3.500" overall length 2.812" overall width 24 single mounting facility thread quantity per inch tap, circuit selector unc single mounting facility thread series
3a single threaded bushing thread class 0.375" single threaded bushing thread length 3.625" overall length 24 single threaded bushing thread quantity per inch cylindrical w/flange unf single threaded bushing thread series
2a single mounting facility thread class 0.250" single mounting facility thread length 2.375" overall length snap or line unef single mounting facility thread series