GB/T 9074.31-2017 PDF English
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GB/T 9074.31-2017: Conical spring washers for assemblies---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/GBT9074.31-2017
Conical spring washers for assemblies
ICS 21.060.30
J13
National Standards of People's Republic of China
Tapered elastic washer for assembly
Released on.2017-12-29
2018-04-01 implementation
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China
China National Standardization Administration issued
Foreword
This part is one of the national standards for the “fastener assembly” series. The series includes.
---GB/T 9074.1 bolt or screw and flat washer assembly;
---GB/T 9074.2 cross recessed pan head screw and outer serrated lock washer assembly;
---GB/T 9074.3 cross recessed pan head screw and spring washer assembly;
---GB/T 9074.4 cross recessed pan head screw, spring washer and flat washer assembly;
---GB/T 9074.5 cross recessed small pan head screw and flat washer assembly;
---GB/T 9074.7 cross recessed small pan head screw and spring washer assembly;
---GB/T 9074.8 cross recessed small pan head screw, spring washer and flat washer assembly;
---GB/T 9074.9 cross recessed countersunk head screw and tapered lock washer assembly;
---GB/T 9074.10 cross recessed countersunk head screw and tapered lock washer assembly;
---GB/T 9074.11 Cross recessed hex head bolt and flat washer assembly;
---GB/T 9074.12 cross recessed hex head bolt and spring washer assembly;
---GB/T 9074.13 Cross recessed hex head bolts, spring washers and flat washer assemblies;
---GB/T 9074.15 Hex head bolt and spring washer assembly;
---GB/T 9074.16 Hex head bolt and outer serrated lock washer assembly;
---GB/T 9074.17 Hex head bolts, spring washers and flat washer assemblies;
---GB/T 9074.18 self-tapping screws and flat washer assemblies;
---GB/T 9074.20 cross recessed hex head self-tapping screws and flat washer assembly;
---GB/T 9074.26 Spring washers for assemblies;
---GB/T 9074.27 External sawtooth lock washer for assembly;
---GB/T 9074.28 Conical locking washer for assembly;
---GB/T 9074.31 Conical elastic washers for assemblies;
---GB/T 9074.32 Bolt or screw and tapered elastic washer assembly.
This part is the 31st part of GB/T 9074.
This part is drafted in accordance with the rules given in GB/T 1.1-2009.
This part was proposed by the China Machinery Industry Federation.
This part is under the jurisdiction of the National Fastener Standardization Technical Committee (SAC/TC85).
This section is responsible for drafting the unit. China Machine Productivity Promotion Center.
Participated in the drafting of this section. Anhui Ningguo Dongbo Fastener Co., Ltd., Shanghai Balling Standard Parts Co., Ltd., Machinery Industry
Use the product quality supervision and testing center.
This part is explained by the National Fastener Standardization Technical Committee.
Tapered elastic washer for assembly
1 Scope
This part of GB/T 9074 specifies the type dimensions, technical conditions and markings of tapered elastic washers for assemblies.
This section applies to tapered washers for bolts or screws and tapered washer assemblies in accordance with GB/T 9074.32 (hereinafter referred to as pads)
ring). This section applies to bolts or screws with specifications of 2.5mm~12mm and performance grades of 8.8 and 10.9 (GB/T 3098.1)
The gasket used. For bolts or screws with a performance rating below 8.8, the performance of the gasket will be significantly reduced due to deformation of the contact surface.
Note. After installation with a sufficiently high preload, the gasket prevents preload loss due to deformation and creep. Residual elastic force according to GB/T 94.4
Can be used as a gasket for initial performance evaluation. Under lateral load, the loosening performance cannot be guaranteed, so it is only used for short bolts that mainly bear axial loads.
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 90.1 fastener acceptance inspection
GB/T 90.2 Fastener Marking and Packaging
GB/T 94.4 Elastic washer technical condition Conical elastic washer
GB/T 1237 fastener marking method
GB/T 5267.1 fastener plating
GB/T 5267.2 fastener non-electrolytic zinc sheet coating
3 size
The dimensions of the gasket are shown in Figure 1 and Table 1.
Dimensional tolerances apply before plating.
figure 1
Table 1 Dimensions are in millimeters
Specifications 2.5a 3a 3.5a 4 5 6 8 10 12
D1
Max 2.35 2.85 3.32 3.72 4.67 5.62 7.55 9.45 11.18
Nominal
=min
2.25 2.75 3.20 3.60 4.55 5.50 7.40 9.30 11.00
D2
Nominal
=max
6 7 8 9 11 14 18 23 29
Min 5.70 6.64 7.64 8.64 10.57 13.57 17.57 22.48 28.48
Max 0.55 0.70 0.90 1.10 1.40 1.70 2.20 2.70 3.30
Min 0.45 0.50 0.70 0.90 1.00 1.30 1.80 2.30 2.70
Hb,c
Max 0.72 0.85 1.06 1.30 1.55 2.60 3.10 3.60 4.10
Min 0.61 0.72 0.92 1.12 1.35 2.30 2.80 3.30 3.80
Quality of every 1000 pieces of steel washer
Quantity (ρ=7.85kg/dm3)≈
Kg
0.10 0.15 0.27 0.42 0.74 1.53 3.32 6.82 13.30
Applicable thread size M2.5 M3 M3.5 M4 M5 M6 M8 M10 M12
The residual elastic force of these specifications is not specified in aGB/T 94.4.
b Accepted at the maximum size when delivered.
c After the test, it should meet the minimum free height specified in GB/T 94.4.
4 Technical conditions and reference standards
The technical conditions and reference standards are shown in Table 2.
Table 2 Technical conditions and reference standards
material
Steel spring steel
Grade material grades are optional by the manufacturer
Standard GB/T 94.4
hardness
Range 420HV~490HV
Standard GB/T 94.4
Permanent deformation GB/T 94.4
Continuous load GB/T 94.4
Flexible GB/T 94.4
Surface treatment
Not treated;
Electroplating technology requirements are in accordance with GB/T 5267.1;
Non-electrolytic zinc sheet coating technology requirements according to GB/T 5267.2;
For other technical requirements or surface treatment, the supply and demand agreement
Surface-defective parts are not permitted to have irregular or harmful defects. No burr on the surface of the gasket
Acceptance and packaging GB/T 90.1, GB/T 90.2
5 mark
5.1 Marking method
The marking method is specified in GB/T 1237.
5.2 Tag example
Markings for tapered spring washers with 8mm, spring steel, untreated surface and 420HV~490HV hardness.
Washer GB/T 9074.31 8
references
[1] GB/T 3098.1-2010 Mechanical properties of fasteners Bolts, screws and studs (ISO 898-1.2009, MOD)
[2] GB/T 9074.32-2017 bolt or screw and tapered spring washer assembly
7102-
13 4709
T/
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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