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2. Wheel sizing - Wikipedia

   en.wikipedia.org/wiki/Wheel_sizing

   The bolt circle diameter is typically expressed in mm and accompanies the number of bolts in your vehicle's bolt pattern. One example of a common bolt pattern is 5x100 mm. This means there are 5 bolts evenly spaced about a 100 mm bolt circle. The picture to the right is an example of a 5×100 mm bolt pattern on a Subaru BRZ. The wheel has 5 lug ...

3. Unified Thread Standard - Wikipedia

   en.wikipedia.org/wiki/Unified_Thread_Standard

   The standard designation for a UTS thread is a number indicating the nominal (major) diameter of the thread, followed by the pitch measured in threads per inch.For diameters smaller than ⁠ 1 / 4 ⁠ inch, the diameter is indicated by an integer number defined in the standard; for all other diameters, the inch figure is given.

4. Screw thread - Wikipedia

   en.wikipedia.org/wiki/Screw_thread

   The minor diameter is the lower extreme diameter of the thread. Major diameter minus minor diameter, divided by two, equals the height of the thread. The minor diameter of a nut is its inside diameter. The minor diameter of a bolt can be measured with go/no-go gauges or, directly, with an optical comparator.

5. British Association screw threads - Wikipedia

   en.wikipedia.org/wiki/British_Association_screw...

   The major diameter is given by 6p 1.2, [4]: 12 rounded to two significant figures in mm and the hex head size (across the flats) is 1.75 times the major diameter. BA sizes are specified by the following British Standards: BS 57:1951 — B.A. screws, bolts and nuts

6. Wrench size - Wikipedia

   en.wikipedia.org/wiki/Wrench_size

   For instance, a bolt for a 1-inch nominal diameter thread might have flats that are 1.5 inches apart. The wrench for this bolt should have flats that are between 1.508 and 1.520 inches apart to allow for a little extra space between the nut flats and the bolt flats. This means that the wrench slips easily over the bolt, and can be removed ...

7. Bolt circle - Wikipedia

   en.wikipedia.org/wiki/Bolt_circle

   A bolt circle diameter or pitch circle diameter ( PCD ), sometimes simply called bolt circle or pitch circle, is a common term for when a number of screw holes for bolts are evenly distributed with their centers along an imaginary circle with a given diameter . An example of use is mounting of car rims, where the bolt circle is one of several ...