Double locking device „DSL“

　　The „DSL“- double locking deviceis a locking element 

　　that, due to a design-related from of elasticity with 

　　respect to its height dimension, prevents the loosening 

　　of screw connections resulting from a yielding deformation of the screws or workpiece. Simultaneously, a 

　　high degree of sealed-tightness of the connection is 

　　also achieved.

　　The basis for the development of this product was the 

　　integration of the advantages of two materials and two 

　　strengths.

　　The function of the steel locking element enclosed by 

　　the tough, hard polyamide is to provide a steel-to-steel 

　　connection between the nut or bolt head and workpiece that is able to absorb the enormously high pretensioning forces when the parts are being screwed 

　　together.

　　Due to the bending, distorting and penetrating of the 

　　tooth-shaped projections into the surface of the involved surface areas, the friction is increased and results 

　　in a form-fit connection.

　　The plastic material enclosing the steel locking element adapts itself to these deformations flowingly and 

　　protects the locking element against corrosion for a 

　　long time.

　　The second locking element of this DSL-double locking

　　device is the enclosing plastic washer made of polyamide.

　　The effect of this design shape is based on the fact 

　　that the friction between the comparably hard surface 

　　of the nut or bolt head as well as of the workpiece and 

　　of the slightly deformable plastic piece is increased 

　　accordingly, and on the fact that the plastic material 

　　adapts itself to the unevenness of the supporting

　　surface of the nuts or bolt head and workpiece and on 

　　the fact that the plastic material is pressed outward 

　　and downward due to its initial shape in order to place 

　　itself there around the external surface of the nuts or 

　　bolt heads of hexagon head screws and hexagon socket screws and then penetrates into the threads.

　　Here an additional higher degree of friction locking is

　　produced which results in the double effect of this 

　　elastic, highly loadable locking device.

　　made of polyamide 6 + spring steel