Used on cowl door latch c-141. 2a thread class right-hand 1.750" thread length 3.420" overall length 24 thread quantity per inch oblong, closed unf thread series
3a thread class right-hand 0.580" thread length double hexagon extended washer head style 24 thread quantity per inch nickel surface treated unjf thread series
Used on b-1b acft. flush (flat) countersunk (included angle - less than 135 deg w or w/o chamfer) head style 0.678" grip length aluminum sleeve surface treated
Used on b-1b acft; w/s: aircraft, b-1b; aircraft, stratolifter c-135. 3a thread class right-hand 0.508" grip length 32 thread quantity per inch unjf thread series