2b thread class right-hand 1.093" overall length 20 thread quantity per inch nickel surface treated double clamping action open frame type unef thread series
2a single mounting facility thread class 0.312" single mounting facility thread length 2.102" overall length tap, circular, bushing mount unef single mounting facility thread series
2a single mounting facility thread class 0.312" single mounting facility thread length 1.666" overall length tap, circular, bushing mount unef single mounting facility thread series