Used on fighting vehicle systems, bradley (bfvs),los angeles class ssn (688),emory s. land class as,deep submergence systems programs(dssp),sonar sets, an/bqs-14a/15, missile, tomahawk,communications systems, an/wrr-7,interferometer direction finding system an/bld-1, sturgeon class ssn (637), seawolf class ssn. 0.401" hole diameter