Woodruff keys
Reliable solutions for your applications – disc springs according to DIN 6888
The disc spring is a solid, semicircular metal part that is pressed into a specially milled groove in a shaft, which is usually conical in shape. The disc spring ensures that the shaft and the component it drives are firmly connected to each other. It transmits the torque from the shaft to the component or vice versa.
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| Product | Materials | Width (in mm) | Height (in mm) | Length (in mm) | Thread | Version |
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Steel (1.0503) | 1 | 1,4 | 4 | ||
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Steel (1.0503) | 1,5 | 2,6 | 7 | ||
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Steel (1.0503) | 2 | 3,7 | 7 | ||
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Steel (1.0503) | 2 | 3,7 | 10 | ||
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Steel (1.0503) | 2,5 | 3,7 | 10 | ||
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Steel (1.0503) | 3 | 3,7 | 10 | ||
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Steel (1.0503) | 3 | 5 | 13 | ||
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Steel (1.0503) | 3 | 6,5 | 16 | ||
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Steel (1.0503) | 4 | 5 | 13 | ||
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Steel (1.0503) | 4 | 6,5 | 16 | ||
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FAQs about Woodruff keys
Woodruff keys are mainly used in tapered connections. An example of this is steering wheels on steering columns: here, a tapered seat is used for centering, and the woodruff key prevents twisting.
A woodruff key is a semicircular connecting element that is inserted into a semicircular groove in a tapered shaft and enables a positive connection between the shaft and hub for torque transmission.
Woodruff keys are mainly used in tapered connections. One example is steering wheels on steering columns: here, a tapered seat is used for centering, and the disc spring prevents twisting.
Woodruff keys are manufactured in accordance with DIN 6888, which defines the dimensions and tolerances for woodruff keys.
They are mainly made of C45 steel, but stainless steel or other corrosion-resistant materials can also be used for special requirements. Heat/surface treatment is also possible.
Woodruff keys are the preferred choice for torque transmission on tapered shafts. They can partially compensate for axial movements and have a better form fit.
The notch effect on the shaft is weakened by the introduction of the groove for the woodruff key. It has a limited transmissible torque and is less suitable for load changes.
The size of the woodruff key is based on the shaft diameter and the torque it has to transmit. The width, height, and length are calculated accordingly.
The semicircular side is inserted into the semicircular groove of the shaft. The hub must have a corresponding groove into which the protruding woodruff key fits exactly.
The woodruff key must be knocked out or pressed out using an auxiliary hole.
Typical areas of application for woodruff keys include mechanical engineering, drive technology, machine tools, automotive engineering, and agricultural engineering—anywhere where compact torque connections are required.
Permissible deviations (e.g., ISO tolerance classes) usually apply to the groove width in accordance with DIN/ISO guidelines.
Fits with P8 or N9 (depending on the seat) are recommended, for example. For woodruff keys, h9 mainly applies.
Depending on the requirements of the connections (higher torque, interactions, etc.), other tolerances for woodruff keys and grooves can also be specified and manufactured.
The functions of a woodruff key are positive locking and torque transmission.
Firstly, we are a series manufacturer and produce from stocked, close-tolerance raw materials.
This means an excellent end product that fully meets the standard-specific requirements, and the stock levels ensure high availability.
A specific nosta manufacturing process also ensures absolutely perfect installability, thus saving time and money during installation.