DIN 557 dimensions — Square nuts
1994 edition, current · 6 sizes, M5 – M16 see the cross-reference →
✓We supply to DIN 557. Name it on your order.
DIN 557 dimensions
| Thread size | PThread Pitch (mm) | dwBearing Diameter (min) (mm) | eWidth Across Corners (max) (mm) | eWidth Across Corners (min) (mm) | mNut Height (mm) | mNut Height (min) (mm) | JWrenching Height (min) (mm) | sWidth Across Flats (max) (mm) | sWidth Across Flats (min) (mm) | Clearance holefine / medium / coarse (mm) | Tap drillcoarse pitch (mm) |
|---|---|---|---|---|---|---|---|---|---|---|---|
| M5 | 0.8 | 6.7 | 11.3 | 9.93 | 4 | 3.52 | 2.5 | 8 | 7.64 | 5.3 / 5.5 / 5.8 | 4.2 |
| M6 | 1 | 8.7 | 14.1 | 12.53 | 5 | 4.52 | 3.2 | 10 | 9.64 | 6.4 / 6.6 / 7 | 5 |
| M8 | 1.25 | 11.5 | 18.4 | 16.34 | 6.5 | 5.92 | 4.1 | 13 | 12.57 | 8.4 / 9 / 10 | 6.8 |
| M10 | 1.5 | 14.5 | 24 | 21.54 | 8 | 7.42 | 5.2 | 17 | 16.57 | 10.5 / 11 / 12 | 8.5 |
| M12 | 1.75 | 16.5 | 26.9 | 24.02 | 10 | 9.42 | 6.6 | 19 | 18.57 | 13 / 13.5 / 14.5 | 10.2 |
| M16 | 2 | 22 | 33.9 | 30.11 | 13 | 12.3 | 8.6 | 24 | 23.16 | 17 / 17.5 / 18.5 | 14 |
6 of 6 sizes shown. Clearance holes are fine / medium / coarse to ISO 273; tap drill is for the coarse pitch.
What we supply to DIN 557
2 materials| Material | Property class | Finish |
|---|---|---|
| Carbon Steel | 6 · 8 · 10 | Zinc Plated · Plain |
| Stainless Steel | A2-70 · A4-80 | Plain · Passivated |
Property classes
ISO 898-1 · ISO 3506-1| Class | Rm min. | Yield requirement | Elongation requirement | Hardness | Typical use |
|---|---|---|---|---|---|
| A4-80 | 800 MPa | Rp0.2 min. 600 MPa | 0,3d mm | - | The strongest 316-type class; marine and chemical service where 70 does not carry the load. |
| A2-70 | 700 MPa | Rp0.2 min. 450 MPa | 0,4d mm | - | Cold-worked austenitic stainless, typically 304 — outdoor, wet and food service away from chlorides. |
These values meet the requirements of ISO 3506-1. We supply to these classes and issue the matching mill certificate and third-party test report with your order.
