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A screw sets new standards

In developing the latest, ergonomic SXC5 drilling screw, SFS has again set new standards. Though perhaps not evident at first sight, it is the massively increased technical parameters which really make this component so different to conventional drilling screws – particularly when it comes to its main application, the increasingly important sandwich panel construction area.

Added Value


  • Larger flange and head diameter
  • Asymmetric threading
  • 50% increase over the previous tear-out performance, thus reducing the number of fastener positions and optimising the thickness of the substructure

Creative minds and high expertise

Eight creative thinkers launched the development project at SFS. Intensive thought showers during a dedicated workshop provided a wide range of product concepts. Two months later, 27 different ideas were critically evaluated, with just two making it through to the final round.

Martin Rüdisühli, Project Manager SFS:

“At SFS we always try to get close to our customers and partners. Over the past five years we have together identified a trend towards ever thinner substructures. This made us aware that drilling screws with improved technical parameters would have a great future.”

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SXC5

From prototype to SXC5

The project team developed 15 different variants for each of the two competing designs, with the next step being to produce and trial 30 different prototypes: an essential capability available to SFS in-house. In up to 20 separate production steps the individual drilling screws were manufactured and put to the test using realistic conditions with the sole aim of increasing the key technical parameters.

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An innovative fastener with countless advantages

Achieving a larger flange and head diameter were clearly the least problematic issues; likewise, the project team soon managed to create the required asymmetric threading, visible to the naked eye, by working closely with manufacturing colleagues. The real challenge lay in the micro-metre adjustments required. Nevertheless, these creative minds managed to achieve a massive 50% increase over the previous tear-out performance. The thread geometry of an individual SXC5 could be adjusted to offer the customer two savings: either reducing the number of fastener positions and/or optimising the thickness of the substructure. Both options translate into considerable savings for the customer.

Used technologies

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