The DIN norm has been created for metallic products, the dimensions of plastic products are close to the norm.
The washers ˜ DIN 440 protect surfaces and offer good electrical insulation.
They resist corrosion and most diluted acids and absorb shocks and vibrations.
Tol. +/- 0.3 for d and D.
Tol. +/- 0.2 mm for h.