GB/T 28271-2012 English PDF

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GB/T 28271-2012: Metric screw threads with extra fine pitch -- Tolerances
Status: Valid

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 28271-2012	279	Add to Cart	3 days	Metric screw threads with extra fine pitch -- Tolerances	Valid

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Basic data

Standard ID: GB/T 28271-2012 (GB/T28271-2012)
Description (Translated English): Metric screw threads with extra fine pitch -- Tolerances
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: J04
Classification of International Standard: 21.040.10
Word Count Estimation: 12,185
Quoted Standard: GB/T 193-2003; GB/T 197; GB/T 14791
Regulation (derived from): National Standards Bulletin No. 9 of 2012
Issuing agency(ies): General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China
Summary: This standard specifies the metric fine pitch thread tolerances and markings. This standard applies to precision instruments and electronic equipment and other fields of threaded connections.

GB/T 28271-2012: Metric screw threads with extra fine pitch -- Tolerances

---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.
ICS21.040.10 J04 National Standards of People's Republic of China Ultra-fine tolerances metric thread Issued on. 2012-05-11 2012-12-01 implementation Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China Standardization Administration of China released

Foreword

Superfine metric thread standards include. --- GB/T 28271-2012 "metric superfine thread tolerance"; --- GB/T 28272-2012 "ultra-fine thread metric series and basic dimensions." This standard is the standard metric tolerance of ultra-fine thread. This standard rule according to GB/T 1.1-2009 given draft. This standard by the National Standardization Technical Committee thread (SAC/TC108) and focal points. This standard is drafted by. Ningbo Kowloon Fastener Manufacturing Co., Ltd., machine Productivity Promotion Center. Participated in the drafting of this standard. Chengdu Ai Litas thread Tools Co., Ltd., the national standard of product quality supervision and inspection center. The main drafters of this standard. Xu Yong, Li Xiaobin, Lee Seng Wee, Wang Wei, Wang Feilong. Ultra-fine tolerances metric thread

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; ......

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