2a single mounting facility thread class 0.437" single mounting facility thread length 2.591" overall length tap, circular, bushing mount unef single mounting facility thread series
2a single mounting facility thread class 0.250" single mounting facility thread length 4.000" overall length snap or line unef single mounting facility thread series
Used on aircraft, galaxy c-5. 2b thread class right-hand 4.293" overall length 0.415" overall width 40 thread quantity per inch weapon system essential unc thread series