Nord-Lock Wedge-Locking Washers - Junker Vibration Test

The Junker vibration test, according to DIN 65151, is considered the most severe vibration test for bolted connections. In this video, we compare the performance of Nord-Lock washers with other locking methods.
Nord-Lock wedge-locking washers prevent bolts loosening by securing bolted joints with tension instead of friction. It is a high-quality product with documented success in many industries worldwide. Nord-Lock safety lock washers have been rigorously tested and approved by independent institutes as well as certification authorities.
Find out more about Nord-Lock washers:
www.nord-lock.com/nord-lock/p...
View Nord-Lock washers dimensions and CAD files:
www.nord-lock.com/cad
Related:
How does Nord-Lock washers work?
• How Does the Nord-Lock...
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Nord-Lock Group is a global leader in engineering and bolting technologies. We have decades of experience in solving industry-specific challenges successfully around the world and you can rely on us to solve yours.
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Website: www.nord-lock.com
Blog: www.bolted.com
LinkedIn: / nordlockgroup
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[@TheCh4s3]

Imagine if all adverts were this informative and engaging. Congratulations Nord Lock, next time I go and buy washers I’ll be going to a supplier that stocks these - me and I presume most of the others who watched this ad.

[@mikebrierley9032]

Can honestly say this was the best pop up add I've seen in a long while. I'm not not huge purchaser of washers as a general rule but nonetheless this little ad/film has been really well put together & is a fascinating insight to what must be a huge problem for industry. Who would have thunk it, that an advert about washers could be so engaging, I'm glad I didn't just hit the skip button, Nord washers rock, or don't move at all more to the point ! ;-)

[@olenilsen4660]

Thunk? Did you mean thought? Sorry, not trying to be mean, I just read your comment and had to look again and see if I`d thunk wrong.

[@zabzabatour7799]

Thank you. This video saves considerable time in arguments with other engineers.

[@0326Hambone]

VERY impressive! I also like how the video erred on the side of education, opposed to publicity.

[@andrewl9180]

Selling to engineers...

[@KrishanGopal-hg8cf]

Andrew L

[@rva485]

Nick

[@nathanwest2304]

true you can't simply advertise to engineers with promises, they need cold hard facts

[@NadeemKhan-cg9mo]

@@KrishanGopal-hg8cf c ,c " DC

[@666clement666]

Very good washers ! I have been working with them for years on big turbochargers installed on maritime engines. They have never failed !

[@olenilsen4660]

Love that you can approve! I´ve known about these for some time, but never got around to it. Do you feel they are worth the price everywhere?

[@spurcrawler249]

I’ve been lied to my entire life. This is amazing!

[@shavedape777]

This is nuts!

[@-Meatwad]

no this is Patrick!

[@johnosaurus7400]

Ha...

[@stertheder]

+shavedape777 You sure hit the nail on the head with that comment! :P

[@alwaysFlOoReD]

+shavedape777 No...no, this is washers.

[@cartilige]

Just seen this video as an advert in another video, and it was captivating. I chose to sit and watch the advert rather than the video it was on. I've been using Nord-Lock washers for several years now, knowing that they are superior but never had an explanation of the physics that makes them so. Thank you Nord-Lock for this highly educational advertisement.

[@ambiey5018]

Who ever made this video is top notch.

[@c0mputer]

Well I'm sold. I'm welding every nut.

[@cr0sh]

A small spot weld, between the nut and the bolt thread, would probably be very secure, but getting that nut back off again would be a pain (you'd probably have to cut the end of the bolt off, then use a breaker bar and socket, or an impact driver, to reverse the nut past the damage). An untested option would be to take a cold chisel and distort the threads next to the properly torqued nut. It likely wouldn't back off as much under vibration, but if you had to remove it, the nut could reform the threads (of course, you'd want to pitch the bolt and nut afterward).

[@alphaomega8373]

lol

[@ironsaint]

Welds can break.

[@flinch622]

It's all a risk vs. time consideration. If your needs are short term, no problem. Weld nut to bolt, and at some point fretting is going to cause loss of clamping force - you won't know about it, because the weld prevents checking torque [common maintenance]. Next thing you know, holes are going egg shaped and the next step is broken bolts. I bet they wish they had this style washer around for the Hueys used back in the day - those helicopters used to drop something almost every time they landed/took off.

[@NadeemKhan-cg9mo]

@@cr0sh c hc ,c c v z" c ,f cc c ","" c v c c " f c c SCC c c c v c c c c v,c" c ,c",",",," c c f CSX c x c c

[@YusufSheth]

Great exploration of the topic.

[@livingaboard]

I think this video shows the possibility of loosening but it was tested at a certain frequency and amplitude in order to get the nuts to vibrate to loosen. Many applications may never experience the frequency and amplitide necessary to loosen any of the methods tested. I build commercial aircraft and we don't have issues with nuts loosening up when they are properly torqued using lock washers, lock nuts etc. Also flight critical items will be lock wired which is often seen on hydraulic and engine components. I have also never experienced any nuts or bolts loosening up on any of my vehicles after driving decades and hundreds of thousands of miles. Again, my vehicle isn't experiencing the test vibration frequency or amplitude shown here.

[@fredfred4086]

You obviously haven't driven over thousands of kilometres of gravel/dirt roads with corrugations on them.

[@angelobreda-pelet]

really a perfect locking washer! congratulations!

[@MevaraMevlana]

I like your video explaining some type of washers under vibration...nice to know it

[@BiggestNano]

I'm not sure how I ended up here but I think this makes me smart.

[@januzi2]

Getting smarter every day, eh? ;)

[@Backtrap1943]

it only makes you smart if you apply it from now on to all ur nuts. Bust a nut!

[@brucewilliams6292]

Very good video. I like the approach to the subject. Thank you so much.

[@thermionicemission6355]

Oh shit, that's really clever! Simple yet great.

[@NoNonsenseKnowHow]

Excellent product! Wish I knew about these years ago.

[@_itis8809]

really? my bike from 1995 has these - originally...

[@srcnormal]

Just watched Smeedia talking about using these for his cam gears and had to check it out! Pretty cool!

[@albertojosedanielssoncaram6826]

Very good video....absolutely clear explanations!

[@arivo9062]

Looking forward to feature this products in our latest innovation

[@DeadlyDiddly]

Looks like a brilliant solution!

[@FrequencyOfThought]

I will be finding these fasteners for racing applications

[@powsinwosin6808]

The music is so intense , gotta keep those nuts safe, man I'm not even involved in any engineering stuff or even have a hard time driving a simple nail to a wood

[@pepecadierno]

Impresionante, no había visto nunca sistema como este para medir los efectos de las vibraciones.

[@justandy333]

This was very surprising, At my work we use Nylon insert nuts all the time and its quite worrying to see just how bad they performed on the test. Very tempted to look into using Nord lock. Ultimately it comes down to cost. I just checked a site we use to buy our fasteners from. When buying lots of 1000 A standard m12 washer is £0.13. and a m12 nylock is £0.31. So a total of £0.44. Compared to Nord lock, coming in a £1.84. So 4 times the cost it would seem. I think for critical appilcations this is well worth it.

[@Mtaalas]

If skimping on few pennies is more important and productive than making sure things never fail.... I don't really see this mindset myself. :/

[@tituswilm477]

Partially the locking performance relies on the "softness" of bolt head and part surface. Are there any test results that show the locking performance with 12.9 class bolts used on hardened surfaces i. e. bearing rings with 62 - 65 HRC surface hardness?

[@NordLockGroup]

Our washers are working perfectly together with 12.9 bolts and we have several tests showing that. If you would like to see a test report, please contact your closest Nord-Lock office or [e-mail]. There is a general rule when using Nord-Lock washers which says that mating surfaces need to have lower hardness than the Nord-Lock washers. For steel washers this means a hardness lower than 465HV1. This corresponds approximately to 46-47 HRC. Hardened Bearing rings with 60-65HRC are therefore too hard for a successful use.

[@valiantfreak]

These are absolutely fantastic for a turbo car's exhaust manifold.

[@KaiForce]

just ordered some of these nord lock washers for my turbo flange after noticing all the nylon nuts coming loose. Nylon nuts lasted about 25k miles, hoping these last a lot longer! According to the graphs they should...

[@prashantkalasapur8145]

Very good advice for electronics su systems industrial units.

[@cnknguyen]

This was a very eye opening presentation. Im in military aviation and this system looks very useful on smaller parts on our aircraft. Would it be too much to ask to get a junkers test of a lockwired bolt series? I have a community that is interested in the results. Thank you!

[@NordLockGroup]

Thank you for the comment! Will you kindly drop us an email at [e-mail] to explore the possibility of the requested test.

[@2slofouru]

I'm fairly certain it would have no effect if the lockwire had the correct number of twists and correct gauge.

[@Gameboygenius]

The lockwired bolts will do just fine. The "complaint" about lockwired bolts is not that they're unsafe but that they take skill and time to install correctly. With these washers, all you need to do is orient them correctly and then torque them down.

[@rob5631]

@@Gameboygenius bingo

[@moynihanigan]

They did: kzbin.info/www/bejne/fYvRd397j62Vf8ksi=9S8n-fmYtb68x8VR

[@ryoder6279]

Great video!!!

[@louisrichards3702]

i noticed they didnt try a all metal grade 8 lock nut,how would that do in a test???? i have used these all metal ones in engines holding rocker arms in place, never had one move..

[@uiopuiop3472]

NOW I CAN NOT LOOK AWAY. I NEED THE NEWEST IN WASHERS TECHNOLOGY

[@sohan2510]

Will nord lock washer work on hot surface ? The surface may reach upto 180° celcious.

[@truthseeker8483]

Two nylon insert nuts works well...Great washers! Excellent design!

[@magnusklahr8190]

It is a great system. Use it alot!👍

[@adbilahsan5286]

thank you very much

[@adisharr]

I've been using Nylock nuts for years and it seems they perform well in many circumstances. Nothing seems to come close to the Nord lock system though.

[@EvertonTobar]

Have you tried Loctite?

[@AdilAaronAkhtar]

@@EvertonTobar Loctite has temperature limitations, even with the high temp variant. at what temperature do you think these would fail haha

[@zabilbakhshaliyev1783]

Hello guys .Can someone explain what is run on torque for self locking nuts and what is breake away torque ?

[@Iankmuin]

nice video

[@user-nh8tc9po2l]

is it only use lower bolt head und under nuts or is it possible installed between two bodies to prevent the rotation between the two bodies two?

[@DR0CK]

Did you replace the washers on the vibration machine for the junker test? ;)

[@robertogifuni7504]

Excellent idea and great video. Congratulations Nord-Lock!

[@antoniokokic7488]

This is amazing!

[@dansingleton7689]

Do you have a similar test using Belleville style washers? Curious how they stack up in there.

[@WLeesh]

How you measure clamping force?

[@funkyMRI]

I recently bought a Taurus Chin-up bar, which was delivered with split washers. Just ordered Nord Lock online to replace them. It fascinates me that this video demonstrates the split washer in a different light from many other sources online, for example: Bolt Science. I'm guessing that either the testing procedure is different or that you ran multiple tests for improved accuracy (no standard deviation visible in the graph). I'm also not sure if the baseline is comparable.

[@NordLockGroup]

Thank you for ordering Nord-Lock washers Daniel! We hope you are satisfied! We did see the Junker video from Bolt Science and the result for Helical Spring washer (split washer) is similar in both videos: both videos show that the locking performance is not enough.

[@ridinginthepnw1357]

Was the nyloc nut used properly in that test? My understanding is that it needs more threading past the nylon to secure properly.

[@joshuabettiol6986]

it only requires 2-3 threads exposed past the nylon insert

[@ridinginthepnw1357]

+Joshua Bettiol thanks

[@Brantel.]

@@joshuabettiol6986 Depends on the shape of the end of the bolt. This one obviosly has some tapper or roundness on the end. This test did not have 2-3 full threads past the insert.

[@EddieKM]

Can you use a split-lock washer with a nylon insert nut?

[@AlphatecEngineering]

Very interesting video

[@awautoworks4426]

I currently have exhaust nuts backing out of my downpipe to turbo application. I've been fighting this for months. I'm going to pick up some of these nord washers and further reply back to this comment, thanks.

[@mckenziekeith7434]

Any updates?

[@awautoworks4426]

@@mckenziekeith7434 used Nord lock washers, and titanium bolts, still backed out. Sold the car

[@mckenziekeith7434]

@@awautoworks4426 Thanks! I guess nordlock is not the solution to every problem then. Better luck with your new car.

[@awautoworks4426]

@@mckenziekeith7434 hey they did help alot, I had a custom turbo and was working on it weekly, drove me nuts. Picked up a bmw 335i, I appreciate you

[@Gw0wvl]

I've always used a adhesive 'Threadlock' to lock the nut and or bolt in place , While these do look very useful Threadlock is my number one choice when I'm Rebuilding motorbikes .

[@scwallac]

Cool video, but the ubiquitous and inexpensive star washer was conspicuously absent from this comparison.

[@adisharr]

+scwallac I suspect that wouldn't work all that well either as there is no tension effect on loosening.

[@NordLockGroup]

+adisharr The bolt securing items we have chosen for this video are the ones we most often found in the market. But we will ensure to include star washers in future testing videos!

[@moninum]

In this video watch?v=_ne19-3vkJg you can see that they are not better than a helical spring washer.

[@JAnx01]

Star washers have no effect on 8.8 bolted connections and above. High preload makes turns them into flat washers.

[@cr0sh]

I think you also need to include threadlock compounds as well (blue and red loctite brand are probably most common); I do appreciate seeing the examples given. I've always wondered how well nylocks worked; it was pretty impressive that they worked as well as they did compared to other examples. I've also known that helical-spring washers weren't that good, but the test showed that they have some effect (ie, better than nothing). I plan to investigate the Nord-Lock washers in the future (maybe with my next order from Fastenal - I doubt I can buy these at my local hardware store).

[@sphillips6357]

hi, can it be used on the clamp nuts used on a Dayton type wheel? In the mounting process the nuts sometimes need to be loosened up slightly and retightened to evenly spread the torque around the wheel so the wheel runs true. Search part number 452010C1 to see a picture of the clamp.

[@aleksandr8147]

Perfect!!!!

[@GNX157]

These washers would work great in Redmax leaf blower engines, for the cylinder head base bolts, which have a habit of loosening over time. Same for the intake manifold bolts, but they can easily be checked using a white paint marker to watch for movement. I think the cylinder head bolts would need to be slightly longer though to account for the increased stack height, to ensure proper thread engagement.

[@ahmedmosad7161]

i have seen this in Facebook short and as usual the important information is cut 😂😂 so i m glade that i didn't run and see it full in KZbin ❤❤❤❤ +and i want to know if not the friction so geometry make and additional pressure by tiding the lock like some one pushing the lock nut so keep them not rotating or i get it wrong 😅

[@OggyXXXL]

why without thread lock compound?

[@DestinLegends]

I came for the graphs.

[@aCaptAmerica]

I actually ended up printing them out and came on them as well.

[@NzoDK]

+Destin Games And stayed for the vibrations :D

[@Hyperian]

+Destin Games I came.

[@JohnJones1987]

I tried but these washers prevented me from busting a nut.

[@glinnyfelicitas7812]

I came here because this problem affected my prototype. I think this could be a great solution to the problem, however i would use a combined method for extra precaution.

[@olenaerhardt7725]

Thank you for the very informative film. But how to find torque specifications for those Nord-lock nuts? Can you recommend any link? As far as I understand this is a crucial question on all projects with different nuts.

[@NordLockGroup]

Hi Olena! Here's a link to the torque guidelines on our web page: www.nord-lock.com/nord-lock/torque-guidelines/

[@olenaerhardt7725]

@@NordLockGroup Thank you for the link, I saw it before and thought I misunderstood smth. For the bolts I need M12 it is 99Nm what is 73 Ft-lbs. My confusion about all this increased. Maybe it is on those particular nuts, but let me describe my project in more details, bcs the range on torques I currently have is between 10-50 Ft-lbs, and more likely 10-14 Ft-lbs, bcs 50 someone applied on a truck. So my project is: on 2003 Chevrolet Cavalier I'm replacing Ball Joints. Original ones were on Rivets! I removed the rivets and increased the holes to 1/2" to fit new ball joint bolts. But the question I can't find anywhere: what torque specifications do you apply on those 3 bolt (better to say nylon nuts they have), attaching the new Ball Joint to the Control Arm? In Haynes Manual it says should be an instruction sheet in a new set with Ball Joints, but mine doesn't have that instruction sheet. From Internet it looks like 10-12 or 12-14 Ft-lbs, but in one film he applied 50 Ft-lbs, though on a truck. Someone also wrote me, that he applied 40 Ft-lbs on his Chevy Cavalier (but doesn't remember for sure). I did a lot of research on Internet, nothing on that question. I also noticed that all the Ball Joints sets they sell on Amazon doesn't have those instructions on torque spec., none of my multiple questions to different sellers were answered. So I assume everyone, but me, is just guessing on those torques and that is perfectly fine with everyone but me. Quite interesting indeed.

[@NordLockGroup]

@@olenaerhardt7725 Thanks for your explanation. We have a few questions that we need to understand to be able to help. Please get in touch with us at [e-mail] Have a nice day!

[@olenaerhardt7725]

@@NordLockGroup Thank you for the attention to my problem and e-mail. I have already intense correspondence with one of your ladies, she is trying to help me. I just want to remark that any films you make about applications of Nord-lock nuts with wedge type washers will be very helpful for promoting this new product. Can it be applied mostly on big trucks and racing cars, or you can use it on usual cars? I think questions about the applications would be of tremendous interest for the technically inclined public. Thank you again for the inventing this great product.

[@echosmyth5021]

Well, what kind of washers are holding the Junker machine together???

[@dougfresh1341]

Also, the washers I got were lightly glued together. And I thought there were instructions to install with writing on top or bottom. Video didn’t clarify. I split them to figure out which way the slant had to go. Obviously us old guys can’t see too well.

[@shengjingbo8725]

Excellent

[@ashfaqjuna]

Surprising then how well wheels on cars are kept in place for years..

[@pleappleappleap]

Are Nord-Lock washers effective on nuts which are harder than the washers?

[@NordLockGroup]

No, they are not. The Nord-Lock washer has to be the hardest part so they can make the impression marks. Without the impression marks we don't have the wedge locking effect.

[@WaffleIronMan91]

Just out of curiosity, how would a distorted thread nut such as a stover nut, or a centerlock nut compare? While they still use friction to secure themselves, they are not dependent on tension between the nut and the surface to provide it.

[@NordLockGroup]

We have not tested stover nut or centerlock nut specifically, so we are unable to comment on the behavior of these items. However, we have tested other metallic prevailing nuts which use friction to secure the joint. They normally start to rotate loose when exposed to vibration. How much of the original clamp force that remains after the test varies depending on the type of prevailing nut.

[@jeffr8282]

@@NordLockGroup I was looking for this exact question to be answered. Nord-Lock washers mar the mating surface but distorted thread fasteners do not.

[@OmarEMayer]

Cuando de vibraciones se trata, hay que usar roscas de paso fino. Los ensayos parecen estar hechos sobre roscas de paso grueso. Ante las vibraciones, las roscas de paso fino se aflojan menos. Muy bien los ensayos

[@NordLockGroup]

Las arandelas Nord-Lock aseguran perfectamente las uniones atornilladas tanto en roscas de paso fino como de paso grueso. No dude en contactarnos a [e-mail] si requiere información adicional en este otro asunto.

[@mrs.o.4528]

To Nord-Lock Group. Have you had any installations on heat exchangers in high pressure and high temperature service in petroleum refineries? What was the outcome and how reliable are they for this service.

[@NordLockGroup]

Hi! Thank you for your comment. Will you kindly contact us at [e-mail] so that we can provide you the detailed information about your question? Thanks again!

[@sourabhdakare9399]

what is the frequency of loading?

[@jimsvideos7201]

Good pitch.

[@Eicles]

This is fantastic, what a great idea! I was just wondering if you could explain why the clamp load for the second test of the Nord-Lock is slightly lower than it was at the end of the previous test?

[@NordLockGroup]

Thanks for the comment! Regarding your question - after the first 20 seconds of the test and in between the 1st and 2nd test, the settlement in the joint continues. Therefore at the start of the second test the clamp load is slightly lower than at the end of the first 20 seconds. If we continue to do the test a few more times, the graph will level off when the settlement is complete. We are sure that there is no rotation of the nut by looking at the white marking and can conclude that there is not preload loss due to loosening.

[@Eicles]

Nord-Lock Group Thanks for your explanation, that makes sense. I did not realise that settlement continues following the test. I am a Mechanical Engineering student and find this product very interesting.

Wonderful

[@MrYoyojuan]

Here because of AvE

[@UnOrigionalOne]

Jonathan Maclean Cheers

[@Robbievigil]

Jonathan Maclean all of a sudden in my recommended list. Nord lock better shoot him a few pair of washers.

[@someusername121]

It's still relying on friction or else the washer would just spin off with the nut. Also missing wave washers and Belleville washers. And internal + external tooth washers.

[@andriyshapovalov8886]

Well, they don't sell those and so no the pitch intended ;)

[@JoannaPirieHill]

Why are they applying grease to the bolt?

[@dougfresh1341]

I own two Harleys. Nord-lock is gonna profit big time this payday!

[@pleappleappleap]

If the bolted connection is deliberately loosened and retightened several times, does the repeated impression of the Nord-Lock washer affect the strength of the load-bearing surface and the face of the nut?

[@NordLockGroup]

Usually the Nord-Lock washers will go down into the same impression marks in the mating surface. But the bolt or the nut as well as the Nord-Lock washers have to be replaced from time to time when loosening and re-tightening the bolted joint repeatedly.

[@ashbridgeprojects6916]

I'd like to see what a sping washer performs like once the nut has loosened up a couple of threads. It might start biting the bolt once the tips of the spring begin tilting outward axially. Maybe vibrations wouldn't loosen it any further?

[@2slofouru]

It's a clever design, but how does it affect the initial torque setting of the fastener? Seems like the grooves on both sides of the washer pair would add significant friction.

[@NordLockGroup]

Nord-Lock washers will add additional friction between the washer and the head of the bolt. But this additional friction will not add to the torsional stress in the bolted joint.

[@DavidMihaiChira]

I really like the man who gets off the train at the end

[@AlonsoQuijanoP]

Hmmm but I am having the feeling that Nord-lock, because of the impressions it leaves, can withstand fewer (if any) re-adjustement. You can change the washers and the nut, but what about the workpiece?

[@kingof20v]

The effect on the base material wont decrease there grip. The washer will either fall into the old depressions, or just form new ones.

[@texnician]

I would be interested to see an identical video where the bolt is not lubricated.

[@NordLockGroup]

+texnician We'll keep that in mind for future videos. Where are you based? Our sales people make live demos with M8 bolts and we could arrange such a demo if we have sales people close by! Let us know here or through [e-mail] if you are interested in that!

[@JAnx01]

1. The lubrication is used to accelerate the loosening effect. 2. It's not like it is unusual for threads on bolted connections to become greasy while used on machines.

[@drtracernum20]

in my business. Summers Manufacturing Co. we are required to graphite lube ALL bolts. a nut and bolt friction welding themselves is worse than having it loose a little tension over time.

[@jimarcher5255]

Continental and Lycoming requires lubricated nuts and bolts on their cylinder connections.

[@tomallen100]

A perfect design.

[@NordLockGroup]

Thanks Tom!

[@MegaFPVFlyer]

Now this is advertising. Raw data derived from an industry standard test... I don't think you can get much better than that.

[@dolmio_sauce]

Looks like the v4 tribeca core theroey can be applied here

[@jaredcallahan9515]

It still relies on friction between the head of the bolt and the washer then the washer and the material to be secured...When this washer is locked together, what makes it any different than a standard serrated washer?

[@NordLockGroup]

Any movement in loosening direction will always take place where friction is as lowest. For Nord-Lock washers this means that movement (or intention to move) will always happen between the washers and when that is happening, the movement will be blocked by the cam wedges since sliding along the wedges will increase the distance between the two washers and slightly stretch the bolt. Using a standard serrated washer means that you only rely on friction between washer and bolt head, and washer and mating surface. The proven wedge effect is missing.

[@jaumeesquerda3373]

la mejor idea del mundo de la tornilleria

[@PaulGreggBYRC]

I'm suspicions, in that the washers dig into the joined materials, creating crack start sites for fatigue cracks.

[@NordLockGroup]

+Paul Gregg The Nord-Lock washer creates impression marks in the underlying material as well as on the bolt/nut. This however, does not initiate crack formation or increase probability of fatigue cracks.

[@PaulGreggBYRC]

+Nord-Lock Group Sharp physical features like those impression marks create potential crack initiation sites. Do you have fatigue test data on bolted joints with and without this type of fastener? Haven't locknuts already solved this problem? www.aircraftfast.com/self-locking-nuts.htm

[@NordLockGroup]

+Paul Gregg We have done a few different fatique tests. We have customers for over 30 years and none of them, as far as we know, have experienced cracks in their component materials. Paul, if you would like to discuss this deeper, please let us know your location and a Nord-Lock representative will contact you. You can contact us at [e-mail]. Thank you!

[@PaulGreggBYRC]

+Nord-Lock Group I don't believe I've ever seen fasteners which put sharp grooves in joined materials used in aerospace applications. I am supposing this type of fastener is used in applications where fatigue stresses are not critical, and weight is not as much of a design factor. There is a lot of documentation of the effects of stress concentrations such as surface indentations: www.google.com/webhp?sourceid=chrome-instant&ion=1&espv=2&ie=UTF-8#q=kt+scratches+metal+fatigue+

[@mike_winchester]

Calm down, Paul.

[@justbanter8727]

super video thank you - just the info I needed

[@sajidarodiya7289]

M. .

[@Randomguy-zv3tv]

I was marketing this stuff.. Previous week

[@zyankali2357]

I want to See the Test with loctide or hot lock

[@TheEZFix]

Why didn't you guys try Loctite?

[@nic12344]

I would like to know how it compares to RIPP Lock. Their Junker test seems to indicate similar results.

[@NordLockGroup]

Hi, we have not filmed any test comparing the Ripp-lock washer yet. Since it is only one washer with serrations it is a friction locking method. This means that during tightening or untightening it will damage the contact surface against the fastener or the mating surface.

[@kalijasin]

The plain washer gave the nut a smooth surface to move and glide across as the nut was loosening.

[@monkeyjuju7441]

I feel like this could just create a different manner of failure not typically seen with the other methods tested that don't need to dig into the surface material. I'd be interested to see an actual long term test with different materials and types(castings, sheet metal, billets, etc.) To see the actual effects this has on the material that none of the others would. I mean if it causes metal fatigue due to the vibrations reverberating through each of the impressions causing metal fatigue and ultimately catastrophic failure, in a lot of cases that'd be much worse than simply having a maintenance schedule that includes regularly tightening bolts. For me, 40 seconds doesn't really prove much in that respect, so it's hard to say if they're really a better choice. Regardless I'd definitely be willing to at least give them a try to see for myself though

[@brunolda2008]

Would it be possible to include castle nut and split pin in future testing videos?

[@NordLockGroup]

Thank you and we will take note of your suggestion.

[@frankdiscussion9988]

Why? Clearly the nut is locked on by the split pin. Maybe you should ask them to include test of a bolt that is welded too? JK..but I don't know why they would test a castle-nut....

[@ohger1]

You would need an infinitely degreed hole (impossible) and a "castle" the exact same size as the pin and bolt hole to prevent the fastener from moving at all. If the nut moves far enough to catch the pin, the torque on the bolt changes. In most situations, the castle and cotter pin would prevent the bolt from loosening much, but not completely which is what this system seems to accomplish.

[@ronb1071]

I fell on agree with you and put a bunch of posts explaining that

[@gcsindia528]

Superb

[@nvelluva]

cool video..what software was this done on?

[@NordLockGroup]

+Navaneeth Velluva This software has been developed by Nord-lock. There are many companies supplying Junker machines and they have their own software which will do the same thing. The test is a standard test - DIN65151.

[@tednugent2973]

Are nord-lock washers good for oil pans? Concerned that you need a lot of tightening, while with an oil pan, you shouldn't over tighten to prevent squashing the gasket.

[@NordLockGroup]

Hi Ted, Nord-Lock washers can be used even if the joints are immersed in oil. In order to not squash the gasket, the tightening must be accurate enough. With a good torque wrench and using lubricant on the thread and under the bolt head / nut (tightening element), an accuracy of ±10% is easy to achieve. Important to use the right torque value since different lubricant has different friction coefficient. It is also vital to tighten the joints clamping a gasket as evenly as possible and using a star pattern when tightening joints in a flange with gasket is common practice. If the joints are immersed in oil, it may be a good idea to use non-glued Nord-Lock washers. That would eliminate the risk of the glue contaminating the oil. We hope this answered your question.

[@tednugent2973]

Nord-Lock Group - Thanks