Fender Washer / Large OD Flat Washer (DIN 9021)
Fender washers (DIN 9021) have an outside diameter approximately 3 × the bolt diameter — much larger than a standard DIN 125 flat washer. The extra surface area distributes clamping load across a wider region, useful when bolting against wood, plastic, sheet metal, or oversized holes.
Specifications
| Standard | DIN 9021 |
|---|---|
| Size Range | M3 – M30 |
| Outside Diameter | Approximately 3 × bolt diameter |
| Material | Carbon steel, Stainless 304/316 |
Frequently Asked Questions
When do I use a fender washer vs a regular flat washer?
Fender washer: when bolting against soft material (wood, plastic, thin sheet metal), when the hole is oversized, or when load needs to be spread over a larger area. Regular flat washer: standard hardware-on-hardware bolting where modest load distribution is sufficient.
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