2a thread class right-hand 2.125" overall length 20 thread quantity per inch 16-22 pin contacts in lieu of 16-16 or where applicable, it indicates a full complement of 12-16 pin contacts in lieu of 12-12 unef thread series
2a thread class right-hand 2.125" overall length 16 thread quantity per inch 16-22 socket contacts in lieu of 16-16 or where applicable, it indicates a full complement of 12-16 socket contacts in lieu of 12-12 un thread series