GB/T 192-2025 PDF English
US$215.00 · In stock · Download in 9 secondsGB/T 192-2025: General purpose metric screw threads - Profiles Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedureStatus: Valid GB/T 192: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 192-2025 | English | 215 |
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General purpose metric screw threads - Profiles
| Valid |
| GB/T 192-2003 | English | 159 |
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General purpose metric screw threads -- Basic profile
| Valid |
| GB/T 192-1981 | English | 199 |
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General purpose screw threads--Basic concepts and symbols for tooth shapes and tolerance zone
| Obsolete |
Excerpted PDFs (Download full copy in 9 seconds upon purchase)PDF Preview: GB/T 192-2025
GB/T 192-2025: General purpose metric screw threads - Profiles---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT192-2025
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 21.040.10
CCS J 04
GB/T 192-2025
Replacing GB/T 192-2003
General purpose metric screw threads - Profiles
(ISO 68-1.2023, ISO general purpose screw threads - Basic and design profiles - Part
1.Metric screw threads, MOD)
Issued on: MAY 30, 2025
Implemented on: DECEMBER 01, 2025
Issued by. State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword... 3
1 Scope... 5
2 Normative references... 5
3 Terms and definitions... 5
4 Designations... 5
5 Basic profile... 6
6 Design profile... 8
Foreword
This document was drafted in accordance with the provisions of GB/T 1.1-2020
“Directives for standardization - Part 1.Rules for the structure and drafting of
standardizing documents”.
GB/T 192 “General purpose metric screw threads - Profiles” together with GB/T 193
“General purpose metric screw threads - General plan,” GB/T 196 “General purpose
metric screw threads - Basic dimensions,” GB/T 197 “General purpose metric screw
threads - Tolerances,” GB/T 2516 “General purpose metric screw threads - Limit
deviations,” GB/T 9144 “General purpose metric screw threads - Preferable plan,”
GB/T 9145 “General purpose metric screw threads - Limits of sizes for the screw
threads of medium quality and preferable plan,” and GB/T 15756 “General purpose
metric screw threads - Limits of sizes” constitute the national standard system for
“general purpose metric screw threads.”
This document replaces GB/T 192-2003 “General purpose metric screw threads - Basic
profile.” Compared to GB/T 192-2003, in addition to structural adjustments and
editorial changes, the main technical changes are as follows.
a) ADD the design profile (see Clauses 1 and 6);
b) ADD the clause of symbols (see Clause 4).
This document has modified and adopted ISO 68-1.2023 “ISO general purpose screw
threads - Basic and design profiles - Part 1.Metric screw threads.”
The technical differences between this document and ISO 68-1.2023 and their reasons
are as follows.
- ISO 5408 has been replaced with the normative reference GB/T 14791 (see Clause
3), to adapt to the technical conditions of China and improve operability.
This document has made the following editorial changes.
- To align with existing standards, the standard name has been changed to “General
purpose metric screw threads - Profiles.”
Attention is drawn to the possibility that some of the elements of this document may be
the subject of patent rights. The issuing authority of this document shall not be held
responsible for identifying any or all such patent rights.
This document was proposed by and shall be under the jurisdiction of National
Technical Committee on Screw Thread of Standardization Administration of China
(SAC/TC 108).
General purpose metric screw threads - Profiles
1 Scope
This document specifies the basic and design profiles of general purpose metric screw
threads (general purpose metric screw threads, M).
This document applies to metric fastening screw threads.
2 Normative references
The following referenced documents are indispensable for the application of this
document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
GB/T 14791 Screw threads - Vocabulary (GB/T 14791-2013, ISO 5408.2009, IDT)
3 Terms and definitions
For the purpose of this document, the terms and definitions defined in GB/T 14791
apply.
4 Designations
For the purpose of this document, the following designations apply
D Major diameter of internal thread (nominal diameter)
d Major diameter of external thread (nominal diameter)
D2 Pitch diameter of internal thread
d2 Pitch diameter of external thread
D1 Minor diameter of internal thread
d1 Minor diameter of external thread on basic profile
d3 Minor diameter of external thread on design profile
P Pitch
H Fundamental triangle height
H1 Thread height of internal thread, thread height of external thread on basic
profile
h3 Thread height of external thread on design profile
R Arc radius of fully rounded root of external thread on design profile
R1 Arc radius on partially rounded root corners of external thread on design
profile
5 Basic profile
The basic profile is shown as a thick solid line in Figure 1.The basic profile of internal
and external threads is the same.
The dimensions of the basic profile are listed in Table 1.The dimensions of the basic
profile are calculated using the following formula, with the results rounded to the
nearest sixth decimal place.
6 Design profile
The design profiles of internal and external threads are different, as shown as the thick
solid lines in Figures 2 and 3, respectively.
The dimensions of the design profiles are listed in Table 2.The dimensions of the design
profiles are calculated using the following formulas. The calculated value for the thread
height of external thread h3 is rounded to the nearest sixth decimal place, and the
calculated value for the arc radius of fully rounded root of external thread R is rounded
to the nearest third decimal place. The minimum arc radius on partially rounded root
corners of external thread R1 min is determined according to the following provisions for
partially rounded roots.
The root contour of internal threads is straight and flat. The root can be fully rounded
or partially rounded and located beyond the P/8 flat bottom width. This document does
not specify a limit for the root arc radius. The thread height of internal thread H1 value
is listed in Table 1.
The root contour of external threads is fully rounded or partially rounded with a
continuous and smooth curve (without reverse bends), located below the P/4 flat bottom
width. The root is located in the position of H/6 truncation height. The root form can be
one of the following two types.
- a fully rounded root, with a large circular arc of radius R, tangential to the straight
flanks, see Figure 3 a);
- a partially rounded root, with two small circular arcs of radii R1, tangential to the
straight flanks and the flat on the bottom, see Figure 3 b). The R1 radius value shall
be specified in the threaded product document. Unless otherwise specified, the R1
radius value shall be no less than 0.125 P.
NOTE. A rounded root contour reduces the wear rate of threading tool crest and improves the fatigue
resistance of external threads.
The crest contour of both internal and external threads is straight and flat. Depending
on the thread processing method, the crest contour of both internal and external threads
may be rounded.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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