SUMMER 2023

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134 THE DISTRIBUTOR’S LINK BRUNO MARBACHER THREAD-FORMING SCREWS FOR PLASTICS from page 94 DELTA PT-SCREW After expiration of the PT- patent, the Delta PT screw was developed. The V-shaped thread root is shallower, the breaking torque is therefore 50% higher. The geometry of the Delta-PT® is the result of analysis of the material displacement during thread-forming. Since the 20° or 30° angle respectively causes only slight radial stress, a thinwalled boss design can be realized. The thread flank also guarantees optimum material flow of the formed plastic, even in reinforced thermoplastic. its 30° thread flank angle barely produces radial stress during assembly. The displaced plastic flows well into the spaces between the threads. SPT SCREW The STP thread geometry has flank angles and radiuses that are optimized for strength, retention, and minimal stress. The tread profile with a unique thread angle on one side of the thread flank, changes from 37.5 to 30. Thus, offering low thread forming torque, eliminates the risk of relaxation. This thread is compatible with the Delta-PT thread. STP screws may be used as an alternative to the PT-screws. Delta-PT screw is through hardened like the PT-screws. There is a computer program available for determining the boss geometry of the boss as well as assembly conditions. DELTA-PT P The new type called Delta-PT P is made of a highperformance plastic (and is therefore suitable for lightweight and electrically or thermally insulating threaded joints in low strength thermoplastics. ECO-SYN-PLAST (FORMER ECO-SYN SCREW) The eco-syn-plast screw has the same excellent properties as the PT-screw. It’s ideal, despite a missing V-shaped root, for the assembly and joining into plastic. The somewhat bigger core diameter of the thread increases its breaking torque considerably. Thus, making it less likely to break during installations. The eco-syn-plast screw with HI-LO SCREWS Each screw has a double-lead high and low thread with the high thread having a 30°thread flank angle that further minimizes material displacement while providing positive thread engagement. The thread consists of a 30° thread and a second thread with a 60° flank angle and a smaller diameter. The helix angle of both threads is steep. Hi-Lo screws were originally designed for the assembly of dry walls. Due to the 30° thread, they are also used in plastics. Here, the pilot holes should be dimensioned in such a way that the 60° thread does not grip into the plastic material. Their vibration resistance is extremely low due to the high thread helix “quick in – quick out.” The thread end makes the screws unsuitable for repetitive assembly. CONTINUED ON PAGE 160
THE DISTRIBUTOR’S LINK 135 FASTENER FAIR USA NETWORKING PARTY - COUNTRY MUSIC HALL OF FAME, NASHVILLE, TN - MAY 16, <strong>2023</strong> CONTINUED ON PAGE 174
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SUMMER 2023

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