GB/T 28272-2012Metric screw threads with extra fine pitch - Series and basic dimensions (English PDF)
米制超细牙螺纹 系列和基本尺寸
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Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
May 11, 2012
Implementation date
December 1, 2012
Scope
GB/T 28272-2012 is the English-translated version of 米制超细牙螺纹 系列和基本尺寸.
GB/T 28272-2012 is the Chinese standard "Metric screw threads with extra fine pitch - Series and basic dimensions". Its scope clause reads: This standard specifies the basic model tooth Metric superfine thread diameter and pitch range and basic dimensions.
This standard applies to the field of precision instruments and electronic equipment such as a threaded connection. Its clauses include terms, definitions and code; basic tooth type; diameter and pitch of the standard series.
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Document preview — GB/T 28272-2012
National Standard of the People's Republic of China
- ICS
- 21.040.10
- Classification
- J 04
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
Contents
- Foreword
- 1 Scope
- 2 Normative references
- 3 Terms, definitions and code
- 3.1 Terms and Definitions
- 3.2 Code
- 4 Basic tooth type
1 Scope
This standard specifies the basic model tooth Metric superfine thread diameter and pitch range and basic dimensions.
This standard applies to the field of precision instruments and electronic equipment such as a threaded connection.
2 Normative references
The following documents for the application of this document is essential. For dated references, only the dated edition applies to this article
Member. For undated references, the latest edition (including any amendments) applies to this document.
GB/T 192 ordinary screw threads - Basic model
GB/T 14791 term thread
3 Terms, definitions and code
3.1 Terms and Definitions
Terms and definitions GB/T 14791 defined apply to this document.
3.2 Code
The following codes apply to this document.
D --- basic large diameter internal thread (nominal diameter);
Basic large diameter d --- external thread (nominal diameter);
Basic pitch diameter D2 --- internal threads;
d2 --- basic diameter external thread;
D1 --- basic trail internal threads;
d1 --- basic path external thread;
H --- original height triangle;
P --- pitch.
4 Basic tooth type
Metric same basic tooth superfine thread common thread type and shall comply with the provisions of GB/T 192's.
5 diameter and pitch of the standard series
Metric superfine thread diameter and pitch of the standard series combination should meet the requirements of Table 1.
In Table 1, the diameter should be selected in the same row of the pitch.
Preferred diameter of the first series, the second series followed select diameter, the diameter of the final choice of the third series.
......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.
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