Bell. Wash. .340 I.D. x .872 O.D.
This is a Belleville washer, and it is used with various lawn and garden equipment around your home. This part has an inner diameter of 0.340 inches and an outer diameter of 0.872 inches. The convex shape of the Belleville washer acts like a spring, which is why they are often used in high load bearing situations.
Manufacturer Part Number: 736-0242