2b second mounting facility thread class right-hand second mounting facility 3.250" overall length 3.090" overall width 32 second mounting facility thread quantity per inch unc second mounting facility thread series
2b thread class right-hand 1.240" overall length 0.962" overall width 28 thread quantity per inch cadmium surface treated straight type w/cable clamp un thread series
2a single mounting facility thread class 0.312" single mounting facility thread length 3.841" overall length tap, circular, bushing mount unef single mounting facility thread series