The full-threaded HECO-UNIX screw with variable thread pitch and contraction effect is available in two versions: HECO-UNIX-plus and HECO-UNIX-top. The pitch of the UNIX thread decreases steadily in the centre section of the screw and is smaller in the rear thread range than at the tip of the screw. This enables the wooden components to be pulled together for a precise, gap-free fit without the need for any additional measures. Since the HECO-UNIX fixes the timber elements by the thread rather than the head of the screw, a high-performance, secure connection is created which allows a higher tensile load in comparison to head pull-through resistance. The technological features of the ETA-certified screw enable a wide range of applications, such as furniture-making, interior fitting, hardware installation and timber construction.