2b thread class right-hand 2.187" overall length 18 thread quantity per inch nickel surface treated double clamping action open frame type uns thread series
2a single mounting facility thread class 0.437" single mounting facility thread length 1.822" overall length tap, circular, bushing mount unef single mounting facility thread series
2a single mounting facility thread class 0.250" single mounting facility thread length 1.242" overall length snap or line unf single mounting facility thread series
2a thread class right-hand 2.625" overall length 0.500" overall width item must comply with requirements of desc production standard no. L02264; for navy nuclear propulsion plant products only unc thread series