Caleb Components is a stockist of both Medium Duty and Light Duty Serrated Safety Washers. These washers are based on the Disc Spring concept, however these have serrations on both faces that grips into the bolt/screw head as well as the mating surface, ensuring a tight grip.
These are particularly useful in situations where there is a high amount of vibration such as electric drills, washing machines etc.
Please check out our two links below to see if we can supply what you need… If not, please get in touch with us and we will be more than happy to help you find what you’re looking for.

https://springfasteners.co.uk/product-category/disc-springs/light-duty-serrated-safety-washer-lds/

https://springfasteners.co.uk/product-category/disc-springs/medium-duty-serrated-safety-washer-mds/