Lock Washer & Lock Nut Vibration Test
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- เผยแพร่เมื่อ 1 มิ.ย. 2024
- How good are lock washers and lock nuts against extreme vibration? Find out in this video where a DIY setup is used to put them to the test.
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This video is for entertainment purposes. Follow the manufacturer's specifications for torquing or loading bolts for your specific application. - แนวปฏิบัติและการใช้ชีวิต
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Here's the follow-up video where Loctite threadlocker is put to the vibration test... th-cam.com/video/lwtUWB2TIYA/w-d-xo.html
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Have you tested the Nord-Lock Wedge-Locking Washers? Those seem promising as far as their promotional videos show at least.
Experience over 45 years: they all work to some extent at REDUCING loosening. But the only lock device that categorically prevents it is a castle nut & split pin.
The aircraft industry trust their twisted safety wires just as much as a castle nut.
I agree,I believe as a 39 yr tech that a castellated nut and cotter key to be the best.
What about loctite?
Damn, where did I put those cutting disks for my Dremel!
Stage 8 locking fasteners as well where a castelated nut and cotter pin combo cant be used
Na just weld the nut. Fuck it
I work in the aerospace field and this is exactly why we always use lockwire (safety wire) for aircraft applications. Even with torque specs applied, they can break loose.
I was about to say this. A good lockwire application is a great way to prevent vibration loosening, as far as I see. With my limited knowledge, I only see creep or fatigue as potential problems.
Preload is the key to a successful joint. Lockwire (like a castellated nut) is really only intended for dynamic joints. In the case of a structural joint that is for whatever reason is overloaded, lockwire does not prevent failure…… it simply becomes a lanyard to retain the bolt head that pops off.
Hex head bolts are sometimes wired together on production machinery too. I've come across these several times.
Surprisingly car wheel nuts all are conical without any washer at all, & they proven last for many miles or even years, no issues...
@@jstwatchnread8420 The question is that, how much vibration are they subjected to?
For example, jet engines and rocket engines are told as vibration monsters. And this video shows how vibrations can loosen fasteners.
Are non-racing car nuts also subjected to problematic amounts of vibrations?
Would have been nice to include Loctite threadlock (red & blue) to the experiment.
Yep, when you want to be sure you use loctite - orange is good stuff
+1 for locktite and it would be nice to check locking-wire.
Next video hopefully
Looking forward for the next test.🎉
Locktite would pass espocially if you use high or medium strength
I want the nuts holding the rig together 😂
LOL!
I tighten those nylocs between tests. 😎
I was an active duty sailor "Opticalman" back int he late 70's. I worked on a sub tender, pulling, repairing, and installing submarine periscopes. One of the more grueling aspects of the removal/install process was dealing with the large (3/4" thread?) nylock nuts that clamped the lower seal complex to the submarine inner hull. There were a lot of them - I seem to remember 12 or 16, the nut prevailing torque had to be greater than 15 pound/ft or you replaced with a new one, and they were way up in the overhead in a mass of pipes and cables. Used a collection of cut-off wrenches, pull bars, crowsfeet, sockets. The first few were OK but you get tired working up in the maze, hanging over the periscope well. Every turn of the nut required force, and many times it was a 1/12 turn using a 6" long cut-off wrench, flipping it every turn. Literally thousands of manipulations. Especially nasty was the install torque to value - around a 115 ft/pounds. And if with a crowsfoot, more force on the pull bar. All being watched (but not helped) by the sub's sailor assigned for QC.
I don't know what was used before Nylocs. I imagine it was some kind of split washer system. That would make the nut running up and down FAR easier.
Thanks for your service! Appreciate you sharing your experience. 😎
Now that's some gruntwork a Marine respects. :) Thanks for keeping the rust-buckets afloat, my salty compadre.
Thank the Brits. Simmonds invented what we now know as the Nylock knock off by Abbotts
Generally castlated nuts with a split pin, think ball joints, or wire tied nuts which are still used in aircraft today.
@@scroungasworkshop4663 Right, safety wired or castellated nuts were probably used. In fact, in my dusty 45 year old memory banks, I kind of remember seeing some big castellated nuts in the Periscope Shop storage area.
Nice job.. You should do another one and consider taking your top three and add NORD lock washer which is supposed to be the best in the business. You should also do a grand finale using red loctite.👍
Nord-Lock washers are great, held every time I've used them!
I can confirm that nord lock washers are absolutely insane! It took more force to loosen than I used to tighten them.
The only thing I'm not a fan of is how difficult they can be to acquire and how infrequently they're used.
Excellent test! The split washer and nylock performed exactly as I expected.
I would be interested to see the difference between fine threads and coarse threads. Theoretically, find threads are much more resistant to vibration due to the lower angle of the threads. Like a wedge-shaped door stop that is made with too low of an angle can be wedged into a door super tight.
Thanks! Good idea! I just might test finer threads. Working on vibration testing threadlocker right now. 😎
It would be very interesting to see how the nordlock washers would give for results. They are supposed to be some of the best in the world.
we use them at work, along with blue loctite. torque it down to 160Nm for M10 bolts iirc. Never had an issue with them
Nice experiment!
Thanks! Appreciate it!
Wow, super interesting! I wasn’t surprised by the split washer, they’re my go-to. The Nylok was a big surprise though, and especially the check-nut (!)
Thanks! What are your thoughts on threadlockers? That's what I'm testing next. 😎
Project Farm 2.0? This is great stuff. Keep the videos coming.
This is the best test of nut retention I've seen. Thanks for sharing your results.
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Thanks. Very interesting. Would also be interesting to see regular nut with blue/ red Locktite.
Thanks! Working on it. Taking a long time because I need to wait 24 hours between each test to allow the threadlocker to cure. 😎
Congratulations sir
You are a scientist
Great video!
LOL! Thanks!
I’m just a guy with time on my hands to goof around in the garage.
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Excellent test!! I had an issue with a 75hp Evinrude e-tec outboard motor.
I had some work done on it, replacing a power cable due to saltwater ingress near the battery.
Thereafter I had trouble starting it, just not enough power getting through.
I kept saying there was something wrong, they said that I didn't use the motor enough. This went on for a couple of years.
Eventually I looked at it and they had used '2' of the internal lock washers on the Solenoid!!! Not enough power was getting through.
They SAID that this is the Evinrude specification. I removed both internal tooth washers, put a flat washer on the inside of the post, a nylon lock washer on the outside.
In the 4 years since the motor starts 1st time every time and the lock nut hasn't moved.
I finally feel vindicated. The connection is more secure and sufficient power gets the the solenoid to do it's job. Thank you.
Great story! Thanks for sharing! 👍😎
From my experience, the single split lock washer seems to work the best as long as it can bite into the material below and the nut above and it's usually the cheapest option too!!!😁👍🏻
I was surprised that the split lock washer tested so well after reading several negative articles about them. 😎
That is why good split lock washers are made of much harder steel than the regular washers and nuts they are meant to penetrate and lock together. In some applications the lock nuts are also considered as single use items as their edges get dull and the nut itself gets deformed after it is tightened and does no longer generate as much holding force as the first time.
Fantastic testing method, with some surprising results. Especially how quickly the double nut failed.
Thanks! I’m testing threadlocker next. 😎
Very very interesting... thanks for the good work putting this video together. Now for the elephant in the room.... WHATS HOLDING THE NUTS ON THE TEST RIG TOGETHER :)
I will suggest that jam nuts need to be closer to yield in order to stay jammed.
Further suggest using a different method for the jam nuts:
1) Apply the required torque with the first nut. First nut should be the full nut. My sources disagree with your sources (name yours and I'll name mine:) )
2) Jam the second nut at max torque allowed for the bolt, rod, stud, or shaft (while not allowing the first nut to turn and this may be much higher torque than allowed for the first nut). The jam nut does not need to be a low profile nut: it can be full.
3) I am not suggesting that clamping force will be unaffected by the second nut.
interesting points
yeah same here, I've never heard of putting the jam nut on first. That makes no sense to me.
I installed a bike rack with a few split lock washer more than 4 years ago, keeps solid af. 🙌
Nylocs are used on the shaft of the washing machines. So not a surprise for me😂
you could simply tie them up with wire, as Ignacio Copani would say :P
When I read reviews on Amazon about hitch carriers and other devices that people complain about things coming loose, I immediately by nylon, threaded nuts, and also use liquid thread lock
Thanks for this interesting test video! I have found that Nylock and Metalock (like your Top Lock) are almost 100% effective because no matter how much the bolt loosens they will not freely spin off the fastener. Cotter pins are almost as good, however they can shear off, allowing the nut to freely unscrew with no warning. When the Nylock or Metalock are loosening by accident, they do so gradually so that the parts become gradually looser, allowing noise and vibration to build with time; thereby giving the operator time to stop the machine before it becomes catastrophic.
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Now this is very useful testing. Thank you.
Well done.
Wonderful, very helpful for me to pick out the strongest nut.
Well...I would have never guessed that. Thanks!
Where a lot of people go wrong, is using a flat washer under a locking washer. Preventing the locking washer from griping to both surfaces. The flat washer starts to slip first allowing the nut to loosen. Also I have also seen bolts wired incorrectly, where the wire tension is placed in the wrong direction allowing the bolt to loosen a few degrees.. I don't expect red loctite to do well in this rig, red loctite is brittle when dry fully and can be broken with impact.( a hit with a hammer )
This is why I love TH-cam! I had same question and someone did the experiments. Love it.
This taught me that it doesn't matter if i tightened it month ago or longer thats why i need to check it
Thank you. This helps with my future lock nut selection. I like Nylocks.
You are doing awesome job with the vibration test jig
I don't know why but the way the parts flew was hilarious to me
Lock washer is worth using. Thank you for your video. I will now use the lock washer with the solar panels stands
Nordlock two piece lock-washers are by far the best lock-washers I’ve seen. Try them once and you will be shocked at the torque it takes to break them loose.
Thanks! I've got them on my list.
This is super interesting. Thanks for making this!!
thank you for your video!
This is an amazing test I NEVER expected those results. Gonna watch the video again! Excellent job well done, thank you!
Thanks! Much appreciated!
Love learning something new... I did not expect the toothed versions to perform so much worse than a plain nut
one thing i would add to the test is the re-tightening of the nut after the first thirty seconds.
Nord-lock lock washers for the win!
Very informative and short. I like your video.
Very impressive!
good comparison
I'm still looking forward to your vibration test for Loctite, etc.
A observation: I'm sure that your vibration rig provides a significant shock component, which is not particularly realistic in most applications.
Thanks!
Yeah... it wasn't meant as a real-world test. It's more of an overkill test for entertainment. If anything, the survivors will more likely perform well in real-world conditions.
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I think you will find, as the tightening torque increases, the game changes.
Higher tensile fasteners and higher tightening torques change the game in several ways.
Toothed fasteners and spring washers fail earlier as both the hardness of the metal and the tightening torque increses.
Plain fasteners hold better as the tightening torque increases.
Finer thread pitches increase available fastener tension and friction.
one of my favorite combinations is a high tensile bolt , nut and washers backed up by a nyloc nut as a lock nut.
Thanks! I'm saving my pennies so I can redo the test with grade 5 fasteners and higher torques. 😎
So good! Concise, repeatable, and informative 😸 thank you for sharing your findings!
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Interesting. Adrian Steel used serrated flange nuts on their truck shelf assemblies for years, I have had little trouble with them walking loose after years and many miles. Still, around 5 years ago they went to nylon inserts.
You confirmed my suspicion that the split lock washer is better than the internal star lock washer when it is between a flat washer and the nut. Thank you. Great video!
Thanks for the feedback! Much appreciated!
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Thank you for this video. It's so simple but so informative!
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Thank you for this experiment. The problem with the top lock nut is its single use application. Tests have shown the Simmonds style nylock can be used 15 times without loss of integrity
Thanks! I'll look them up and see if I can find a supplier. I'll test them if not too expensive.
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Thanks for sharing!
You're welcome!
Really interesting experiment! I’ve called the split-lock washer just a lock washer. Glad this demo did not force me to change my go-to washer.
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Thank you!!! Extremely helpful!!!!
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Excellent video
Thanks!
They have some other purposes also. It's not only for holding a bolt. If you use for example a softer material with bolts, you will need a spring washer because you can't tighten it like you would with steel. The one with teeth is good if you want to prevent the bolt from sliping as you tighten it. They're good for many things.
Your curosity and mine, great video and idea.
Very interesting. This is the kind of experimentation that built the world!
Thanks!
Great video, thank-you.
This echos my practical experience over the last 50 years. I have used locking nuts on machinery, railway track-work and classic (vibrating) motorcycles. My go-to nut is the Nyloc but the top lock nut is a close second choice. I have only used the split lock washer for budget applications and am pleasantly surprised how well it performed.
The top lock and nylock are the best ones to use unless its a stage 8 locking fastener or a castle nut and cotter pin
Split washer with nylox nut. Got it. Thanks
Thanks, very interesting tests.
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Came for the threadlock test videos but loved this one; surprised by the outcome.
Trained in science, I like your test methodology.
Just subscribed and checked out your Amazon link...
Thanks! Your feedback is much appreciated!
I’m running a threadlocker vibration test and will post it in the coming weeks. Stay tuned…
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Very informative and simple
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Thanks. This was very informative and interesting. But I still don't know why, but Thanks
this is great test
thank you
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Love to see lock tite used and nordlock lock washers also
Rust is an excellent thread locking compound. I've also had a good amount of success with nord-locks.
Very interesting, Thanks for the info.
You’re welcome! This was a fun experiment. More to come. 😎
Thanks for making the video. Interesting methodology. You got a lot of responses curious about "what if?".
It looks to me like the real winner, hands down, is the fasteners holding your jig together through ALL the testing!
Just kidding......sort of. My experience tells me that if the design of the joint allows for enough torque, then you don't need lock washers. Lug nuts, connecting rod big ends. But of course there is not always the option to design joints to allow that much torque. My experience with split washers is that they will spread open before you get to enough torque.
LOL! The bolts holding the rig together experience a less intense axial load versus the more intense transverse load that the jig experiences. As far as torque... these were low-grade nuts and bolts that can't handle too much torque. I plan to conduct a future test with grade 5 fasteners and more torque. 😎
Amazing video .. Its useful and cery clear
Thanks... glad you liked it! 😎
Thanks.
Would have been nice to see how things moved in refence to bolt,washer, nut.
Great video!
Thanks!
That's very interesting, the test is BRUTAL, like, not just vibration, but downright impact loads on the system, but it does indeed make a lot of sense when you're just trying to losen up the system as fast as possible. Kinda surprised about some of the bad results tho, this begs the question of whether they have different applications that would benefit more on their construction, like the ones that bite into the metal being more suited to softer materials or such.
One that would have been very interesting to compare is a normal nut, with red thread-lock added.
@@RobMrowiec Interesting, I don't know the correct torque values without a look up table so wouldn't know it (specially imperial), good to know, I imagine this has affected quite a bit the results then. Probably some of the biting types would have more of an effect that way, even tho they already left quite the marks on the metal.
Interesting experiments, thanks for sharing 👍.
You're welcome!
Thanks for doing this test; I've been looking forward to it. Surprised the split washer did so well but I'd be worried about the damage it did to the surfaces. I'd love to see a showdown of the three survivors (Nyloc, split washer and top lock) where they are left vibrating for a long time. My feeling is that the split washer would be the next to go, but I'd be very interested which one between the Nyloc and top lock does better after prolonged vibration. Judging by this current test, it'd be the top lock (which are new to me; I hadn't heard of them until today).
You're welcome and thanks for the suggestion. I'll add it to my list. I'm thinking of doing the vibration test with blue and red threadlockers.
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@@HacksbyDad There's some locking washers called 'Nord-Lock' that look interesting, but all the tests I've seen on TH-cam are either by Nord-Lock or someone who sells them.
@@balicrimechannel8143 Yeah... I've seen their videos and some others. I purchased and tested what I could get from my local home improvement stores.
My bet is that no washer and opinionated tight - the M.A.N. method - will win. When that manufacturer puts a washer there it is in my experience with their printing presses to ensure that you can take it apart.
If you:
1) keep the split-rings away from galvanized steel, and
2) replace both nut and washer each time you unscrew the nut, then
result: the damage caused by the split-ring doesn't matter.
Nuts & washers & etc. are consumables, so you should feel comfortable replacing them whenever you unscrew them. So long as you don't have _another_ reason to care about surface damage (e.g. corrosive conditions are a reason to care), and are willing to use a washer to protect the surface of the part, split-rings should be considered a good option. In those cases where you _can't_ use a split-ring, a plastic-filled locknut should probably be your default.
great job.
Thanks a million🤔
👍😎
Nordlock washers is the best that I know of. They are used on drilling equipment in the oil-industry, on cranes and so on.
iirc the internal tooth lock washer, keep nut, and serrated flange nut are designed to not use a washer so they can bite into the softer metal they are clamping. Like cast iron or aluminum.
If you can swing it, can you set up a separate jig no washer into cast iron or aluminum? Or even a softer steel.
All in all great video and great testing!
I’ve noticed some Chinese manufactured nylok nuts have an extremely narrow band of nylon that barely grab a single thread.
Very useful!
Thanks!
I'm surprised the nyloc moved at all. I've replaced a few of my old 2 strokes nuts and bolts. The thing vibrates anything off, but anything replaced with nyloc's haven't budged in forever
One big reason for using nylon locking nuts is not so much to avoid them loosening, as to avoid the nuts falling off and causing havoc. So for example, you could have a panel secured by twelve bolts (for redundancy) but one of them comes loose (expected, which is why you have the redundancy) but if it or the bolt falls right off it would e.g. end up wrecking a turbine. A nylon lock nut will keep things together until the next inspection.
Great info. Was I surprised when I Went to Dylan Mulvaney's house for a party yesterday and in under 15 seconds the nuts were flying everywhere!
Excellent video. I have always wanted to test many of these as well. I liked the test set-up. I thought it was very clever. I have always liked using the flange nut for surface area, but it did not do very well in this test. They do, however, bite into the painted surfaces very well since they do not require a washer so I am still mixed on the performance of these. Thanks for sharing this!
Thank you! 👍😎
I feel line a flange holds up very well but require a lot of torque normally to do their job. In my experience though lock washers are a favorite with supplies being more common do it is nice to see it do well. As far as nylon nuts though in my personal experience I see them fail often. Like they do a great job at staying on but once they are loose it’s toast and they are a pain to get back off.
The flat serrated washer from Snorr is a good option, you can also put 2 on-top of each other
This is a great test. Our big swarf conveyors on machine tools have the scrapers attached to the chain links using jam nuts. However the jam nuts have cuts made across them with a saw which I guess helps the main nut bite into them.
Lockwire is the way to go though. Or Nordlock washers. All depends on the application
We've tried all types of locking fasteners on the conveyor flights (scrapers) to keep them attached. Over time they all work themselves loose and a flight will turn sideways jamming the conveyor and often bending it and other things in the process. Really sucks when it knocks the entire chain out of the guides on that side turning the entire thing into a giant pretzel. Short of deforming the exposed threads, welding, or wire/pinning, all types come loose. That's why most OEM's rivet the flights onto the chains. The downside is if the conveyor chains come out of the guides and jams up, I have to remove a number of flights to get get everything unbound. I can work an Allen wrench and combo wrench underneath coolant to accomplish this with nuts/bolts. If there's still original rivets, smashed threads, etc., you can't really run a cut-off wheel under water requiring you to pull the conveyor or drain the sump so we prefer to use a bolt/locknut. I've found the deformed nut style of locknut to be better than Nyloc's as the synthetic coolant we use degrades all types of plastic over time.
Thank you very much for doing this testing. I now have much more confidence in split lock washers. It's important to not reuse them. For that extra bit of security you can always use Loctite on the threads. Even the green wicking type is beneficial.
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great, I would be interested to see the performance of Nordlock washers, I think their wedging effect provides the best vibration resistance
Perfect!!!!!!
Couple things. The internal toothe washer and keep lock nut designs are not to keep a bolt from loosening but are meant to ground electrical connections. The teeth are meant to cut throught paint or other surface finishes, equaly true for the external tooth washers.
Torque means nothing if you're not lubricating the threads. F (friction) factors vary greatly from the screw to screw even from the same batch. You can apply X torque to 3 of the exact same hardware and not obtain the same clamping force because F vary on each.
Direct from the head engineer at Fastenal US, split washers are worthless. Told our engineer dep, they only still sell them because people just refuse to learn.
Bellville washers (to keep tension on the bolt assembly during thermal expansion) and Nyloc nuts are the way to go with common assembly applications.
For anything with vibration, Loctite, Nord lock washers and Nyloc nuts.
Thanks! If they are for electrical connections… I guess they shouldn’t call them “lock” washers and nuts. LOL
I was surprised how well the split lock washers did after reading how useless they are. 🤷🏻♂️
@@HacksbyDad very true our rep said the same thing, unfortunately that's a very common problem as companies use terms interchangeably just to sell more product and confuse the public.
Great test procedure!! Thank you! Now ...question. Best/optimum washer arrangement for a manual tightening function that will SELF-restrain bolt head while tightening the knob or nut side by hand???? (note: this is a bolt that must slide in a slot, for adjustments---so bolt head can NOT be glued down, or otherwise restrained!!) For shop work/applications. Also, an aside ... was cropduster in Bull Stearmans for 10 years ... ALL critical nut/bolt connections were secured by 'safety wire' (locking wire) and castlenuts. Don't recall a single failure!!! Was generally extreme vibration environment.
simple stuff, love this shit, thankyou
this video needs to be mandatory for all vehicles mechanics under trainee/apprenticeships, especially in aircraft maintenance
I like the rusted nut and bolt method my self : )
Interesting test. However, not sure there are many applications in the real world, nor is there a nationally recognized standard that says to tests fasteners using this method. Fasteners are typically designed to bolt stuff together, not vibrate like what is shown in this test. IMHO, a Junkers Test (Ref: Junker, G (1969). "New Criteria for Self-Loosening of Fasteners Under Vibration". SAE Transactions. 78: 314-335), which is a mechanical test to determine the point at which a bolted joint loses its preload when subjected to shear loading caused by transverse vibration. There are YT videos that show most methods of fastening devices will fail the Junkers Test unless special washers are used (e.g., Nord Lock Washers), safety wire, loctite, or similar is used.
Thanks!
This was nowhere near real world. Just a fun extreme impact vibration test. I saw a junker video about a year ago but just couldn't figure out a DIY setup. Then I saw this video... th-cam.com/video/c7UIDyHdlLA/w-d-xo.html
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The last one you used, "top lock nut" or as I know them "stover nuts", are the main ones we use for in HD equipment we work on.
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I swear you answer questions i have like a day after I think about them.
If you're thinking of the same questions as me... you've got a serious problem! LOL 😎
@@HacksbyDad hahaha, I’ve known that for a while.
i would like the split lock washer retested on a setup where the large flat washer is not keyed to the bolt. i have found that in a lot of cases a split lock washer is used on top of a flat washer and would result in the assembly coming off sooner than your test shows.
Great test. Your set up rivals Project Farm. 👍
Thanks! I'm just grinding it out and having fun at the same time.
I had a locktite rep tell us that the lock washer was invented by a person named lock.
But without watching the vid the nylocs and the spring locks will work best.