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2. Twelve-inch single - Wikipedia

   en.wikipedia.org/wiki/Twelve-inch_single

   A twelve-inch Capitol Records gramophone record. The twelve-inch single (often written as 12-inch or 12″) is a type of vinyl (polyvinyl chloride or PVC) gramophone record that has wider groove spacing and shorter playing time with a "single" or a few related sound tracks on each surface, compared to LPs (long play) which have several songs on each side.

3. List of drill and tap sizes - Wikipedia

   en.wikipedia.org/wiki/List_of_drill_and_tap_sizes

   Example (inch, coarse): For size 7 ⁄ 16 (this is the diameter of the intended screw in fraction form)-14 (this is the number of threads per inch; 14 is considered coarse), 0.437 in × 0.85 = 0.371 in. Therefore, a size 7 ⁄ 16 screw (7 ⁄ 16 ≈ 0.437) with 14 threads per inch (coarse) needs a tap drill with a diameter of about 0.371 inches.

4. Knuckle thread - Wikipedia

   en.wikipedia.org/wiki/Knuckle_thread

   Knuckle threads with a flat 30 degree flank thread angle are standardized in DIN 405 for inch pitches and diameters ranging from 8 mm to 200 mm. [3] A more recent standard DIN 20400 uses metric thread pitch and lists diameters from 10 mm to 300 mm. [4] As DIN is a German organization, many instances of the DIN thread charts [5] write numbers with a comma as the decimal marker.

5. Thread pitch gauge - Wikipedia

   en.wikipedia.org/wiki/Thread_pitch_gauge

   A thread gauge, [1] also known as a screw gauge [2] or pitch gauge, [3] is used to measure the pitch or lead of a screw thread. Thread pitch gauges are used as a reference tool in determining the pitch of a thread that is on a screw or in a tapped hole. This tool is not used as a precision measuring instrument, rather it allows the user to ...

6. Phonograph record - Wikipedia

   en.wikipedia.org/wiki/Phonograph_record

   Three vinyl records of different formats, from left to right: a 12 inch LP, a 10 inch LP, a 7 inch single. A phonograph record (also known as a gramophone record, especially in British English) or a vinyl record (for later varieties only) is an analog sound storage medium in the form of a flat disc with an inscribed, modulated spiral groove.

7. United States Standard thread - Wikipedia

   en.wikipedia.org/wiki/United_States_Standard_thread

   United States Standard thread (USS thread), also known as Sellers Standard thread, [1] Franklin Institute thread [1] and American Standard thread, [2] is a standard for inch based threaded fasteners and washers. [3] The USS standard is no longer supported. It, together with the SAE fastener standard, was incorporated into the Unified Thread ...