Flat Gasket Washer Zinc-Plated Plain Carbon Steel JIS/ASTM WPB A312 DIN 200 Washers
Washer is a hole in a thin (usually round) plate (usually in the middle) that is usually used to distribute load thread fasteners.Other uses are as spacers, springs (Belleville gaskets, wave gaskets), wear pads, pre-display devices, and locking devices.Rubber gaskets are also used in faucets (valves) to cut off the flow of liquid or gas.Rubber or silicon gaskets can also be used to reduce fan vibration.Usually the outer diameter of the gasket is about twice the inner diameter.
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