KNS Precision 1/2-36 to 5/8-24 Thread Adapter Black Nitride Finish KNS 1/2-36 to 5/8-24 TA. KNS Precision 1/2-36 to 5/8-24 Thread Adapter Black Nitride Finish KNS 1/2-36 to 5/8-24 TA.