IMPERIAL 42106 NYLON INSERT USS LOCK NUT 1/4–20" BX/100
"IMPERIAL" NYLON INSERT USS LOCK NUT Nylon Insert USS Lock Nut. Vibration resistant. Positive self-locking nylon collar. Zinc plating for corrosion resistance. Low carbon. Size:1/4-20. Thickness: 5/16. Box of 100.