ASME B18.21.1 pdf download LOCKVWASHERS (INCH SERIES) 2.7 Processing 2.7.1 Finishes. Unless otherwise specified by thepurchaser, lock washers shall be supplied with a plain(as processed) finish, not plated or coated. Wherecorrosion preventative treatment is required,washersshall be plated or coated as specified by the purchaser.When helical spring-lock washers are to be furnishedwith coatings over 0.0005 in. thick and are to be...