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TIME-SERT insert. A threaded insert, also known as a threaded bushing, is a fastener element that is inserted into an object to add a threaded hole. [1] They may be used to repair a stripped threaded hole, provide a durable threaded hole in a soft material, place a thread on a material too thin to accept it, mold or cast threads into a work piece thereby eliminating a machining operation, or ...
Helical coil screw thread inserts have been in use for many years. It was first invented in the 1930s and found initial acceptance in aircraft manufactured and serviced by the Allied Air Forces during World War II. Since that time, applications for helical coil inserts have come into broad usage in aerospace, automotive and industrial equipment.
Draft angle design is an important factor when designing plastic parts. Because of shrinkage of plastic material, injection molded parts have a tendency to shrink onto a core. This creates higher contact pressure on the core surface and increases friction between the core and the part, thus making ejection of the part from the mold difficult.
A threaded fastener has internal or external screw threads. [7] The most common types are the screw , nut and bolt , possibly involving washers . Other more specialized types of threaded fasteners include captive threaded fasteners , stud , threaded inserts , and threaded rods .
A rivet nut, also known as a blind rivet nut, or rivnut, [1] is a one-piece internally threaded and counterbored tubular rivet that can be anchored entirely from one side. It is a kind of threaded insert. There are two types: one is designed to form a bulge on the back side of the panel as a screw is tightened in its threads.
Insert nuts are inserted into a pre-drilled hole by one of two means: screw in and hammer in. In both cases, the external protrusions bite into the wood, preventing the nut from either turning or pulling out. They are threaded internally and externally, the former provides stability for the bolt and the latter provides grip to the object.