1. Grade C washers are not subject to requirements regarding a surface roughness of Ra 3.2 or deburring.
2. Grade C is suitable for medium-tolerance assemblies, whereas Grade A is suitable for precision assemblies.
3. GB 848-85 is primarily intended for use with cylindrical head screws; other standards apply to standard hexagon bolts, screws, and nuts.
4. Material Mechanical Property Grades: Steel - 200HV; Austenitic Stainless Steel - A200.
5. Marking Example: A flat washer of the standard series, with a nominal size d = 8 mm, a property grade of 200HV, and no surface treatment: Washer GB97.1-85 8 200HV