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M12, 12mm Metric Belleville Ribbed "Rip-Lock" Series Medium Washer Belleville washers have a concave shape to maintain compressed tension For Bolt / Screw Sizes: 12mm, M12 Inner Diameter: 12.4mm Outer Diameter: 27mm Height: 3.1mm Material Thickness: 1.8mm Material: Spring Steel Finish: Zinc Flake coated GEOMET 500 As Geomet is the environmentally friendly, VOC compliant replacement for Dacromet Coating./li> Geomet is a water based, zinc flake, chrome free coating that is anticorrosive and suitable for high temperatures, greater than 572F. Geomet is paintable and does not cause hydrogen embrittlement, which makes it suitable for high tensile fasteners. Salt Spray Resistance > 720 hours. Also known as serrated conical, coned-disc, cupped spring lock washer 25 Pieces Per Package