2a single mounting facility thread class 2.400" overall length 1.590" overall width 32 single mounting facility thread quantity per inch unc single mounting facility thread series
4.062" overall length 4.375" overall width 20 single mounting facility thread quantity per inch auxiliary mounting method, rear support bracket, two 0.312 inchdia mounting holes, 3.812" distance between mountinghole centers tap, circuit selector unc single mounting facility thread series