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General Components · GB/T 78 / ISO 4027

ISO 4027 Engineered Component — GB/T 78 / ISO 4027 (Series 025)

For Engineered Component — GB/T 78 / ISO 4027 (Series 025), ISO 4027 defines dimensions, tolerances and product grades. The sections below describe its scope, what it does NOT cover, and the equivalents across DIN, ISO and ASME.

ISO 4027 — Scope

ISO 4027 specifies the dimensions and tolerances of engineered component — gb/t 78 / iso 4027 (series 025). 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

Equivalent Standards

Where direct equivalents exist (ISO ↔ DIN, ISO ↔ ASME), they are listed on the parent Engineered Component — GB/T 78 / ISO 4027 (Series 025) page. Always confirm against the dimensions on this page, since some "equivalent" standards differ in tolerances and head geometry.

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 025).

Technical Drawing

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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

What does ISO 4027 specify for Engineered Component — GB/T 78 / ISO 4027 (Series 025)?

ISO 4027 specifies the dimensions and tolerances of engineered component — gb/t 78 / iso 4027 (series 025). Material and property class are governed by separate standards in the same family.

What product grades does ISO 4027 define?

ISO 4027 typically distinguishes product grades for precision (A/B) and general engineering (C). The selection for Engineered Component — GB/T 78 / ISO 4027 (Series 025) depends on the precision your application requires.

Does ISO 4027 specify the mechanical strength?

No. ISO 4027 controls only the geometry of engineered component — gb/t 78 / iso 4027 (series 025). 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.

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.