This standard specifies the tolerances for stamped flat washers of product grades A and C for bolts, screws and nuts with a nominal thread diameter of 1 to 150 mm. It is recommended that non-standard washers also adopt these tolerances. GB/T 3103.3-2000 Fastener tolerances Flat washers GB/T3103.3-2000 Standard download decompression password: www.bzxz.net

GB/T 3103.3-2000
Part 3: Plain washers for bolts, screws and nuts This standard is equivalent to the international standard ISO4759-3:2000 "Fastener tolerances product grades A and C".
The general title of GB/T3103 is: "Fastener tolerances", which includes the following parts: GB/T 3103.1—1982
GB/T 3103. 2-1982
Fastener tolerances
Bolts, screws and nuts
Fastener tolerances Bolts, screws and nuts for precision machinery Fastener tolerances Flat washers
-GB/T 3103. 3—2000
Fastener tolerances Heat-resistant threaded connections
-GB/T 3103.4——1992
This standard does not adopt the self-reference attached to ISO4753-3, its content has been listed in the referenced standard (Chapter 2). This standard is a revision of GB/T3103.3-1982. The main revisions are as follows: a) The dimensional tolerance h is not specified for Class C products (Article 3.1); b) "Thickness unevenness Ah\ replaces "parallelism", and this indicator is not required for Class C products (Article 3.5.1); c) Flatness is not required for Class C products (Article 3.5.3); d) Appendix A is added.
This standard replaces GB/T3103.3-1982 from the date of implementation. Appendix A of this standard is a prompt appendix.
This standard is proposed by the State Machinery Industry Bureau. This standard is under the jurisdiction of the National Technical Committee for Standardization of Fasteners, and this standard is drafted by the Mechanical Science Research Institute. This standard is interpreted by the Secretariat of the National Technical Committee for Standardization of Fasteners.300
GB/T3103.3-2000| |tt||ISO Foreword
ISO (International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The development of international standards is usually carried out through ISO technical committees. Each member group can also participate in the committee if it is interested in the projects carried out by a technical committee. Governmental and non-governmental international organizations related to ISO may also participate in this work. ISO has close ties with the International Electrotechnical Commission (IEC) in the field of electrotechnical standardization. The draft international standards adopted by the technical committees are distributed to all member groups for voting. The formal publication of international standards requires at least 75% of the member groups to vote in favor.
International Standard ISO4759-3 was developed by ISO/TC2 Technical Committee on Fasteners. The third edition is a revision of the second edition (ISO 4759-3:1991) has been deleted, revised and supplemented, which is a technical revision. The general name of ISO4759 is "Tolerances for fasteners", which includes the following parts: Part 1: Bolts, screws and nuts with product grades A, B and C Part 2: Bolts, screws and nuts with thread diameters of 1 to 3 mm, product grade F, for precision machinery Part 3: Plain washers for bolts, screws and nuts with product grades A and C Appendix A of this part of ISO4759 is a suggestive appendix. 301
National Standard of the People's Republic of China
Tolerances for fasteners
Plain washers
Tolerances for fasteners-Plain washersGB/T3103.3-2000wwW.bzxz.Net
idt IS0 4759-3:2000
Replaces GB/T3103.3---1982
This standard specifies the tolerances for stamped flat washers of product grades A and C for bolts, screws and nuts with a nominal thread diameter of 1 to 150 mm.
It is recommended that these tolerances also be used for non-standard washers. Note: The product grade is determined by the product quality and the tolerance size. Appendix A (indicative appendix) is extracted from GB/T1800.2 and GB/T1800.4. 2 Referenced standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, 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 standards. GB/T1182—1996 General rules, definitions, symbols and drawing representations for shape and position tolerances (eqvISO1101:1983) GB/T1800.2—1998 Fundamentals of limits and fits Part 2: Basic provisions for tolerances, deviations and fits (eqvISO 286-1:1988)
Limits and fits Standard tolerance grades and limit deviation tables for holes and shafts (eqvISO286-2:1996) GB/T1800.4—1999
Electroplating of threaded fasteners
GB/T 5267--1985
GB/T16671—1996 Maximum material requirements, minimum material requirements and reversibility requirements for shape and position tolerances (eqvISO 2692:1996)
3 Tolerances
The tolerances of washers for product grades A and C are given in Table 1. Unless otherwise specified, the tolerances specified in this standard apply to the dimensions of washers before plating (GB/T5267). If the tolerances do not meet the tolerances specified in this standard and there are legitimate technical reasons, they should be specified in the product standard. When the tolerances specified in this standard and the product standard are different, the latter shall prevail. The provisions and expression methods of shape and position tolerances comply with GB/T1182 and GB/T16671. Approved by the State Administration of Quality and Technical Supervision on September 26, 2000, 302
Implementation on February 1, 2001
3.1 Through hole (stamping)
3.2 Outside diameter (stamping)
3.3 Thickness
3.4 ​​Chamfer
Tear band,
-Tear band
GB/T 3103.3—2000
Product grade
The edge and tear band have not been specified, but will be proposed
h1, collapsed edge and tear band
have not been specified, but will be proposed
h, is the part of the hole within the specified tolerance range of d, h
hz, collapsed edge and tear band have not been specified, but will be proposed. hz is the tolerance of the outer diameter part within the tolerance range specified by dz
0.5
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