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2. Preferred metric sizes - Wikipedia

   en.wikipedia.org/wiki/Preferred_metric_sizes

   Machine screws with different thread diameters Hex key set with metric sizes from 2 mm to 10 mm according to sizes for use with ISO 262 screw sizes (except 3.5 mm for M6 internal set screw) For each size bolt or screw and type of head, there is a corresponding size driver prescribed by various ISO standards, including:

3. ISO metric screw thread - Wikipedia

   en.wikipedia.org/wiki/ISO_metric_screw_thread

   A metric ISO screw thread is designated by the letter M followed by the value of the nominal diameter D (the maximum thread diameter) and the pitch P, both expressed in millimetres and separated by a dash or sometimes the multiplication sign, × (e.g. M8-1.25 or M8×1.25).

4. 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 (an intended screw with a diameter of 7.0 mm and a pitch of 1 mm between each thread, which is considered coarse), 7.0 mm × 0.85 = 5.95 mm. The drill sizes that are near this are 15 ⁄ 64 in (85%), 6.0 mm (85.7%), and 6.1 mm (87.1%); any of these will work well. Example (metric, fine): For M7.0×0.5, 7. ...

5. Hex key - Wikipedia

   en.wikipedia.org/wiki/Hex_key

   Metric hex key set with sizes from 1.5 mm to 10 mm. Standard metric sizes are defined in ISO 2936:2014 "Assembly tools for screws and nuts—Hexagon socket screw keys", [16] also known as DIN 911. [17]

6. Screw - Wikipedia

   en.wikipedia.org/wiki/Screw

   Thus, an M6 screw, which has a pitch of 1 mm, is made by threading a 6 mm shank, and the nut or threaded hole is made by tapping threads into a hole of 5 mm diameter (6 mm − 1 mm). Metric hexagon bolts, screws and nuts are specified, for example, in International Standards ISO 4014, ISO 4017, and ISO 4032.

7. List of thread standards - Wikipedia

   en.wikipedia.org/wiki/List_of_thread_standards

   Metric Screw Threads - MJ Profile: V Thread Form BS 84: Tables of BS Whitworth, BS Fine and BS Pipe Threads: V Thread Form (55°) 1 ⁄ 4 ″-20 BSW ISO 68-1:1998: ISO general purpose screw threads—Basic profile—Part 1: Metric screw threads: V Thread Form ISO 68-2:1998: ISO general-purpose screw threads—Basic profile—Part 2: Inch screw ...