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Pins · ISO 8734 / DIN 6325

ISO 8734 Dowel Pins

ISO 8734 is the international standard for dowel pins. This page sets out what the standard governs, the size range it specifies, and the related standards you will see referenced in datasheets.

ISO 8734 — Scope

ISO 8734 specifies the dimensions and tolerances of dowel pins. Material, property class, surface finish and packaging are governed by separate documents in the same standards family (for example ISO 898-1 for the mechanical property classes of bolts and screws).

Tolerance & Product Grades

ISO 8734, alongside the related ISO 8734 / DIN 6325 entries on this site, specifies product grades (typically A or B for fine work and C for general engineering) and tolerance classes for the controlling dimensions. Choose the grade against the precision your application requires.

Dimensions Specified by ISO 8734

Nominal diameter (mm)Diameter toleranceCommon length range (mm)MaterialHardnessReference standardNotes
1.0h64~10Alloy steelHardenedISO 8734 / DIN 6325Both ends chamfered, precision fit
1.2h64~12Alloy steelHardenedISO 8734 / DIN 6325Both ends chamfered, precision fit
1.5h64~16Alloy steelHardenedISO 8734 / DIN 6325Both ends chamfered, precision fit
2.0h66~20Alloy steelHardenedISO 8734 / DIN 6325Both ends chamfered, precision fit
2.5h66~24Alloy steelHardenedISO 8734 / DIN 6325Both ends chamfered, precision fit
3.0h68~30Alloy steelHardenedISO 8734 / DIN 6325Both ends chamfered, precision fit
4.0h68~40Alloy steelHardenedISO 8734 / DIN 6325Both ends chamfered, precision fit
5.0h610~50Alloy steelHardenedISO 8734 / DIN 6325Both ends chamfered, precision fit
6.0h612~60Alloy steelHardenedISO 8734 / DIN 6325Both ends chamfered, precision fit
8.0h616~80Alloy steelHardenedISO 8734 / DIN 6325Both ends chamfered, precision fit
10.0h620~100Alloy steelHardenedISO 8734 / DIN 6325Both ends chamfered, precision fit
12.0h625~120Alloy steelHardenedISO 8734 / DIN 6325Both ends chamfered, precision fit
16.0h630~160Alloy steelHardenedISO 8734 / DIN 6325Both ends chamfered, precision fit
20.0h635~200Alloy steelHardenedISO 8734 / DIN 6325Both ends chamfered, precision fit
25.0h645~200Alloy steelHardenedISO 8734 / DIN 6325Both ends chamfered, precision fit
30.0h650~200Alloy steelHardenedISO 8734 / DIN 6325Both ends chamfered, precision fit
40.0h660~200Alloy steelHardenedISO 8734 / DIN 6325Both ends chamfered, precision fit
50.0h680~200Alloy steelHardenedISO 8734 / DIN 6325Both ends chamfered, precision fit

Companion Standards

ISO 8734 controls only the geometry of dowel pins. The mechanical strength is set by ISO 898-1 (bolts and screws) or ISO 898-2 (nuts); the surface finish is governed by separate finish standards (e.g. ISO 4042 for electroplating). For corrosion testing, the relevant document is ISO 9227 (neutral salt spray).

When to Specify ISO 8734

Choose ISO 8734 for international engineering work and OEM supply where ISO standards are the contractual reference. It is the default modern specification for dowel pins.

Technical Drawing

Customize the parameters below — every spec field is editable, and the drawing redraws to match the values you choose. Changing the size will snap the other fields to that size's standard values; you can then override any individual value.

Sends the selected values to the quote form below.

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Specification
Business Information

Dimensions & Specifications (ISO 8734 / DIN 6325)

Nominal diameter (mm)Diameter toleranceCommon length range (mm)MaterialHardnessReference standardNotes
1.0h64~10Alloy steelHardenedISO 8734 / DIN 6325Both ends chamfered, precision fit
1.2h64~12Alloy steelHardenedISO 8734 / DIN 6325Both ends chamfered, precision fit
1.5h64~16Alloy steelHardenedISO 8734 / DIN 6325Both ends chamfered, precision fit
2.0h66~20Alloy steelHardenedISO 8734 / DIN 6325Both ends chamfered, precision fit
2.5h66~24Alloy steelHardenedISO 8734 / DIN 6325Both ends chamfered, precision fit
3.0h68~30Alloy steelHardenedISO 8734 / DIN 6325Both ends chamfered, precision fit
4.0h68~40Alloy steelHardenedISO 8734 / DIN 6325Both ends chamfered, precision fit
5.0h610~50Alloy steelHardenedISO 8734 / DIN 6325Both ends chamfered, precision fit
6.0h612~60Alloy steelHardenedISO 8734 / DIN 6325Both ends chamfered, precision fit
8.0h616~80Alloy steelHardenedISO 8734 / DIN 6325Both ends chamfered, precision fit
10.0h620~100Alloy steelHardenedISO 8734 / DIN 6325Both ends chamfered, precision fit
12.0h625~120Alloy steelHardenedISO 8734 / DIN 6325Both ends chamfered, precision fit
16.0h630~160Alloy steelHardenedISO 8734 / DIN 6325Both ends chamfered, precision fit
20.0h635~200Alloy steelHardenedISO 8734 / DIN 6325Both ends chamfered, precision fit
25.0h645~200Alloy steelHardenedISO 8734 / DIN 6325Both ends chamfered, precision fit
30.0h650~200Alloy steelHardenedISO 8734 / DIN 6325Both ends chamfered, precision fit
40.0h660~200Alloy steelHardenedISO 8734 / DIN 6325Both ends chamfered, precision fit
50.0h680~200Alloy steelHardenedISO 8734 / DIN 6325Both ends chamfered, precision fit

Frequently Asked Questions

What does ISO 8734 specify for Dowel Pins?

ISO 8734 specifies the dimensions and tolerances of dowel pins. Material and property class are governed by separate standards in the same family.

What product grades does ISO 8734 define?

ISO 8734 typically distinguishes product grades for precision (A/B) and general engineering (C). The selection for Dowel Pins depends on the precision your application requires.

Does ISO 8734 specify the mechanical strength?

No. ISO 8734 controls only the geometry of dowel pins. The mechanical strength is set by ISO 898-1 (bolts / screws) or ISO 898-2 (nuts), and the finish is governed by separate standards.

Can I substitute ISO 8734 for the corresponding DIN standard on a drawing?

On modern drawings the ISO standard is the master reference; the older DIN equivalent is a cross-reference. For most dimensional purposes the parts are interchangeable, but check tolerance grades and the head height — these are the most common points of divergence.

How do I request a quotation?

Use the technical drawing on this page to pick the exact configuration, then submit it with the quote form. We respond within one business day.