Form A Washers DIN 125A

Form A flat washers are the quintessential standard-pattern washer used across everyday engineering, automotive, and construction assemblies. Manufactured to the widely recognized DIN 125A specification, these plain washers feature a standard outer diameter and nominal thickness relative to their inner diameter size. Their primary purpose is to spread the clamping force of a tightened bolt or nut evenly over a flat surface, preventing localized surface damage, gouging, or galling on softer base metals, timber, and plastics. They also cover slightly oversized clearance holes to create a flat, rigid bearing face for accurate torqueing.

Choosing the right material grade depends heavily on your operating environment. For dry, indoor applications, our Bright Zinc Plated (BZP) Form A Washers provide essential corrosion resistance against light atmospheric moisture while keeping material costs low. For outdoor installations, marine environments, or chemical exposure, upgrading to our A2 Stainless Steel Form A Washers or A4 Marine Grade Washers prevents rust and joint degradation over time. If your application involves weak timber, thin sheet metal, or oversized slot holes requiring a wider surface area to spread high clamping loads, consider pairing your fixings with our Form C Washers Collection for a larger outer diameter.