GB/T 1243-2024 English PDF (GB/T1243-2024)

GB/T 1243-2024: Short-pitch transmission precision roller and bush chains, attachments and associated chain sprockets
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GB/T 1243-2024
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 21.220.30
CCS J 18
GB/T 1243-2024 / ISO 606.2015
Replacing GB/T 1243-2006
Short-pitch transmission precision roller and bush chains,
attachments and associated chain sprockets
(ISO 606.2005, IDT)
ISSUED ON. MAY 28, 2024
IMPLEMENTED ON. DECEMBER 01, 2024
Issued by. State Administration for Market Regulation;
National Standardization Administration.
Table of Contents
Foreword... 4
Introduction... 6
1 Scope... 7
2 Normative references... 7
3 Chains... 7
3.1 Terminology of chains and their components... 7
3.2 Marking... 9
3.3 Dimensions... 9
3.4 Performance requirements... 11
3.5 Marking... 17
3.6 Transition chain links... 17
4 Attachments... 17
4.1 Terminology... 17
4.2 General... 21
4.3 Marking... 21
4.4 Dimensions... 21
4.5 Manufacturing... 21
4.6 Marking... 22
5 Sprockets... 22
5.1 Overview... 22
5.2 Terminology... 22
5.3 Sprocket diameter size... 23
5.4 Tooth groove shape... 25
5.5 Tooth height and tooth top circle diameter... 26
5.6 Profile tooth profile... 26
5.7 Radial runout... 27
5.8 Axial runout (oscillation)... 28
5.9 Pitch accuracy of gear teeth... 28
5.10 Number of teeth... 28
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".
This document replaces GB/T 1243-2006 "Short-pitch transmission precision roller and
bush chains, attachments and associated chain sprockets". Compared with GB/T 1243-
2006, in addition to structural adjustments and editorial changes, the main technical
changes are as follows.
- CHANGE the ISO chain number of the A series chain in GB/T 1243-2006 from
"04C, 06C, 08A, 085, 10A, 12A, 16A, 20A, 24A, 28A, 32A, 36A, 40A, 48A" to
the chain number "25, 35, 40, 41, 50, 60, 80, 100, 120, 140, 160, 180, 200, 240",
which is consistent with the ANSI series chain (see Table 1; Table 1 of the 2006
edition);
- CHANGE the footnote a of Figure 3b) from "Chain channel height (h1) is the
rotational clearance between the transition link plate and the straight link plate at
the connection" to "Chain channel height (h1) is the minimum channel height that
allows the assembled chain to pass through" [see Figure 3b; Figure 3b of the 2006
edition];
- CHANGE that "Chains manufactured in accordance with this standard shall be pre-
tensioned; the applied pre-tension load shall be equal to 30% of the minimum
tensile strength value specified in Tables 1 and 2" into that "Chains manufactured
in accordance with this document shall be pre-tensioned; the applied pre-tension
load shall not be less than 30% of the minimum tensile strength value specified in
Tables 1 and 2" (see 3.4.3; 3.4.3 of the 2006 edition);
- ADD the ANSI extra heavy series (HE series) chains (see Table 2).
This document is equivalent to ISO 606.2015 "Short-pitch transmission precision roller
and bush chains, attachments and associated chain sprockets".
Please note that some contents of this document may involve patents. The issuing
agency of this document does not assume the responsibility for identifying patents.
This document was proposed by the China Machinery Industry Federation.
This document shall be under the jurisdiction of the National Chain Transmission
Standardization Technical Committee (SAC/TC 164).
Drafting organizations of this document. Chain Transmission Research Institute of Jilin
University, Hangzhou Donghua Chain Group Co., Ltd., Zhejiang Hengjiu Transmission
Technology Co., Ltd., Jiangsu Shuangling Chain Transmission Co., Ltd., Zhejiang
Short-pitch transmission precision roller and bush chains,
attachments and associated chain sprockets
1 Scope
This document specifies the technical requirements for short pitch precision roller and
bush chains and sprockets, which are suitable for mechanical transmission and similar
applications, including dimensions, tolerances, length measurements, pre-tensioning,
minimum tensile strength, minimum dynamic load strength.
Although Chapter 5 applies to sprockets for bicycles and motorcycles, this document
does not apply to bicycle and motorcycle chains, which are specified in ISO 9633 and
ISO 10190, respectively.
2 Normative references
The contents of the following documents constitute essential provisions of this
document through normative references in the text. Among them, for referenced
documents with dates, only the version corresponding to that date applies to this
document; for referenced documents without dates, the latest version (including all
amendments) applies to this document.
ISO 286-2 Geometrical product specifications (GPS) - ISO code system for
tolerance on linear sizes - Part 2.Tables of standard tolerance classes and limit
deviations for holes and shafts
Note. GB/T 1800.2-2020 Geometrical product specifications (GPS) - ISO code system for
tolerances on linear sizes - Part 2.Tables of standard tolerance classes and limit deviations
for holes and shafts (ISO 286-2.2010, MOD)
ISO 15654 Fatigue test method for transmission precision roller chains and leaf
chains
3 Chains
3.1 Terminology of chains and their components
The terminology of chains and their components is shown in Figures 1 and 2.The
illustrations do not define the actual shape of the chain plates.
GB/T 1243-2024
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 21.220.30
CCS J 18
GB/T 1243-2024 / ISO 606.2015
Replacing GB/T 1243-2006
Short-pitch transmission precision roller and bush chains,
attachments and associated chain sprockets
(ISO 606.2005, IDT)
ISSUED ON. MAY 28, 2024
IMPLEMENTED ON. DECEMBER 01, 2024
Issued by. State Administration for Market Regulation;
National Standardization Administration.
Table of Contents
Foreword... 4
Introduction... 6
1 Scope... 7
2 Normative references... 7
3 Chains... 7
3.1 Terminology of chains and their components... 7
3.2 Marking... 9
3.3 Dimensions... 9
3.4 Performance requirements... 11
3.5 Marking... 17
3.6 Transition chain links... 17
4 Attachments... 17
4.1 Terminology... 17
4.2 General... 21
4.3 Marking... 21
4.4 Dimensions... 21
4.5 Manufacturing... 21
4.6 Marking... 22
5 Sprockets... 22
5.1 Overview... 22
5.2 Terminology... 22
5.3 Sprocket diameter size... 23
5.4 Tooth groove shape... 25
5.5 Tooth height and tooth top circle diameter... 26
5.6 Profile tooth profile... 26
5.7 Radial runout... 27
5.8 Axial runout (oscillation)... 28
5.9 Pitch accuracy of gear teeth... 28
5.10 Number of teeth... 28
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".
This document replaces GB/T 1243-2006 "Short-pitch transmission precision roller and
bush chains, attachments and associated chain sprockets". Compared with GB/T 1243-
2006, in addition to structural adjustments and editorial changes, the main technical
changes are as follows.
- CHANGE the ISO chain number of the A series chain in GB/T 1243-2006 from
"04C, 06C, 08A, 085, 10A, 12A, 16A, 20A, 24A, 28A, 32A, 36A, 40A, 48A" to
the chain number "25, 35, 40, 41, 50, 60, 80, 100, 120, 140, 160, 180, 200, 240",
which is consistent with the ANSI series chain (see Table 1; Table 1 of the 2006
edition);
- CHANGE the footnote a of Figure 3b) from "Chain channel height (h1) is the
rotational clearance between the transition link plate and the straight link plate at
the connection" to "Chain channel height (h1) is the minimum channel height that
allows the assembled chain to pass through" [see Figure 3b; Figure 3b of the 2006
edition];
- CHANGE that "Chains manufactured in accordance with this standard shall be pre-
tensioned; the applied pre-tension load shall be equal to 30% of the minimum
tensile strength value specified in Tables 1 and 2" into that "Chains manufactured
in accordance with this document shall be pre-tensioned; the applied pre-tension
load shall not be less than 30% of the minimum tensile strength value specified in
Tables 1 and 2" (see 3.4.3; 3.4.3 of the 2006 edition);
- ADD the ANSI extra heavy series (HE series) chains (see Table 2).
This document is equivalent to ISO 606.2015 "Short-pitch transmission precision roller
and bush chains, attachments and associated chain sprockets".
Please note that some contents of this document may involve patents. The issuing
agency of this document does not assume the responsibility for identifying patents.
This document was proposed by the China Machinery Industry Federation.
This document shall be under the jurisdiction of the National Chain Transmission
Standardization Technical Committee (SAC/TC 164).
Drafting organizations of this document. Chain Transmission Research Institute of Jilin
University, Hangzhou Donghua Chain Group Co., Ltd., Zhejiang Hengjiu Transmission
Technology Co., Ltd., Jiangsu Shuangling Chain Transmission Co., Ltd., Zhejiang
Short-pitch transmission precision roller and bush chains,
attachments and associated chain sprockets
1 Scope
This document specifies the technical requirements for short pitch precision roller and
bush chains and sprockets, which are suitable for mechanical transmission and similar
applications, including dimensions, tolerances, length measurements, pre-tensioning,
minimum tensile strength, minimum dynamic load strength.
Although Chapter 5 applies to sprockets for bicycles and motorcycles, this document
does not apply to bicycle and motorcycle chains, which are specified in ISO 9633 and
ISO 10190, respectively.
2 Normative references
The contents of the following documents constitute essential provisions of this
document through normative references in the text. Among them, for referenced
documents with dates, only the version corresponding to that date applies to this
document; for referenced documents without dates, the latest version (including all
amendments) applies to this document.
ISO 286-2 Geometrical product specifications (GPS) - ISO code system for
tolerance on linear sizes - Part 2.Tables of standard tolerance classes and limit
deviations for holes and shafts
Note. GB/T 1800.2-2020 Geometrical product specifications (GPS) - ISO code system for
tolerances on linear sizes - Part 2.Tables of standard tolerance classes and limit deviations
for holes and shafts (ISO 286-2.2010, MOD)
ISO 15654 Fatigue test method for transmission precision roller chains and leaf
chains
3 Chains
3.1 Terminology of chains and their components
The terminology of chains and their components is shown in Figures 1 and 2.The
illustrations do not define the actual shape of the chain plates.