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  2. Thread restorer - Wikipedia

    en.wikipedia.org/wiki/Thread_restorer

    A thread restorer is a tool used to fix threads on nuts or bolts that have become damaged. One type of thread restorer is a thread restoring file or thread file. [1] There are other types of thread restoring tools as well, for example a chaser tap or chaser die. [2] Normal taps and dies can also be used to clean up a thread, which is called ...

  3. Screw extractor - Wikipedia

    en.wikipedia.org/wiki/Screw_extractor

    A screw extractor held in a tap wrench. A screw extractor is a tool for removing broken or seized screws.There are two types: one has a spiral flute structure, commonly called an easy out after the trademarked name EZ-Out; [clarification needed] the other has a straight flute structure.

  4. Barrel threads - Wikipedia

    en.wikipedia.org/wiki/Barrel_threads

    If the barrel, receiver and bolt are not fitted properly, severe and potential fatal problems can arise due to faulty headspace, e.g. cartridge overpressure and case rupture. Threaded barrels are often mounted to the receiver with a lot of torque, and will therefore generally require tools for assembly and disassembly, such as a suitable action ...

  5. Tap and die - Wikipedia

    en.wikipedia.org/wiki/Tap_and_die

    While modern nuts and bolts are routinely made of metal, this was not the case in earlier ages, when woodworking tools were employed to fashion very large wooden bolts and nuts for use in winches, windmills, watermills, and flour mills of the Middle Ages; the ease of cutting and replacing wooden parts was balanced by the need to resist large amounts of torque, and bear up against ever heavier ...

  6. List of screw drives - Wikipedia

    en.wikipedia.org/wiki/List_of_screw_drives

    The hex head is used to drive the bolt into the countersunk hole, then either a wrench or hammer is used to break the shank and hex head from the flat head, or it is driven until the driving head shears off. Either method leaves only a smooth bolt head exposed. This type of bolt is commonly used with prison door locks, automobile ignition ...

  7. Hex key - Wikipedia

    en.wikipedia.org/wiki/Hex_key

    The tool is simple, small and light. The contact surfaces of the screw or bolt are protected from external damage. There are six contact surfaces between bolt and driver. Very small bolt heads can be accommodated. The tool allows the use of headless and recessed-head screws. The screw can be held by the key while it is inserted into its hole.

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