GB/T 5287-2002 in English

《GB/T 5287-2002特大垫圈 C级》由TC85（全国紧固件标准化技术委员会）归口，主管部门为中国机械工业联合会。
本标准规定了公称规则（螺纹大径）5-36mm、特大系列、硬度等级为100HV级、产品等级为C级的平垫圈。

1 Scope

This standard specifies the characteristics of extra-large-series, product-grade-C plain washers in the 100 HV hardness class, of nominal sizes (nominal thread diameters) ranging from 5 mm to 36 mm inclusive.

These washers are suitable for:

— hexagon bolts and screws of product grade C in property classes up to and including 6.8;

— hexagon nuts of product grade C in property classes up to and including 6.

Used in timber structures.

If dimensions other than those listed in this International Standard are required, they should be selected from those given in GB/T 5286.


2 Normative References

The following normative documents contain provisions which, through reference in this text, constitute provisions of this standard. At the time of publication, the editions indicated
were valid. All normative documents are subject to revision, and parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents listed below.

GB/T 90.1-2002 Fasteners — Acceptance Inspection (idt 3269:2000)
GB/T 90.2-2002 Fasteners — Marking and Packaging
GB/T 1237-2000 Designation System for Fasteners (eqv ISO 8991:1986)
GB/T 3103.3-2000 Tolerance for Fasteners — Plain Washers (idt ISO 4759-3:2000)
GB/T 4340.1-1999 Metallic Materials — Vickers Hardness Test — Part 1: Test Method (eqv ISO 6507-1:1997)
GB/T 5267.1 Fasteners — Electroplated Coatings (ISO 4042:1999, IDT)
GB/T 5267.2 Fasteners — Non-electrolytically Applied Zinc Flake Coatings (ISO 10683:2000, IDT)
GB/T 5286 Plain Washers for Bolts, Screws and Nuts — General Plan (idt ISO 887:2000)

3 Dimensions

Foreword II
1 Scope
2 Normative References
3 Dimensions
4 Specifications and Standards of Reference
5 Designation