This is an EPDM washer. This is a washer that is used on roofs and metal roof systems.
You can see on this side it has stainless steel and on the backside, it has EPDM rubber.
So how these are used-this is a half-inch diameter.
If you were using a lag screw with this washer, you'd put this washer on like this and they fit on very tight and snug.
As you can see. They just can slide up there.
You can see it fits nice and tight against the head so there's no gap.
That rubber is tight up against the shank of the lag screw so there'll be no water leakage.
So should water come down, go under, and get behind there, it's not going to come down between the shank.
It's gonna give a complete seal.
The next washer I have is a cup finishing washer.
In a cup finishing washer, you would use a flathead screw, wood screw, sheet metal screw, an oval head sheet metal wood screw.
You would use those to give a nice finished look to the product that you're building.
You can see in the back; that would be the back of a cup washer.
This comes in several different materials.
You can get them in zinc, you can get them in 18-8 stainless, 410 stainless, also in 316 stainless.
I have what they call a fender washer. A fender washer is substantially larger than a standard washer.
Here's a standard stainless steel washer. Here's a fender washer. You can see the outside diameter.
It's larger than the other washer, then the standard washer.
You can get these diameters in several different outside diameters.
Typically, a fender washer is used in applications where you want to have some type of large surface to grab.
This is a beveled washer. This also has hot-dip galvanized on it. Many different types of applications this is used in.
This is also used in exterior applications. This is a dock washer.
Dock washers are used in docks, boat docks, things like that where they're putting bolts through.
Lag screws through. And they want to grab a big surface. And they're very, very thick.
A backup rivet washer. These are used in conjunction with rivets.
They are to back up the backside of a rivet when you want to add some more support to the rivet itself.