What Is a DIN 125 Flat Washer?
DIN 125 Flat Washers
ISO Equivalent: ISO 7089 | Standard Metric Flat Washers
DIN 125 defines the standard metric flat washer used worldwide. These washers distribute load, protect surfaces from fastener damage, and provide a smooth bearing surface for nuts and bolt heads. Available in Form A (without chamfer) and Form B (with chamfer).
Quick Specifications
Dimension Chart
| For Bolt | ID (d₁) | OD (d₂) | Thickness (h) |
|---|---|---|---|
| M3 | 3.2 mm | 7 mm | 0.5 mm |
| M4 | 4.3 mm | 9 mm | 0.8 mm |
| M5 | 5.3 mm | 10 mm | 1.0 mm |
| M6 | 6.4 mm | 12 mm | 1.6 mm |
| M8 | 8.4 mm | 16 mm | 1.6 mm |
| M10 | 10.5 mm | 20 mm | 2.0 mm |
| M12 | 13.0 mm | 24 mm | 2.5 mm |
| M16 | 17.0 mm | 30 mm | 3.0 mm |
| M20 | 21.0 mm | 37 mm | 3.0 mm |
| M24 | 25.0 mm | 44 mm | 4.0 mm |
Material Options
Steel – Zinc Plated
Standard carbon steel with clear or yellow zinc. Most economical for indoor applications.
A2 Stainless (304)
Excellent corrosion resistance. Match with A2 stainless bolts and nuts.
A4 Stainless (316)
Marine-grade with molybdenum. For saltwater, chemical, and medical applications.
When to Use Flat Washers
💡 DIN 125 vs ISO 7089
Fully interchangeable — Both standards define identical flat washers. ISO 7089 = Form A (no chamfer), ISO 7090 = Form B (with chamfer).
Shop DIN 125 Flat Washers
Standard metric flat washers in steel and stainless. All common sizes in stock.
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