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GB/T 968-2007: Manufacturing tolerances on the threaded of portion taps
Status: Valid GB/T 968: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB/T 968-2007 | English | 209 |
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Manufacturing tolerances on the threaded of portion taps
| Valid |
GB/T 968-2007
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| GB/T 968-1994 | English | 319 |
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Manufacturing tolerances on the threaded portion of taps
| Obsolete |
GB/T 968-1994
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| GB 968-1983 | English | 199 |
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Manufacturing tolerances on the threaded portion of taps
| Obsolete |
GB 968-1983
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Basic data | Standard ID | GB/T 968-2007 (GB/T968-2007) | | Description (Translated English) | Manufacturing tolerances on the threaded of portion taps | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | J41 | | Classification of International Standard | 25.100.50 | | Word Count Estimation | 8,886 | | Date of Issue | 2007-07-26 | | Date of Implementation | 2007-12-01 | | Older Standard (superseded by this standard) | GB/T 968-1994 | | Quoted Standard | GB/T 192; GB/T 193; GB/T 196; GB/T 197 | | Adopted Standard | ISO 2857-1973, MOD | | Drafting Organization | Chengdu Tool Research Institute | | Administrative Organization | National Standardization Technical Committee Tool | | Regulation (derived from) | National Standard Announcement 2007 No.7 (Total No.107) | | Summary | This standard specifies the type of tap thread tooth and its basic dimensions of limit deviations. This standard applies to processing the common thread (GB/T 192, GB/T 193, GB/T 196, GB/T 197) with a tap. | GB/T 968-2007: Manufacturing tolerances on the threaded of portion taps---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.
Manufacturing tolerances on the threaded of portion taps
ICS 25.100.50
J41
National Standards of People's Republic of China
Replacing GB/T 968-1994
Tap thread tolerance
(ISO 2857. 1973, GroundthreadtapsforISO metricthreadsof
Manufacturingtolerancesonthethreadedportion, MOD)
Posted 2007-07-26
2007-12-01 implementation
Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
Standardization Administration of China released
Foreword
This revised standard adopts ISO 2857. 1973 "tolerances 4H to 8H and 4G to 6G coarse and fine pitch ISO metric threads with a molar machine
Tap the threaded portion of the manufacturing tolerances "(in English), as well as supplementary document ISO 2857/A1. 1984 and ISO 2857/A2. 1986.
This standard is based on ISO 2857. 1973, ISO 2857/A1. 1984 and ISO 2857/A2. 1986 redrafted.
This standard and ISO 2857. 1973, ISO 2857/A1. 1984 and ISO 2857/A2. 1986 compared to the following technical differences and knitting
Series of Review.
--- Remove the foreword to international standards;
--- Used instead of using decimal comma ",". ",";
--- "This International Standard" by "this standard";
--- Normative documents column items, ISO 965-1 with our standard GB/T 197 in place, ISO 724 with our standards
GB/T 196 in place;
--- Increased hand tap thread tolerance H4;
--- Deleted the Chapter 5, "tap code and flag";
--- Deleted the Chapter 6, "sample size calculation tap threaded portion."
This standard replaces GB/T 968-1994 "tap thread tolerance."
This standard and GB/T 968-1994 compared to the following editorial changes.
--- Increase the foreword.
Appendix A of this standard is an informative annex.
The standard proposed by China Machinery Industry Federation.
This standard tool by the National Standardization Technical Committee (SAC/TC91) centralized.
This standard was drafted. Chengdu Tool Institute.
The main drafters of this standard. Deng Zhiguang, Zeng Yu ring.
The standard standard replaces the previous editions.
--- GB 968-67, GB 968-83, GB/T 968-1994.
Tap thread tolerance
1 Scope
This standard specifies the type of tap thread tooth and its basic size limit deviation.
This standard applies to the processing of common screw (GB/T 192, GB/T 193, GB/T 196, GB/T 197) with a tap.
2 Normative references
The following documents contain provisions which, through reference in this standard and become the standard terms. For dated references, subsequent
Amendments (not including errata content) or revisions do not apply to this standard, however, encourage the parties to the agreement are based on research
Whether the latest versions of these documents. For undated reference documents, the latest versions apply to this standard.
GB/T 192 ordinary screw threads - Basic model (GB/T 192-2003, ISO 68-1.1998, MOD)
GB/T 193 series ordinary thread diameter and pitch (GB/T 193-2003, ISO 261.1998, MOD)
GB/T 196 common thread basic size (GB/T 196-2003, ISO 724.1993, MOD)
GB/T 197 common thread tolerance (GB/T 197-2003, ISO 965-1.1998, MOD)
3 Thread tolerance
Tap the thread type and size limit deviations in Figure 1 and Table 1 of the regulations.
Es --- diameter upper deviation;
Js --- large diameter lower deviation;
Td2 --- diameter tolerance;
Em --- diameter lower deviation.
Figure 1
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