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

Twins-Lock® Washers, Stainless Steel


Specification Requirements:

● Dimensions:See dimensions above.

● Material:316 Stainless steel

● Mechanical Properties:Hardness HRC 35 min.

● Finish:Plain.

Product working principle:

To ensure the integrity of fastener thread systems, we work 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 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.