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Keps K Lock Nuts
Hex Nuts with an Attached Free-Spinning Washer
A Keps k nut lock nut is a nut with an attached, free-spinning washer. It is used to make assembly more convenient. K Lock Nuts Feature a conical external tooth washer attached to the bottom of the nut. Keps K Lock Nuts are available in 304 Stainless Steel and Zinc Plated Steel.
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Trade Names: Keps K nut, K-nut or washer nut.
How to Install Keps K Lock Nuts | Fasteners 101
How to Install Keps K Lock Nuts Transcript
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Bob: This is called a K lock nut or Keps lock nut.
These have these little wings that are here, and this is a free-rolling washer lock nut. So those little wings get tightened and the key to this is not to over tighten them. Once you over tighten this, it's no longer a lock nut and that free-rolling washer gets crushed and it just doesn't work for you anymore. So, the key to this is not to torque it down too tight. Very common, this is a very common lock nut.
Okay I have a K lock nut here. I'm going to demonstrate it. I have a hole that's in this piece of steel. I put my hex cap screw through and I'm going to hand-tighten this k lock nut or Keps nut onto this piece of steel.
As you can see here, I just snugged it up with my hand. Then I'm only going to turn it a couple times (with a wrench) to tighten it. Alright, so I'm just going to tighten this up a little bit. That was it right there. I just snugged it up, not overpowering the nut.
If you had something that this just had to be tightened up to and it would free spin, that washer-the nut will turn, but the washer will stay in its original spot. You can see right there, you can see the nut keep spinning, also if you over tighten this it's just going to flatten out that locking mechanism on this lock washer thus it's just going to become loose over time; it'll just vibrate loose.
That's the k lock nut.