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General Components · GB/T 78 / ISO 4027

ISO 4027 Engineered Component — GB/T 78 / ISO 4027 (Series 026)

ISO 4027 is the international standard for engineered component — gb/t 78 / iso 4027 (series 026). This page sets out what the standard governs, the size range it specifies, and the related standards you will see referenced in datasheets.

ISO 4027 — Scope

ISO 4027 specifies the dimensions and tolerances of engineered component — gb/t 78 / iso 4027 (series 026). 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 4027, alongside the related GB/T 78 / ISO 4027 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 4027

Size designationOuter diameter / width (mm)Length / height (mm)Bore / thread (mm)MaterialReference standard
Size 110206C45 carbon steelGB/T 1804-m
Size 212258C45 carbon steelGB/T 1804-m
Size 3163210C45 carbon steelGB/T 1804-m
Size 4204012C45 carbon steelGB/T 1804-m
Size 5255016C45 carbon steelGB/T 1804-m
Size 6326320C45 carbon steelGB/T 1804-m
Size 7408025C45 carbon steelGB/T 1804-m
Size 85010030C45 carbon steelGB/T 1804-m

Companion Standards

ISO 4027 controls only the geometry of engineered component — gb/t 78 / iso 4027 (series 026). 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 4027

Choose ISO 4027 for international engineering work and OEM supply where ISO standards are the contractual reference. It is the default modern specification for engineered component — gb/t 78 / iso 4027 (series 026).

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
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Dimensions & Specifications (GB/T 78 / ISO 4027)

Size designationOuter diameter / width (mm)Length / height (mm)Bore / thread (mm)MaterialReference standard
Size 110206C45 carbon steelGB/T 1804-m
Size 212258C45 carbon steelGB/T 1804-m
Size 3163210C45 carbon steelGB/T 1804-m
Size 4204012C45 carbon steelGB/T 1804-m
Size 5255016C45 carbon steelGB/T 1804-m
Size 6326320C45 carbon steelGB/T 1804-m
Size 7408025C45 carbon steelGB/T 1804-m
Size 85010030C45 carbon steelGB/T 1804-m

Frequently Asked Questions

Does ISO 4027 specify the mechanical strength?

No. ISO 4027 controls only the geometry of engineered component — gb/t 78 / iso 4027 (series 026). 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 4027 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 ISO 4027 last revise its dimensional table?

ISO standards for engineered component — gb/t 78 / iso 4027 (series 026) 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.

What does ISO 4027 specify for Engineered Component — GB/T 78 / ISO 4027 (Series 026)?

ISO 4027 specifies the dimensions and tolerances of engineered component — gb/t 78 / iso 4027 (series 026). Material and property class are governed by separate standards in the same family.

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.