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What are ISO 7090 A4 Stainless Steel HV 200 Flat Washers?
ISO 7090 washers are metric flat washers with a chamfered outer edge, designed to distribute fastening loads over a larger bearing surface beneath a bolt head or nut. Manufactured to the HV 200 hardness class, they provide increased resistance to indentation and deformation for demanding fastening applications.
What is the difference between ISO 7089 and ISO 7090 Washers?
The primary difference is the outer edge design. ISO 7089 has a plain outer edge, while ISO 7090 has a chamfered outer edge on one side. Both are available in stainless steel at 200 HV hardness, with ISO 7090 providing the chamfered profile for applications where that configuration is preferred or specified.
What does HV 200 mean for ISO 7090 Washers?
The HV 200 designation refers to the washer's Vickers hardness, indicating a minimum hardness of 200 HV. This higher hardness helps the washer resist indentation and deformation under the compressive forces generated when a fastener is tightened. It provides a more durable bearing surface than softer stainless steel washers and is particularly useful with higher-strength fasteners.
What material are ISO 7090 A4 Stainless Steel HV 200 Washers made from?
These washers are manufactured from A4 stainless steel, also known as 316 or marine-grade stainless steel, and meet the 200 HV hardness class. A4 stainless provides superior corrosion resistance compared with A2 stainless, particularly in environments exposed to saltwater, chlorides, coastal conditions, and persistent moisture.
Where are ISO 7090 A4 Stainless Steel HV 200 Washers commonly used?
ISO 7090 A4 stainless HV 200 washers are commonly used in marine equipment, boats and yachts, coastal structures, automotive and motorsport equipment, outdoor machinery, food processing equipment, industrial machinery, pumps, electrical equipment, and architectural hardware. They are especially well suited to demanding applications requiring marine-grade corrosion resistance, high 200 HV hardness, and a chamfered washer profile.
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