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2. Threaded insert - Wikipedia

   en.wikipedia.org/wiki/Threaded_insert

   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 ...

3. Insert nut - Wikipedia

   en.wikipedia.org/wiki/Insert_nut

   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.

4. T-nut - Wikipedia

   en.wikipedia.org/wiki/T-nut

   T-nuts. The left one has been inserted in the wood and a bolt has been screwed in from the other side. A T-nut, T nut, or tee nut (also known as a blind nut, [1] which can however also refer to a rivet nut or an insert nut, and likewise drive-in nut [2]) is a type of nut used to fasten a wood, particle or composite materials workpiece, leaving a flush surface.

5. Nut (hardware) - Wikipedia

   en.wikipedia.org/wiki/Nut_(hardware)

   Used to fasten a wood, particle or composite materials workpiece, leaving a flush surface. T-slot nut: T-groove nut Used with a threaded clamp to position and secure pieces being worked on in a workshop Wedge nut: Used for creating overhanging decks. Weld nut: Designed to be welded to another object Well nut: Rawlnut or Rawl nut (proprietary)

6. Fastener - Wikipedia

   en.wikipedia.org/wiki/Fastener

   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 .

7. Dutchman (repair) - Wikipedia

   en.wikipedia.org/wiki/Dutchman_(repair)

   When welding rails together using the Thermite process began at the start of the 20th century, a section of railhead approximately 3 ⁄ 4 inch (19 mm) long, also called a dutchman, was often placed between the sections being joined, with only the web and foot of the rail being new Thermite steel.