Used on fixture assembly,te;connector,receptacle,electric,box mounting,solder contacts, an type.. 2a thread class right-hand 1.697" overall length 1.625" overall width 18 thread quantity per inch navy:connector, receptacle, electrical 9contact positions b, d, f contact size 16, wire size (mil-w-5086) 16 thru 20, operating voltage (dc) 700v, operating voltage (rms) 500v; contact positions a unef thread series