2b 1st mounting facility thread class 10.183" overall length 4.375" overall width 20 1st mounting facility thread quantity per inch item must comply with requirements of desc production standard no. L03998; for navy nuclear propulsion plant products only tap, circuit selector unc 1st mounting facility thread series
Used on 4935-00-930-7250 test station,guided missile system. 2a thread class left-hand 2.016" overall length 3.250" overall width 18 thread quantity per inch special acme thread series