QB/T 2402-1998 Watch case and strap connection dimensions series QB/T2402-1998 Standard download decompression password: www.bzxz.net

QB/T2402—1998
This standard is equivalent to the international standard ISO/DIS3765.2:1997. This standard is a revision of the original GB4048-1983 dimension series of the connection between watch case and watch strap. During the revision process, according to the content of ISO/DIS3765.2, the original GB4048-1983 dimension series of the connection between watch case and watch strap and GB4049-1983 dimension series of watch strap buckle were combined and adjusted into industry standards. Its technical content is equivalent to ISO/DIS3765.2. This standard adds the dimensions and tolerances of watch strap buckles based on the revised ISO/DIS3765.2. The main differences between this standard and the original GB 4048-1983 are: - Chapter 1 adds two types of watch cases and three types of watch strap buckles: Chapter 3 and Chapter 4 are added.
This standard was proposed by the Industry Management Department of the State Administration of Light Industry. This standard is issued by the National Clock and Watch Standardization Center. The drafting unit of this standard is the Clock and Watch Research Institute of China Light Industry Association. The main drafters of this standard are Lin Shuqin and Yang Jianmin. From the date of implementation of this standard, the original GB4048-1983 "Dimension Series of the Connection Parts between Watch Case and Watch Strap" and GB4049-1983 "Dimension Series of Watch Strap Buckles" will be abolished. 131
QB/T2402-1998
ISOForeword
ISO (International Organization for Standardization) is a worldwide association of national standards bodies (ISO member bodies). The work of formulating international standards is usually done by ISO technical committees. Each member body interested in the subject established by the technical committee has the right to participate in the committee. International organizations, both governmental and non-governmental, in liaison with ISO also participate in this work. ISO works closely with the International Electrotechnical Commission (IEC) on all electrical standards.
The draft international standard adopted by the technical committee shall be circulated to the member groups for voting. Only when at least 75% of the member groups vote in favor can it be officially published as an international standard.
International standard ISO3765 was drafted by ISO/TC114 Watch Technical Committee, SC7 General Dimensions Technical Committee. 132
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1 Scope
Light Industry Standard of the People's Republic of China
Watch case and watch strap connection dimension series
This standard specifies the dimensions of the connection between the case and the watch strap and the connection parts. This standard applies to two types of watch cases and three types of watch strap buckles. 2 Referenced standards
QB/T 2402—1998
idt Iso/DIs 3765. 2: 1997
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. At the time of publication of this standard, the versions shown are valid. All standards are subject to revision and parties using this standard should explore the possibility of using the latest versions of the following subtitles. GB/T1803—1979 Tolerances and fit dimensions up to 18 mm tolerance zone for holes and shafts 3 Definitions
This standard adopts the following definitions.
3.1 Case
The protective case on which the watch movement is mounted.
The case is divided into two types:
Type 1: A case with two case corners on each side. The strap is connected between the two case corners with the help of a strap bolt. Type 2: Similar to Type 1 case, but the upper surface of the two case corners has a cover. The strap is connected between the two case corners with the help of a strap bolt. 3.2 Case corners
The part of the case where the strap is connected with the help of a strap bolt. 3.3 Strap bolt
The spring-loaded part connecting the case and the strap. This standard provides three types of strap bolts: Type 1 - strap bolt with two movable pins. Type 2 - strap bolt with one movable pin. Type 3 - curved strap bolt.
4 Types of watch cases and strap bolts
4.1 Types of watch cases
See Figures 1, 2 and 3 for Type 1 and Type 2 watch cases. Approved by Guohao Light Industry Bureau on November 25, 1998
Implemented on June 1, 1999
QB/T 2402—1998
Figure 1 Type 1 watch case with two blind hole shell cornersFigure 2 Type 1 watch case with two through hole shell corners5
Figure 3 Type 2 watch case with a cover in common for two shell corners4.2 Types of watch strap bolts
For type 1, type 2 and type 3 watch strap bolts, see Figures 4, 5 and 6.134
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5 Dimensions and accuracywwW.bzxz.Net
0. 60 12m
QB/T 2402-1998
0.6012min
0. 60 12 min
Figure 4 Type 1 strap bolt with two movable pins
Figure 5 Type 2 strap bolt with one movable pin
Figure 6 Curved strap bolt
The connection dimensions and tolerances of the watch case and strap bolt are shown in Table 1. The upper and lower deviations shall be in accordance with GB/T1803. 135
Hand-held
Strap bolt
Case corner hole
Effective hole
QB/T 2402—1998
Hole depth
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Strap inspection
Axis effective
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