DIN 125 Flat Washer Form A

Flat washer to DIN 125 standard, form A — without chamfer. This is a widely used fastener: it is used with bolts, screws, nuts, studs and other fastening elements. Its main purpose is to increase the contact area between the metal part and a weaker thin-sheet material.

The expanded bearing area reduces pressure on the surface, lowering the risk of damage and cracking.

Design features

Various materials are used to manufacture flat washers. The most common option is hardened high-strength steel. To improve corrosion resistance, a zinc coating is applied using hot-dip, thermal spray or electroplating methods. Nickel plating is also used for protection.

For highly corrosive conditions, washers are made from stainless steel grades A2 and A4 — these are resistant to corrosion and chemically aggressive environments. Non-ferrous metals and alloys are also used for production: aluminium, copper, brass.

Flat washers to DIN 125 standard have the following characteristics:

• Used with fasteners with nominal thread diameter from M1 to M90.
• Inner diameter of the washer — from 1.1 to 93 mm.
• Washer thickness — from 0.3 to 12 mm.

Products of similar form are manufactured to the Russian standard GOST 11371-78. Washers of the same type with product grade A are also produced to the international standard ISO 7089.

Applications

Flat washers of form A are widely used in mechanical engineering: automotive manufacturing, assembly of mechanisms and units, machine-tool building and other industries. They increase the reliability of threaded connections, prevent material damage, and make the fastening more reliable.

Washers of this type suit various fasteners — a wide range of options allows selecting a solution for any parts connection. Due to their high reliability, they can be used with fasteners of property class 10.9 and 12.9.

In a threaded connection of parts with a nut, two washers can be used: one under the bolt head, the second — under the nut, providing protection of the material from damage on both sides. If the screw is driven directly into the material, one flat washer is used. Due to the quality of the material, it does not deform under constant mechanical stress.

Terms of purchase at FLOK

FLOK supplies fasteners wholesale in a wide range of sizes. Products from Russian and foreign manufacturers are in stock.