Flat washer: This kind of washer on the pic is unstandard washer. It is the punching parts, , we can produce from the size M2-M42, the Material of it on the pic is steel, the hardness of it is higher than general ones. The material can be stainless lteel, steel or copper. We can make according to buyer's drawings or samples or standard.
Audited Supplier 
){kind=link}