2a single threaded bushing thread class 0.373" overall length 28 single threaded bushing thread quantity per inch plug unf single threaded bushing thread series
2a all threaded stud thread class 0.187" all threaded stud thread length 40 all threaded stud thread quantity per inch disc unc all threaded stud thread series
2a single mounting facility thread class 0.375" single mounting facility thread length 2.859" overall length tap, circular, bushing mount unef single mounting facility thread series
2b single mounting facility thread class 5.625" overall length 4.125" overall width 20 single mounting facility thread quantity per inch tap, circuit selector unc single mounting facility thread series