MAG-FORM® THREAD-FORMING FASTENERS
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MAG-FORM® THREAD-FORMING FASTENERS MINIMIZE DEBRIS GENERATION IN CRITICAL APPLICATIONS Standard thread-forming fasteners with a 60° flank angle create excess debris when driven into low-ductile materials. They can easily exceed the ductility limits of the material, causing damage to the formed threads. Mag-Form® fasteners are specifically designed with a broader flank angle to eliminate tapping operations while forming strong threads in conventional magnesium die-castings and similar materials. The design also minimizes debris, making Mag-Form® fasteners the optimal solution for critical applications such as electronics and air bag modules. BREAKTHROUGH SOLUTION Acument® worked with one of the world’s largest Tier automotive suppliers, a supplier devoted exclusively to the production of magnesium castings, to help them install the first magnesium shift tower in a production vehicle. Broad Flank Angle Wide-Spaced Threads The Tier supplier faced several design, engineering and assembly decisions for the four fastening points where the shift tower would be installed in the steel floor of the vehicle’s “body-inwhite” frame. These would be the only holes in the part, and the holes and the fastening system all had to be perfect. Rather than drilling the holes after the casting process – a high cost and timeconsuming procedure – the holes in the shift tower were molded during casting. The Tier supplier chose Acument® to develop the perfect fastener solution – a thread-forming Mag-Form® fastener developed specifically for the shift tower application: one that would fit the specs for the shift tower holes and allow follow-up removal and reinstallation over the life of the vehicle. Lobular configuration Wide-spaced thread design Broad flank angle that compresses, rather than roll-forms threads into the mating material Minimizes debris generation Forms strong threads in materials with low ductility Allows multiple removals and reinsertions, unlike standard fasteners Easily removed and reinserted for field service Standard 60° Flank Angle Thread-Forming Fasteners May exceed ductility limit of the material, causing damage to formed threads Mag-Form® Thread-Forming Fasteners Compressive action forms strong threads in low-ductile materials Standard Design Guidelines Sizes: Thread Design: Head Design: Drive System: Finish: MG1.0 to MG16 Wide-spaced thread with broad flank angle Can be used with any external or internal head designs Can be used with all systems, including the TORX PLUS® Drive System zinc and chromate to minimize galvanic corrosion

Suggested Hole Sizes for Die-Cast Magnesium* H Included Draft Angle 1° In order to utilize as much available screw strength as possible, the minimum length of thread engagement, excluding the two lead threads, should be equal to 2-1/2 times the basic screw size. Blind holes should be deep enough to allow a two-thread lead, with clearance, at the bottom of the hole. The included draft angle is 1.0°. Cored Blind Hole Drilled Hole * NOTE: Fastener sizes MG1.0 to MG2.5 and those used in squeeze-cast magnesium materials require different hole sizes than those shown here. please ® contact an...