Used on nimitz class cvn, forrestal class cv, virginia class cgn (41); low presure (lp) dry air dehydraters; main feed pumps; support equipment, b-52 aircraft; trainer, b-1b aircraft; boilers, 1200 psi; air compressors, high pressure. 2a single mounting facility thread class right-hand single mounting facility 0.312" single mounting facility thread length 1.920" overall length 1.468" overall width 32 single mounting facility thread quantity per inch weapon system essential unc single mounting facility thread series