Historical
ASME B18.21.1-2009
Washers: Helical Spring-Lock, Tooth Lock, and Plain Washers (Inch Series)
This standard covers the dimensional requirements, physical properties, and related test methods for helical spring-lock washers (#0 through 3 inches), tooth-lock washers (#2 through 1 ¼ inches), and plain washers (#0 through 3 inches).
American Society of Mechanical Engineers [asme]