Stainless Steel Large OD Flat Washer

Stainless Steel Large OD Flat Washer is a type of flat circular metal gasket with a central hole. Its outer diameter is a lot bigger than a regular flat washer – usually about 2.5 to 3 times the size of the inner hole. So compared to a normal flat washer, this large outer diameter one gives you a wider contact area. That helps spread the fastener's pressure more evenly over the workpiece, covers large or oddly shaped holes, and gives soft or delicate materials a bit of extra protection. Because of the way they look, people often call them 'penny washers' or 'fender washers'.

FAQ

（1）What is the temperature range for Stainless Steel Large OD Flat Washer?

The working temperature range for 304 and 316 stainless steel is typically from -60°F to +302°F (approximately -51°C to +150°C). When used near the exhaust system, they can withstand 250°C for a short period, but it is recommended to keep the temperature below 150°C for long-term use.

（2）Do you offer any surface treatment or finishing?

Stainless steel parts are usually left as-is, without any polishing. They keep that natural metal look and don't rust easily. If you want a smoother surface, you can get them electro‑polished. And if you need them to be black, you can do a blackening treatment.

（3）Do you have RoHS or REACH compliance?

Yeah, our stainless steel doesn't contain lead, mercury, or hexavalent chromium. We can also provide RoHS and REACH declarations if you need them.

Installation and Usage Suggestions

(1) Match the fastener sizes correctly

Make sure the hole in the Stainless Steel Large OD Flat Washer is just a little bigger than the bolt threads. It should slip onto the bolt easily – not too loose, not too tight.

(2) Clean the assembly surface

Before you start, wipe off any metal bits or paint chips from the surface you're working on. That way the Stainless Steel Large OD Flat Washer can sit flat and make good contact.

(3) Use a torque wrench

Tighten to the torque spec recommended for your bolt. The wide, flat washer can change how the tightening feels, so using a torque wrench helps you get it right.

（4）It can be used on both sides simultaneously with large outer diameter washers.

For extremely soft materials, large outer diameter washers can be placed on both sides of the bolt head and the nut to evenly distribute the compressive force.

（5）Can be reused after disassembly

Compared to the thin anti-loosening washers, the Stainless Steel Large OD Flat Washer can be used multiple times as long as there is no obvious deformation, cracks or crushing.