Nyla nuts

[Big Barn]

I'll add in that you should NOT install a nylock nut with an impact gun of any sort

Yup

 

[dragoneggs]

Nyloc is trademarked in Australia. Good for a few cycles but generally does not meet NASM25027 Standard for self locking nuts. 15 cycles is considered minimum for reuse. Also okay for room temp applications but not good around heat sources such as combustion engines or compressors. Again a minimum standard is usually 450degF. the Nylon is good up to 250degF. Also, long term exposure to UV will deteriorate them.

Around the house or farm... acceptable... on an airplane... No. That said, I use them on some projects instead of Loctite but I have way more faith in the Loctite.

 

[Big Barn]

Nyloc is trademarked in Australia. Good for a few cycles but generally does not meet NASM25027 Standard for self locking nuts. 15 cycles is considered minimum for reuse. Also okay for room temp applications but not good around heat sources such as combustion engines or compressors. Again a minimum is usually 450degF. the Nylon is good up to 250degF. Further long term exposure to UV will deteriorate them.

Around the house or farm... acceptable... on an airplane... No. That said, I use them on some projects instead of Loctite but I have way more faith in the Loctite.

I prefer Loctite on assemblies that are tightened.

For things like axle bolts that may turn or a threaded shaft with nut used in place of a hole and cotter pin I will use a self locking nut if only because I like to do it that way.

 

[Doug62]

These on anything critical

https://en.m.wikipedia.org/wiki/Distorted_thread_locknut

Red Loctite and a lock washer next.

Nylocs are okay for non heat environments if changed out regularly. I do not trust plastic to hold up all that long.

 

[rScotty]

I guess? Lock nut? Makes sense.

These nuts came out years ago, they seem to have nylon or something on the threads which I guess acts as a lock nut?
I think they are great but, if you don稚 tighten them, why use a nut.
I have probably 8-10 between the fel and bh, all the same. The nut is at least 1/8th inch from making contact, not even close to clamping down.
I don稚 care but, again, if you are not going to tighten the nut, why use a nut and bolt?

I bet there is a good reason, I知 just curious.

I can't think of a good reason, can you? Other than pure forgetfulness that is.... You seem to be asking, "would they work untightened in the same way as cotterpins where the bolt is being used as a locating pin?"

That's a good question, and the answer is I don't know for sure. Nylocks do have a repeatable non-zero threading torque, so I can see where they might. But it would depend on the application.

I have noticed on our Kubota that the factory made some odd choices with some of their fasteners. Particularly on the dash, controls, floor, & backhoe.

Where are yours located and what is the function there? Is it in a place you would expect a pin? Or a bolt? I rather doubt they unscrewed themselves that far.

Used traditionally for sealing and anti-vibration, Nylocks are pretty good for industrial & ag machinery. But of course they still have to be torqued same as any bolt & nut. I'm assuming that you torqued yours down properly. Did anything change with the FEL & BH when you tightened them up?
rScotty

 

[Frankenkubota]

Thx

Still Makes no sense to me except, maybe the dealer forgot to tighten?

I guess the bh and fel are installed at dealer? If so then...

I bet that痴 it!

I知 calling the dealer.

 

[shovelmike]

A bolt with a lock nut is a lot more durable faster vs a pin with cotter pin that is easily snagged by brush and pulled out.

A hairpin would pull out easily, a properly installed cotter pin would not. The pins on a couple of linkages under my eMax are secured by hairpins, and I will replace them with cotter pins if I head into the brush.

 

[Mat4644]

Nyloc is trademarked in Australia. Good for a few cycles but generally does not meet NASM25027 Standard for self locking nuts. 15 cycles is considered minimum for reuse. Also okay for room temp applications but not good around heat sources such as combustion engines or compressors. Again a minimum standard is usually 450degF. the Nylon is good up to 250degF. Also, long term exposure to UV will deteriorate them.

Around the house or farm... acceptable... on an airplane... No. That said, I use them on some projects instead of Loctite but I have way more faith in the Loctite.

Just like conventional nuts and bolts there are multiple grades and specifications for elastic stop nuts. The ones most are familiar with are the lowest grade. You're not going to be able to pick up a bag at Walmart that will be certified to use on aircraft.

 

[Frankenkubota]

By Nyla nut, are you speaking of a lock nut?

Here痴 a photo of my nylanut issue. I guess there are 8-10 of them between the fel and bh and they are all identical so, I figured it was done that way on purpose.

The comment about the dealer installed accessories seems to make sense. I planned to call the dealer but, we have again had 3 out of 6 days of rain, that痴 every other day! Constant recovery mode.

I will call dealer Monday!

 

[LouNY]

That bolt and nyloc nut is just to keep the pin from rotating ,
the nyloc is just to keep the bolt from falling out.
No reason for it to be any tighter it is not in a location requiring any specified torque on the bolt.

 

[rScotty]

That bolt and nyloc nut is just to keep the pin from rotating ,
the nyloc is just to keep the bolt from falling out.
No reason for it to be any tighter it is not in a location requiring any specified torque on the bolt.

I agree. That bolt is being used as a pin, and the nyloc is serving the same purpose as a cotter pin would. No reason to tighten it.

So we solved a mystery and most of us learned a bit more about Nylock nuts. Not bad....
rScotty

 

[Big Barn]

That bolt and nyloc nut is just to keep the pin from rotating ,
the nyloc is just to keep the bolt from falling out.
No reason for it to be any tighter it is not in a location requiring any specified torque on the bolt.

Agreed. If you had posted this photo earlier your mystery would have been solved.

As mentioned a cotter pinned bolt is also used or a spring roll pin.

 

[Frankenkubota]

That bolt and nyloc nut is just to keep the pin from rotating ,
the nyloc is just to keep the bolt from falling out.
No reason for it to be any tighter it is not in a location requiring any specified torque on the bolt.

Thx

That痴 kinda what I thought when I posted the question.

Which brings me back to the original question.

I assume Kubota speced implement attachment hardware and fasteners. I also assume the Kubota engineers had a good reason to spec bolts and nylenuts but.........why?

Again, I don稚 care and I知 not being critical, I知 simply curious why not a simple hardened pin with a clip? That would be cheaper, faster and I wouldn稚 be looking for the nylanut that fell off.

Not important, don稚 care, Just curious!

 

[rScotty]

I'm guessing the one that is missing was never there to start with. As for the "why", go to McMaster and it looks like the price of pkgs of nylocks & bolts is surprisingly less than an equal number of any kind of pins with a drilled shaft and a clip.
Engineering wise, I'd think a nylock is more secure than any kind of clip.

I'm with you on the confusing part. Most Kubotas come with separate manuals for the tractor, BH, and Loader where a simple line of explanation - or even a "looseness spec" in some chart a nice gesture. All in all, there seems to be a lot that the manufacturers could learn from TBN if they only would.
rScotty

 

[dragoneggs]

Finally got some seat time in and thought about this thread. Found at least 6 threaded pins with Nyloc nuts on the FEL. All were attached and with a fair amount of gap. At least one looks like there is no thread protrusion. Will have to inspect them all next time out, and tighten as necessary. If I do have to tighten them, I will put on some blue loctite.

 

[Cougsfan]

My guess is the one you had that fell off was never tightened into the nylon in the first place. Why didn't they use another method to secure the pin? Because bolts and nylon lock nuts are a great way of securing that pin (if done properly). I would prefer this method over roll pins, castle nuts with cotter pins, double nutting, locktite, smashing threads, lynch pins, or any method I could think of that would be used an alternative.

 

[dragoneggs]

My guess is the one you had that fell off was never tightened into the nylon in the first place. Why didn't they use another method to secure the pin? Because bolts and nylon lock nuts are a great way of securing that pin (if done properly). I would prefer this method over roll pins, castle nuts with cotter pins, double nutting, locktite, smashing threads, lynch pins, or any method I could think of that would be used an alternative.

Not me! And I am saying this while my business is centered around plastic aerospace fasteners.

Nylocs are a sexy locking fastener and I use them a lot. But they are not as capable in high vibration, heat, or chemical environments. And a combination of environments makes these poor. That said... good enough for your tractor... absolutely!

 

[rangerfredbob]

I will also add that you should not add loctite to nyloc nuts! Loctite melts nylon...

 

[Big Barn]

I will also add that you should not add loctite to nyloc nuts! Loctite melts nylon...

Now that is interesting. I realize Locktite should be used sparingly but good to know for when working around plastic assemblies.

 

[dragoneggs]

I will also add that you should not add loctite to nyloc nuts! Loctite melts nylon...

At this point if the nyloc isn't holding, I don't care about the nylon. I need the threads locked.