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 Home > Products > Twins-Lock ® Washers > DIN 25021    

Twins-Lock® Washers


Specification Requirements:

● Dimensions:See dimensions above.

● Material:Carbon Steel.

● Mechanical Properties:Hardness HRC 44 - 51.

● Finish:– Zinc Yellow.

               – Zinc Flake with Delta Protekt®.

Product working principle:

To ensure the integrity of fastener thread systems, we works by using tension rather than friction, which has been the basis for most traditional fastening methods. This ensures the securing of threaded systems. This part consists of two identical flat washers which have a set of cams on one side and a radial knurling on the other side.


The angle of inclination a of the washer cam is bigger than the pitch ß of the screw thread. When the fastener is tightened, the knurled surfaces grip both the bearing surface of the fastener and the material into which the screw is being fastened. The larger angle of the cam a, compared to the smaller angle of the screw thread ß, will not allow the screw to loosen because of the tension caused by the cam lifting.