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2. Screw thread - Wikipedia

   en.wikipedia.org/wiki/Screw_thread

   The minimum limits for external (or bolt, in ISO terminology), and the maximum limits for internal (nut), thread sizes are there to ensure that threads do not strip at the tensile strength limits for the parent material. The minimum limits for internal, and maximum limits for external, threads are there to ensure that the threads fit together.

3. Nut (hardware) - Wikipedia

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

   Sex bolt: Barrel nut, barrel bolt, binding barrel, Chicago screw, post and screw or connector bolt Has a barrel-shaped flange and protruding boss that is internally threaded Split nut: Split lengthwise into two pieces (opposed halves) so that its female thread may be opened and closed over the male thread of a bolt or leadscrew Sleeve nut ...

4. Unified Thread Standard - Wikipedia

   en.wikipedia.org/wiki/Unified_Thread_Standard

   The Unified Thread Standard (UTS) defines a standard thread form and series—along with allowances, tolerances, and designations—for screw threads commonly used in the United States and Canada. It is the main standard for bolts, nuts, and a wide variety of other threaded fasteners used in these countries.

5. ISO metric screw thread - Wikipedia

   en.wikipedia.org/wiki/ISO_metric_screw_thread

   It indicates the diameter of smooth-walled hole that a male thread (e.g. on a bolt) will pass through easily to connect to an internally threaded component (e.g. a nut) on the other side. For example, an M6 screw has a nominal outer diameter of 6 millimetres and will therefore be a well-located, co-axial fit in a hole drilled to 6 mm diameter.

6. Go/no-go gauge - Wikipedia

   en.wikipedia.org/wiki/Go/no-go_gauge

   In the right image, the top gauge is a thread gauge that is screwed into the part to be tested, the "GO" end should fully enter the part; the "NOT GO" end should not. The lower image is a plain plug gauge used to check the size of a hole; the green end is the go, and the red end is the no-go.

7. Screw - Wikipedia

   en.wikipedia.org/wiki/Screw

   The thread angle was 55°, and the depth and pitch varied with the diameter of the thread (i.e., the bigger the bolt, the coarser the thread). Spanners for Whitworth bolts are marked with the size of the bolt, not the distance across the flats of the screw head. The most common use of a Whitworth pitch nowadays is in all UK scaffolding.