2b first mounting facility thread class right-hand first mounting facility 0.250" second mounting facility thread length 1.560" overall length 1.440" overall width 32 first mounting facility thread quantity per inch unc first mounting facility thread series
2a single mounting facility thread class right-hand single mounting facility 0.312" single mounting facility thread length 1.156" overall length 0.910" overall width 48 single mounting facility thread quantity per inch unc single mounting facility thread series
2a single mounting facility thread class right-hand single mounting facility 0.312" single mounting facility thread length 1.156" overall length 0.910" overall width 48 single mounting facility thread quantity per inch unc single mounting facility thread series