Carbon Steel A105 JIS/ASTM White Zinc-Plated DIN 80 Plain Washers Factory Directly Flat Gasket Washer
Winding gasket refers to use metal belt (usually v steel belt) and nonmetallic belt winding into the ring gasket, metal and nonmetal belt winding alternately, since it has good flexibility, widely used in petrochemical, chemical, electric power industries of flange sealing structure, according to the site, can be in gasket inner or outer layer and steel rings to locate or strengthened.
Marking of Small Series (or Standard Series), Nominal Size D =8mm, Performance Class 140HV (or Flat Washer, or chamfered Flat Washer), without surface treatment: Washer GB848-85-8-140HV (or GB97.1 -- 85-8-140HV