Pre Load in a Fastener explained in the simplest way possible - Pre-Load = Clamping Force

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  • Опубліковано 2 лют 2025

КОМЕНТАРІ • 59

  • @המכונהשבאופנוע
    @המכונהשבאופנוע 3 дні тому

    Excellent explanation! With the punch of an advertisement

  • @ovalwingnut
    @ovalwingnut 6 місяців тому +13

    Thanks for eXplaining the "wedge-washers" in detail. I was afraid the video would just "cut off" before I knew anything about them

    • @wedgelockingwashersDIN25201
      @wedgelockingwashersDIN25201  5 місяців тому +1

      Hi, it should have a link to this video really that explains it in more detail ua-cam.com/video/ug4SagX-XnM/v-deo.html

    • @ovalwingnut
      @ovalwingnut 5 місяців тому

      @@wedgelockingwashersDIN25201 Mr. Wedge™, you R a gentleman and a scholar! Thank you. Cheers from So.Ca.USA 3rd House On the Left (pls call before stopping by:)

  • @tsclly2377
    @tsclly2377 8 місяців тому +34

    I agree.. good washers can extend the life of a joint and maintain adequate fastening loads, as with variations in temperature steel bolts can slowly unload due to permanent stretch. They also help prevent a bolt from unscrewing if it becomes load deformed. Note; this is why old bolts are not to be re-used in the application that they are taken out of, such as car engine head bolts and studs. In the USA you can access these at McMaster, MSC Industrial Supply and other industrial outlets.

    • @ct1762
      @ct1762 5 місяців тому +1

      many head bolt designs can be re-used IF the service manual either says nothing about it, or (admittedly) even better if they say you can. I always thought bolts/screws that had a set torque value CAN be re-used, but ones that have a torque AND an angle spec cannot.

  • @c0mputer
    @c0mputer 8 місяців тому +19

    We were looking at a bolt for a bridge the WHOLE TIME!

    • @wedgelockingwashersDIN25201
      @wedgelockingwashersDIN25201  5 місяців тому

      Sorry I do not think I understand this, can you explain so we can maybe improve our videos.

    • @SteveDave227
      @SteveDave227 5 місяців тому +5

      @@wedgelockingwashersDIN25201 I'm not the original commenter, but I believe they were making a humorous observation regarding the revelation late in the video which showed us the bolt was holding a railing on a bridge. The commentary was not meant as a critique of your video, they meant it as a joking observation that was melodramatically emotional, to communicate their surprise at the larger picture once it was shown.

  • @timmycarey1958
    @timmycarey1958 7 місяців тому +8

    In the absence of a wedge washer, use loctite. If you're a farmer, just damage the thread below the nut with a punch.

    • @wedgelockingwashersDIN25201
      @wedgelockingwashersDIN25201  5 місяців тому +1

      Agreed that loctite can work for some applications and damaging the thread can stop the nut coming off but the point of the wedge washer is to maintain the load in the joint and not allow backing off. If safety is not a major concern then many other options that are cheaper can be used.

  • @nicholas8479
    @nicholas8479 8 днів тому

    I believe I read that side loads loosen fasteners more often than axial loads.
    I believe with side loads the frictional force between the underside of the nut/bolt head and plates is analogous to the preload. Not sure though. That is, once the side load goes above the frictional force, stuff starts to move.

  • @AlphatecEngineering
    @AlphatecEngineering Рік тому +2

    wonderful video folks!

  • @randyscott990
    @randyscott990 8 місяців тому +11

    As others mentioned, they show the addition of wedge washers but no explanation to further brilliant design. I have used them in many applications during my maintenance career and they are definitely the best solution to lock washer use.

    • @wedgelockingwashersDIN25201
      @wedgelockingwashersDIN25201  5 місяців тому

      Sorry this video does that and thanks for confirming they work, ua-cam.com/video/ug4SagX-XnM/v-deo.html

  • @ronblack7870
    @ronblack7870 8 місяців тому +32

    one thing he didn't say . once you preload a bolt any force bellow the preload does NOT add to the tension in the bolt.

    • @MEDDY-c1d
      @MEDDY-c1d 7 місяців тому +1

      What do you mean,
      Can you please explain your sentence more easily?

    • @ElectronPower
      @ElectronPower 7 місяців тому +21

      ​@@MEDDY-c1d
      Imagine you have a piece of pipe and a rubber band that goes through it. On each end of the rubber band you have a washer or a ball or anything that won't fit inside the pipe. The rubber band is shorter than the pipe, so the balls or washers at the end of the pipe are constantly forced together, against the edges of the pipe. Now, imagine pulling any of the two balls or washers away from the edge of the pipe. As you start pulling, the force will increase, before the ball or washer finally starts moving away from the edge of the pipe, as you exceed the preload tension, but until that happens, the force in the rubber band itself (which represents the screw) stays the same. So, you can pull or hang a load from that ball or washer and as long as the force of the load doesn't exceed the preload force (the one that's already present in the rubber band or a screw), the force inside the rubber band or a screw will remain the same and the parts will stay pressed together. If you have 1 ton of preload, you can pull with up to 1 ton of force, before the fastener will stretch further, the force inside the fastener will increase beyond that 1 ton, and a gap will start forming between the clamped parts, but if you pull with half a ton, the force inside the screw will remain at 1 ton - the only thing that will change is the clamping force, which will decrease by the amount that you're loading the fastener with. So, if you pull with 1 ton, you'll have 0 clamping pressure left.

    • @jaashiik
      @jaashiik 6 місяців тому +3

      this is not true. the Bolt and the clamped members have their own corresponding stiffnesses and the stiffness constant of each will determine the proportion of load taken by the bolt vs by the members.

    • @gouthamkumar1750
      @gouthamkumar1750 6 місяців тому

      It does effect the tension, what you're saying is you put some force somewhere and it doesn't effect the system that's perpectual system

    • @manumohan253
      @manumohan253 4 місяці тому

      That's not correct. Force is a vector. Whatever small force you add, it gets added to the already existing force.

  • @saurabhchhipa1062
    @saurabhchhipa1062 Місяць тому

    The viedo that you made is very aesthetic, will you please tell me how did you make this?

  • @LouisPeters-xr6hr
    @LouisPeters-xr6hr 3 місяці тому

    Is there any application where the wedge washer should be torqued until flat ? I've seen bolts/washers installed in this manner to hold down high current bus bars I assume to prevent loosening due to heat cycling. Many washers were found to be literally fractured during maintenance.

  • @Nakkokakum.europeenjiggalo
    @Nakkokakum.europeenjiggalo 3 місяці тому

    Yeah thanks bro

  • @sferg9582
    @sferg9582 8 місяців тому +28

    ".....then Wedge-Washer is the perfect solution"..... he says. Okay, HOW I ask. They just end the video with that statement and nothing to back up that statement.

    • @ARGermanS
      @ARGermanS 8 місяців тому +1

      Go to their previous video.

    • @wedgelockingwashersDIN25201
      @wedgelockingwashersDIN25201  5 місяців тому

      Hi, sorry this seems to be a common query. We should have a link to this video showing how it works compared to other methods. Any other queries please ask. ua-cam.com/video/ug4SagX-XnM/v-deo.html

    • @vadimuha
      @vadimuha 5 місяців тому

      That's an ad

  • @dmitryd3036
    @dmitryd3036 6 місяців тому +1

    untrue, if the bolt is preloaded pull force can be significantly larger than bolt preload. The bolt usually takes 10-20% of the pull force if preloaded. This is to do with clamped material stiffness which is times larger than the bolt stiffness.

  • @markifi
    @markifi 8 місяців тому +5

    pretty cool ad

  • @AngadDhillon0001
    @AngadDhillon0001 8 місяців тому +1

    Preload is same as proof load?

    • @tsclly2377
      @tsclly2377 8 місяців тому

      No. a proof load is a load that is as much as twice the rated pre-load specification before deformation and load degradation is observable under the specified loading requirement

  • @mangbecak1
    @mangbecak1 7 місяців тому +2

    Are people's comprehension skill that bad now? It minimises the effect of vibration and subsequently reduces the likelihood of them loosening.
    We're so fd

  • @chuckfischer7202
    @chuckfischer7202 8 місяців тому

    Never seen a washer like that. Where is this from?

    • @WeldinMike27
      @WeldinMike27 8 місяців тому

      Called a nordlock washer.

    • @wedgelockingwashersDIN25201
      @wedgelockingwashersDIN25201  5 місяців тому

      Hi its called a Wedge Locking Washer and our brand is Wedge Washer. There is a brand called Nord Lock also. Can we get you some samples?

  • @kurtler1
    @kurtler1 11 місяців тому

    1:05 надпись - прелоад, что это?

  • @kylewilliams6090
    @kylewilliams6090 Рік тому

    Just watched a video of (i presume an engineer) explain this concept quite ambiguous

  • @brianmonger8185
    @brianmonger8185 8 місяців тому +1

    Metric bolts are classed. Not graded.

  • @Koh-Wei-Jian
    @Koh-Wei-Jian 6 місяців тому +1

    This tells us more about screws borrowed from aunt.

  • @vitamin3076
    @vitamin3076 Рік тому

    excellente

  • @negativeindustrial
    @negativeindustrial 7 місяців тому

    Alright, send me some wedge washers. I would like to include in my next round of testing.

    • @wedgelockingwashersDIN25201
      @wedgelockingwashersDIN25201  5 місяців тому

      Hi sorry for the late reply, where would you like them sending? Please shoot us an email to info@wedgewasher.co.uk

  • @BitSmythe
    @BitSmythe 8 місяців тому +3

    *EVERY* video with synthesized voice gets an _automatic thumbs down!_ 👎🏻

  • @dilipka6528
    @dilipka6528 Рік тому

    Wow..

  • @bestamerica
    @bestamerica 8 місяців тому +1

    '
    better use lock nylon metalnuts

  • @planethedgehog2427
    @planethedgehog2427 8 місяців тому +1

    "Simple explaination"
    Explanation.

  • @Pestsoutwest
    @Pestsoutwest 8 місяців тому

    Wedge Washer more like "Lock Washer"!

    • @Wayne-n4z
      @Wayne-n4z 8 місяців тому

      No.

    • @wedgelockingwashersDIN25201
      @wedgelockingwashersDIN25201  5 місяців тому

      These are actual Wedge Washers due to the way they work, see ua-cam.com/video/ug4SagX-XnM/v-deo.html

  • @danko6582
    @danko6582 8 місяців тому

    It's more like an elastic cord than a spring.

  • @kraken1473
    @kraken1473 Місяць тому

    For the railing? Lol

  • @WeebRemover4500
    @WeebRemover4500 6 місяців тому

    fake
    a