What are these metal washers called please?

[Tara100]

Hello

I've been struggling to find large thin metal washers like the one in the photo.
(I lost the originals for a Keter plastic shed that was taken down, and Keter customer service are unresponsive after 3 months)

Does anyone know what they are called please?

I've looked up serrated / locking / shakeproof / toothed washers, and can find none with this edging, and without the correct name type, I'm really stuck with a search.

(The outer measurement is 33mm and the inner is 27mm - they are 0.5mm thickness )

Thank you in advance

 

[magicmushroom666]

Looks like a custom washer.

You can buy them with the bolt part:
https://www.ebay.co.uk/itm/204074812142

 

[just pumps]

Does it really need to be the same.

 

[Tara100]

Looks like a custom washer.

You can buy them with the bolt part:
https://www.ebay.co.uk/itm/204074812142

I have all 24 bolts thanks. It's just the washers that were lost.

 

[Tara100]

Does it really need to be the same.

Good question, and I've no idea to be honest
I guess they must serve a locking purpose, but they are so thin / fine that I wonder how.

 

[matlob]

I guess you found the ones that are £3 each on ebay? I'd just try something similar to see if that works

 

[johnny2007]

Easyfix Steel Shakeproof Washers M5 x 0.6mm 100 Pack

Order online at Screwfix.com. BZP. FREE next day delivery available, free collection in 5 minutes.

www.screwfix.com

These would do exactly the same job.

 

[Munroast]

as above, I would have thought anything similar would do unless there is a specific reason for that design!

some say 'toothed lock washers' should be replaced after every use (i don't, but guess nasa woud on a space rocket)

 

[martygturner]

A plastic shed...so its just to stop the bolt undoing as it vibrates in the wind ... so any sprung washer will do...

 

[Munroast]

So it is not a deep probe space ship!

 

[freddiemercurystwin]

I doubt anyone will sell something suitable in that size.

 

[foxhole]

Internal Shakeproof Washers | Fastenright Ltd

Internal shakeproof washers available in a range of sizes and materials from Fastenright. Specials made to order. Please send us your requirements.

www.fastenright.com

 

[jumbojim]

These may be suitable. The M27 are the near the right size but they are thinner.

https://www.ebay.co.uk/itm/353735267542

 

[conny]

as above, I would have thought anything similar would do unless there is a specific reason for that design!

some say 'toothed lock washers' should be replaced after every use (i don't, but guess nasa woud on a space rocket)

As a skilled engineer I always change any form of lock washer after I've removed the nut/bolt. They do in the aircraft industry and woe betide anyone found not doing so.

 

[freddiemercurystwin]

As a skilled engineer I always change any form of lock washer after I've removed the nut/bolt. They do in the aircraft industry and woe betide anyone found not doing so.

You can't really compare the aviation industry to a plastic shed.