2a single mounting facility thread class 0.800" overall length 0.400" overall width 40 single mounting facility thread quantity per inch unc single mounting facility thread series
2b single mounting facility thread class 1.250" overall length 1.250" overall width 40 single mounting facility thread quantity per inch unc single mounting facility thread series
2a single threaded bushing thread class 0.500" single threaded bushing thread length 4.370" overall length 16 single threaded bushing thread quantity per inch cylindrical w/flange unf single threaded bushing thread series