1. Grade C washers have no requirements regarding surface roughness (Ra 3.2) or deburring.
2. Grade C is suitable for medium-precision assembly series; Grade A is suitable for high-precision assembly series.
3. GB 848-85 is primarily used with cheese-head screws; other standards apply to standard hex bolts, screws, and nuts.
4. Material mechanical property classes: Steel 200HV; Austenitic stainless steel A200.
5. Designation example: Standard series, nominal size d = 8 mm, property class 200HV, plain washer without surface treatment: Washer GB 97.1-85 8 200HV.