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CONSTRUCTION FIXINGS

New generation of screw

The HECO-UNIX full-threaded screw with contraction effect was successfully launched at the beginning of 2010. Now the benefits of this innovative thread form have been extended to a complete product range opening up new application possibilities for HECO-UNIX.

T

hat’s not all: the results of approval tests for HECO-UNIX show that considerable load advantages can be achieved in comparison with part-threaded screws, even at small fixture thicknesses.

Full product range – more design flexibility Whereas interior outfitters and cabinet makers have benefited

the most from the special features of the HECO-UNIX to date, this range expansion will also allow roofers, carpenters and joiners to utilise the full threaded screw. This expansion includes extra lengths and diameters as well as considerably more versions with T-drive. The range of A2 stainless steel façade screws has been complemented with a 4.5mm diameter version.

A new dimension in load-carrying capacity As the ratings based on existing approval designs show,

the tensile force capacity of the HECO-UNIX in timber-timber connections is considerably higher than the performance of conventional part-threaded screws. For example, the typical tensile load of a 5mm HECO-UNIX at a fixture thickness of 45mm is 2,655N. In comparison, the level of a comparable part- threaded screw is only 1,223N. The test results now available for the load-carrying capacity of the HECO-UNIX not only provide more security, but also facilitate the use of the screws many times over. This means that fewer mounting points will be necessary in the future, which in turn translates to labour and material savings.

fixture thicknesses > 4xd1. This reduces the number of required mounting points and increases security.

Advantages at a glance • The HECO-UNIX thread allows full and part-thread applications.

• Driving without gap, even in tough cases. • Fixing of timber components via the thread. • Based on the expert report for the ETA certification, considerably higher load level in terms of head pull-through resistance than assumed to date.

• Combi screw head: no damage to the fitting surface; improved milling features in wood thanks to milling grooves.

About the HECO-UNIX The HECO-UNIX is a patented full-threaded screw with

contraction effect. It features a variable thread pitch, which decreases from the tip of the screw to the head and pulls the timber components together without the need for extra measures. In addition, the components are axially fixed. In this aspect, the HECO-UNIX unites the features of a part-threaded screw with the advantages of a full-threaded screw. A further advantage of the HECO-UNIX is that the timber elements are not fixed by the head of the screw, but rather the thread. This allows a higher tensile load in terms of head pull-through resistance in

70 Fastener + Fixing Magazine • Issue 68 March 2011

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