Wedge lock systems
The wedge lock system belongs to the high-end products in the area of mechanical securing elements. It comes under anti-rotation lock and can be found in various designs.
The screw and the part to be joined remain firmly connected. The screw connection remains stable, the preload force is almost retained and the fastener stays in its initial position. It is recommended to add an additional safety element, especially with critical screw connections, which are to withstand extreme vibrations, changing forces or dynamic loads.
How do lock washers work?
The following four factors ensure the locking function of the washers: Hardness difference, difference in the angle, friction difference and preload difference. .
Since the surface of the wedge lock washer or ring lock washer is harder than that of commercially available screws, the radial ribs on the outer sides of the washer are shaped into the counter material (hardness difference). When tightening the screw connection, it creates a positive connection. Due to the specific pitch angle of the wedge surfaces on the disc, it comes to a self-locking if the screw should loosen automatically (angle difference).
The wedge sections at the joint faces of the two disc halves have a significantly lower coefficient of friction than the toothed outside of the discs. As a result, an unscrewing movement always leads to movement between the two disc halves and not between disc and counter-material (friction difference). If the wedge lock washer expands by a loose rotation, this leads to elongation of the screw and thus to an increase in pretensioning (preload difference).
Released factory standards:
- Siemens AG: KUN607.07
- Enercon GmbH: MK 06 007-1
- Alstom Transport AS: DTRF15021 - Appendix 5
- Deutsche Bahn AG/DB Systemtechnik GmbH: general approval
- Knorr-Bremse
- Hübner
Institutes:
- German Institute for Building Technology: general building authority approval (abZ) No. Z-14.4-702
- TÜV Rheinland: RoHS approval in accordance with Directive 2002/95/EC
- TÜV Süd: Approval of the HEICO-LOCK® wheel lock nut
- DNV GL: Whitness tests of the HEICO-LOCK® wedge lock washer
- DIBt: ETA-20/0075 for HEICO-LOCK® wedge lock washer narrow & wide shape in steel zinc flake
Our in-house product series W.TEC® represents our carefully curated selection of products that stand out due to their excellent functionality and top class quality. Each product has been developed with the highest quality standards in order to meet the requirements of the industrial customers. This combination of precision and performance makes the products of our W.TEC® series price and performance champions.
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