Standard Fender Washers
What are standard fender washers? Standard fender washers are flat washers with an oversized outer diameter relative to the hole, spreading load across thin or soft material like sheet metal, wood, and plastic. Offered in a wide range of materials from 18-8 and 316 stainless to zinc and hot dipped galvanized, they stop bolts and nuts from pulling through.
What are fender washers used for?
A fender washer's large outer diameter spreads a fastener's clamping force over a much wider area than a standard flat washer, which stops the head or nut from pulling through thin sheet metal, soft wood, plastic, and oversized or slotted holes. The name comes from automotive body and fender work, but they are used anywhere the material is too thin or soft to hold on its own. Match the inner diameter to your bolt, and choose the material for the environment, with 316 or A4 for coastal exposure, zinc for economical indoor use, and hot dipped galvanized for outdoor durability.
Material choices for standard fender washers
- Stainless (18-8, 304, 316): corrosion resistance, with 316 for coastal use.
- Metric stainless (A2, A4): A2 comparable to 304, A4 to 316.
- Zinc plated: economical corrosion resistance for indoor and dry use.
- Hot dipped galvanized: heavy zinc coating for outdoor and wet use.
Common applications for standard fender washers
- Thin sheet metal and body panels
- Plumbing, automotive, and trailer work
- Oversized and slotted holes
- Marine and coastal hardware (316, A4)
For heavier or thicker versions, see extra thick fender washers, and browse every option on the main fender washers category.
Standard Fender Washers FAQ
What is the difference between a fender and a flat washer?
A fender washer has a much larger outer diameter relative to the hole, giving a wider bearing surface to resist pull-through in thin or soft material.
What materials do fender washers come in?
18-8, 304, and 316 stainless, metric A2 and A4, zinc plated, and hot dipped galvanized, so you can match the washer to the environment.
Which material for coastal use?
Use 316 or metric A4 stainless for coastal and saltwater exposure. Hot dipped galvanized suits general outdoor use, and zinc suits dry indoor work.