Flat Washers

Flat washers are the quiet strength behind secure, professional assemblies, and our range is built to make your work faster, cleaner, and more reliable. Engineered to spread load, protect surfaces, and deliver repeatable torque, our flat washers help every bolt, screw, and stud perform at its best. From high-volume OEM production to urgent MRO fixes, our inventory, materials, and tight tolerances keep your projects on spec and on schedule.

Why Choose Our Flat Washers

Our flat washers create a stable, uniform bearing surface that prevents pull-through, reduces galling on softer substrates, and stabilizes clamp load so joints stay tight under vibration and thermal cycling. Every washer in our line is produced for flatness, concentricity, and edge quality so you can rely on consistent seating and predictable torque values. 

The result is fewer re-torques, less damage to painted or plated surfaces, and joints that resist loosening in real-world conditions. Whether you’re mounting motors, framing equipment, or assembling enclosures, our flat washers give your fasteners the stable footing they need to hold strong.

If your application calls for wider coverage on thin sheets or oversized holes, our Fender Washers provide the extra diameter you need without adding thickness. When preload retention matters, add a Conical Spring Washer to complement your flat washer and maintain tension under dynamic loads. 

For visible hardware that needs a polished look and gentle material contact, pair your setup with a Finishing Washer to elevate both performance and appearance.

DIN 125 Flat Washers

Our DIN 125 flat washers follow the trusted European standard for general-purpose load distribution. These standard circular washers sit beneath a nut or bolt head to spread clamping force over a larger area, protecting the joint face and improving torque-to-tension consistency. 

Available in common metric sizes with precise inner and outer diameters and thickness control, our DIN 125 options are manufactured in carbon steel, stainless steel, and specialty alloys, with finishes such as zinc plating, black oxide, and passivation to match your environment and aesthetic.

Materials, Sizes, and Compatibility

Choose from low-carbon steel for everyday value, 304 or 316 stainless for moisture-prone or corrosive environments, and specialty materials when elevated temperatures or chemicals are in play. 

We stock popular metric and inch sizes to match standard screw and bolt diameters, ensuring the right ID for the shank, the right OD for the bearing surface, and the right thickness for your clamp load targets. If your drawing calls for a specific standard, we can guide you to the equivalent part in our range so your documentation and production stay perfectly aligned.

FAQs

What are flat washers used for?

Flat washers are used to distribute the load of a threaded fastener over a wider surface area, protecting the mating material, improving torque-to-tension control, and reducing the risk of pull-through or imprinting. They also help achieve a smoother, more stable bearing surface that supports consistent clamp load.

What is the difference between a flat washer and a plain washer?

In most contexts there is no difference—“plain washer” is simply another term for the standard flat washer. Some standards use “plain” to distinguish the basic, general-purpose style from specialty versions such as fender, finishing, or spring washers, but the function remains the same: flat load distribution beneath the fastener.

What is another name for a flat washer?

A flat washer is commonly called a plain washer. In certain standards and catalogs you may also see references to “Type A” or “Form A/B/C” plain washers, which denote specific dimensional series rather than a different function.

What is the ASME standard for flat washers?

The ASME standard covering general-purpose plain (flat) washers is ASME B18.22.1, which defines key dimensions and tolerances for inch-series plain washers used in mechanical fastening.