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This International Standard specifies the characteristics of flat washers -- in alloy steel and cadmium plated, classification 900 MPa1) /235 oC 2) ; or -- in corrosion-resistant steel and passivated, classification 900 MPa1) /450 oC 2) . 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. 1) Minimum tensile strength of the material at ambient temperature. 2) Maximum temperature, determined by the surface treatment, that the bolt can withstand without continuous change in its original characteristics after return to ambient temperature.