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  2. Inch - Wikipedia

    en.wikipedia.org/wiki/Inch

    12 ⁠ ft. Metric ( SI) units. 25.4 mm. A fire hydrant marked as 3-inch. The inch (symbol: in or ″) is a unit of length in the British Imperial and the United States customary systems of measurement. It is equal to ⁠ 1 36 ⁠ yard or ⁠ 1 12 ⁠ of a foot. Derived from the Roman uncia ("twelfth"), the word inch is also sometimes used to ...

  3. Drill bit sizes - Wikipedia

    en.wikipedia.org/wiki/Drill_bit_sizes

    Metric drill bit sizes. Metric drill set, 1.0–6.0 mm by 0.1 mm, jobber length. The case that holds them in an indexed order (by size), via a graduated series of holes, is called a drill index. Metric drill bit sizes define the diameter of the bit in terms of standard metric lengths. Standards organizations define sets of sizes that are ...

  4. Millimetre - Wikipedia

    en.wikipedia.org/wiki/Millimetre

    The microwave is between 1 meter to 1 millimeter. The millimetre ( international spelling; SI unit symbol mm) or millimeter ( American spelling) is a unit of length in the International System of Units (SI), equal to one thousandth of a metre, which is the SI base unit of length. Therefore, there are one thousand millimetres in a metre.

  5. Vickers .50 machine gun - Wikipedia

    en.wikipedia.org/wiki/Vickers_.50_machine_gun

    The Vickers .5 inch machine gun (officially "Gun, Machine, Vickers, .5-in") also known as the Vickers .50 was a large-calibre British automatic weapon. The gun was commonly used as a close-in anti-aircraft weapon on Royal Navy and Allied ships, typically in a four-gun mounting (UK) or two-gun mounting (Dutch), as well as tanks and other armoured fighting vehicles.

  6. Nominal Pipe Size - Wikipedia

    en.wikipedia.org/wiki/Nominal_Pipe_Size

    Nominal Pipe Size (NPS) is a North American set of standard sizes for pipes used for high or low pressures and temperatures. [1] " Nominal" refers to pipe in non-specific terms and identifies the diameter of the hole with a non-dimensional number (for example – 2-inch nominal steel pipe" consists of many varieties of steel pipe with the only criterion being a 2.375-inch (60.3 mm) outside ...

  7. List of examples of lengths - Wikipedia

    en.wikipedia.org/wiki/List_of_examples_of_lengths

    1.0 mm — ⁠ 1 / 1000 ⁠ of a metre; 1.0 mm — 0.039 37 inches or 5 ⁄ 127 (exactly) 1.0 mm — side of square of area 1 mm 2; 1.0 mm — diameter of a pinhead; 1.5 mm — length of average flea; 2.54 mm — distance between pins on old DIP (dual-inline-package) electronic components; 5 mm — length of average red ant; 5.56×45mm NATO ...

  8. 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). If the pitch is the normally used "coarse" pitch listed in ISO 261 or ...

  9. Inch of water - Wikipedia

    en.wikipedia.org/wiki/Inch_of_water

    It is defined as the pressure exerted by a column of water of 1 inch in height at defined conditions. At a temperature of 4 °C (39.2 °F) pure water has its highest density (1000 kg/m 3). At that temperature and assuming the standard acceleration of gravity, 1 inAq is approximately 249.082 pascals (0.0361263 psi). [2]