GB/T 2363-2025Accuracy of fine-pitch involute cylindrical gears (English PDF)
小模数渐开线圆柱齿轮精度
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Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
August 29, 2025
Implementation date
March 1, 2026
Scope
GB/T 2363-2025 is the English-translated version of 小模数渐开线圆柱齿轮精度.
GB/T 2363-2025 is the Chinese standard "Accuracy of fine-pitch involute cylindrical gears".
Its scope clause reads: This document specifies the grading method and tolerance values for the surface accuracy of individual small-module involute cylindrical gears within the following parameter range. ---0.1mm<=mn< 0.5mm; ---5<=z<=200; ---0.5mm<=d<=100mm; ---0.2mm<=b<=10mm; ---beta<=45°. in. mn --- Normal module; z --- Number of teeth; d --- pitch circle diameter; b --- Tooth width (axial); beta --- Helix angle.
Note 1.The tolerance value of accuracy is also called the allowable value of deviation. Note 2.The precision grade of the gear obtained according to this document is not directly related to the actual performance of the gear in use.
This document applies to the evaluation of the manufacturing level of small-module gears made of metal and powder metallurgy materials. Its clauses include terms, definitions and symbols.
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Document preview — GB/T 2363-2025
National Standard of the People's Republic of China
- ICS
- 21.200
- Classification
- J 17
- Replacing
- GB/T 2363-1990
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
Contents
- Preface
- Introduction
- 1.Scope
- 2 Normative References
- 3.Terms, Definitions, and Symbols
- 4.Deviation and Tolerance
- 4.1 Deviation
- 4.2 Tolerance
- 5.Tolerance Calculation
- 5.1 Calculation Formula
- 5.2 Application of Formulas
- Appendix A (Informative) Measurement of Radial Composite Deviation
- Appendix B (Informative) Image Inspection Method for Small Module Gear Tooth Profile
- References
1 Scope
This document specifies the grading method and tolerance values for the surface accuracy of individual small-module involute cylindrical gears within the following parameter range.
---0.1mm<=mn< 0.5mm;
---5<=z<=200;
---0.5mm<=d<=100mm;
---0.2mm<=b<=10mm;
---beta<=45°.
in.
mn --- Normal module;
z --- Number of teeth;
d --- pitch circle diameter;
b --- Tooth width (axial);
beta --- Helix angle.
Note 1.The tolerance value of accuracy is also called the allowable value of deviation.
Note 2.The precision grade of the gear obtained according to this document is not directly related to the actual performance of the gear in use.
This document applies to the evaluation of the manufacturing level of small-module gears made of metal and powder metallurgy materials.
2 Normative references
The contents of the following documents, through normative references within the text, constitute essential provisions of this document. Dated citations are not included.
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 2821 Gear Geometric Element Designations
GB/T 3374.1 Gears - Terminology and Definitions - Part 1.Geometric Definitions
GB/T 10095.1-2022 Cylindrical gears - ISO tooth surface tolerance system - Part 1.Definition and permissible values of tooth surface deviations
GB/T 10095.2-2023 Cylindrical gears - ISO tooth surface tolerance classification system - Part 2.Definition and permissible values of radial composite deviation
GB /Z 18620.2-2008 Standard for Inspection of Cylindrical Gears Part 2.Radial Composite Deviation, Radial Runout, Tooth Thickness and Lateral Eccentricity
Gap inspection
3 Terms, Definitions and Symbols
Terms, definitions and symbols defined in GB/T 2821, GB/T 3374.1, GB/T 10095.1-2022 and GB/T 10095.2-2023
The number applies to this document.
GB/T 10087 | GB/T 10086 | GB/T 6404.2 | GB/T 6443 | GB/T 3481.1 | […]
......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 18 pages — is available in the English PDF.
Referenced standards
Normative references
- GB/T 2821Gear -- Symbols for geometrical data
- GB/T 3374.1Vocabulary of gear terms -- Part 1: Definitions related to geometry
- GB/T 10095.1-2022Cylindrical gears - ISO system of flank tolerance classification - Part 1: Definitions and allowable values of deviations relevant to flanks of gear teeth
- GB/T 10095.2-2023Cylindrical gears - ISO system of flank tolerance classification - Part 2: Definitions and allowable values of double flank radial composite deviations
Editions of GB/T 2363
| Edition | Title | Revision | Status |
|---|---|---|---|
| GB/T 2363-2025 | Accuracy of fine-pitch involute cylindrical gears | current edition | Current |
This page sells the current edition, GB/T 2363-2025. Earlier editions are listed for reference only.
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Related Standards
GB/T 10095.1-2022 — Cylindrical gears - ISO system of flank tolerance classification - Part 1: Definitions and allowable values of deviations relevant to flanks of gear teeth
GB/T 10095.2-2023 — Cylindrical gears - ISO system of flank tolerance classification - Part 2: Definitions and allowable values of double flank radial composite deviations
GB/T 2821-2003 — Gear -- Symbols for geometrical data
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