As a result of the increasing importance of magnesium as a material used in design engineering the material composition of screw fastenings has to be considered carefully. Alufast© aluminium screws from Arnold Umformtechnik have proved to be particularly suited for making screw fastenings on housing sections, brackets and stiffeners made of magnesium.
An investigation carried out by fastener specialists Arnold Umformtechnik GmbH found that in a gearbox containing 20 screws Alufast weighed approximately 350 grams less that the steel version of the screw. In terms of annual production of, for example, 100,000 gear boxes that would translate to a saving of some 35 tons.
At the same time the Alufast range scores even more points when used in corrosive atmospheres where fastener locations are subjected to particularly high temperature loads. Alufast screws have proven to be of particular value under thermal loads. The mechanical properties of the screws remain stable over a long-term period of load, up to a peak temperature of 150 degrees Celsius.
Designers can use standard head settings when fastening magnesium components, unlike steel screws, which would require larger head settings. The screws achieve process reliability, high strength and expansion characteristics, and also possess excellent anti-corrosion properties.
Alufast presents an advantage over steel screws by producing greater residual clamp forces on magnesium fastenings under operational thermal loads than is possible with steel screws. And the 20 to 50 percent cost saving, compared to steel screws with additional corrosion protection systems, complete the benefits package.
Contact details for UK customers:
Andrew FitzPatrick – Sales Manager
Tel: 01789 417850
The Arnold Group is a wholly owned subsidiary of the Würth Group, which, with over 60,000 employees and 387 companies world-wide, operates on a global basis with revenues of over 7 billion Euros.
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