GB/T 28271-2012Metric screw threads with extra fine pitch - Tolerances (English PDF)
米制超细牙螺纹 公差
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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 28271-2012 is the English-translated version of 米制超细牙螺纹 公差.
GB/T 28271-2012 is the Chinese standard "Metric screw threads with extra fine pitch - Tolerances". Its scope clause reads: This standard specifies the tolerances and ultra-fine pitch thread metric.
This standard applies to the field of precision instruments and electronic equipment such as a threaded connection. Its clauses include terms, definitions and code.
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Document preview — GB/T 28271-2012
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
- 1 Scope
- 2 Normative references
- 3 Terms, definitions and code
- 3.1 Terms and Definitions
- 3.2 Code
1 Scope
This standard specifies the tolerances and ultra-fine pitch thread metric.
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 193-2003 common thread diameter and pitch series
GB/T 197 common thread tolerance
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;
The basic trail d1 --- external thread (basic type upper teeth);
d3 --- small-diameter external thread (see Figures 2 and 3);
P --- pitch;
Ph --- lead;
H --- original height triangle;
S --- short screwing length group;
N --- Medium screwing length group;
T --- tolerance;
TD2 --- internal thread diameter tolerance;
Td2 --- outer thread diameter tolerance;
TD1 --- threaded trails tolerance;
Td --- large diameter external thread tolerance;
ES --- the deviation of the thread diameter;
......
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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