DIN 609 specifies the dimensions and tolerances for fitted (reamer) bolts, din 609. The full dimensional table is reproduced below, followed by the DIN, ISO and ASME parts that match or supersede it.
- Standard
- DIN 609
- Product
- Fitted (Reamer) Bolts, DIN 609
- Governing standards
- DIN 609
Equivalence between national standards is dimensional, not always metallurgical. Check the property class separately when substituting.
The table below lists the dimensions catalogued for fitted (reamer) bolts, din 609 under DIN 609. The scope of DIN 609 itself is not summarised here — where a figure matters, confirm it against the published document.
DIN 609 — Scope
The table below lists the dimensions catalogued for fitted (reamer) bolts, din 609 under DIN 609. The scope of DIN 609 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 609. Tolerances for this part are the limits shown against each dimension in the table.
Dimensions Specified by DIN 609
| Thread size | Shank diameter ds k6 (mm) | Reamed hole H7 (mm) | Width across flats s (mm) | Head height k (mm) | Common length range (mm) | Property class | Reference standard |
|---|
| M8 | 9 | 9 | 13 | 5.3 | 30~80 | 8.8 | DIN 609 |
| M10 | 11 | 11 | 17 | 6.4 | 35~100 | 8.8 | DIN 609 |
| M12 | 13 | 13 | 19 | 7.5 | 40~120 | 8.8 | DIN 609 |
| M16 | 17 | 17 | 24 | 10.0 | 50~150 | 8.8 | DIN 609 |
| M20 | 21 | 21 | 30 | 12.5 | 60~180 | 8.8 | DIN 609 |
| M24 | 25 | 25 | 36 | 15.0 | 70~200 | 8.8 | DIN 609 |
Equivalent Standards
Where direct equivalents exist (ISO ↔ DIN, ISO ↔ ASME), they are listed on the parent Fitted (Reamer) Bolts, DIN 609 page.
Always confirm against the dimensions on this page, since some "equivalent" standards differ in tolerances and head geometry.
When to Specify DIN 609
DIN 609 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 bolt to this standard in a non-standard size?
Parts built to DIN 609 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
Fitted 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 Fitted Bolts
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Gearbox & housing assembly
Split housings that must reassemble in exactly the same position.
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Press & die sets
Located joints carrying shear across the parting line.
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Machine tools
Joints where the bolt locates the two halves as well as clamping them.
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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.
Typical applications
- locating two parts within a few hundredths of a millimetre
- reamed H7 holes matched to a k6 ground shank
- transmitting shear on the shank rather than by friction
- 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
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 Fitted Bolts are used, how to specify them, and the cases they are wrong for
