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In most of the world, sheet metal thickness is consistently specified in millimeters. In the U.S., the thickness of sheet metal is commonly specified by a traditional, non-linear measure known as its gauge. The larger the gauge number, the thinner the metal. Commonly used steel sheet metal ranges from 30 gauge to about 7 gauge.
A deep channel 1 + 5 ⁄ 8 in × 2 + 7 ⁄ 16 in (41 mm × 62 mm) version is also manufactured. The material used to form the channel is typically sheet metal with a thickness of 1.5 mm or 2.5 mm (12 or 14 gauge; 0.1046 inch or 0.0747 inch, respectively). [2] Types of channel
While China and Europe are connected by rail, and while both are mainly 1,435 mm (4 ft 8 + 1 ⁄ 2 in), the intervening Central Asia Railways are 1,520 mm (4 ft 11 + 27 ⁄ 32 in) gauge. There are discussions about facilitating an eventual linkage of the Chinese and European standard gauge system.
The gauge starts at the lowest gauge number of 5Ø or 00000, corresponding to the largest size of 0.500 inches (12.7 mm), and runs to the highest gauge number of 36, corresponding to the smallest size of 0.004 inches (0.10 mm). Size steps between gauges range from 0.001 inches (0.025 mm) between high gauge numbers to 0.046 inches (1.2 mm ...
No. 7/0, the largest size, is 0.50 in. (500 thou or 12.7 mm) dia., No. 1 is 0.30 in. ( 300 thou ), and the smallest, No. 50, is 0.001 in. ( 1 thou or 25.4 µm ). The system as a whole approximates an exponential curve , plotting diameter against gauge-number (each size is a approximately a constant multiple of the previous size).
(E.g. two 14 AWG wires have about the same cross-sectional area as a single 11 AWG wire.) This doubles the conductance. When the diameter of a solid round wire is doubled, the AWG will decrease by 6. (E.g. 1 mm diameter wire is ~18 AWG, 2 mm diameter wire is ~12 AWG, and 4 mm diameter wire is ~6 AWG).
See 7 + 1 ⁄ 2 in (190.5 mm) gauge ridable miniature railways: 210 mm 8 + 1 ⁄ 4 in: See 8 + 1 ⁄ 4 in (210 mm) gauge ridable miniature railways: 229 mm 9 in: See 9 in (229 mm) gauge ridable miniature railways: England: Railway built by minimum gauge pioneer Sir Arthur Heywood, later abandoned in favor of 15 in (381 mm) gauge. 240 mm 9 + 7 ...
So S355 has a minimum yield strength of 355 MPa for the smallest thickness range covered by the relevant standard – i.e. EN10025. ... X2CrNi19-11 X2CrNi18-10: 304 ...