DIN 6901 Self-Tapping Screw with Captive Flat Washer

Self-tapping screws manufactured to the German standard DIN 6901 are designed for joining parts made of metal, plastic, and other materials. They are installed into holes of the corresponding diameter and simultaneously cut their own thread. The product may have a hexagon head or a round head with a recess for driving. To reduce pressure on the material surface, the fastener is fitted with a captive flat washer: it increases the contact area and prevents cracks and dents from forming. The fastener is suitable for joining thin-sheet parts.

Material and application

Self-tapping screws are made of steel with an electroplated zinc coating, which prevents corrosion. They can also be made of acid-resistant stainless steel grades A2 and A4. Such fasteners can be used for a long time in highly corrosive environments without losing strength.

DIN 6981 screws are used in mechanical engineering; they are used in the assembly of instruments, vehicles, and industrial equipment. Their enhanced corrosion resistance allows them to be used in joints exposed to aggressive environmental effects.

Variants	As per DIN	Examples
Flat washers	DIN 6903
Flat washers	DIN 6903