Washer DIN 9021 M5(5,3) 200HV zinc-nickel silver

An enlarged washer is a fastener that looks like a flat disc with a smooth cylindrical hole in the middle, the diameter of which is larger than the diameter of the metric product with which it is used. Materials from which they are made: steel 140, 200.

Area of use DIN 9021 is effectively used when connecting materials with a soft structure, such as wood, plastic, etc. It is also commonly known as a “rivet washer,” which indicates its appropriate use. It is also often used with DIN 571 self-tapping screws and DIN 975 threaded studs when installing wooden structures. A characteristic feature of this washer is that its outer diameter is equal to 3 times its inner diameter, which helps to take these parameters into account during calculations and installation.

The material of manufacture is high-strength structural steel.

Coating: Zinc-nickel silver. Zinc-nickel coating is an innovative anti-corrosion solution for fasteners, combining high protective properties, mechanical strength, and environmental safety.

The key advantages of zinc-nickel coating are:

• Excellent corrosion resistance - more than three times higher than that of conventional zinc;
• Low risk of hydrogen embrittlement;
• Compatibility with aluminum - does not form galvanic couples and does not cause corrosion in combination with aluminum parts;
• Increased heat resistance - retains its protective properties during temperature changes and during prolonged operation in high-temperature conditions;
• Mechanical strength - harder than pure zinc, has better resistance to scratches and wear;
• Environmental friendliness - less oxidation products are formed, resulting in lower zinc emissions into the environment throughout the product's life cycle.

Analogs: GOST 6958-78, ISO 7093-1. ISO 7093-2.