2b single mounting facility thread class 2.906" overall length 32 single mounting facility thread quantity per inch snap or line unc single mounting facility thread series
2a single mounting facility thread class 0.437" single mounting facility thread length 2.245" overall length tap, circular, bushing mount unef single mounting facility thread series
2a single mounting facility thread class 1.375" 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