GB/T 6312-2022 English PDF

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GB/T 6312-2022: Micrometer for measuring pipe wall thicknesses
Status: Valid

GB/T 6312: Historical versions

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 6312-2022	189	Add to Cart	3 days	Micrometer for measuring pipe wall thicknesses	Valid
GB/T 6312-2004	239	Add to Cart	3 days	Micrometer for measuring pipe wall thicknesses	Obsolete
GB/T 6312-1986	199	Add to Cart	2 days	Tube micrometers	Obsolete

Similar standards

GB/T 1216   GB/T 22092   GB/T 22097   GB/T 6314   GB/T 6313   

Basic data

Standard ID: GB/T 6312-2022 (GB/T6312-2022)
Description (Translated English): Micrometer for measuring pipe wall thicknesses
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: J42
Word Count Estimation: 9,928
Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration

GB/T 6312-2022: Micrometer for measuring pipe wall thicknesses

---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.
Micrometer for measuring pipe wall thicknesses ICS 17.040.30 CCSJ42 National Standards of People's Republic of China Replacing GB/T 6312-2004 Wall Thickness Micrometer Published on 2022-07-11 2023-02-01 Implementation State Administration for Market Regulation Released by the National Standardization Administration directory Preface I 1 Scope 1 2 Normative references 1 3 Terms and Definitions 1 4 Types and basic parameters 1 4.1 Type 1 4.2 Basic parameters 3 5 Requirements 3 5.1 Appearance 3 5.2 Materials 3 5.3 feet rack 3 5.4 Micrometer screw and anvil 3 5.5 Interaction 3 5.6 Locking device 3 5.7 Force measuring device 3 5.8 Measuring surface 4 5.9 Ruler 4 5.10 Maximum allowable error 4 5.11 Proofreading rod 4 6 Inspection conditions 4 6.1 Check temperature and humidity 4 6.2 Isothermal conditions 4 7 Inspection method 4 7.1 Interaction 4 7.2 Flatness of the measuring surface 5 7.3 Parallelism between the cylindrical anvil and the measuring surface of the micrometer screw 5 7.4 Hardness of the measuring surface5 7.5 feet frame deformation 5 7.6 Maximum allowable error 5 8 Logo and packaging5

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 of Standardization Documents" drafted. This document replaces GB/T 6312-2004 "Wall Thickness Micrometer". Compared with GB/T 6312-2004, except for structural adjustment and editorial changes Besides, the main technical changes are as follows. a) The wall thickness micrometer with the division value of 0.005mm in the applicable scope is deleted (see Chapter 1 of the.2004 edition); b) Changed the definition of wall thickness micrometer (see 3.1, 3.1 of the.2004 edition); c) Delete the terms "maximum allowable error" and "micrometer maximum allowable error" and their definitions (see 3.2 and 3.3 of the.2004 edition); d) Added basic parameters (see 4.2) e) Added the requirements for Type I wall thickness micrometer measuring anvil (see 5.4.2); f) Changed the requirements for type II and III wall thickness micrometer measuring anvils (see 5.4.3, 5.4.2 of the.2004 edition) g) Delete the specified value of locking change (see 5.7 of the.2004 edition); h) Added type III wall thickness micrometer (see Figures 3 and 4.1.4); i) Deleted the requirement for the maximum allowable error of the micrometer head (see 5.10 of the.2004 edition); j) Added the maximum allowable error requirements for type II and III wall thickness micrometers (see 5.10); k) The test method for the parallelism of type III wall thickness micrometer is added (see 7.3); l) The test method for the deformation of the wall thickness micrometer frame of type II and III is added (see 7.5.2); m) The test method for the maximum allowable error has been changed (see 7.6, 6.3 of the.2004 edition). Please note that some content of this document may be patented. The issuing agency of this document assumes no responsibility for identifying patents. This document is proposed by China Machinery Industry Federation. This document is under the jurisdiction of the National Standardization Technical Committee of Measuring Tools and Measuring Instruments (SAC/TC132). This document is drafted by. Qinghai Measuring Tools (Changzhou) Co., Ltd., Chengdu Tool Research Institute Co., Ltd., Chengdu New Quantity Tools Co., Ltd. Division, Guilin Measuring & Cutting Tools Co., Ltd., Qinghai Measuring & Cutting Tools Co., Ltd., Harbin Measuring & Cutting Tools Group Co., Ltd., China Metrology University, Zhejiang Shuanghong Technology Co., Ltd., Guilin Guanglu Digital Measurement and Control Co., Ltd. The main drafters of this document. Ma Shibin, Xu Gang, Wang Xiangen, Wei Gaihong, Huang Dawei, Zhang Wei, He Yixian, Wang Ting, Zhao Jun, Wang Lei, Dong Zhongxin. This document was first published in 1986 and revised for the first time in.2004.This is the second revision. Wall Thickness Micrometer

1 Scope

This document specifies the type and basic parameters, requirements, inspection conditions and inspection of wall thickness micrometers (excluding electronic digital wall thickness micrometers). method, marking and packaging, etc. This document is applicable to wall thickness micrometers (not Including electronic digital wall thickness micrometer).

2 Normative references

The contents of the following documents constitute essential provisions of this document through normative references in the text. Among them, dated citations documents, only the version corresponding to that date applies to this document; for undated references, the latest edition (including all amendments) applies to this document. GB/T 1216 outside micrometer GB/T 1800.2 Product Geometric Specification (GPS) Linear Dimension Tolerance ISO Code System Part 2.Standard Tolerance Zone Code and limit deviation table of hole and shaft GB/T 17163 Basic terminology of geometric measuring instruments GB/T 17164 Terminology of Geometric Measuring Instruments Product Terminology

3 Terms and Definitions

The terms and definitions defined in GB/T 17163, GB/T 17164 and the following apply to this document. 3.1 With spherical measuring surface, cylindrical measuring surface, waist drum-shaped measuring surface or flat measuring surface, it is suitable for measuring the wall thickness of pipes and other special-shaped parts Outer micrometer for wall thickness.

4 Types and basic parameters

4.1 Type 4.1.1 The type of wall thickness micrometer is shown in Figure 1, Figure 2 and Figure 3.The diagrams are for illustration only and do not represent the detailed structure. 4.1.2 Type I wall thickness micrometer The measuring surface of the micrometer screw is a plane, and the measuring surface of the anvil is spherical, which is mainly used for the measurement of the wall thickness of the pipe. 4.1.3 Type II wall thickness micrometer The micrometer screw measuring surface is flat, the measuring anvil is lengthened, and the measuring surface of the measuring anvil is waist drum shape, which is mainly used for arc wall thickness measurement. Measurement. 4.1.4 Type III wall thickness micrometer The measuring surface of the micrometer screw is flat, the measuring anvil is lengthened, and the measuring surface of the measuring anvil is cylindrical, which is mainly used for cylindrical deep holes Measurement of wall thickness. ......

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