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What are ISO 7089 A2 Stainless Steel 200-HV Washers?
ISO 7089 A2 Stainless Steel 200-HV Washers are designed to distribute the load of a bolt or nut over a larger bearing surface. ISO 7089 is the international standard that replaced the traditional DIN 125A specification, with the same familiar general-purpose flat washer design but updated dimensional and mechanical requirements. These washers are manufactured to the 200 HV hardness class, making them a higher-hardness stainless steel washer intended for demanding bolted assemblies.
What does 200 HV mean, and why is it important?
The 200 HV designation refers to the washer's Vickers hardness class, indicating a minimum hardness of 200 HV. Harder washers are more resistant to indentation and deformation when compressed beneath a bolt head or nut, helping maintain a stable bearing surface in a properly designed bolted joint. This is particularly important when using stronger fasteners where a softer washer could deform under high clamping loads.
The 200 HV specification is also an important distinction between ISO 7089 and traditional DIN 125A washers. DIN 125A commonly refers to the older German standard and is still widely used as a purchasing and search term. ISO 7089 replaced DIN 125A and does not include the 140 HV stainless steel hardness class. For ISO 7089 stainless steel washers, 200 HV is the specified hardness class, making these substantially more specialized than the common softer 140 HV stainless washers still sold under legacy DIN 125A terminology.
What material are ISO 7089 A2 200 HV Washers made from?
These washers are manufactured from A2 stainless steel and hardened to the 200 HV class. A2 stainless steel provides excellent general corrosion resistance against moisture, humidity, and oxidation, while the 200 HV hardness provides improved resistance to compression and surface deformation compared with softer stainless steel washers.
Where are ISO 7089 A2 Stainless Steel 200 HV Washers commonly used?
ISO 7089 A2 200 HV washers are commonly used in industrial machinery, automotive equipment, automation, electrical equipment, manufacturing equipment, outdoor machinery, appliances, instrumentation, and general mechanical assemblies.
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