DIN 555 Hex Nuts
DIN 555 hexagon nuts are metric fasteners manufactured in compliance with the German industrial standard DIN 555-1987. This standard specifies strict dimensional tolerances, mechanical performance thresholds and material requirements, delivering reliable interchangeability for traditional European mechanical assemblies and metric bolt matching systems.
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Product introduction
DIN 555 hexagon nuts are metric fasteners manufactured in compliance with the German industrial standard DIN 555-1987. This standard specifies strict dimensional tolerances, mechanical performance thresholds and material requirements, delivering reliable interchangeability for traditional European mechanical assemblies and metric bolt matching systems.
Common Specifications
| Materials | Carbon steel |
| Class | 5, 6, 8, 10,12 |
| Range | M3 - M64 |
| Thread | Coarse , Fine, Extra Fine, Special-Fine |
| Surface | Plain, zinc plated, hot-dip galvanized, GEOMET, ZINC-NICKLE, DACROMATE etc. |
Key Features
- Conforms to DIN 555 standard (Product Grade C)
- Strict dimensional control ensuring high interchangeability for legacy assemblies
- Diverse material options covering carbon steel, alloy steel and stainless steel
- Multiple surface finishes available for corrosion resistance and environmental adaptability
- Optimized load-bearing capacity for traditional mechanical connections
Application industry
- Legacy European Machinery & Equipment Retrofit
- General Mechanical Manufacturing & Assembly
- Construction & Infrastructure Engineering
- Agricultural Machinery & Traditional Industrial Systems
- Automotive Aftermarket & Legacy Vehicle Maintenance
data table
| Size | M5 | M6 | M8 | M10 | M12 | M16 | M20 | M22 | M24 | M27 | M30 | M33 | M36 | M39 | M42 | M45 | M48 | M52 | M56 | M60 | M64 | M72 | M80 | M90 |
| Coase | 0.8 | 1 | 1.25 | 1.5 | 1.75 | 2 | 2.5 | 2.5 | 3 | 3 | 3.5 | 3.5 | 4 | 4 | 4.5 | 4.5 | 5 | 5 | 5.5 | 6 | 6 | 6 | 6 | 6 |
| Fine | 0.5 | 0.75 | 1 | 1.25 | 1.5 | 1.5 | 2 | 2 | 2 | 2 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 4 | 4 | 4 | 4 | 4 | 4 |
| Extra Fine | - | - | 0.75 | 1 | 1.25 | 1 | 1.5 | 1.5 | 1.5 | 1.5 | 2 | 2 | - | - | - | - | - | - | - | - | ||||
| s Min (mm) | 7.64 | 9.64 | 12.57 | 16.57 | 18.48 | 23.16 | 29.16 | 31.00 | 35.00 | 40.00 | 45.00 | 49.00 | 53.80 | 58.80 | 63.10 | 68.10 | 73.10 | 78.10 | 82.80 | 87.80 | 92.80 | 102.80 | 112.80 | 127.50 |
| s Max (mm) | 8.00 | 10.00 | 13.00 | 17.00 | 19.00 | 24.00 | 30.00 | 32.00 | 36.00 | 41.00 | 46.00 | 50.00 | 55.00 | 60.00 | 65.00 | 70.00 | 75.00 | 80.00 | 85.00 | 90.00 | 95.00 | 105.00 | 115.00 | 130.00 |
| e Min (mm) | 8.63 | 10.89 | 14.20 | 18.72 | 20.88 | 26.17 | 32.95 | 35.03 | 39.55 | 45.20 | 50.85 | 55.37 | 60.79 | 66.44 | 71.30 | 76.95 | 82.60 | 88.25 | 93.56 | 99.23 | 104.86 | 116.16 | 127.46 | 144.08 |
| m Min (mm) | 3.40 | 4.40 | 5.75 | 7.25 | 9.25 | 12.10 | 15.10 | 17.10 | 17.95 | 20.95 | 22.95 | 24.95 | 27.95 | 29.75 | 32.75 | 34.75 | 36.75 | 40.75 | 43.75 | 46.75 | 49.50 | 56.50 | 62.50 | 70.50 |
| m Max (mm) | 4.60 | 5.60 | 7.25 | 8.75 | 10.75 | 13.90 | 16.90 | 18.90 | 20.05 | 23.05 | 25.05 | 27.05 | 30.05 | 32.25 | 35.25 | 37.25 | 39.25 | 43.25 | 46.25 | 49.25 | 52.50 | 59.50 | 65.50 | 73.50 |
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