Used on RQ-4A. 3a thread class right-hand flush countersunk head style 0.307" grip length 32 thread quantity per inch 4010 double pounds per square inch shear strength aluminum surface treated unjc thread series
3a thread class right-hand 1.000" thread length flat chamfer head style 0.044" hole diameter 28 thread quantity per inch passivate surface treated unrf thread series
3a thread class right-hand 0.875" thread length flat chamfer head style 0.044" hole diameter 32 thread quantity per inch passivate surface treated unrf thread series
Used on RQ-4A. flush (flat) countersunk (included angle - less than 135 deg w or w/o chamfer) head style 0.501" grip length "u"designates rivet utilizing drive anvil washer as part of rivet assembly; washer allows use of blunt nosed installation tooling passivate surface treated
2a thread class right-hand 0.360" thread length flat chamfer head style 32 thread quantity per inch specification control drawing passivate surface treated unf thread series
Used on AH-1W. 3a thread class right-hand 0.425" thread length hexagon head style 0.365" grip length 28 thread quantity per inch navy-bolt passivate surface treated unjf thread series