Used on an/sps-40e radar; iwo jima class lph; mine countermeasures support (mcs) class (lph-12); radar, search, an/sps-40; wasp class lhd; blue ridge class lcc-19; whidbey island class lsd; austin ship class lpd-4 amphibious trasnport docks; spruance class dd (963); tarawa class lha. 2b single mounting facility thread class 3.406" overall length 16 single mounting facility thread quantity per inch weapon system essential snap or line unc single mounting facility thread series