Shake proof washers, a different way to hold things tight!

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We have added shake proof washers to our range of fasteners, which are in both imperial and metric sizes. We have some small bags as well as selection bags of 50.

But you’re probably thinking that classic cars didn’t use shake proof washers and you’d be right! However, I noticed recently than many of the machine shop repairers, are replacing spring washers with shake proof where it makes sense.

Shake proof toothed lock washers are used with screws and nuts for electrical connectivity and for anti back off locking action. The teeth are formed in a twisted configuration with sharp edges. One edge bites into the bolt head or nut while the other edge bites into the mating surface. This ability to “lock) the fasteners in place is particularly useful where there is vibration, such as around and engine, or where movement is likely to cause problems.


In the case of a shake proof washer, the metal disc also works to keep the screw in place, absorbing vibration and sometimes also providing a resilient spring action, depending on how the washer is designed. Because shake proof washers are made to hold a screw fast, they are also known as lock washers. The big thing to remember here is that there are ONE USE ONLY, although many think that all fasteners fall into that category, shake proof washers lose most of their durability once the washer has been tightened (compressed) and then undone.


Leyton Classics now hold stocks of these washers and are able to offer them in the following sizes:

  • ½” or M12
  • ¼” or M6
  • 3/8” or M10
  • 5/16” or M8
  • 5/8” or M16


Remember, these are diameter sizes, NOT SPANNER SIZES, check our technical section for further details.


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