2a single mounting facility thread class 0.437" single mounting facility thread length 2.591" overall length item must comply with requirements of desc production standard no. L02534; for navy nuclear propulsion plant products only tap, circular, bushing mount unef single mounting facility thread series
2a single mounting facility thread class 0.365" single mounting facility thread length 2.100" overall length circular wafer, bushing mount unef single mounting facility thread series