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56WUSSTH , Extra Thick USS Heavy Duty Thru-Hard Washers

Diameters to ASME B18.22.1 specifications & a hardness of HRC 38-45
Hardness: Rockwell C38 - 45
Steel mechanically zinc yellow plated & baked after plating

Free manufacture's certification available
Products specifications
Size 9/16 in
Weight Lbs/M 52.60
Plating Steel Mechanically Zinc
Hardness Rockwell C38-45