Selecting the right 3-inch stainless steel washers can improve joint stability and corrosion resistance across outdoor, marine, and industrial applications. This guide highlights five top options, comparing material, thickness, and compatibility to help you choose reliable, long-lasting fasteners for demanding projects.
| Product | Brand | Outside Diameter | Inside Diameter | Material | Notes |
|---|---|---|---|---|---|
| Fender Washers 3/8″ x 3″ OD Stainless Steel | G GOODSZONE | 3.0 in | 0.41 in | Stainless Steel 18-8 (304) | Pack of 4; plain finish |
| Fender Washers 1/4″ x 3″ OD Stainless Steel | G GOODSZONE | 3.0 in | 0.28 in | Stainless Steel 18-8 (304) | Pack of 4; plain finish |
| Zernmiarder 1-1/2″ Flat Washers (3″ OD) | Zernmiarder | 3.0 in | 1.5 in | 304 Stainless Steel | Pack of 5; anti-corrosion coating |
| 5/8″ ID x 3″ OD Stainless Fender Washer (316) | Fastener Cart | 3.0 in | 0.625 in | 316 Stainless Steel | Extra thick; lot controlled |
| 3/8″ x 3″ OD Zinc Plated Fender Washer | G GOODSZONE | 3.0 in | 0.375 in | Low Carbon Steel | Zinc plated finish; pack of 5 |
Below are five selected 3-inch washers that consistently appear in hardware projects requiring durable, corrosion-resistant fasteners. Each entry includes a brief overview, typical applications, and installation considerations to help you compare options quickly.
Fender Washers 3/8″ x 3″ OD Stainless Steel
These oversized fender washers fit 3/8-inch bolts and offer a 3-inch outer diameter with a 0.41-inch inside diameter. Made from stainless steel 18-8 (304) with a plain finish, they are suited for moisture-prone environments and heavy-load assemblies. The set includes four washers, providing a ready-to-use option for larger fastener projects where edge support and load distribution are critical.
Fender Washers 1/4″ x 3″ OD Stainless Steel
With a 3-inch outer diameter and 0.28-inch inner bore, these 1/4-inch bolt-sized fender washers provide robust edge support for lightweight to medium-duty connections. The 304 stainless steel construction and plain finish contribute to corrosion resistance in indoor and outdoor settings. Sold in packs of four, they’re a practical option for installations requiring larger washer surface area without excessive weight.
Zernmiarder 1-1/2″ Flat Washers (3″ OD)
These 3-inch outer diameter washers are made from 304 stainless steel (18-8) and feature a 1-1/2-inch inner diameter. They are designed for screws and bolts up to 1-1/2 inches long, and the anti-corrosion finish extends longevity in a range of environments, from damp areas to industrial sites. The package includes five washers for efficient project completion.
5/8 ID x 3 OD Stainless Fender Washer (316)
This 3-inch outer diameter washer has a 5/8-inch inner diameter and is crafted from 316 stainless steel for superior corrosion resistance in marine or chemical environments. At 3/8-inch bolt compatibility, it provides a wide bearing surface and good load distribution for heavy-duty assemblies. It is sold as a smaller lot, suitable for larger industrial tasks or repair projects that require dependable performance.
Fender Washers 1/2″ x 3″ OD Large Size Zinc Plated
These large 3-inch OD fender washers are made from low carbon zinc-plated steel, offering a balance of strength and affordability. The 0.065-inch thickness with a 1/2-inch inner diameter makes them suitable for medium-to-large fasteners and projects where a larger bearing surface is required to prevent pull-through.
Buying Guide
Buying considerations for 3-inch stainless steel washers include material quality, thickness, inner diameter, and environmental exposure. Stainless steels (304/18-8 and 316) provide different levels of corrosion resistance; 316 is better for marine or chemical exposure, while 304 suits general outdoor use. Thickness affects load distribution and the area over which the bolt or screw bears weight. A larger outer diameter reduces the risk of pull-through in softer substrates but adds size and weight to the assembly.
- Material: Choose 304 for general corrosion resistance; 316 for harsh or saltwater environments.
- Inside diameter: Match to bolt or screw size to ensure a secure fit without excessive play.
- Outer diameter and thickness: Consider the bearing surface needed and the substrate strength to prevent embedment or damage.
- Finish: Plain, zinc-plated, or anti-corrosion coatings affect longevity in outdoor or humid settings.
- Packaging: Packs vary from 4 to 35 pieces; plan based on project scale and potential reuse.
- Installation: Ensure compatible tools and access for tight spaces when aligning washers with bolts.
Also consider alternative diameters and lengths if your project uses different bolt sizes. For high-load or specialized applications, combining washers with lock washers or washers made from different materials may improve reliability. Always ensure the inspected fastener assembly adheres to relevant safety and building codes for the intended use.