threaded head indented; centered point 0.05 min 0.06 max dia; 0.01 min 0.03 max depth aluminum surface treated unjf thread series