2a mounting facility bushing thread class right-hand mounting facility bushing 32 mounting facility bushing thread quantity per inch un mounting facility bushing 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 transparent tamperproof cover unc second mounting facility thread series
2a single mounting facility thread class 0.625" overall length 0.405" overall width 32 single mounting facility thread quantity per inch any acceptable surface treated hook, stud mounting unf single mounting facility thread series
2a single mounting facility thread class 1.350" overall length 0.800" overall width 40 single mounting facility thread quantity per inch unc single mounting facility thread series