2a single mounting facility thread class 3.406" overall length 1.500" overall width 32 single mounting facility thread quantity per inch operating current type ac unc single mounting facility thread series
2b thread class right-hand 1.500" overall length 1.500" overall width 40 thread quantity per inch 0.812 in. cutout on one side chromate surface treated square shape unc thread series
2b single mounting facility thread class 1.875" overall length 1.094" overall width 32 single mounting facility thread quantity per inch unc single mounting facility thread series