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The following article was published in our article directory on June 3, 2016.
Learn more about SpinDistribute Article Distribution System.
Article Category: Business
Author Name: Eric Lenz
Everything You Need to Know About Plastic Fastener Threading
Plastic Fastener Threading: what do you need to know?
No two screws are created alike. Just look all the different kinds of screw heads there on the market. Just like there are different kinds of screw heads used for different reasons, the threading on those screws can also vary depending on the application.
Metal, drywall, and stone require different products, but perhaps the most challenging product of all is plastic. It is also a much lower density material than metal.
When fastening plastic materials, you'll need to think carefully about the fastener threading on the screws you select.
Select a narrow flank angle
Type A and type AB screws are specifically made for applications that include metal. They have a wide thread profile, or flank angle, of 60 degrees. This creates high radial force, creating outward stress and possible damage when screwing into a softer material.
Plastic fastener threading is designed with narrower threading profiles that range from 29 degrees to 45 degrees, depending upon the plastic being used. Although they are able to displace the same volume of material as screws with a 60-degree thread profile, fasteners with a smaller thread profile can reduce the radial force by one-half. Tri-lobed screws with slender thread angles are popular in this regard because they form deep internal threads while generating less hoop stress.
With the reduction in radial stress, fasteners made for plastics can utilize smaller bosses, which can reduce the overall costs linked to material usage and molding cycle times.
Maximize stripping torque and increase resistance to pullout
When it comes to plastic materials, it's also important to maximize stripping torque, which is the torque needed for the fastener's thread to strip the plastic. Self-tapping screws are usually effective in this regard, particularly if the holes are pre-drilled. The thread spacing should be wider than a traditional screw used with metal.
Traditional screws can also cause problems when it involves the potential for pullout. A greater area of thread engagement can help guarantee this doesn't happen.
Plastic fasteners generally have a smaller minor diameter and a higher thread profile, allowing the screw to contain a larger volume of material, making the screw less resistant to pullout.
The type of plastic matters
When it concerns plastic fastener threading, different types of plastics have different properties, so the type of plastic you're using in your application also matters. When it comes to commercial-grade plastics, fasteners with blunt points are ideal. A fastener with a slotted shank works well with plastics like phenolics, while the hardest plastics may require a slotted-shank screw with a conical point.
Even screws with plastic fastener threading can cause problems for some materials. A nail-type faster may be the solution because it has barbs and rings that more effectively bite into the plastic than standard threads.
Ideal performance with reduced cost
Ultimately, choosing a fastener with the right threading can ensure optimal performance and reduced costs. The proper fastener can provide you with higher strip-out torque values, an increased resistance to loosening, and higher pullout values. In addition to the reduced costs in regards to material usage and cycling times, you can streamline the assembly process and eliminate the need for inserts and adhesives.
Keywords: plastic screws
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