Fender Washers

Fender washers are the quiet problem-solvers of fasteners, giving your assemblies extra support exactly where you need it most. Our fender washers feature a larger outside diameter than standard washers, helping you spread load over a wider surface and protect sensitive materials from damage. Whether you are working with thin sheet metal, plastics, or soft substrates, our fender washers keep your connections secure, stable, and professional-looking.

What Are Fender Washers?

Our fender washers are wide, flat washers with a comparatively small inner hole and a much larger outer diameter, designed to distribute clamping force over a bigger area than regular flat washers. This makes them ideal for reinforcing oversized or slotted holes, supporting thin panels, and preventing fastener heads from pulling through softer materials. 

You will see our fender washers used everywhere from automotive bodywork and HVAC installations to carpentry, marine projects, and general fabrication where added support and stability are essential. 

If you are building or repairing a system and want the right washer for each task, you can also pair your selection with our Flat Washers for everyday fastening, Finishing Washers for a clean, decorative look, and Conical Spring Washers when you need added tension and vibration resistance.

DIN 9021 Fender Washers

Our DIN 9021 fender washers are engineered to match this popular standard, giving you a large outer diameter and generous bearing surface that spreads load effectively. When you tighten a bolt or screw against a DIN 9021 fender washer, the pressure is distributed across a wider footprint, reducing the chance of surface indentation, pull-through, or damage to softer or thinner materials. 

This makes them a top choice for thin-gauge sheet metal, body panels, cabinetry, and assemblies where hole enlargement or deformation is a concern. With precisely machined dimensions and consistent thickness, our DIN 9021 fender washers offer repeatable performance, clean fit-up, and a professional finish on every installation.

Fender Washers for Thin and Soft Materials

When you are fastening into thin sheet metal, composite panels, plastics, or wood, standard washers sometimes simply are not enough. Our fender washers create a wider platform under the fastener head, allowing you to clamp the joint securely without crushing or tearing the material. 

They also help restore strength and stability around oversized holes, repairs, or slots, so you can salvage and reinforce components instead of replacing them. From automotive fenders and trailer skins to signs, enclosures, and light structural work, our fender washers deliver the extra support your hardware needs to hold tight over time.

Materials, Finishes, and Corrosion Resistance

We offer our fender washers in a range of materials and finishes to suit your application and environment. Choose from options such as zinc-plated steel for everyday indoor use, stainless steel for corrosion resistance in outdoor, marine, or high-moisture conditions, and other material choices depending on your project needs. 

The right material helps your assemblies resist rust, staining, and premature wear, so your fasteners stay functional and visually clean longer. With consistent quality across the range, you can mix and match sizes and finishes while knowing every washer is built to perform.

Choosing the Right Fender Washer Size

Selecting the right fender washer begins with your fastener size and the material you are fastening. Our sizing options are matched to common screw and bolt diameters, so you can pick a washer with an inner hole that fits your hardware snugly while still sliding on easily. 

From there, you can choose an outer diameter large enough to support the hole and the surrounding material without looking oversized or interfering with nearby components. Whether you are working on a small repair or a large production run, our range of sizes ensures you can find a fender washer that fits neatly and performs reliably.

FAQs

What are fender washers used for?

Fender washers are used to spread the load of a fastener over a wider area, especially when working with thin or soft materials that might otherwise deform, crack, or allow the fastener head to pull through. They are commonly used in automotive fenders, body panels, sheet metal work, cabinetry, and general construction where larger bearing surfaces help protect the material and improve joint strength.

Why do they call them fender washers?

They are called fender washers because they were originally widely used in automotive applications, particularly around fenders and bodywork. When attaching thin metal panels on vehicles, standard washers did not provide enough bearing area, so a larger-diameter washer was needed to prevent the fastener from pulling through the body panel. Over time, this style of washer became known as the “fender washer,” and the name stuck, even as the product found use in many other industries and applications.

What is the difference between a fender washer and a regular washer?

The main difference between a fender washer and a regular washer is the outer diameter. While a regular flat washer has a modest outer diameter that offers basic support under a fastener head, a fender washer has a much larger outer diameter relative to the screw or bolt size. This larger surface area provides greater load distribution and better protection for thin or soft materials, making our fender washers the superior choice when you want extra support, reinforcement, or coverage around the fastener.

What size is a fender washer?

Fender washers come in a variety of sizes, typically defined by the inner diameter that matches a specific screw or bolt, along with a larger outer diameter that provides the wider bearing surface. The inner hole size is chosen to fit the fastener shank, while the outer diameter can vary to provide just the right amount of support for your material and hole size.