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
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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;www.bzxz.net 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: GB/T5287 Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.