Used on weapon systems-multifunctional radar transponder beacon, an/ppn-19(v)2; an/ppn-19 transponder set. 2b thread class 0.572" overall length 0.408" overall width 40 thread quantity per inch weapon system essential uns thread series
2a thread class right-hand 1.875" overall length 18 thread quantity per inch shell to shell conductivity shall be one millivolt max. unef thread series