2a single mounting facility thread class 1.310" overall length 0.930" overall width 40 single mounting facility thread quantity per inch unc single mounting facility thread series
2b single mounting facility thread class 5.062" overall length 2.500" overall width 24 single mounting facility thread quantity per inch tap, circuit selector unc single mounting facility thread series
2a single mounting facility thread class 2.625" overall length 20 single mounting facility thread quantity per inch unef single mounting facility thread series