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Fasteners Nut Bolt Weight Calculator, Check bolt weight calculator in mm, bolt weight calculator in kg, hex bolt weight calculator, foundation bolt weight. Heavy Hex Nut dimensions per ASME B18.2.2 1987 (1999). Heavy Hex Nut Width Across Flats. The width across flats of nut shall be the distance measured, perpendicular to the axis of nut, overall be tween two opposite sides of the nut in accordance with the notes on respective dimensional tables.