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Pins · GB/T 120.1 / ISO 8735

GB Internally Threaded Dowel Pin Dimensions

GB Internally Threaded Dowel Pin Dimensions reference image

For internally threaded dowel pin, GB defines the dimensions, tolerances and product grades. The sections below describe the scope of the document, the properties it deliberately leaves to companion standards, and the equivalent designations across standards bodies.

GB — Scope

GB specifies the dimensions and tolerances of internally threaded dowel pin — gb/t 120.1 / iso 8735 (series 100). 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

GB, alongside the related GB/T 120.1 / ISO 8735 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 GB

Nominal diameter d (mm)Length L (mm)Internal threadMaterialReference standard
416M3Alloy steelISO 8736 / GB/T 120
520M4Alloy steelISO 8736 / GB/T 120
624M4Alloy steelISO 8736 / GB/T 120
830M5Alloy steelISO 8736 / GB/T 120
1040M6Alloy steelISO 8736 / GB/T 120
1250M8Alloy steelISO 8736 / GB/T 120
1660M10Alloy steelISO 8736 / GB/T 120
2080M12Alloy steelISO 8736 / GB/T 120

Companion Standards

GB controls only the geometry of internally threaded dowel pin — gb/t 120.1 / iso 8735 (series 100). 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 GB

Choose GB for international engineering work and OEM supply where ISO standards are the contractual reference. It is the default modern specification for internally threaded dowel pin — gb/t 120.1 / iso 8735 (series 100).

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.

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Specification
Business Information

Dimensions & Specifications (GB/T 120.1 / ISO 8735)

Nominal diameter d (mm)Length L (mm)Internal threadMaterialReference standard
416M3Alloy steelISO 8736 / GB/T 120
520M4Alloy steelISO 8736 / GB/T 120
624M4Alloy steelISO 8736 / GB/T 120
830M5Alloy steelISO 8736 / GB/T 120
1040M6Alloy steelISO 8736 / GB/T 120
1250M8Alloy steelISO 8736 / GB/T 120
1660M10Alloy steelISO 8736 / GB/T 120
2080M12Alloy steelISO 8736 / GB/T 120

Frequently Asked Questions

What product grades does GB define?

GB typically distinguishes product grades for precision (A/B) and general engineering (C). The selection for Internally Threaded Dowel Pin — GB/T 120.1 / ISO 8735 (Series 100) depends on the precision your application requires.

Does GB specify the mechanical strength?

No. GB controls only the geometry of internally threaded dowel pin — gb/t 120.1 / iso 8735 (series 100). 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 GB 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.

When did GB last revise its dimensional table?

ISO standards for internally threaded dowel pin — gb/t 120.1 / iso 8735 (series 100) are reviewed on roughly a five-year cycle. Always reference the latest published edition (or the edition cited contractually); the dimensional table on this page reflects the current commercially-supplied form.

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.