This standard specifies the characteristics of normal-series, product-grade-C plain washers in the 100 HV hardness class and of normal sizes (normal thread diameters) ranging from 1.6 to 64mm inclusive.
Washers of hardness class 100HV are suitable for:
-Hexagon bolts and screws of product grade C in property classes up to and including 6.8;
-Hexagonal nuts of product grade C in property classes up to and including 6;
-Case-hardened thread rolling screws.
If dimensions other than those listed in this standard are required, they should be selected from those given in ISO 887.
When soft material pieces are clamped, or large clearance holes in the workpiece are used, the user should check the technical suitability of this type of washer.
2 Normative References
The following standards contain provisions which, through reference in this text, constitute provisions of this standard. At time of publication, the editions indicated are valid As all the standards will be revised, each party using this standard shall discuss the feasibility of using the latest edition of the following standards.
GB/T 90.1-2002 Fasteners-Acceptance Inspection (idt ISO 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 5267.1-2002 Fasteners-Electroplated Coatings (ISO 4042:1999, IDT)
GB/T 5267.2-2002 Fasteners-Non-Electrolytically Applied Zinc Flake Coatings (ISO 10683:2000, IDT)
GB/T 5286-2001 Plain Washers for Metric Bolts, Screws and Nuts for General Purposes-General Plan (idt ISO 887:2000)
