ISO 8765 specifies the dimensions and tolerances for hex bolts, fine pitch. The full dimensional table is reproduced below, followed by the DIN, ISO and ASME parts that match or supersede it.
- Standard
- ISO 8765
- Product
- Hex Bolts, Fine Pitch
- Governing standards
- ISO 8765
Equivalence between national standards is dimensional, not always metallurgical. Check the property class separately when substituting.
The table below lists the dimensions catalogued for hex bolts, fine pitch under ISO 8765. The scope of ISO 8765 itself is not summarised here — where a figure matters, confirm it against the published document.
ISO 8765 — Scope
The table below lists the dimensions catalogued for hex bolts, fine pitch under ISO 8765. The scope of ISO 8765 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 ISO 8765. Tolerances for this part are the limits shown against each dimension in the table.
Dimensions Specified by ISO 8765
| Size | Fine pitch (mm) | Width across flats s (mm) | Head height k (mm) | Stress area As (mmu00b2) | Common length range (mm) | Property class | Reference standard |
|---|
| M8 | 1.0 | 13.0 | 5.3 | 39.2 | 20~80 | 8.8 / 10.9 | ISO 8765 |
| M10 | 1.25 | 16.0 | 6.4 | 61.2 | 25~100 | 8.8 / 10.9 | ISO 8765 |
| M12 | 1.25 | 18.0 | 7.5 | 92.1 | 30~120 | 8.8 / 10.9 | ISO 8765 |
| M14 | 1.5 | 21.0 | 8.8 | 125.0 | 35~140 | 8.8 / 10.9 | ISO 8765 |
| M16 | 1.5 | 24.0 | 10.0 | 167.0 | 40~160 | 8.8 / 10.9 | ISO 8765 |
| M20 | 1.5 | 30.0 | 12.5 | 272.0 | 50~200 | 8.8 / 10.9 | ISO 8765 |
| M24 | 2.0 | 36.0 | 15.0 | 384.0 | 60~240 | 8.8 / 10.9 | ISO 8765 |
Equivalent Standards
Where direct equivalents exist (ISO ↔ DIN, ISO ↔ ASME), they are listed on the parent Hex Bolts, Fine Pitch page.
Always confirm against the dimensions on this page, since some "equivalent" standards differ in tolerances and head geometry.
Companion Standards
A complete specification for hex bolts, fine pitch normally cites several documents: one for the geometry, one for the material or mechanical properties, and one for the finish. ISO 8765 is one of them, not all of them.
Custom manufacturing · Made to drawing
Need a bolt to this standard in a non-standard size?
Parts built to ISO 8765 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 hot forging.
Minimum order from 2,000 pieces; samples within 7 days of drawing approval.
Custom bolt manufacturingSend a drawing
Applications & Industries
Hex Bolts are bought for a small number of well-defined jobs. These are the ones we ship them for. Stocked from M8 to M24.
Industries that specify Hex Bolts
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Automotive & transport
Chassis, driveline and body fixings that see vibration and are assembled to a controlled preload.
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Steel fabrication
Bolted connections in frames, enclosures, walkways and weldments, on the bench and on site.
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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.
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Machine building & OEM
The default fastener on production equipment: covers, brackets, motor mounts and sub-assemblies tightened to a specified torque.
Typical applications
- 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
- 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 Hex Bolts are used, how to specify them, and the cases they are wrong for
