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2. North American Fire Hose Coupler Incompatibilities - Wikipedia

   en.wikipedia.org/wiki/North_American_Fire_Hose...

   [1] [25] 7.5 threads per inch were selected not just as a compromise between the 6, 7, and 8 threads per inch then in use, but because tools and methods had been developed to facilitate the conversion of existing 7 tpi and 8 tpi threads to 7.5 tpi threads, for couplings with an outside diameter ranging from 3 inches to 3 1/8 inches to the new ...

3. Tap and die - Wikipedia

   en.wikipedia.org/wiki/Tap_and_die

   where is the tap drill size, is the major diameter of the tap (e.g., 10 mm for a M10×1.5 tap), and pitch is the pitch of the thread (1.5 mm in the case of a standard M10 tap) and so the correct drill size is 8.5 mm. This works for both fine and coarse pitches, and also produces an approximate 75% thread.

4. List of drill and tap sizes - Wikipedia

   en.wikipedia.org/wiki/List_of_drill_and_tap_sizes

   Schematic of a machine tap. Below is a comprehensive drill and tap size chart for all drills and taps, imperial and metric, up to 36.5 millimetres (1.44 in) in diameter.. In manufactured parts, holes with female screw threads are often needed; they accept male screws to facilitate the building and fastening of a finished assembly.

5. Water pouring puzzle - Wikipedia

   en.wikipedia.org/wiki/Water_pouring_puzzle

   Again, if we restrict ourselves to reversible actions only, from the desired point (5,0), there are only two reversible actions: transferring 5 liter of water from the 12-liter jug to the 8-liter jug (0,5), or filling the empty 8 liter jug to full from the tap (5,8). Therefore, there are only two solutions to the problem:

6. Talk:Tap and die - Wikipedia

   en.wikipedia.org/wiki/Talk:Tap_and_die

   The tap-and-die sets I see sold are almost always plastic boxes holding 5 or 6 different sizes of inferior quality dies plus matching taps.Douglas W. Jones 13:52, 1 September 2017 (UTC) There is a variety of tap-and-die sets being sold, some that extend from the small machine screw sizes to larger fractional sizes. My own collection of taps and ...

7. Threading (manufacturing) - Wikipedia

   en.wikipedia.org/wiki/Threading_(manufacturing)

   In manufacturing, threading is the process of creating a screw thread.More screw threads are produced each year than any other machine element. [1] There are many methods of generating threads, including subtractive methods (many kinds of thread cutting and grinding, as detailed below); deformative or transformative methods (rolling and forming; molding and casting); additive methods (such as ...