F62 series NAAMS hardened washers are heat treated to Rc 38-45 for sizes M6 to M10, while M12 and larger conform to ASTM F436M dimensional and material standards. Washer inner diameters range from 7.0 mm to 39.0 mm, outer diameters from 12.6 mm to 70.1 mm, and thicknesses from 2.7 mm to 3.4 mm.
