
DIN557 Square Nuts
DIN 557 specifies class C square nuts with metric coarse threads, designed for applications where larger bearing surface and anti-rotation properties are required. The square shape provides improved grip with wrenches and prevents rolling during assembly.
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Product introduction
DIN 557 specifies class C square nuts with metric coarse threads, designed for applications where larger bearing surface and anti-rotation properties are required. The square shape provides improved grip with wrenches and prevents rolling during assembly.
Common Specifications
|
Materials |
Carbon steel |
|
Class |
4.5, 5 |
|
Range |
M3 - M24 |
|
Thread |
Coarse , Fine, Extra Fine, Special-Fine |
|
Surface |
Plain, zinc plated, hot-dip galvanized, GEOMET, ZINC-NICKLE, DACROMATE etc. |

Key Features
- Square shape prevents rolling and rotation
- Larger bearing surface than hex nuts
- Class C tolerances for general applications
- Compatible with square head bolts
- Conforms to DIN 557 specifications

Application industry
- T-slot and aluminum profile connections
- Injection molded part insert nuts
- Furniture and fixture assembly
- Agricultural machinery
data table

| Size | M5 | M6 | M8 | M10 | M10 | M12 | M12 | M16 |
| Coase | 0.8 | 1 | 1.25 | 1.5 | 1.5 | 1.75 | 1.75 | 2 |
| Fine | 0.5 | 0.75 | 1 | 1.25 | 1.25 | 1.5 | 1.5 | 1.5 |
| Extra Fine | - | - | 0.75 | 1..00 | 1 | 1.25 | 1.25 | 1 |
| s Min (mm) | 7.64 | 9.64 | 12.57 | 15.57 | 16.57 | 17.57 | 18.48 | 23.16 |
| s Max (mm) | 8.00 | 10.00 | 13.00 | 16.00 | 17.00 | 18.00 | 19.00 | 24.00 |
| e Min (mm) | 9.93 | 12.53 | 16.34 | 20.24 | 21.54 | 22.64 | 24.02 | 30.11 |
| m Min (mm) | 3.52 | 4.52 | 5.92 | 7.42 | 7.42 | 9.42 | 9.42 | 12.30 |
| m Max (mm) | 4.00 | 5.00 | 6.50 | 8.00 | 8.00 | 10.00 | 10.00 | 13.00 |
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