2a thread class right-hand 4.205" thread length fillister head style 48 thread quantity per inch phosphate manganese screw surface treated heat treatment: before threading, heat at 1500-1550 deg. f., oil quench, temper 30 min. to hardness specified; 0.062 in. dia. hole in side of head unf thread series
Used on mark iv weather satellite. 2a thread class right-hand 0.625" thread length hexagon countersunk head style 0.093" hole diameter 20 thread quantity per inch navy special project passivate surface treated unc thread series
3a thread class right-hand 1.508" thread length flat chamfer head style 11 thread quantity per inch material: steel comp A574 ; locking feature: self-locking type l per mil-dtl-18240 ; surface finish: phosphate per tt-c-490 type i phosphate surface treated unc thread series
2a thread class right-hand 0.508" thread length flat countersunk head style 20 thread quantity per inch passivate fastener surface treated unc thread series
Used on hemtt family (heavy expanded mobility tactical trucks); 2330-01-303-5197 pls trailer. 0.875" thread length 16 thread quantity per inch material grade 5 steel
3a stud thread thread class right-hand stud thread 0.625" stud thread thread length 2.400" overall length 20 stud thread thread quantity per inch hexagonal shaft 0.370 in. wd btwnflats extending 0.508 in. from threadsto end of stud end passivate surface treated self-locking unf stud thread thread series
2a thread class right-hand 0.380" thread length fillister head style 40 thread quantity per inch phosphate manganese screw surface treated 0.093 in. dia. hole in side of head unf thread series
3a thread class right-hand 0.702" thread length hexagon countersunk head style 28 thread quantity per inch extended washer 0.501 in. dia x 0.150 in. min, 0.188 in. max thick unf thread series
