2a single mounting facility thread class 0.312" single mounting facility thread length 1.915" overall length tap, circular, bushing mount unef single mounting facility thread series
Used on aircraft, tomcat f-14. 2b single mounting facility thread class 2.050" overall length 32 single mounting facility thread quantity per inch tap, circular, bushing mount unc single mounting facility thread series
Used on aircraft tomcat f-14. 3b single pressure connection thread class 2.800" overall length 20 single pressure connection thread quantity per inch cylindrical unf single pressure connection thread series