![]() ![]() When working with small threads (M2/M3/M4).Removing and adding bolts can cause plastic threads to wear out. If you work with part assemblies that need to be disassembled regularly.There are several situations in which you might want to pick threaded inserts over tapped plastic threads. This geometry is harder to manufacture however, and as a result threaded inserts with diamond knurling tend to be more expensive than the simpler alternatives. Out of the different types of knurling, the checkered/diamond pattern knurls provide the best overall resistance. Straight knurling on a brass threaded insert. This gives extra resistance to pull-out forces. Some inserts come with grooves in-between sections of knurling. Its complicated geometry creates good resistance in all directions. This is the type of knurling that you are probably used to seeing most often. These knurls, often labeled as either left- or right-hand knurls, do a good job at providing resistance to forces in both directions. They provide a lot of grip to rotational force, but do not do much when it comes to pull-out force. There are different types of knurling patterns: It does this by providing resistance to pull-out force (the force of pulling the bolt out) and resistance to torque (rotational force). The knurling pattern is one of the factors that dictates how well the insert holds on to the plastic. ![]() Threaded inserts come with different knurling patterns on the outside. This always gets you the right diameter hole, but it does introduce an additional step. An alternative is to print an undersized hole and to drill it after printing. In order for the insert to have a good fit, you need to be able to 3D print accurate holes. ![]()
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