These M20 × 37 mm Form A flat washers conform to DIN 125 and are fabricated from A2 grade stainless steel. The 3.3 mm thickness and natural finish provide reliable load‑bearing and corrosion resistance in demanding applications. Internal diameter of 21 mm ensures compatibility with standard M20 threads. 
 
External Diameter (OD)
37 mm
Thickness (T)
3.3 mm (tolerance +0/-0.6 mm)
Material
Stainless Steel (A2)
Finish
Natural
Internal Diameter (ID)
21 mm (tolerance +0.33/-0 mm)
Manufacturing Standard
DIN 125