What Is a DIN 9021 Fender Washer?
DIN 9021 Fender Washers
ISO Equivalent: ISO 7093 | Large OD Flat Washers
DIN 9021 defines large outer diameter flat washers (fender washers) that distribute load over a much wider area than standard washers. Essential for soft materials, oversize holes, and applications requiring maximum bearing surface.
Quick Specifications
Type
Fender / Large OD
OD Ratio
3× Nominal
Size Range
M3 – M24
Hardness
100-300 HV
ISO Equivalent
ISO 7093
Dimension Chart
| For Bolt | ID (d₁) | OD (d₂) | Thickness | vs DIN 125 OD |
|---|---|---|---|---|
| M4 | 4.3 mm | 12 mm | 1.0 mm | +3 mm |
| M5 | 5.3 mm | 15 mm | 1.2 mm | +5 mm |
| M6 | 6.4 mm | 18 mm | 1.6 mm | +6 mm |
| M8 | 8.4 mm | 24 mm | 2.0 mm | +8 mm |
| M10 | 10.5 mm | 30 mm | 2.5 mm | +10 mm |
| M12 | 13.0 mm | 37 mm | 3.0 mm | +13 mm |
| M16 | 17.0 mm | 50 mm | 3.0 mm | +20 mm |
| M20 | 21.0 mm | 60 mm | 4.0 mm | +23 mm |
Ideal Applications
🪵
Wood & Soft Materials
🕳️
Oversize/Slotted Holes
🚗
Automotive Body Panels
🏗️
Sheet Metal Work
Material Options
⚙️
Steel – Zinc Plated
Standard carbon steel with zinc coating. Most economical for indoor and light outdoor use.
🛡️
A2 Stainless (304)
Corrosion-resistant for outdoor construction, marine, and food equipment applications.
💡 DIN 9021 vs ISO 7093
Fully interchangeable — Both standards specify large OD flat washers with identical dimensions. Perfect for distributing load on soft materials or spanning oversize holes.
Shop DIN 9021 Fender Washers
Large OD washers for maximum load distribution. Steel and stainless available.
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