This standard specifies the flat washers with nominal rule (thread major diameter) of 5-36mm, extra large series, hardness grade of 100HV, and product grade of C. GB/T 5287-2002 Extra large washers Grade C GB/T5287-2002 Standard download decompression password: www.bzxz.net

GB/T5287-2002
This standard is equivalent to the international standard IS07094:2000 "Flat Washer Extra Large Series Product Grade C". This standard is part of the national standard "Flat Washer" product series standards. The series includes: a) GB/T95-2002
Flat Washers
b) GB/T96.1—2002
c) GB/T96.2—2002
d) GB/T97.1—2002
e) GB/T97.2—2002
f) GB/T97.3—2000
g) GB/T 97.4-2002
h) GB/T97.5—2002
i) GB/T848—2002
Grade C;
Large washers
Large washers
Flat washers
Flat washers
Grade A;
Grade C;
Grade A;
Chamfered type Grade A;
Flat washers for pins;
Flat washers
Flat washers
Small washers
For screw and washer assemblies;
For self-tapping screws and washer assemblies;
Grade A;
Extra-large washers
Grade C.
j) GB/T5287—2002
ISO7094 does not specify packaging technical requirements, this standard specifies them (Table 3). ISO7094 does not specify simplified markings, this standard gives simplified marking examples according to the simplification principle of GB/T1237 (5.2). This standard is a revision of GB/T5287-1985, and the main modifications are as follows: a) Specifies the performance level and product level of bolts, screws and nuts applicable to this washer (Chapter 1); preferred dimensions; Table 2 non-preferred dimensions (Tables 1 and 2); b) According to the degree of preference of thread specifications (thread major diameter): Table 1 c) Add nominal specifications: 18, 22, 27 and 33mm (Table 2); d) Give the hardness range and test method corresponding to the hardness grade (Table 3); e) Add non-electrolytic zinc flake coating (Table 3). This standard replaces GB/T5287-1985 from the date of implementation. This standard was proposed by the China Machinery Industry Federation. This standard is under the jurisdiction of the National Technical Committee for Standardization of Fasteners. This standard was drafted by the Mechanical Science Research Institute. This standard is interpreted by the Secretariat of the National Technical Committee for Standardization of Fasteners. 42
GB/T5287—2002
ISOForeword
ISO (International Organization for Standardization) is a worldwide federation of national standard bodies (ISO member bodies) of various countries. The development of international standards is usually carried out through ISO technical committees. Each member body can also participate in the committee if it is interested in the project carried out by a technical committee. Governmental and non-governmental international organizations related to ISO can also participate in this work. ISO has close ties with the International Electrotechnical Commission (IEC) in the field of electrotechnical standardization. The drafting of international standards should be carried out in accordance with the rules given in Part 3 of the ISO/IEC Guide. The draft international standards adopted by the technical committees are circulated to all member bodies for voting. The formal publication of international standards requires at least 75% of the member bodies to vote in favor. Note: Some parts of this international standard may involve patent rights. ISO is not responsible for identifying any or all patent rights in this regard. The international standard ISO7094 was developed by ISO/TC2 Technical Committee on Fasteners. The second edition has deleted and supplemented the first edition (ISO7094:1983) and is a technical revision. 43
1 Scope
National Standard of the People's Republic of China
Extra large washers
Plain washers-Extra large series—ProductgradeCGB/T52872002
eqvISO7094:2000
Replaces GB/T5287—1985
This standard specifies flat washers with a nominal specification (major thread diameter) of 5 to 36 mm, extra large series, hardness grade of 100 HV, and product grade of C.
This washer is suitable for:
Hexagonal head bolts and screws with performance grade up to 6.8 and product grade C; hexagonal nuts with performance grade up to 6 and product grade C. Used for wooden structures.
If dimensions other than those specified in this standard are required, they should be selected from GB/T5286. 2
Cited standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard was published, the versions shown were valid. All standards are subject to revision, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T 90.1--2002
GB/T 90.2-2002
Fastener acceptance inspection (idtISO3269:2000)Fastener marking and packaging
Fastener marking method (eqvISO8991:1986)GB/T1237-2000
Fastener tolerance flat washer drawing (idtISO4759-3:2000)GB/T3103.3—2000
GB/T4340.1---1999
GB/T5267.1—2002
GB/T5267.2-2002
GB/T5286-2001
3 Dimensions
Metallic Vickers hardness test Part 1: Test method (eqvISO6507-1:1997) Electroplating of fasteners (ISO4042:1999, IDT) Non-electrolytic zinc flake coating of fasteners (ISO10683:2000, IDT) Flat washers for bolts, screws and nuts
General scheme (idtIS0)887:2000))
Approved by the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China on December 5, 2002 44
Implementation on June 1, 2003
Nominal specifications
(Major thread diameter d)
Nominal specifications
(Major thread diameter d)
Inner diameter d
Nominal (min)
Inner diameter d
Nominal (min)
Technical conditions and referenced standards
Mechanical properties
GB/T 52872002
Preferred size
Nominal (max)
Table 2 Non-preferred size
Nominal (max)
Hardness grade
Hardness range 2
Product grade
Technical conditions and reference standards
100HV~200HV
GB/T3103.3
Thickness h
Thickness five
Without surface treatment, that is, the gasket should be natural color and coated with anti-rust oil or a coating agreed upon by the supplier and the buyer;
Surface treatment
Surface defects
Acceptance and packaging
1) Other metal materials must be agreed upon by the supplier and the buyer. 2) Hardness test shall be in accordance with GB/T4340.1. Electroplating technical requirements shall be in accordance with GB/T5267.1;
Non-electrolytic zinc flake coating technical requirements shall be in accordance with GB/T5267.2 All tolerances apply to dimensions before coating or plating
Parts are not allowed to have irregular or harmful defects. Washer surface shall not have protruding burrs GB/T90.1, GB/T90.2
Test force: HV30 for nominal thickness h>1.2mm. 45
5 Marking
5.1 Marking method shall be in accordance with GB/T1237.
5.2 Marking example
GB/T 5287—2002
Extra large series, nominal specification 8mm, made of steel with hardness grade 100HV, without surface treatment, product grade C: Marking of flat washers:Www.bzxZ.net
GB/T5287
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