Used on propeller syn. 2b second mounting facility thread class 0.210" second mounting facility thread length 0.950" overall length 0.735" overall width unc second mounting facility thread series
2a single mounting facility thread class 0.752" overall length 0.940" overall width item must comply with requirements of defense electronics supply center production standard no. L04501; for navy nuclear propulsion plant products only irregular unc single mounting facility thread series