GB/T 1973.2-2025 Small cylindrical helical springs—Part 2：Dimension and parameters—Extension springs English, Anglais, Englisch, Inglés, えいご
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ICS 21.160
CCS J26
NATIONAL STANDARD OF THE PEOPLE'S REPUBLIC OF CHINA
GB/T 1973.2-2025
Replaces GB/T 1973.2-2005
Small Cylindrical Helical Springs—Part 2: Dimension and Parameters—Extension Springs
Issued on 2025-08-29
Implemented on 2026-03-01
Issued by
State Administration for Market Regulation
Standardization Administration of China
CONTENTS
1 Scope
2 Normative References
3 Terms and Definitions
4 Symbols, Units and Parameter Nomenclature
5 Spring Working Drawings and Hook Angle Types
6 Materials
7 Manufacturing Tolerances
8 Direction of Coiling
9 Hook Opening Dimensions
10 Surface Treatment
11 Marking
12 Other Technical Requirements for Springs
13 Basic Dimensions and Parameters
1 Scope
This document specifies the marking, dimensions and parameters of small cylindrical helical extension springs.
This document applies to cold-formed cylindrical helical extension springs (center-loop type) with round cross-section wire diameters ranging from 0.16 mm to 0.48 mm for general purposes. Other hook-type extension springs may refer to this standard.
2 Normative References
The following documents contain provisions which, through reference in this text, constitute essential provisions of this document. For dated references, only the edition cited applies. For undated references, the latest edition (including any amendments) applies.
GB/T 1805 Terminology for springs
GB/T 1973.1—2021 Small cylindrical helical springs—Part 1: Technical specifications
GB/T 4357 Cold-drawn carbon spring steel wires
GB/T 4459.4 Mechanical drawings—Representation of springs
GB/T 13911 Marking system for metallic coatings and chemical treatments
GB/T 24588 Stainless spring steel wires
3 Terms and Definitions
The terms and definitions defined in GB/T 1805 apply to this document.
4 Symbols, Units and Parameter Nomenclature
The symbols, units and parameter names given in Table 1 apply to this document.
Table 1 Symbols, Units and Parameter Nomenclature
5 Spring Working Drawings and Hook Angle Types
5.1 Cold-formed cylindrical helical extension springs (hereinafter referred to as "springs") shall be drawn according to GB/T 4459.4.
5.2 Hook angle types are classified as Type A (see Figure 1) and Type B (see Figure 2).
Figure 1 Type A
Figure 2 Type B
6 Materials
Spring material wire diameter shall be 0.16 mm to 0.48 mm, using GB/T 4357 DM grade wires or GB/T 24588 Group B wires. When using GB/T 24588 Group B wires, the designation shall be marked with code "S". Other grades/groups and specifications may be used upon agreement between supplier and purchaser with corresponding marking.
7 Manufacturing Tolerances
Spring rate, outside diameter, free length and hook opening dimensions shall be manufactured to Grade 3 precision per GB/T 1973.1—2021. Other precision grades require mutual agreement and explicit marking.
8 Direction of Coiling
Springs shall be right-hand coiled unless otherwise specified. Left-hand coiled springs shall be marked with "LH".
