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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. List of drill and tap sizes - Wikipedia

    en.wikipedia.org/wiki/List_of_drill_and_tap_sizes

    Example (metric coarse): For M7.0×1.0, major minus pitch yields 6.0, but 6.1 also works well. Example (metric fine): For M7.0×0.5, major minus pitch yields 6.5, which at 92.9% happens to be an example that pushes over the outer bound of the 90% ± 2 pp , but major minus pitch is still valid, although smaller drills (6.3 mm, 1 ⁄ 4 , 6.4 mm ...

  4. Trapezoidal thread form - Wikipedia

    en.wikipedia.org/wiki/Trapezoidal_thread_form

    The trapezoidal metric thread form is similar to the Acme thread form, except the thread angle is 30°. [ 4 ] [ 5 ] [ 6 ] It is codified by DIN 103. [ 7 ] While metric screw threads are more prevalent worldwide than imperial threads for triangular thread forms, the imperially sized Acme threads predominate in the trapezoidal thread form.

  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. Small Arms Protective Insert - Wikipedia

    en.wikipedia.org/wiki/Small_Arms_Protective_Insert

    The replacement for the S-SAPI in U.S. Army, the Enhanced Side Ballistic Inserts (ESBI, E-SBI), originally had only the 7" x 8" size, Small and medium were added later on. [14] The counterpart of the ESBI used by the U.S. Marines is called Enhanced Side Small Arms Protective Inserts (Enhanced S‐SAPI, Side ESAPI). [15]

  7. Helix angle - Wikipedia

    en.wikipedia.org/wiki/Helix_angle

    Helix Angle [clarification needed]. In mechanical engineering, a helix angle is the angle between any helix and an axial line on its right, circular cylinder or cone. [1] ...

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