DIN 603 dimensions — Mushroom head square neck bolts
2017 edition, current · 7 sizes, M5 – M20 see the cross-reference →
✓We supply to DIN 603. Name it on your order.
DIN 603 dimensions
| Thread size | PThread Pitch (mm) | dₛBody Diameter (max) (mm) | dₛBody Diameter (min) (mm) | vSquare Neck Width (max) (mm) | vSquare Neck Width (min) (mm) | fSquare Neck Height (max) (mm) | fSquare Neck Height (min) (mm) | dkHead Diameter (max) (mm) | dkHead Diameter (min) (mm) | kHead Height (max) (mm) | kHead Height (min) (mm) | Clearance holefine / medium / coarse (mm) | Tap drillcoarse pitch (mm) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| M5 | 0.8 | 5 | 4.52 | 5.48 | 4.52 | 4.1 | 2.9 | 13.55 | 12.45 | 3.3 | 2.7 | 5.3 / 5.5 / 5.8 | 4.2 |
| M6 | 1 | 6 | 5.52 | 6.48 | 5.52 | 4.6 | 3.4 | 16.55 | 15.45 | 3.88 | 3.12 | 6.4 / 6.6 / 7 | 5 |
| M8 | 1.25 | 8 | 7.42 | 8.58 | 7.42 | 5.6 | 4.4 | 20.65 | 19.35 | 4.88 | 4.12 | 8.4 / 9 / 10 | 6.8 |
| M10 | 1.5 | 10 | 9.42 | 10.58 | 9.42 | 6.6 | 5.4 | 24.65 | 23.35 | 5.38 | 4.62 | 10.5 / 11 / 12 | 8.5 |
| M12 | 1.75 | 12 | 11.3 | 12.7 | 11.3 | 8.75 | 7.25 | 30.65 | 29.35 | 6.95 | 6.05 | 13 / 13.5 / 14.5 | 10.2 |
| M16 | 2 | 16 | 15.3 | 16.7 | 15.3 | 12.9 | 11.1 | 38.8 | 37.2 | 8.95 | 8.05 | 17 / 17.5 / 18.5 | 14 |
| M20 | 2.5 | 20 | 19.16 | 20.84 | 19.16 | 15.9 | 14.1 | 46.8 | 45.2 | 11.05 | 9.95 | 21 / 22 / 24 | 17.5 |
7 of 7 sizes shown. Clearance holes are fine / medium / coarse to ISO 273; tap drill is for the coarse pitch.
What we supply to DIN 603
3 materials| Material | Property class | Finish |
|---|---|---|
| Carbon Steel | 4.8 · 8.8 | Zinc Plated · Blackened · Phosphate · Plain · Dacromet · Hot Dip Galvanized |
| Alloy Steel | 10.9 | Zinc Plated · Blackened · Phosphate · Plain · Dacromet |
| 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 |
|---|---|---|---|---|---|
| 4.8 | 420 MPa | Rpf min. 340 MPa (not a test value) | Af min. 0.24 | 130 - 220 HV | Light-duty non-structural work; the low-cost class for large sizes carrying little load. |
| 8.8 (d <= M16) | 800 MPa | Rp0.2 min. 640 MPa | A min. 12 % | 250 - 320 HV | The general-purpose structural class — steel-to-steel joints, machinery, vehicle assembly. Assume this if no class is stated. |
| 8.8 (d > M16) | 830 MPa | Rp0.2 min. 660 MPa | A min. 12 % | 255 - 335 HV | |
| 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. |
| 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. |
| 10.9 | 1040 MPa | Rp0.2 min. 940 MPa | A min. 9 % | 320 - 380 HV | Preloaded high-tension joints — engine, gearbox and structural connections that grip by friction. Needs controlled tightening. |
These values meet the requirements of ISO 898-1 / ISO 3506-1. We supply to these classes and issue the matching mill certificate and third-party test report with your order.
