load indicating washers for the use in high strength structural bolting for preloading are under preparation Marking Bolts shall be marked accordance with ISO 898-1 and shall additionally bear the symbol 'HV' . Important Note : Preloaded bolted assemblies are very sensitive to differences in manufacture and lubrication.

Please see the Inside Diameter spec in the table above, if available. Washers are thin disk-shaped plates with a hole that is used to distribute the load of a 

The HV bolt assembly is used in both preloaded and non-preloaded applications and it can be argued that in the event of failure by thread plastic deformation the assembly still acts as a non-preloaded assembly. These assemblies are more sensitive to over-tightening during preloading and therefore require more site control.

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This International Standard specifies the characteristics of normal-series, product-grade-A plain washers in the 200 HV and 300 HV hardness classes and of 

Washers of hardness class 200 HV are suitable for hexagon bolts and screws of product grades A and B in property classes up to and including 8.8; hexagon nuts 

This International Standard specifies the characteristics of normal-series, product-grade-C plain washers in the 100 HV hardness class and of nominal sizes (nominal thread diameters) ranging from 1,6 mm to 64 mm inclusive. Washers of hardness class 100 HV are suitable for hexagon bolts and screws of product grade C in property classes up to and

We use high MS, SS, carbon steel material and high alloy steel raw materials to achieve the required properties in this standard. There are five popular grades are, MS, HV 100 , HV 200, HV 300 & A4 which denote material hardness strength and their respective mechanical properties for HV 200 Washer. Grades, Grade HV 200 Chemical properties,

Metric Flat washers. These are made to DIN 125A / ISO 7089 specifications from class 200 HV steel.Class 10.9 / Grade 8 with a 200 HV (hardness) rating. Washer Size (Diameter) is the size of the screw that the washers is for (example: M8 washer for a M8 screw).

Washers with a Hardness Class of 140 HV should only be used with bolts/screws below Class 8.8 and nuts below Class 8; 200 HV washers are suitable for Class 8.8/Class 8 and below; and use 300 HV washers for Class 10.9 bolts/screws and Class 10 nuts and below—they are not suitable for use with Class 12.9/Class 12 fasteners.

This International Standard specifies the characteristics of normal-series, product-grade-A plain washers in the 200 HV and 300 HV hardness classes and of nominal sizes (nominal thread diameters) ranging from 1,6 mm to 64 mm inclusive. Washers of hardness class 200 HV are suitable for. ? hexagon bolts and screws of product grades A and ? in