2b single mounting facility thread class 2.281" overall length 24 single mounting facility thread quantity per inch tap, circuit selector unc single mounting facility thread series
2a single mounting facility thread class 0.250" single mounting facility thread length 1.230" overall length snap or line unef single mounting facility thread series
2a single mounting facility thread class 0.656" single mounting facility thread length 4.656" overall length 4.000" overall width rectangular panel mount unef single mounting facility thread series