DIN 6912 specifies the dimensions and tolerances for low head socket cap screws (din 6912). The full dimensional table is reproduced below, followed by the DIN, ISO and ASME parts that match or supersede it.
- Standard
- DIN 6912
- Product
- Low Head Socket Cap Screws (DIN 6912)
- Governing standards
- DIN 6912
Equivalence between national standards is dimensional, not always metallurgical. Check the property class separately when substituting.
The table below lists the dimensions catalogued for low head socket cap screws (din 6912) under DIN 6912. The scope of DIN 6912 itself is not summarised here — where a figure matters, confirm it against the published document.
DIN 6912 — Scope
The table below lists the dimensions catalogued for low head socket cap screws (din 6912) under DIN 6912. The scope of DIN 6912 itself is not summarised here — where a figure matters, confirm it against the published document.
Tolerance & Product Grades
Product grade is a concept from dimensional fastener standards and does not apply to DIN 6912. Tolerances for this part are the limits shown against each dimension in the table.
Dimensions Specified by DIN 6912
| Thread size | Pitch (mm) | Head diameter dk (mm) | Head height k (mm) | Hex socket s (mm) | Socket depth t (mm) | Max torque vs DIN 912 | Reference standard |
|---|
| M3 | 0.5 | 5.5 | 2.0 | 2.0 | 1.2 | approx. 60% | DIN 6912 |
| M4 | 0.7 | 7.0 | 2.6 | 2.5 | 1.5 | approx. 60% | DIN 6912 |
| M5 | 0.8 | 8.5 | 3.2 | 3.0 | 1.8 | approx. 60% | DIN 6912 |
| M6 | 1.0 | 10.0 | 3.8 | 4.0 | 2.2 | approx. 65% | DIN 6912 |
| M8 | 1.25 | 13.0 | 5.0 | 5.0 | 2.8 | approx. 65% | DIN 6912 |
| M10 | 1.5 | 16.0 | 6.0 | 6.0 | 3.5 | approx. 65% | DIN 6912 |
| M12 | 1.75 | 18.0 | 7.0 | 8.0 | 4.4 | approx. 70% | DIN 6912 |
Companion Standards
A complete specification for low head socket cap screws (din 6912) normally cites several documents: one for the geometry, one for the material or mechanical properties, and one for the finish. DIN 6912 is one of them, not all of them.
When to Specify DIN 6912
DIN 6912 is still widely used in European mechanical engineering and as a cross-reference on legacy drawings; its ISO equivalent is preferred for new designs.
Custom manufacturing · Made to drawing
Need a screw to this standard in a non-standard size?
Parts built to DIN 6912 are already in the catalog, so a special is usually a variation on existing tooling rather than a new design — which is what keeps the cost down. Made by cold heading or warm forging.
Minimum order from 2,000 pieces; samples within 7 days of drawing approval.
Custom screw manufacturingSend a drawing
Applications & Industries
Low Head Socket Cap Screws are bought for a small number of well-defined jobs. These are the ones we ship them for. Stocked from M3 to M12.
Industries that specify Low Head Socket Cap Screws
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Machine tools & fixtures
Counterbores too shallow for a standard cap screw.
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Mould & die making
Fixings in plates where depth is at a premium.
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Robotics & automation
Compact joints in moving assemblies.
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Energy & infrastructure
Tower, pipework, switchgear and plant fixings specified for long service life and inspectable joints.
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Maintenance & MRO
Stocked replacements matched to an existing property class, thread and finish.
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Food, pharma & cleanroom
Stainless assemblies that are washed down, where the finish matters as much as the strength.
Typical applications
- where a standard DIN 912 head would stand proud
- fixings in a shallow counterbore
- joints where the property class is stated on the drawing
- clamping two machined faces to a calculated preload
- bolting brackets, motors and gearboxes to a frame
- assemblies that are dismantled for service and re-torqued
Service conditions to specify against
- Marine and coastal
- Available in A4 (316) stainless for chloride exposure — coastal structures, pool halls, water treatment and deck hardware, where A2 will eventually pit.
- High load
- Supplied in ISO 898-1 property classes, so the joint can be designed to a stated proof load and tightened to a calculated torque rather than by feel.
- Torque and preload
- The joint is designed around bolt tension, so lubrication, coating and the friction coefficient all change the torque figure — state them together.
Where to use something else
- The smaller socket takes less torque than a standard cap screw — do not substitute one into a joint torqued for DIN 912.
- Do not use a machine thread into unthreaded sheet or timber; use a tapping screw, rivet nut or insert made for that parent material.
Full application guide: where Low Head Socket Cap Screws are used, how to specify them, and the cases they are wrong for
