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Nord-Lock - screw lock without compromise. The original Nord-Lock wedge lock washers are known worldwide for screw connections that are exposed to strong vibrations and dynamic loads. With their unique wedge lock technology and made of high-quality material, the Nord-Lock wedge lock washers are the safest and most reliable screw locking elements in the world. The original Nord-Lock wedge lock washers are a purely mechanical fastening element according to DIN 25 201, which secures screw connections by clamping force rather than friction. The functional principle: Nord-Lock screw locking systems consist of a pair of wedge locking discs with opposite wedge surfaces that interlock each other. There is a wedge effect, which prevents the screw from loosening. The shape of the wedge surfaces is selected so that the angle "a" is always larger than the thread pitch "ß". When tightening the screw connection, the radial ribs form fitting into the counter support. The Nord-Lock wedge safety disc pair sits firmly in place and movements are only possible between the internal wedge surfaces. Even at the lowest rotation in the release direction, an increase of the pre-load force is achieved due to the wedging effect - the screw thus secures itself. When loosening the screw connection, the internal wedge surfaces create a so-called click effect. Under these conditions - form fitting and click effect - Nord-Lock secures every screw connection, even under strong vibration and dynamic load. The advantages: original Nord-Lock wedge lock washers secure screw connections that are exposed to strong vibrations and dynamic loads; large selection of different dimensions and materials for use in general steel and stainless steel applications; large selection of different dimensions and materials in corrosive and acidic environments and at high ambient temperatures; the safety function is not affected by lubrication; achieves an accurate preload with defined and even friction Designed for screws. Up to and including strength class 12.9 (steel) and A4-80 (stainless steel); high corrosion resistance (at least 1,000 hours in salt spray test according to ISO 9227) for steel wedge lock washers; reusable (depending on application conditions); the use of Nord-Lock wedge lock washers with enlarged outer diameter (sp) in combination with flange nuts or screws we recommend For slotted holes, varnish surfaces and soft materials such as aluminium.

• Original Nord-Lock wedge locking discs secure screw connections that are exposed to strong vibrations and dynamic loads
• With enlarged outer diameter (sp)
• A4 stainless steel
• Reusable (depending on conditions of use)