GB/T 157-2025 English PDF

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GB/T 157-2025: Geometrical product specifications (GPS) - Series of conical tapers and taper angles
Status: Valid

GB/T 157: Historical versions

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 157-2025	239	Add to Cart	3 days	Geometrical product specifications (GPS) - Series of conical tapers and taper angles	Valid
GB/T 157-2001	239	Add to Cart	3 days	Geometrical product specifications (GPS) -- Series of conical tapers and taper angles	Valid
GB/T 157-1989	199	Add to Cart	2 days	Series of conical tapers and taper angles	Obsolete

Similar standards

JJG 818   JJG 517   JJG 1114   GB/T 18779.4   GBZ/T 157   

Basic data

Standard ID: GB/T 157-2025 (GB/T157-2025)
Description (Translated English): Geometrical product specifications (GPS) - Series of conical tapers and taper angles
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: A52
Classification of International Standard: 17.040.01
Word Count Estimation: 11,171
Date of Issue: 2025-05-30
Date of Implementation: 2025-09-01
Older Standard (superseded by this standard): GB/T 157-2001
Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration

GB/T 157-2025: Geometrical product specifications (GPS) - Series of conical tapers and taper angles

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
ICS 17.040.01 CCSA52 National Standard of the People's Republic of China Replaces GB/T 157-2001 Product Geometric Specification (GPS) Cone taper and cone angle series (ISO 1119.2011,MOD) Released on 2025-05-30 2025-09-01 Implementation State Administration for Market Regulation The National Standardization Administration issued

Table of contents

Preface III 1 Scope 1 2 Normative references 1 3 Terms and Definitions 1 4 Series Value 1 Appendix A (Informative) Relationship with GPS Matrix Model 5 A.1 Overview 5 A.2 Information about the standard and its use 5 A.3 Position in the GPS matrix model 5 A.4 Related standards 5 References 6

Foreword

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1.Structure and drafting rules for standardization documents" Drafting. This document replaces GB/T 157-2001 "Technical Specification for Product Geometry (GPS) Cone and Cone Angle Series" and Compared with GB/T 157-2001, the main technical changes are as follows. --- Changed the scope (see Chapter 1, Chapter 1 of the.2001 edition); --- Changed the introductory words of terms and definitions (see Chapter 3, Chapter 3 of the.2001 edition); --- Deleted the term and definition of "conical surface" (see 3.1 of the.2001 edition); --- Deleted the term and definition of "cone" (see 3.2 of the.2001 edition); --- Deleted the term and definition of "cone angle (α)" (see 3.3 of the.2001 edition); --- Deleted the term and definition of "taper (C)" (see 3.4 of the.2001 edition); --- Adjust "The taper and cone angle series of cones for specific purposes" from the appendix to the main text, and add some values (see Chapter 4,.2001 Appendix A of the.2001 edition); --- Added "The dimensions and tolerances of cones shall comply with the provisions of GB/T 15754" (see Chapter 4); --- Change “Jacob taper” to “Jagg taper” (see Chapter 4, Appendix A of the.2001 edition). This document is modified to adopt ISO 1119.2011 "Geometrical Product Specification (GPS) Conicity and angle series of cones". The technical differences between this document and ISO 1119.2011 and their reasons are as follows. --- ISO 3040 was replaced by the normative reference GB/T 15754 to adapt to my country's technical conditions and increase operability (see Section 3 and Chapter 4). The following editorial changes were made to this document. ---Change the initial value 7∶24 in Table 2 from 16.59429008° to 16.59428994°, and 16°35'39.4443″ to 16°35' 39.4438″, this is a calculation error in the original text; ---Change the initial value 1∶9 in Table 2 from 6°41'34.7769″ to 6°21'34.7769″, which is a calculation error in the original text; --- Deleted Note 1 in Table 2 to align with the description in Chapter 4. Please note that some of the contents of this document may involve patents. The issuing organization of this document does not assume the responsibility for identifying patents. This document is proposed and coordinated by the National Technical Committee for Standardization of Product Geometry Technical Specifications (SAC/TC240). This document was drafted by. Qingdao City University, Xiamen Metrology Verification and Testing Institute, China Machinery Research Institute of Standards and Technology (Beijing) Co., Ltd., Pan Asia Technical Automotive Center Co., Ltd., Heilongjiang Metrology Verification and Testing Institute, Sichuan Vocational and Technical College, China University of Metrology, Shanghai University Jiangsu University of Science and Technology, Zhejiang University, Taizhou Eastern CNC Equipment Co., Ltd., Wenling Machine Tool Equipment Industry Association, China Machine Productivity Promotion Association PROGRESS CENTRE LIMITED. The main drafters of this document are. Nie Sen, Zeng Yongwei, Zhu Yue, Hu Min, Zhang Yongchen, Qiu Humiao, Yu Jing, Wei Qingyue, Li Ming, Xu Xusong, Cao Yanlong, Zhuo Jun, Yang Ding, Zhao Linggang, Ye Weijie, and Weng Zhaonan. This document was first issued in 1989, revised for the first time in.2001, and this is the second revision. Product Geometric Specification (GPS) Cone taper and cone angle series

1 Scope

This document provides the following information for engineering technology. The taper and cone angle series of general purpose cones and their calculated values. This document is applicable to smooth cones, not to pyramids, tapered threads, bevel gears, etc.

2 Normative references

The contents of the following documents constitute essential clauses of this document through normative references in this document. For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to This document. GB/T 15754 Product Geometry Technical Specification (GPS) Dimensions and Tolerances Cones (GB/T 15754-2025, ISO 3040.2016, MOD)

3 Terms and definitions

The terms and definitions defined in GB/T 15754 apply to this document.

4 Series Values

Table 1 gives the initial values of the taper and cone angle series of general-purpose cones. When selecting, it is advisable to give priority to series 1 to reduce the number of taper zeros. The range of tools, gauges and measuring instruments required for the production of parts. Table 2 should be used only in the specific circumstances indicated in the last column of the table. To facilitate the design, production and control of conical parts, the estimated values of cone angle or taper are given in Table 1, and the number of significant digits can be determined as needed. The dimensions and tolerances of cones shall comply with the requirements of GB/T 15754. Table 1 Taper and cone angle series of general purpose cones Nominal value Initial value estimation Series 1 Series 2 Cone Angle (α) Degrees, minutes, seconds (°)(')(″) (°) radian rad Taper (C) 120° - - 2.09439510 1∶0.2886751 90° - - 1.57079633 1∶0.5000000 75° - - 1.30899694 1∶0.6516127 ......

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