3a single mounting facility thread class 0.375" single mounting facility thread length 3.094" overall length 1.625" overall width unc single mounting facility thread series
2a single mounting facility thread class right-hand single mounting facility 1.415" overall length 0.610" overall width 56 single mounting facility thread quantity per inch unc single mounting facility thread series
2b second mounting facility thread class right-hand second mounting facility 3.250" overall length 3.090" overall width 32 second mounting facility thread quantity per inch unc second mounting facility thread series