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GB/T 27557-2026Rolling bearings — Linear motion rolling bearings — Identification code (English PDF)

滚动轴承　直线运动滚动支承　代号方法

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Issued by

SAMR; SAC

Level / Type

National · Recommended

Issue date

July 30, 2026

Implementation date

November 1, 2026

Scope

GB/T 27557-2026 is the English-translated version of 滚动轴承　直线运动滚动支承　代号方法.

GB/T 27557-2026 is the Chinese standard "Rolling bearings — Linear motion rolling bearings — Identification code". Its scope clause reads: This document specifies the designation method for linear motion rolling bearings (hereinafter referred to as "bearings").

This document applies to the designation and management of general purpose supports. Its clauses include terms and definitions; composition of the code.

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Document preview — GB/T 27557-2026

National Standard of the People's Republic of China

ICS: 21.100.20
Classification: J 11
Replacing: GB/T 27557-2011

Issued by: State Administration for Market Regulation; Standardization Administration of the PRC

Foreword
1 Scope
2 Normative references

1 Scope

This document specifies the designation method for linear motion rolling bearings (hereinafter referred to as "bearings").

This document applies to the designation and management of general purpose supports.

2 Normative references

For references to documents, only the version corresponding to that date applies to this document; for undated references, the latest version (including all amendments) applies.

This document.

GB/T 6930 Rolling Bearings Vocabulary

GB/T 16940 Dimensions and Tolerances of Rolling Bearings - Sleeve Type Linear Ball Bearings

GB/T 29719 Rolling Bearings - Terminology for Linear Motion Rolling Supports

GB/T 32322.1 Rolling bearings for linear motion, rolling support forming guide pairs - Part 1.Series 1, 2, and 3 - External dimensions and...

tolerance

GB/T 32322.2 Rolling bearings for linear motion - Rolling support forming guide pairs - Part 2.Dimensions and tolerances of series 4 and 5

JB/T 6364 Linear Motion Rolling Bearings - Circulating Needle Roller and Roller Guide Bearings

JB/T 7359 Linear motion rolling bearing needle roller and flat cage assembly

3 Terms and Definitions

The terms and definitions defined in GB/T 6930 and GB/T 29719 apply to this document.

4 Composition of the code

4.1 Overview

The support designation consists of a basic designation, supplementary designation, tolerance grade, and group designation. Their order is as follows.

Basic designation, supplementary designation, tolerance grade, and grouping designation

4.2 Basic Codes

4.2.1 Basic Code Composition

The basic designation consists of the type designation, size designation, and structural type designation. They are arranged according to the specifications in Table 1.

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.

Editions of GB/T 27557

Edition	Title	Revision	Status
GB/T 27557-2026	Rolling bearings — Linear motion rolling bearings — Identification code	current edition	Current
GB/T 27557-2011	Rolling bearings — Linear motion rolling bearings — Identification code	previous edition	In force until 1 November 2026

This page sells the current edition, GB/T 27557-2026. Earlier editions are listed for reference only.

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