2a single mounting facility thread class 0.437" single mounting facility thread length 3.283" overall length item must comply with requirements of desc production standard no. L01531; for navy nuclear propulsion plant products only tap, circular, bushing mount unef single mounting facility thread series
2a thread class right-hand 2.719" overall length 1.234" overall width item must comply with requirements of desc production standard no. L01552 unc thread series
0.620" overall length 0.185" overall width item must comply with requirements of defense electronics supply center production standard no. L01360 gold spring surface treated