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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 ...
(in −1) (mm) (in) (mm) (in) (mm) (in) (mm) (mm) (mm) 1 ⁄ 16: 28: 0.907 0.3041 7.723 0.2583 6.561 5 ⁄ 32: 4.0 6.6: 6.8 1 ⁄ 8: 28: 0.907 0.3830 9.728 0.3372 8.566 5 ⁄ 32: 4.0 8.6: 8.8 1 ⁄ 4: 19: 1.337 0.5180 13.157 0.4506 11.445 0.2367: 6.0 11.5: 11.8 3 ⁄ 8: 19: 1.337 0.6560 16.662 0.5886 14.950 1 ⁄ 4: 6.4 15.0: 15.3 1 ⁄ 2: 14: ...
To help compare different orders of magnitude, this section lists lengths between 10 −3 m and 10 −2 m (1 mm and 1 cm). 1.0 mm – 1/1,000 of a meter; 1.0 mm – 0.03937 inches or 5/127 (exactly) 1.0 mm – side of a square of area 1 mm²; 1.0 mm – diameter of a pinhead; 1.5 mm – average length of a flea [27]
The new standards gave an inch of exactly 25.4 mm, 1.7 millionths of an inch longer than the old imperial inch and 2 millionths of an inch shorter than the old US inch.
2.12 mm = 1 ⁄ 4 of a barleycorn, [13] (thus 1 ⁄ 12 of an inch). Barleycorn: 8.47 mm = 1 ⁄ 3 of an inch, the notional base unit under the Composition of Yards and Perches. Digit: 19.05 mm = 3 ⁄ 4 inch Finger: 22.23 mm = 7 ⁄ 8 inch Inch: 25.4 mm: 3 barleycorns (the historical legal definition) Nail (cloth) 57.15 mm: 3 digits = 2 + 1 ...
As well as 1 ⁄ 4 in (6.4 mm) tape, studio and multitrack machines use tape widths of 1 ⁄ 2, 1, and 2 inches (12.7, 25.4, and 50.8 mm), and at least one 3 inches (76.2 mm) [citation needed] machine was available for a time. There is also a 35 mm width, but this variety is more similar to the motion picture stock of the same width. It is ...
The Washington Metro 4 ft 8 + 1 ⁄ 4 in (1,429 mm), the gauge is 1 ⁄ 4 inch (6 mm) less than 4 ft 8 + 1 ⁄ 2 in (1,435 mm) The trams in Nuremberg for one time nominally used 1,432 mm (4 ft 8 + 3 ⁄ 8 in), the gauge is 1 ⁄ 8 inch (3 mm) less than 4 ft 8 + 1 ⁄ 2 in (1,435 mm) The MTR uses 1,432 mm (4 ft 8 + 3 ⁄ 8 in) on most lines.
The typical range lies between 1 ⁄ 2 to 2 ⁄ 3 inch (12.7 to 16.9 mm) for the UK/US size system and 4 ⁄ 3 to 5 ⁄ 3 cm (13.3 to 16.7 mm) for the European size system, but may extend to 1 ⁄ 4 to 3 ⁄ 4 inch (6.4 to 19.1 mm) and 2 ⁄ 3 to 6 ⁄ 3 cm (6.7 to 20.0 mm).