2b all threaded hole thread class 0.197" single connection inside diameter 1.027" overall length 40 all threaded hole thread quantity per inch cylindrical unc all threaded hole thread series
2a all threaded stud thread class 0.271" all threaded stud thread length 0.951" overall length 32 all threaded stud thread quantity per inch plug unc all threaded stud thread series
3a single threaded bushing thread class 0.440" single threaded bushing thread length 4.633" overall length cylindrical unf single threaded bushing thread series