DIN 6904 Screw with Captive Spring Washers

The German standard DIN 6904 covers the production of steel screws fitted with captive spring washers. The washers increase the contact area of the screw head on the material; their use enhances joint strength and prevents cracking on thin-sheet materials. The screw is suitable for use together with nuts and washers, and can be used with other types of fasteners. It is widely used in various branches of mechanical engineering and in the assembly of various metal structures.

Production and key characteristics

The DIN 6904 screw is made of high-strength carbon steel, which is resistant to mechanical loads. To increase corrosion resistance, a thin layer of zinc is applied to the product by electroplating. Fasteners made of stainless steel grades A2 and A4 are also available — such products are not subject to corrosion and can be used in chemically active environments.

The fastener product has the following characteristics:

• Partial metric thread with a wide range of diameters.
• Hexagon head shape for convenient tightening and loosening of the screw.
• Products with similar properties are manufactured to standards DIN 6905 and DIN 6906.

Terms of sale at FLOK

FLOK sells fastener products in wholesale quantities, supplying both small and large wholesale lots. FLOK cooperates with manufacturers in Russia and Europe.