2b single mounting facility thread class 3.750" overall length 4.125" overall width 24 single mounting facility thread quantity per inch tap, circuit selector unc single mounting facility thread series
2a thread class right-hand 2.375" overall length 1.219" overall width item must comply with requirements of desc production standard no. L02290; for navy nuclear propulsion plant products only unc thread series
right-hand 2.150" overall length 0.250" overall width left side d shape socket guide rotated 270 deg right side d shape pin guide rotated 270 deg clockwise from normal