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GB/T 15054.2-2018 English PDF

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GB/T 15054.2-2018: Miniature screw threads -- Part 2: Tolerances and limits of size
Status: Valid

GB/T 15054.2: Historical versions

Standard IDUSDBUY PDFLead-DaysStandard Title (Description)Status
GB/T 15054.2-2018239 Add to Cart 3 days Miniature screw threads -- Part 2: Tolerances and limits of size Valid
GB/T 15054.2-1994159 Add to Cart 2 days Miniature screw threads. Generat plan Obsolete

Similar standards

GB/T 13319   GB/T 15054.1   GB/T 15823   GB/T 30565   GB/T 19799.3   

Basic data

Standard ID: GB/T 15054.2-2018 (GB/T15054.2-2018)
Description (Translated English): Miniature screw threads -- Part 2: Tolerances and limits of size
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: J04
Classification of International Standard: 21.040.30
Word Count Estimation: 12,170
Date of Issue: 2018-05-14
Date of Implementation: 2018-10-01
Older Standard (superseded by this standard): GB/T 15054.5-1994; GB/T 15054.4-1994
Regulation (derived from): National Standards Announcement No. 6 of 2018
Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration

GB/T 15054.2-2018: Miniature screw threads -- Part 2: Tolerances and limits of size

---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.
(Small threads Part 2. Tolerances and extreme dimensions) ICS 21.040.30 J04 National Standards of People's Republic of China Replacing GB/T 15054.4-1994, GB/T 15054.5-1994 Small thread part 2. tolerances and limit dimensions Miniaturescrewthreads-Part 2. Tolerancesandlimitsofsize Published on.2018-05-14 2018-10-01 implementation State market supervision and administration China National Standardization Administration issued

Foreword

GB/T 15054 "small thread" is divided into the following two parts. --- Part 1. Teeth, series and basic dimensions; --- Part 2. Tolerances and limit dimensions. This part is the second part of GB/T 15054. This part is drafted in accordance with the rules given in GB/T 1.1-2009. This part replaces GB/T 15054.4-1994 "small thread tolerance" and GB/T 15054.5-1994 "small thread limit size". Compared with GB/T 15054.4-1994 and GB/T 15054.5-1994, the main technical changes in this section are as follows. --- Move the small thread tolerances and limit dimensions with a nominal diameter of 1mm and above to the appendix (see Appendix A, GB/T 15054.4- Chapter 3 of.1994, Chapter 3 of GB/T 15054.5-1994); ---Increase the "thread code" in the thread mark, and mark the position of the left-hand code "LH" before the tolerance band code Move to the tolerance band code (see Chapter 8, Chapter 4 of GB/T 15054.4-1994); --- Remove the 5-level tolerance of the large diameter of the external thread (see 3.2 of GB/T 15054.4-1994); ---Remove the content of the coated thread tolerance band (see 3.4 of GB/T 15054.4-1994); --- Remove the thread's preferred tolerance band content (see 3.5 of GB/T 15054.4-1994); --- Increase the thread limit size of 3 tolerance zones (3G5, 3G6 and 4H6) (see Chapter 9); --- Increase the thread inspection content (see Chapter 10 and Appendix B). This part is proposed and managed by the National Thread Standardization Technical Committee (SAC/TC108). This section drafted by. Zhejiang Changhua Auto Parts Co., Ltd., China Machine Productivity Promotion Center, Qifeng Seiko Technology Co., Ltd. the company. The main drafters of this section. Zhang Yiwei, Li Xiaobin, Chen Yuezhong, Zhang Jiansheng. The previous versions of the standards replaced by this section are. ---GB/T 195-1963; ---GB/T 15054.4-1994; ---GB/T 15054.5-1994. Small thread part 2. tolerances and limit dimensions

1 Scope

This part of GB/T 15054 specifies the tolerances, limit dimensions, marking and inspection of small threads. This section applies to general purpose small threads with a nominal diameter range of 0.3mm~1.4mm. Note. The small thread (S) with a nominal diameter range of 1mm~1.4mm is different from the normal thread (M).

2 Normative references

The following documents are indispensable for the application of this document. For dated references, only dated versions apply to this article. Pieces. For undated references, the latest edition (including all amendments) applies to this document. GB/T 14791 thread terminology

3 Terms and definitions

The terms and definitions defined in GB/T 14791 apply to this document.

4 code

The following codes are applicable to this document. D internal thread basic diameter (nominal diameter) D2 internal thread basic diameter D1 internal thread basic diameter d Basic diameter of external thread (nominal diameter) D2 external thread basic diameter D3 external thread bottom diameter (on the design of the tooth) P pitch Lower deviation of EI internal thread diameter (basic deviation) Es Upper deviation of the external thread diameter (basic deviation) T tolerance TD2 internal thread diameter tolerance TD1 internal thread diameter tolerance Td external thread large diameter tolerance Td2 external thread diameter tolerance Td3 external thread bottom diameter tolerance

5 tolerance zone position

Select the tolerance band position for each diameter according to Table 1. The tolerance band positions of the internal and external threads are shown in Figures 1 and 2, respectively.
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