ISO 4762:2004
Main standard used for the dimensions in this data sheet.
ISO 4762 · 2004
Hexagon socket head cap screw
A cylindrical head with an internal hexagon drive for mechanical assemblies with axial tool access. Screw length determines whether the shank is partially or fully threaded.
DIN 912 · UNI 5931
- Dimensional range
- M3–M48
- Thread
- Metric · coarse pitch
- Configuration
- Thread coverage depends on L
- References
- DIN 912 · UNI 5931
Technical drawing and dimensional range
Reference dimensions M3–M48, with commercial lengths selectable by diameter. Other diameters and lengths can be assessed on request, including dedicated production.
Dimensions in mm. Identification drawing, not a manufacturing drawing.
| M | Pitch P | dk max. | k max. | s | t min. |
|---|---|---|---|---|---|
| 3 | 0.5 | 5.5 | 3 | 2.5 | 1.3 |
| 4 | 0.7 | 7 | 4 | 3 | 2 |
| 5 | 0.8 | 8.5 | 5 | 4 | 2.5 |
| 6 | 1 | 10 | 6 | 5 | 3 |
| 8 | 1.25 | 13 | 8 | 6 | 4 |
| 10 | 1.5 | 16 | 10 | 8 | 5 |
| 12 | 1.75 | 18 | 12 | 10 | 6 |
| 14 | 2 | 21 | 14 | 12 | 7 |
| 16 | 2 | 24 | 16 | 14 | 8 |
| 18 | 2.5 | 27 | 18 | 14 | 9 |
| 20 | 2.5 | 30 | 20 | 17 | 10 |
| 22 | 2.5 | 33 | 22 | 17 | 11 |
| 24 | 3 | 36 | 24 | 19 | 12 |
| 27 | 3 | 40 | 27 | 19 | 13.5 |
| 30 | 3.5 | 45 | 30 | 22 | 15.5 |
| 33 | 3.5 | 50 | 33 | 24 | 18 |
| 36 | 4 | 54 | 36 | 27 | 19 |
| 39 | 4 | 58 | 39 | 27 | 21 |
| 42 | 4.5 | 63 | 42 | 32 | 24 |
| 45 | 4.5 | 68 | 45 | 32 | 26 |
| 48 | 5 | 72 | 48 | 36 | 28 |
Lengths by diameter
Reference thread length b depends on diameter, not on the three ISO 4014 length bands. Short screws may be fully threaded. The b value alone does not define the shank: incomplete thread and plain-shank limits must also be checked for the requested size.
Commercial reference lengths; availability requires confirmation for each configuration. For short screws, check full threading and incomplete thread under the head. The M45 reference thread length remains ND pending resolution of a source discrepancy.
Materials and property classes
| Material | Class / hardness | Configurable range | Supply |
|---|---|---|---|
| Steel to mechanical specification | 8.8 | M3–M24 | On request |
| Steel to mechanical specification | 10.9 | M3–M24 | On request |
| Steel to mechanical specification | 12.9 | M3–M24 | On request |
| A2 stainless steel | 70 | M3–M24 | On request |
| A4 stainless steel | 70 | M3–M24 | On request |
| A4 stainless steel | 80 | M3–M24 | On request |
Other materials and specifications on request
For requirements beyond the tabulated combinations, enquire about aluminium, brass, nylon, duplex, superduplex or an ASTM specification. Alloy or grade, dimensions, mechanical requirements and finish are defined for the enquiry; the geometric reference does not automatically imply conformity with the product standard.
Enquire about another material or ASTM specification
Finishes and treatments
| Finish | Material | Class / hardness | M |
|---|---|---|---|
| Black oxide | Steel to mechanical specification | 8.8 | M3–M24 |
| Electroplated zinc | Steel to mechanical specification | 8.8 | M3–M24 |
| Black oxide | Steel to mechanical specification | 10.9 | M3–M24 |
| Black oxide | Steel to mechanical specification | 12.9 | M3–M24 |
| Plain / as manufactured | A2 stainless steel | 70 | M3–M24 |
| Plain / as manufactured | A4 stainless steel | 70 | M3–M24 |
| Plain / as manufactured | A4 stainless steel | 80 | M3–M24 |
Select the finish for the material/property-class combination. Hydrogen relief and lubrication are separate process requirements, not certificates and not implied by the coating name.
ISO, DIN and UNI: key differences
DIN 912
Related family reference. Confirm edition, tolerances and mechanical requirements before substituting a component specified under a different standard.
UNI 5931
Related family reference. Confirm edition, tolerances and mechanical requirements before substituting a component specified under a different standard.
Documentation
Download Dueemme data sheet ↓| Document | Status |
|---|---|
| Declaration of conformity | Subject to order agreement |
| Material certificate | Subject to order agreement |
| EN 10204 2.2 test report | Subject to order agreement |
| EN 10204 3.1 inspection certificate | Subject to order agreement |
| Dimensional inspection report | Subject to order agreement |
| Coating report | Subject to order agreement |
| Other documentation | Subject to order agreement |
Batch documents are not automatically included: specify your requirements in the RFQ.
Mating components
Match nominal diameter, pitch, strength, material, finish and joint conditions.
Commercial practice also includes class 8.8 bolts, class 8 nuts and 100 HV washers supplied to DIN 125 A / UNI 6592 references. Suitability must be checked against the joint conditions. For ISO 7089 washers, the reference hardness is 200 HV for bolts up to class 8.8 and nuts up to class 8, and 300 HV for bolts up to class 10.9 and nuts up to class 10. Commercial practice and standard requirements remain distinct.
Application sectors
The size you need, including custom specifications
Other diameters, lengths, materials and finishes can be assessed on request. For dedicated production, we agree geometry, requirements and minimum quantities with the customer.
Send your specification →Configure your enquiry
Selections follow the technical combinations in this data sheet. Quantities, delivery terms and documents will be agreed in the quotation.