2b single mounting facility thread class 4.250" overall length 32 single mounting facility thread quantity per inch tap, circuit selector unc single mounting facility thread series
2a single mounting facility thread class 0.312" single mounting facility thread length 1.337" overall length tap, circular, bushing mount unef single mounting facility thread series
2a single mounting facility thread class 0.417" single mounting facility thread length 2.531" overall length tap, circular, bushing mount unef single mounting facility thread series
2a all threaded stud thread class 0.187" all threaded stud thread length 32 all threaded stud thread quantity per inch unc all threaded stud thread series