2b single mounting facility thread class 2.445" overall length 1.220" overall width 24 single mounting facility thread quantity per inch tap, square frame unc single mounting facility thread series
2a single pressure connection thread class 3.813" overall length 1.500" overall width 18 single pressure connection thread quantity per inch rectangular unf single pressure connection thread series
2b single mounting facility thread class 1.560" overall length 0.750" overall width 40 single mounting facility thread quantity per inch unc single mounting facility thread series
0.250" single mounting facility thread length 1.469" overall length 32 single mounting facility thread quantity per inch circular wafer, bushing mount un single mounting facility thread series