DIN 125 is the German dimensional standard for plain washers, commonly referred to as DIN 125 washers. It is one of the most widely specified flat washer standards worldwide, used beneath bolt heads and nuts to distribute load, protect the clamped surface, and prevent loosening. This page is part of our full fastener standards index see the hub for DIN, ISO, ASME, IS, and BS dimensional standards across bolts, nuts, and washers. Jade Alloys manufactures and supplies washers to DIN 125 and equivalent standards in carbon steel, alloy steel, and stainless steel.
DIN 125 Types
- DIN 125 Type A – plain washer with a chamfered outer edge, standard tolerance on the inner diameter, for general assembly use
- DIN 125 Type B – plain washer without a chamfer, wider inner-diameter tolerance
DIN 125 Washer Dimensions (Type A)
Nominal dimensions in millimeters for common sizes:
| Nominal Size | Inner Dia. (d1) | Outer Dia. (d2) | Thickness (h) |
|---|---|---|---|
| M4 | 4.3 | 9.0 | 0.8 |
| M5 | 5.3 | 10.0 | 1.0 |
| M6 | 6.4 | 12.0 | 1.6 |
| M8 | 8.4 | 16.0 | 1.6 |
| M10 | 10.5 | 20.0 | 2.0 |
| M12 | 13.0 | 24.0 | 2.5 |
| M16 | 17.0 | 30.0 | 3.0 |
| M20 | 21.0 | 37.0 | 3.0 |
| M24 | 25.0 | 44.0 | 4.0 |
| M30 | 31.0 | 56.0 | 4.0 |
DIN 125 Washer Weight Chart
Approximate weight in kilograms per 1,000 pieces, calculated from the nominal DIN 125 Type A dimensions above using standard carbon steel density (7.85 g/cm3):
| Size | Weight |
|---|---|
| M1.6 | 0.024 |
| M1.7 | 0.031 |
| M2 | 0.037 |
| M2.3 | 0.092 |
| M2.5 | 0.088 |
| M2.6 | 0.127 |
| M3 | 0.119 |
| M3.5 | 0.155 |
| M4 | 0.308 |
| M5 | 0.443 |
| M6 | 1.02 |
| M7 | 1.39 |
| M8 | 1.83 |
| M10 | 3.57 |
| M12 | 6.27 |
| M14 | 8.62 |
| M16 | 11.3 |
| M18 | 14.7 |
| M20 | 17.2 |
| M22 | 18.3 |
| M24 | 32.3 |
| M26 | 43.7 |
| M27 | 42.3 |
| M28 | 40.9 |
| M30 | 53.6 |
| M32 | 77.4 |
| M33 | 75.3 |
| M35 | 94.3 |
| M36 | 92.1 |
| M38 | 136 |
| M39 | 133 |
| M40 | 130 |
| M42 | 183 |
| M45 | 220 |
| M48 | 294 |
| M50 | 284 |
| M52 | 330 |
| M55 | 431 |
| M56 | 425 |
| M58 | 472 |
| M60 | 458 |
| M64 | 492 |
| M68 | 586 |
| M72 | 626 |
| M76 | 749 |
Weights are calculated (not measured) and are approximate, for reference only; actual weight varies slightly by material grade, manufacturing tolerance, and coating. Stainless steel washers (density ~7.9-8.0 g/cm3) weigh marginally more than the carbon steel values shown. For a full calculation across any size and material, use our Metal Weight Calculator.
DIN 125 Equivalent Standards
| Standard | Relationship |
|---|---|
| ISO 7089 | ISO-harmonized metric equivalent of DIN 125 Type A |
| ISO 7090 | ISO-harmonized equivalent of DIN 125 Type A with chamfer |
| ASME B18.22.1 | Inch-series plain washer equivalent |
| IS 2016 | Indian Standard equivalent for plain washers |
Material & Applications of DIN 125 Washers
DIN 125 washers are supplied in carbon steel (plain, zinc-plated, or hot-dip galvanized), alloy steel, and stainless steel (A2/A4, equivalent to 304/316), and are used across general engineering, structural, automotive, and piping assembly wherever a flat load-bearing surface beneath a bolt head or nut is required.
Frequently Asked Questions
1. What is the difference between DIN 125 Type A and Type B?
2. What is the ISO equivalent of DIN 125?
3. Which bolt and nut pair with DIN 125 washers?
Need DIN 125 washers in a specific material or size range? Contact our technical team or view the full Fastener Standards hub.
