Metric Washer
This metric washer size chart is based on globally applicable ISO standards and compiled manufacturer datasheets. Each size include one reference diagram and a complete dimensions chart covering inner diameter, outer diameter, and thickness. and a built-in metric-to-inches converter for user from the United States.
How Metric Washer Sizes Work
Metric washers are designated by the bolt size they are intended to fit. For example, an M8 washer is designed to be used with M8 bolts and fasteners, ensuring proper load distribution and fit.
Washer Types
Common metric washer types include plain (flat) washers, spring washers, and structural washers. Each type serves a different mechanical purpose, such as load spreading, vibration resistance, or surface protection.
ISO Standards
All washer sizes listed follow ISO metric fastener standards, which define inner diameter, outer diameter, thickness, and tolerance ranges to ensure compatibility across manufacturers.