ISO 4014:2022
Main standard used for the dimensions in this data sheet.
ISO 4014 · 2022
Hexagon head bolt, partially threaded
A plain shank and coarse metric thread for mechanical joints with a nut or tapped hole. Thread length must be selected together with the bolt length.
DIN 931 · UNI 5737
- Dimensional range
- M4–M48
- Thread
- Metric · coarse pitch
- Configuration
- Partially threaded
- References
- DIN 931 · UNI 5737
Technical drawing and dimensional range
Reference dimensions M4–M48. Select commercial lengths by diameter; other sizes and dedicated production on request. The ISO scope also includes diameters outside this loaded range.
Dimensions in mm. Identification drawing, not a manufacturing drawing.
| M | Pitch P | k | s |
|---|---|---|---|
| 4 | 0.7 | 2.8 | 7 |
| 5 | 0.8 | 3.5 | 8 |
| 6 | 1 | 4 | 10 |
| 7 | 1 | 4.8 | 11 |
| 8 | 1.25 | 5.3 | 13 |
| 10 | 1.5 | 6.4 | 16 |
| 12 | 1.75 | 7.5 | 18 |
| 14 | 2 | 8.8 | 21 |
| 16 | 2 | 10 | 24 |
| 18 | 2.5 | 11.5 | 27 |
| 20 | 2.5 | 12.5 | 30 |
| 22 | 2.5 | 14 | 34 |
| 24 | 3 | 15 | 36 |
| 27 | 3 | 17 | 41 |
| 30 | 3.5 | 18.7 | 46 |
| 33 | 3.5 | 21 | 50 |
| 36 | 4 | 22.5 | 55 |
| 39 | 4 | 25 | 60 |
| 42 | 4.5 | 26 | 65 |
| 45 | 4.5 | 28 | 70 |
| 48 | 5 | 30 | 75 |
Lengths by diameter
Thread length b rule
| L ≤ 125 | 125 < L ≤ 200 | L > 200 |
|---|---|---|
| 2d + 6 | 2d + 12 | 2d + 25 |
The rule applies only to lengths compatible with a partially threaded shank. The selector shows only recorded diameter/length pairs. Do not extend the formulas automatically to every orderable length.
L is the underhead length; b is the reference thread length. Listed lengths are commercial references: an ISO 4014:2022 order also requires confirmation of length range, tolerances and plain shank. Lengths outside the standard series require specific agreement.
Materials and property classes
| Material | Class / hardness | Configurable range | Supply |
|---|---|---|---|
| Steel to mechanical specification | 4.8 | M4–M39 | On request |
| Steel to mechanical specification | 8.8 | M4–M39 | On request |
| Steel to mechanical specification | 10.9 | M4–M39 | On request |
| Steel to mechanical specification | 12.9 | M4–M24 | On request |
| A2 stainless steel | 70 | M4–M24 | On request |
| A4 stainless steel | 70 | M4–M24 | On request |
| A4 stainless steel | 80 | M4–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 |
|---|---|---|---|
| Plain / as manufactured | Steel to mechanical specification | 4.8 | M4–M39 |
| Plain / as manufactured | Steel to mechanical specification | 8.8 | M4–M39 |
| Electroplated zinc | Steel to mechanical specification | 8.8 | M4–M39 |
| Plain / as manufactured | Steel to mechanical specification | 10.9 | M4–M39 |
| Plain / as manufactured | Steel to mechanical specification | 12.9 | M4–M24 |
| Zinc flake | Steel to mechanical specification | 10.9 | M6–M24 |
| Plain / as manufactured | A2 stainless steel | 70 | M4–M24 |
| Plain / as manufactured | A4 stainless steel | 70 | M4–M24 |
| Plain / as manufactured | A4 stainless steel | 80 | M4–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 931:1987
DIN 931-1 withdrawn. ISO/DIN widths across flats: M10 16/17; M12 18/19; M14 21/22; M22 34/32 mm. Also check lengths and product grade.
UNI 5737:1988
Withdrawn without replacement on 31 March 1995. Related historical reference, not an equivalence claim for ISO 4014:2022.
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.