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T-slot nuts 8 St heavy with guiding ridge are used for particularly high loads. Since the T-slot nut is adapted to the contour of the profile slot, tensile forces are optimally transferred to the aluminum profile. In addition, the version with guiding ridge has more load-bearing threads and therefore enables higher tightening torques. Furthermore, the high bar prevents tilting. This version of the T-slot nut can be moved easily in the profile groove. T-slot nuts heavy are inserted into the groove from the front of a profile. They are secured axially against shifting by a spring-loaded ball.