Nylon Insert Locknut ?

Moonlite37

Well-known Member
Are they considered to be reusable as a lock nut? Or should they be replaced after one use, if in a critical application
 
Yes, lockouts with nylon inserts are usable as long as the "running torque" does not drop below a minimum value (that increases as the thread diameter increases). The informal guideline that I've heard is to replace the locknut after 5 installations . . . A first installation and 4 reinstallations.
 
Lucky for me there is a place nearby that sells hardware by the pound. Very good price on those stop nuts. If they don't have a good drag as you put them on I would replace them. In desperation you can put one on and take your torch. Heat it just enough so you see the plastic just starts to melt. Splash it with water. It will lock it up really good just one more time.
 
they are called nylocks. basically a one time use nut in overhead equipment. in non critical I would reuse them .plus more so with a lock washer under them.
 
If you have one near by Rural King has decent quality nylock nuts by the pound. How fast they lose tension is varied by how far they travel down the thread. My Kubota mower deck has the originals on the belt guards that are removed a couple times a year and they still turn with resistance but when tight the bolt thread is just above the nut.
 
If I remember, in Navy air craft engine school.
The nuts can be used over one time. What I could not figure out, is if the nut has been off before. Stan
 
Hello John Garner,

All good suggestions. I would put a drop of Loctite on the threads for piece of mind,

Guido.
 
Hello John Gardner,

Just put a drop 0f Loctite on the threads for piece of mind,

Guido.
 
I use HF boxes for the smaller ones. Did as you on farm store by the pound for an assortment of larger nuts I have in a clear plastic divided box which has come handy since deciding to do it. On most usage, I use old if it feels snug. If not it gets new.
 
(quoted from post at 08:24:45 02/20/20) Loctite dissolves the nylon. Use one or the other, not both.
Yes it does. Sort of. Point is, if the nylon has worn out and no longer provides prevailing torque, a drop or two of loctite or monkey spit will replace the functionality of the nylon. A new nyloc nut would be the preferred choice.
 
The biggest problem with buying the hardware in bulk is you walk down the isle past all of these big bins and just start scooping a handful of this and that. When you get home that 5/16 size nut you grabbed......you got SAE instead of coarse! Ahhh! In commercial kitchens they have big plastic containers full of spices. About one and half gallon size with a big screw cap on it. You can look through the plastic and see what you want and just reach right in. Then screw on the lid. Very handy containers.
 
Look like this. If you know your local diner ask if they will save you a few. Just wash them out. The opening is just big enough you can shove your hand in. That is around $30.oo cost and higher for the more costly spices.
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cvphoto5822.jpg
 
Hello Traditional Farmer,

YEP! great minds think alike. AND if the plastic melts? no longer needed!

Guido.
 
Gasp. I didn't buy that kind of quantity.....if you are using one container of that size per size of nut. Grin.

Hear you on getting the wrong size, which occurs often in loose bins where folks toss some back and hit the wrong bin. That's one reason I always overbuy hardware when working a job.
 
So you want me to throw away my Harley-Davidson locknuts and replace with new hardware store Chinese locknuts . No thank You.
 
So don't buy them from the hardware store. MMC, Fastenal, Grainger all sell quality hardware. The locknuts I happen to have in my hand (a different type, from MMC) were actually made in USA.

I've seen way too many Nylocs back off, even new ones. If it's really critical, or high vibration, I substitute deformed thread (Stover) nuts instead.
 
My experience is that the white nylon ones are a ?one time?
use. Genuine ESNA nuts are reusable. If you can turn them
by hand, they aren?t any good.
 

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