Narrow profile Locknuts with External Tooth Lock Washer

These locknuts fit in confined areas where standard-profile nuts cannot because they are about 20% narrower. They save assembly time by combining a free-spinning lock washer with a hex nut, which allows you to twist them into position by hand. To get the teeth to bite, use a wrench or socket to tighten the nut once it is against the surface of your material. These nuts are quicker to install than nylon-insert locknuts, but they can damage your material and are less vibration-resistant. You can reuse them as long as the washer remains intact. Also referred to as K-lock and Keps nuts.