Machinery's Handbook, 31st Edition
2706 Sheet Metal Gages Sheet Metal Gages.— Thicknesses of steel sheets given in Table 2 are based upon a weight of 41.82 pounds per square foot per inch of thickness, which is known as the Man ufacturers’ Standard Gage for Sheet Steel. This gage differs from the older United States Standard Gage for iron and steel sheets and plates, established by Congress in 1893, based upon a weight of 40 pounds per square foot per inch of thickness which is the weight of wrought-iron plate. Table 2. Sheet Metal Gages in Approximate Decimals of an Inch Gage No. Steel Gage a B.G b . Galvanized Sheet Zinc Gage Gage No. Steel Gage a B.G. b Galvanized Sheet Zinc Gage 15 ∕ 0 … 1.000 … … 20 0.0359 0.0392 0.0396 0.070 14 ∕ 0 … 0.9583 … … 21 0.0329 0.0349 0.0366 0.080 13 ∕ 0 … 0.9167 … … 22 0.0299 0.03125 0.0336 0.090 12 ∕ 0 … 0.8750 … … 23 0.0269 0.02782 0.0306 0.100 11 ∕ 0 … 0.8333 … … 24 0.0239 0.02476 0.0276 0.125 10 ∕ 0 … 0.7917 … … 25 0.0209 0.02204 0.0247 … 9 ∕ 0 … 0.7500 … … 26 0.0179 0.01961 0.0217 … 8 ∕ 0 … 0.7083 … … 27 0.0164 0.01745 0.0202 … 7 ∕ 0 … 0.6666 … … 28 0.0149 0.01562 0.0187 … 6 ∕ 0 … 0.6250 … … 29 0.0135 0.01390 0.0172 … 5 ∕ 0 … 0.5883 … … 30 0.0120 0.01230 0.0157 … 4 ∕ 0 … 0.5416 … … 31 0.0105 0.01100 0.0142 … 3 ∕ 0 … 0.5000 … … 32 0.0097 0.00980 0.0134 … 2 ∕ 0 … 0.4452 … … 33 0.0090 0.00870 … … 1 ∕ 0 … 0.3964 … … 34 0.0082 0.00770 … … 1 … 0.3532 … … 35 0.0075 0.00690 … … 2 … 0.3147 … … 36 0.0067 0.00610 … … 3 0.2391 0.2804 … 0.006 37 0.0064 0.00540 … … 4 0.2242 0.2500 … 0.008 38 0.0060 0.00480 … … 5 0.2092 0.2225 … 0.010 39 … 0.00430 … … 6 0.1943 0.1981 … 0.012 40 … 0.00386 … … 7 0.1793 0.1764 … 0.014 41 … 0.00343 … … 8 0.1644 0.1570 0.1681 0.016 42 … 0.00306 … … 9 0.1495 0.1398 0.1532 0.018 43 … 0.00272 … … 10 0.1345 0.1250 0.1382 0.020 44 … 0.00242 … … 11 0.1196 0.1113 0.1233 0.024 45 … 0.00215 … … 12 0.1046 0.0991 0.1084 0.028 46 … 0.00192 … … 13 .0897 0.0882 0.0934 0.032 47 … 0.00170 … … 14 0.0747 0.0785 0.0785 0.036 48 … 0.00152 … … 15 0.0673 0.0699 0.0710 0.040 49 … 0.00135 … … 16 0.0598 0.0625 0.0635 0.045 50 … 0.00120 … … 17 0.0538 0.0556 0.0575 0.050 51 … 0.00107 … … 18 .0478 0.0495 0.0516 0.055 52 … 0.00095 … … 19 0.0418 0.0440 0.0456 0.060 … … … … … a Manufacturers’ Standard Gage for Sheet Steel b B.G. is the Birmingham Gage for sheets and hoops. The United States Standard Gage (not shown above) for iron and steel sheets and plates was established by Congress in 1893 and was primarily a weight gage rather than a thickness gage. The equivalent thicknesses were derived from the weight of wrought iron. The weight per cubic foot was taken at 480 pounds, thus making the weight of a plate 12 inches square and 1 inch thick, 40 pounds. In converting weight to equivalent thickness, gage tables formerly published con- tained thicknesses equivalent to the basic weights just mentioned. For example, a No. 3 US gage represents a wrought-iron plate having a weight of 10 pounds per square foot; hence, if the weight per square foot per inch thick is 40 pounds, the plate thickness for a No. 3 gage = 10 ÷ 40 = 0.25 inch, which was the original thickness equivalent for this gage number. Because this and the other thickness equivalents were derived from the weight of wrought iron, they are not correct for steel.
Copyright 2020, Industrial Press, Inc.
ebooks.industrialpress.com
Made with FlippingBook - Share PDF online