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What are ISO 7093 A4 Stainless Steel HV 200 Large Outer Diameter Washers?
ISO 7093 washers are metric flat washers with a large outside diameter, providing substantially greater bearing coverage than a standard flat washer. Their oversized profile helps distribute clamping loads over a larger area, making them ideal for thin, soft, flexible, or easily damaged materials and for oversized or slotted holes. These washers are manufactured to the HV 200 hardness class, providing a harder and more deformation-resistant bearing surface.
What does HV 200 mean for ISO 7093 Washers?
HV 200 refers to the washer's Vickers hardness class, indicating a minimum hardness of 200 HV. This higher hardness helps resist indentation and deformation when the washer is compressed beneath a bolt head or nut. It is particularly valuable in demanding assemblies where maintaining a stable bearing surface under higher clamping loads is important.
The HV 200 specification also distinguishes these ISO 7093 washers from the softer oversized washers commonly associated with the older DIN 9021 designation. ISO 7093 establishes the newer international specification and defined mechanical requirements, giving these washers the combination of large outside diameter and higher 200 HV hardness for applications where both load distribution and resistance to deformation matter.
What material are ISO 7093 A4 Stainless Steel HV 200 Washers made from?
These ISO 7093 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.
The combination of A4/316 stainless steel, HV 200 hardness, and an oversized outside diameter makes these a premium specialty washer for demanding fastening applications requiring both corrosion resistance and increased resistance to deformation.
Where are ISO 7093 A4 Stainless Steel HV 200 Washers commonly used?
ISO 7093 A4 stainless HV 200 oversized washers are commonly used in marine equipment, boats and yachts, docks, coastal structures, automotive and motorsport equipment, outdoor machinery, agricultural equipment, construction, electrical enclosures, and industrial fabrication.
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