2b all pressure connection thread class 0.500" first connection inside diameter 3.760" overall length 2.780" overall width 14 all pressure connection thread quantity per inch rectangular npsf second pressure connection thread series
Used on 5820-01-220-5951 radio set. 2b single mounting facility thread class 0.780" overall length 3.810" overall width 56 single mounting facility thread quantity per inch rectangular indicating unc single mounting facility thread series