We are the biggest producers for stainless steel bolts and nuts in India, as our name suggests we are manufacturing big bolts and nuts in stainless steel grades in the under mentioned table.
Get more details here – https://www.bigboltnut.com/material-grade/stainless-steel.html
https://www.superiorwasher.com/washers/8826/Copper-Washers.html
Here’s a clip that describes a useful hardware material in various applications including heating, plumbing and electronics. This material — copper washers, are the perfect choice for plumbing fixtures as the ductile and malleable material provides a bearing surface deformation that minimizes damage on the surface. Plumbing fixtures and household hardware assemblies require versatility and durability and this particular type of washer provides high-corrosion resistance.
You will find that washers made from copper material are a lot softer than other materials including brass, steel or bronze. As such copper washers allow even distribution of a fastener’s load reducing surface deformation that could be caused when fasteners are tightened. Learn more about this special type of washer with this video.