Product Details Size Ranging from 406.4mm to 660.4mm in diameter and 3mm to 8mm in thickness Material High Carbon Steel is primarily used to manufacture agricultural disc blades Cross Rolling Disc blades made out of cross-rolled sheets Concavity The depth measured at the lowest point at the centre of the disc Hardness Testing This test measures whether the hardness achieved is within the prescribed range or not. The hardness range should be 38 to 45 HRC Wobble Test The axial deviation of points on the disc edge in a plain parallel to the axis of the disc when the disc is rotated about its centre Eccentricity The radial deviation of points on the disc edge in a plane perpendicular to the axis of the disc when the disc is rotated about its centre Specifications Disc Size 610mm Concavity 82.5mm Bevel Length 22mm