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  2. French catheter scale - Wikipedia

    en.wikipedia.org/wiki/French_catheter_scale

    Thus, the outer diameter of a catheter in millimeters can be calculated by dividing the French size by 3. [2] For example, a catheter with a French size of 9 would have an outer diameter of approximately 3 mm. While the French scale aligns closely with the metric system, it introduces redundancy and the potential for rounding errors.

  3. Preferred metric sizes - Wikipedia

    en.wikipedia.org/wiki/Preferred_metric_sizes

    A standard metric (concrete) block is 190 mm wide, 390 mm long, and 190 mm high, which allows for 10 mm mortar joints in between bricks, giving a standard unit size of 200 mm square by 400 mm long. [3] A standard metric brick is 90 by 57 by 190 mm; with 10 mm of mortar, that produces a standard unit of 100 mm x 200 mm. [3]

  4. Square thread form - Wikipedia

    en.wikipedia.org/wiki/Square_thread_form

    The square thread form is a common screw thread profile, used in high load applications such as leadscrews and jackscrews. It gets its name from the square cross-section of the thread. [ 1 ] It is the lowest friction and most efficient thread form, but it is difficult to fabricate.

  5. Orders of magnitude (length) - Wikipedia

    en.wikipedia.org/wiki/Orders_of_magnitude_(length)

    10 Mm – approximate altitude of the outer boundary of the exosphere; 10.001 Mm – length of the meridian arc from the North Pole to the Equator (the original definition of the meter was based on this length) 40.000 Mm – length of the Ring of Fire; 60.000 Mm – total length of the mid-ocean ridges

  6. List of unusual units of measurement - Wikipedia

    en.wikipedia.org/wiki/List_of_unusual_units_of...

    [25] [26] The standard FIFA football pitch for international matches is 105 m (344 ft) long by 68 m (223 ft) wide (7,140 m 2 or 0.714 ha or 1.76 acres); FIFA allows for a variance of up to 5 m (16.4 ft) in length in either direction and 7 m (23.0 ft) more or 4 m (13.1 ft) less in width (and larger departures if the pitch is not used for ...

  7. 4.3-10 connector - Wikipedia

    en.wikipedia.org/wiki/4.3-10_connector

    The 4.3-10 connector (sometimes referred to as 4.3/10) is a 50 Ω multi-purpose RF connector used to connect coaxial cables with other cables or RF devices, such as transmitters or antennas. The IEC standard 61169-54 specifies an inner diameter of the outer conductor is 10 mm and the outer diameter of the inner conductor is 4.3 mm.

  8. 80-meter band - Wikipedia

    en.wikipedia.org/wiki/80-meter_band

    The nominal "80 meter" band begins at 3.5 MHz (85.7 m wavelength) and goes up to 4.0 MHz (74.9 m wavelength).The upper part of the band, mostly used for voice, is often referred to as 75 meters, since in Region 2, the wavelengths in that section are between 80–75 meters (adjacent to or overlapping a shortwave broadcast band called by the same name: "75 m").

  9. Mesh (scale) - Wikipedia

    en.wikipedia.org/wiki/Mesh_(scale)

    Equivalent mesh sizes from 5 μm to 25.4 mm also exist. [1] [2] [3] Available sieve sizes are usually regulated by standards. Those in common use are ISO 565:1990 and ISO 3310-1:2000 (international), [4] EN 933-1(European) [5] and ASTM E11:01 (US). EN standards are available with national 'badging'; so they appear as BS EN, FR EN, DE EN, etc.