2b thread class right-hand 1.850" overall length 0.250" overall width 56 thread quantity per inch item must comply with requirements of desc production standard no. L03971; for navy nuclear propulsion plant products only unc thread series
2a thread class right-hand 1.350" overall length 0.250" overall width 56 thread quantity per inch item must comply with requirements of desc production standard no. L03975; for navy nuclear propulsion plant products only unc thread series
2a thread class right-hand 1.375" overall length 0.490" overall width 36 thread quantity per inch furnished items - preformed packing uns thread series