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  1. #1
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    Interesting info on lock washers

    .................................................. ......................

    https://www.boltscience.com/pages/he...ingwashers.htm
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    Re: Interesting info on lock washers

    It's a valid test I guess. Depends on whether the nuts were actually torqued to any kind of real world value.

    BUT.......................... Lock washers deform so badly, that any real torque specification is a joke. They start to move out from under the nut when torqued to required torque specs.

    You'll notice that any nuts used for critical applications......cylinder heads, spring hangers, etc.....................are either on top of a solid washer, or the washer is built into the nut itself as a one piece fastener.

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    Re: Interesting info on lock washers

    Yes I have a bunch of those in 1/4-20 size, I needed 4 serrated ones and I had to buy 100 , Flange Nuts they are called. They make serrated and smooth both. There's also the ones with slightly domed washers that are fastened to the nuts but spin, I believe when you torque them down the pressure of the dome keeps tension against them, I've seen them on lug nuts. I've grown partial to Nylocks on stuff I don't want to fall apart.
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    Re: Interesting info on lock washers

    I'm kind of partial to Nylocks for certain projects also.




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    Re: Interesting info on lock washers

    Great, and interesting information.

    Nylocks and/or locktite myself.

    I never trusted split washers but will use them in kits that come with them.

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    Re: Interesting info on lock washers

    Personally, I've never had much use for split lockwashers except for "soft" joints using gaskets, etc. the spring tension seems to help hold the clamp load. In a "hard" joint even a properly torqued plain nut with hardened washers is better. Flange nuts and bolts are the stuff for truck frames, beaten down good and tight they will never loosen.
    In the 80's I worked for a company that did plenty of heavy equipment work, our shop manager was a guy with a degree and zero real time experience. He caught 3 of us installing cutting edges on a D9 dozer blade and flipped out because we weren't using split locks. I personally grabbed his azz by the lapel and dragged him to the front office to see the owner, "He goes or I go" was the discussion... I explained the problem we were having in an hour long powwow, The boss offered to let the guy try laying on his back torching out junk blade frogs but he wasn't having any of that, us guys with experience were the problem according to Mr. Degree. The real suck part was I had to do his job starting the next day.

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    Re: Interesting info on lock washers

    Quote Originally Posted by 12V71 View Post
    Personally, I've never had much use for split lockwashers except for "soft" joints using gaskets, etc. the spring tension seems to help hold the clamp load. In a "hard" joint even a properly torqued plain nut with hardened washers is better. Flange nuts and bolts are the stuff for truck frames, beaten down good and tight they will never loosen.
    In the 80's I worked for a company that did plenty of heavy equipment work, our shop manager was a guy with a degree and zero real time experience. He caught 3 of us installing cutting edges on a D9 dozer blade and flipped out because we weren't using split locks. I personally grabbed his azz by the lapel and dragged him to the front office to see the owner, "He goes or I go" was the discussion... I explained the problem we were having in an hour long powwow, The boss offered to let the guy try laying on his back torching out junk blade frogs but he wasn't having any of that, us guys with experience were the problem according to Mr. Degree. The real suck part was I had to do his job starting the next day.
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    Re: Interesting info on lock washers

    I have used these https://www.nord-lock.com/en-us/nord...SAAEgILfvD_BwE on i had tried everything to keep the bolts in this was on a tophead motor, it was vibrating loose, these have not came loose in 800 hours usually it was every few days up there tightening bolts
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    Re: Interesting info on lock washers

    Quote Originally Posted by SlowBlues View Post
    Great, and interesting information.

    Nylocks and/or locktite myself.

    I never trusted split washers but will use them in kits that come with them.
    Same. Plus its the only way to keep fasteners from loosening on special assemblies that you DONT want torqued tight.


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    Re: Interesting info on lock washers

    They are really great in low torque applications.

    the only downside is the speed.

    If you have a long bolt or very fine thread it takes a long time, and a wrench the entire time, to get them off.

    I always have at least a A pack of 1/4 in and 10 mm nylocks. I like to keep a few 1/4", 5/16", 8mm, and 10mm in the toolboxes.

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    Re: Interesting info on lock washers

    Nylock nuts are decent for many applications but the real deal is either top lock or the locknuts with the small square staked section. In my climate it doesn't take long for nature's loctite to take over rendering just about any fastener unremovable without heat or cutting

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    Re: Interesting info on lock washers

    In aerospace, at least where I worked, every threaded fastener had to have either a self locking feature (like a locknut) or utilize a mechanical lock (cotter pin, bent tab washer, etc). We were constantly asked why we could not use cheaper non-locking nuts and split or star washers rather then the more expensive self locking parts. We always said "sure, if they can pass the test", where the test was providing some self locking/resistance to rotation without any preload on the bolt. There aren't many split washers on airplanes.
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    Re: Interesting info on lock washers

    Spring or split ring washers were banned by NASA on the old Space Station Freedom program back in the early 90's. I have a tech document somewhere showing they are worse than ineffective, just like the video shows. That's about the same time I stopped using them. When I find them, or they come with some kit bag, I just toss them into my 55 gallon steel crap barrel.

    Can't find the NASA document, but here's Pirate4x4's BillaVista's paper on bolts. The lock washer discussion starts on page 12.


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  22. #14
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    Re: Interesting info on lock washers

    In a joint, if you don't lose preload, you don't need self locking, but if you lose preload, you need it to keep from losing the fastener. Loose joints are bad, unfastened ones are worse. For extremely critical joints (single point failure) FAA regs required dual locking. Google FAR 25.607 if interested
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    Re: Interesting info on lock washers

    Quote Originally Posted by jrporter View Post
    In a joint, if you don't lose preload, you don't need self locking, but if you lose preload, you need it to keep from losing the fastener. Loose joints are bad, unfastened ones are worse. For extremely critical joints (single point failure) FAA regs required dual locking. Google FAR 25.607 if interested
    Are we talking assemblies with low torque values on the fasteners, that don't adequately stretch the bolt? I've observed that fasteners that are stretched, will seldom come loose. The preload keeps everything tight. IIRC, stretching is an important consideration when establishing torque values for fasteners.

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  25. #16
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    Re: Interesting info on lock washers

    The most extravagant locking methods seem to be on nuts that control preload on bearings...................which are actually mostly no preload, but have a designated endplay.........so the nut is not in stress, it's floating if it doesn't have a locking method that keeps it in place.

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    Re: Interesting info on lock washers

    Cat has used fold over locks on almost everything.

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    Re: Interesting info on lock washers

    I've never used lockwashers on anything, IMHO they should be banned. Depending on the application either gr8 flats and locknuts on a critical application or gr8 flats, regular nuts and Loctite............Mike

  29. #19
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    Re: Interesting info on lock washers

    Most of the bolts used today are too small for the application they are chosen for so whatever you use could be wrong. But a split lock washer properly made works, if it is sized for the application. Ny-locks when hot spin right off. Lock tight is like crazy glue sometimes it works sometimes it does not. Flange nuts are ok to a point, and that point is when there is a deformation of the material the flange nut will not take up the slack, and the nut can spin off. That is where the split lock washer wins. But again most bolts are extremely undersized today so the whole contest is null and void.

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  30. #20
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    Re: Interesting info on lock washers

    A properly made lock nut will tighten the nut or bolt when vibration occurs. That might be a left-hand thread lock nut.

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  31. #21
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    Re: Interesting info on lock washers

    Ny-locks when hot spin right off
    How hot?
    Some of the ones that hold raincaps on exhaust stacks
    of diesel driven equipment get pretty hot, with a lot of
    vibration and Ive never seen one spin itself off.
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    Re: Interesting info on lock washers

    I can't remember the last time I used a split lock washer. If I use a lock washer, I use an internal tooth shakeproof washer. My preference is a nylon or all-metal locknut, or Loctite.
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  33. #23
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    Re: Interesting info on lock washers

    And if you look at the second test with the lock washer under the bolt, it did stop it from coming out that is what it is supposed to do. If it loosens the teeth are designed to grab and hold the bolt from coming out. You need to know what the application is for. Head bolts are designed to stretch and keep tension on the bolt so it does not come loose, you would not want a lock washer because of the high torque and because the engine would fail before the lock washer did its job.

    On a piece of machinery that runs all the time, you can get vibration that will loosen bolts, bolts will stretch bolts will wear, so they put a lock washer in there and they keep the bolt from coming out hopefully till the next maintenance cycle. If you really do not want a nut to come off you need to drill and cotter pin or you have to drill and wire tie it like they do on aircraft parts.

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    Last edited by William McCormick; 08-22-2021 at 08:07 PM.
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    Re: Interesting info on lock washers

    Quote Originally Posted by bigb View Post
    .................................................. ......................

    https://www.boltscience.com/pages/he...ingwashers.htm
    A couple of things to note, they put the lock washer incorrectly under the head of the bolt instead of the nut, the amount of play in the clearing hole in both cases is way too large.

    I do not think too much of their adherence to the science and the reality of engineering, as it is supposed to be performed, while they do these experiments. I have seen lock washers work after a bolt had become loose because it was stretched, the lock washer kept it from coming out. Is the cut and bend in their lock washer made the right way? We are in the dark ages now so anything is possible, a fellow in China getting fifty bucks a month may not know or care which way his machine bends the washer.

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    Re: Interesting info on lock washers



    May be worth the viewing...

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