2a single mounting facility thread class 0.437" single mounting facility thread length 1.770" 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 1.338" overall length miniature, bushing mount unf single mounting facility thread series
Used on tactical air control systems 407l; radar system antps43e. 2a thread class right-hand 1.231" overall length 18 thread quantity per inch modified thd; weapon system essential unef thread series