Used on use on survey instrument,azimuth-nsn 6675-00-062-8579. 2a thread class right-hand 0.880" overall length 40 thread quantity per inch heat treat:cond h-900-bar solution anneal at 1900 deg f, oil quench or air cool, age 1hr, at 900 deg f, air cool passivate surface treated unc thread series
3a thread class right-hand 0.368" thread length round w/wrench flats head style 20 thread quantity per inch passivate surface treated unc thread series
3a thread class right-hand 0.251" grip length 28 thread quantity per inch 156000 single pounds per square inch shear strength nickel surface treated 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
2a thread class right-hand 0.940" thread length hexagon head style 24 thread quantity per inch protrusion from top of head 0.200 in. long, 0.380 in. dia zinc surface treated unf thread series