2b single mounting facility thread class 4.125" overall length 1.375" overall width 40 single mounting facility thread quantity per inch unc single mounting facility thread series
2a single mounting facility thread class right-hand single mounting facility 1.875" overall length 1.512" overall width 32 single mounting facility thread quantity per inch unc single mounting facility thread series
2b single mounting facility thread class 1.180" overall length 1.120" overall width 40 single mounting facility thread quantity per inch unc single mounting facility thread series