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DIN7500 –Trilobular Thread Forming System

DIN7500 –Trilobular Thread Forming System

There are many types of thread-forming screws. One standard for thread forming screws is the DIN 7500. These screws can be driven into malleable materials without the need to tap the mating material.

Trilobular Thread-Forming Screws

There are some great advantages that come with using a DIN7500 thread forming screw from Bossard. These screws not only save money by eliminating the step of tapping, but they also avoid cross threading issues, lower scrapped costs, increase assembly time and reduce high tooling costs. These fasteners should be used if customers are looking to save time and save money. Based on years of data from Bossard customers, we know that thread-forming screws can reduce costs by up to 30 percent. However, these screws can still be used in tapping holes too, so there are a wide variety of possibilities when it comes to their uses.

When examining trilobular thread-forming screws, we see that the trilobular thread shape enables the threads to form the internal thread. The DIN7500 trilobular screw is designed with a tapered point or commonly referred to as lead threads. The tapered point allows for lower installation torque during initial thread forming. The trilobular shape is key to allowing the remaining threads to form threads with the lowest amount of installation torque. One important thing to note when determining screw length is that the tapered portion of the thread cannot be fully loaded and should not be used to calculate proper screw length. To be able to install the screws into malleable metals, most thread forming screws are usually made of zinc plated, case-hardened steel. For structural applications, screws can be made from alloy steel with induction hardened lead threads. A lubricant is usually applied to help reduce thread friction during installation.

For the best results, these thread-forming screws should be installed using machinery with torque monitoring capabilities. This could be done using automated fastening systems or by using manual power drivers. These screws can be removed and reinstalled at any time for repairs or service on the application. In the event the thread forming screw is lost during removal, a standard threaded machine screw can be used in its place.

The initial fastener cost for a trilobular screw is higher than a standard screw, but the elimination of the tapped thread, no cross threading and faster production rates are factored in, thread formers pays off in the long run.

For additional product information on DIN7500 thread-forming screws, technical support or product solutions, contact Bossard at ProvenProductivity@bossard.com.


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August 08, 2014

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