Skip to content
info@engineeringhardware.com
Request a Quote

Pins · GB/T 120.1 / ISO 8735

T 120.1 Internally Threaded Dowel Pin Dimensions

T 120.1 Internally Threaded Dowel Pin Dimensions reference image

For internally threaded dowel pin, T 120.1 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.

T 120.1 — Scope

T 120.1 specifies the dimensions and tolerances of internally threaded dowel pin — gb/t 120.1 / iso 8735 (series 099). 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

T 120.1, 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 T 120.1

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

Equivalent Standards

Where direct equivalents exist (ISO ↔ DIN, ISO ↔ ASME), they are listed on the parent Internally Threaded Dowel Pin — GB/T 120.1 / ISO 8735 (Series 099) page. Always confirm against the dimensions on this page, since some "equivalent" standards differ in tolerances and head geometry.

When to Specify T 120.1

Choose T 120.1 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 099).

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.

Request a Quote

Adjust the parameters in the drawing above and click "Request this configuration" to send the exact specification straight to this form.

Request a Quotation

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 T 120.1 define?

T 120.1 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 099) depends on the precision your application requires.

Does T 120.1 specify the mechanical strength?

No. T 120.1 controls only the geometry of internally threaded dowel pin — gb/t 120.1 / iso 8735 (series 099). 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 T 120.1 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 T 120.1 last revise its dimensional table?

ISO standards for internally threaded dowel pin — gb/t 120.1 / iso 8735 (series 099) 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.