This International Standard specifies the characteristics of flat washers — in alloy steel and cadmium plated, classification 900 МРа/235 °C; or — in corrosion-resistant steel and passivated, classification 900 МРа/450 °C. This International Standard is applicable to washers used with ISO 9219 bolts, diameter codes 050 and 060, ISO 9216 nuts and ISO 1234 split pins in the assembly of ISO 7939 pulleys. It is also applicable to washers used in the assembly of airframe rolling bearings or spherical bearings.