2b thread class right-hand 1.700" overall length 1.188" overall width 18 thread quantity per inch four no. 4-40 thd tapped holes on 0.906 in. by 0.906 in. mtg centers unf thread series
2a single mounting facility thread class 0.375" single mounting facility thread length 1.562" overall length auxiliary switch enclosed ac 125v 8 amp circular wafer, bushing mount unef single mounting facility thread series