2a second mounting facility thread class 0.547" overall length 0.203" overall width 40 second mounting facility thread quantity per inch chromate surface treated irregular unc second mounting facility thread series
2a single mounting facility thread class 0.312" single mounting facility thread length 3.333" overall length 2.063" overall width square wafer, panel mount unef single mounting facility thread series
2b thread class right-hand 1.500" overall length 28 thread quantity per inch includes terminating cadmium surface treated straight type uns thread series