DIN 912 dimensions — Hex Socket Head Cap Screw
1983-12 edition, withdrawn as a document · 21 sizes, M1.6 – M48 · the part is still made and ordered to it see the cross-reference →
✓We supply to DIN 912. Name it on your order — your drawing does not need changing.
DIN 912 dimensions
| Thread size | PThread Pitch (mm) | sHex Socket Size (mm) | dkHead Diameter (mm) | kNominal Head Height (mm) | bThread Length (mm) | Clearance holefine / medium / coarse (mm) | Tap drillcoarse pitch (mm) |
|---|---|---|---|---|---|---|---|
| M1.6 | 0.35 | 1.5 | 3 | 1.6 | 15 | 1.7 / 1.8 / 2 | 1.25 |
| M2 | 0.4 | 1.5 | 3.8 | 2 | 16 | 2.2 / 2.4 / 2.6 | 1.6 |
| M2.5 | 0.45 | 2 | 4.5 | 2.5 | 17 | 2.7 / 2.9 / 3.1 | 2.05 |
| M3 | 0.5 | 2.5 | 5.5 | 3 | 18 | 3.2 / 3.4 / 3.6 | 2.5 |
| M4 | 0.7 | 3 | 7 | 4 | 20 | 4.3 / 4.5 / 4.8 | 3.3 |
| M5 | 0.8 | 4 | 8.5 | 5 | 22 | 5.3 / 5.5 / 5.8 | 4.2 |
| M6 | 1 | 5 | 10 | 6 | 24 | 6.4 / 6.6 / 7 | 5 |
| M8 | 1.25 | 6 | 13 | 8 | 28 | 8.4 / 9 / 10 | 6.8 |
| M10 | 1.5 | 8 | 16 | 10 | 32 | 10.5 / 11 / 12 | 8.5 |
| M12 | 1.75 | 10 | 18 | 12 | 36 | 13 / 13.5 / 14.5 | 10.2 |
| M14 | 2 | 12 | 21 | 14 | 40 | 15 / 15.5 / 16.5 | 12 |
| M16 | 2 | 14 | 24 | 16 | 44 | 17 / 17.5 / 18.5 | 14 |
| M18 | 2.5 | 14 | 27 | 18 | 48 | 19 / 20 / 21 | 15.5 |
| M20 | 2.5 | 17 | 30 | 20 | 52 | 21 / 22 / 24 | 17.5 |
| M22 | 2.5 | 17 | 33 | 22 | 56 | 23 / 24 / 26 | 19.5 |
| M24 | 3 | 19 | 36 | 24 | 60 | 25 / 26 / 28 | 21 |
| M27 | 3 | 19 | 40 | 27 | 66 | 28 / 30 / 32 | 24 |
| M30 | 3.5 | 22 | 45 | 30 | 72 | 31 / 33 / 35 | 26.5 |
| M36 | 4 | 27 | 54 | 36 | 84 | 37 / 39 / 42 | 32 |
| M42 | 4.5 | 32 | 63 | 42 | 96 | 43 / 45 / 48 | 37.5 |
| M48 | 5 | 36 | 72 | 48 | 108 | 50 / 52 / 56 | 43 |
21 of 21 sizes shown. Clearance holes are fine / medium / coarse to ISO 273; tap drill is for the coarse pitch.
What we supply to DIN 912
3 materials| Material | Property class | Finish |
|---|---|---|
| Carbon Steel | 8.8 | Zinc Plated · Blackened · Phosphate · Plain · Dacromet |
| Alloy Steel | 10.9 · 12.9 | 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 |
|---|---|---|---|---|---|
| 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. |
| 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 | |
| 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. |
| 12.9 | 1220 MPa | Rp0.2 min. 1100 MPa | A min. 8 % | 385 - 435 HV | The highest standard steel class — tooling, dies, hydraulics. Sensitive to hydrogen embrittlement if electroplated. |
These values meet the requirements of ISO 3506-1 / ISO 898-1. We supply to these classes and issue the matching mill certificate and third-party test report with your order.
