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GB/T 39542.2-2025: Mechanical pencils for technical drawings - Part 2: Black leads - Classification and dimensions
Status: Valid GB/T 39542.2: Evolution and historical versions
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Mechanical pencils for technical drawings - Part 2: Black leads - Classification and dimensions
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GB/T 39542.2-2025
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| GB/T 39542.2-2020 | English | 114 |
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Mechanical pencils for technical drawings - Part 2: Black leads - Classification and dimensions
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GB/T 39542.2-2020
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Basic data | Standard ID | GB/T 39542.2-2025 (GB/T39542.2-2025) | | Description (Translated English) | Mechanical pencils for technical drawings - Part 2: Black leads - Classification and dimensions | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | Y50 | | Classification of International Standard | 97.180 | | Word Count Estimation | 10,144 | | Date of Issue | 2025-05-30 | | Date of Implementation | 2025-05-30 | | Older Standard (superseded by this standard) | GB/T 39542.2-2020 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | GB/T 39542.2-2025: Mechanical pencils for technical drawings - Part 2: Black leads - Classification and dimensions
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ICS 97.180
CCSY50
National Standard of the People's Republic of China
Replaces GB/T 39542.2-2020
Technical drawing mechanical pencil
Part 2.Classification and dimensions of black lead
(ISO 9177-2.2022, IDT)
Released on 2025-05-30
2025-05-30 Implementation
State Administration for Market Regulation
The National Standardization Administration issued
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 is Part 2 of GB/T 39542 "Mechanical pencils for technical drawing". GB/T 39542 has published the following parts.
--- Part 1.Classification, dimensions, performance requirements and tests;
--- Part 2.Classification and dimensions of black lead cores;
--- Part 3.Bending strength of black lead core HB lead.
This document replaces GB/T 39542.2-2020 "Mechanical pencils for technical drawing - Part 2.Classification and dimensions of black lead cores"
Compared with GB/T 39542.2-2020, in addition to structural adjustments and editorial changes, the main technical changes are as follows;
a) The definitions of black lead and hardness grade have been changed (see 3.1, 3.2, 3.1, 3.2 of the 2020 edition);
b) Change graphite lead core to clay lead core (see 3.1.2, 3.1.2 of the 2020 edition).
This document is equivalent to ISO 9177-2.2022 "Mechanical pencils for technical drawing - Part 2.Classification and dimensions of black lead cores".
The following minimal editorial changes were made to this document.
--- A footnote is added to Table 2.
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 was proposed by China Light Industry Federation.
This document is under the jurisdiction of the National Technical Committee for Standardization of Pen Manufacturing (SAC/TC378).
This document was drafted by. Harbin Tiantan Pencil Co., Ltd., Shangzhi Pearl Pen Co., Ltd., Heilongjiang Taibi Stationery
Co., Ltd., Beifa Group Co., Ltd., Foshan Sanshui Yongshenghua Stationery Co., Ltd., Heshan Jiayi Stationery Industrial Co., Ltd.,
Haichenguang Stationery Co., Ltd., Shangzhi Baosen Wood Industry Co., Ltd., Wenzhou Blueprint Stationery Co., Ltd., Zhejiang Hongxing Stationery
Limited company.
The main drafters of this document. Zhang Xiaoliang, Jin Shuangxi, and Long Shuiyun.
The previous versions of this document and the documents it replaces are as follows.
---First published in 2020 as GB/T 39542.2-2020;
---This is the first revision.
Introduction
Mechanical pencils are one of the most popular writing tools among consumers. Mechanical pencils are divided into general-purpose mechanical pencils according to different usage occasions.
and technical drawing mechanical pencils to meet the evolving market needs. The third edition of ISO 9177-1 in.2016 changed the main elements of the standard name to
The second edition of ISO 9177-2 and ISO 9177-3 in 2022 also made the same adjustment, and the technical content is only
Limited to technical drawing mechanical pencils and their leads to distinguish them from general purpose mechanical pencils.
GB/T 39542 is intended to consist of three parts.
--- Part 1.Classification, dimensions, performance requirements and tests. The purpose is to establish the quality requirements for mechanical pencils suitable for technical drawing
and test methods.
--- Part 2.Classification and dimensions of black lead. The purpose is to establish the basic qualities of black lead for mechanical pencils suitable for technical drawing.
Quantity requirements.
--- Part 3.Bending strength of HB black lead. The purpose is to establish the HB black lead suitable for technical drawing mechanical pencils
Requirements and test methods for core bending strength.
Technical drawing mechanical pencil
Part 2.Classification and dimensions of black lead
1 Scope
This document specifies the assortment and dimensions of black leads for mechanical pencils used for technical drawing.
This document applies to two types of black lead.
---Resin lead (marked with the letter "P");
---Clay lead (marked with the letter "C").
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.
ISO 128-2 Technical product documentation (TPD) General principles for drawing Part 2.Basic rules for drawing
lines]
Note. GB/T 39542.1-2020 Mechanical pencils for technical drawing Part 1.Classification, dimensions, performance requirements and tests (ISO 9177-1.2016, IDT)
3 Terms and definitions
For the purposes of this document, the terms and definitions defined in ISO 9177-1 and the following apply.
ISO and IEC maintain terminology databases used for standardization at the following websites.
3.1
Black lead
A solid writing material containing carbon (such as graphite) and a binder.
NOTE. The black line produced by the lead is erasable.
3.1.1
Resin lead polymerlead
Black lead with an organic polymer as binder.
3.1.2
Clay Lead
Black lead with clay as binder.
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