2b single mounting facility thread class 5.594" overall length 2.531" overall width 20 single mounting facility thread quantity per inch round threaded hole shaft tap, circuit selector unc single mounting facility thread series
2a single mounting facility thread class right-hand single mounting facility 2.447" overall length 1.431" overall width 32 single mounting facility thread quantity per inch unc single mounting facility thread series
2a single mounting facility thread class 0.375" single mounting facility thread length 2.940" overall length circular wafer, bushing mount unef single mounting facility thread series