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  2. Four-dimensional space - Wikipedia

    en.wikipedia.org/wiki/Four-dimensional_space

    As an example, the distance squared between the points (0,0,0,0) and (1,1,1,0) is 3 in both the Euclidean and Minkowskian 4-spaces, while the distance squared between (0,0,0,0) and (1,1,1,1) is 4 in Euclidean space and 2 in Minkowski space; increasing b 4 decreases the metric distance. This leads to many of the well-known apparent "paradoxes ...

  3. Torx - Wikipedia

    en.wikipedia.org/wiki/Torx

    A security Torx L-key and fastener with holes for a safety pin to hinder disassembly with an ordinary Torx key. A Torx T8 screw head on a hard disk drive.. Torx (pronounced / t ɔːr k s /) is a trademark for a type of screw drive characterized by a 6-point star-shaped pattern, developed in 1967 [1] by Camcar Textron.

  4. American wire gauge - Wikipedia

    en.wikipedia.org/wiki/American_wire_gauge

    The next wire size larger than 4/0 has a cross section of 250 kcmil. A circular mil is the area of a wire one mil in diameter. One million circular mils is the area of a circle with 1,000 mil (1 inch) diameter.

  5. 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.

  6. ASTM F568M - Wikipedia

    en.wikipedia.org/wiki/ASTM_F568M

    This standard defines property classes, the metric equivalent of a screw grade, that are almost identical to those defined by ISO 898-1, [2] except for the addition of the 8.8.3 and 10.9.3 classes. These two additional standards are fasteners that have the same mechanical properties as their base property class (i.e. 8.8 and 10.9), but are made ...

  7. ASTM A354 - Wikipedia

    en.wikipedia.org/wiki/ASTM_A354

    ASTM A354 is an ASTM International standard that defines chemical and mechanical properties for alloy steel bolts, screws, studs, and other externally threaded fasteners. It is officially titled: Standard Specification for Quenched and Tempered Alloy Steel Bolts, Studs, and Other Externally Threaded Fasteners. [1]

  8. 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 ...

  9. Human penis size - Wikipedia

    en.wikipedia.org/wiki/Human_penis_size

    A subgroup of 311 men reported an average erect circumference of 10.5 cm (4.1 in) and average erect length of 12.9 cm (5.1 in); additionally, it was reported for the same subgroup had an average flaccid glans diameter 2.6 cm (1.0 in), an average erect glans diameter 3.4 cm (1.3 in), an average flaccid glans length 2.7 cm (1.1 in), and an ...

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