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What are ISO 7089 A4 Stainless Steel 200 HV Washers?
ISO 7089 A4 Stainless Steel 200 HV Washers designed to distribute fastening loads over a larger bearing surface. They follow the international ISO 7089 specification, which replaced the traditional DIN 125A standard, while providing the higher hardness associated with the ISO 7089 stainless steel specification. The 200 HV classification makes these a specialty high-hardness stainless steel washer for demanding fastening applications.
What does 200 HV mean, and why is it important?
200 HV is the Vickers hardness class of the washer, indicating a minimum hardness of 200 HV. This increased hardness helps the washer resist indentation and deformation when subjected to the compressive forces generated by tightening a bolt or nut. A harder washer can provide a more stable bearing surface, particularly in applications where maintaining clamping force and minimizing washer deformation are important.
The 200 HV specification is especially significant when comparing ISO 7089 with traditional DIN 125A. DIN 125A is the familiar legacy designation for a standard metric flat washer and is still commonly used by buyers and distributors. However, ISO 7089 replaced the DIN 125A specification and eliminated the 140 HV hardness class from the ISO standard. Stainless steel ISO 7089 washers are specified at 200 HV, making them a notably harder and more specialized option than the common 140 HV stainless washers associated with the older DIN designation.
What material are ISO 7089 A4 200 HV Washers made from?
These washers are manufactured from A4 stainless steel, also known as 316 or marine-grade stainless steel, with a 200 HV hardness classification. A4 stainless steel offers superior corrosion resistance to A2 stainless steel, particularly in environments exposed to saltwater, chlorides, coastal conditions, and other corrosive elements.
Combining A4/316 stainless steel with 200 HV hardness provides both excellent corrosion resistance and a harder bearing surface, making these washers particularly valuable for demanding marine, outdoor, and industrial fastening applications.
Where are ISO 7089 A4 Stainless Steel 200 HV Washers commonly used?
ISO 7089 A4 200 HV washers are commonly used in marine equipment, boats and yachts, coastal structures, automotive and motorsport equipment, outdoor machinery, food processing equipment, chemical-processing equipment, pumps, industrial machinery, and architectural hardware. They are especially well suited for metric stainless steel fastening assemblies exposed to moisture, saltwater, and corrosive environments.
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