DIN 9021 vs ISO 7093-1

Plain Washer

Interchangeable

Not exactly. The hole is 1 mm smaller at M18, M20 and M24 in ISO 7093-1; the washer is 0.2 mm thinner at M5 in ISO 7093-1. Order to the number on your drawing.

Which to order

ISO 7093-1 for new drawings. It replaced DIN 9021, and if your drawing says DIN 9021, we make DIN 9021.

Sizes

M3 to M36 in both. DIN 9021 also has M2.5 and M7. ISO 7093-1 also has M22, M27 and M33.