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Import and export must see: thickness notation you know - GAUGE number

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  What the Americans call GAUGE (abbreviated as Ga.) is a length measurement unit for diameters originating in North America and belongs to the Browne & Sharpe metering system. The larger the number of GAUGE, the smaller the diameter, and the later promotion is also used to indicate the thickness. Since the Ga. hexadecimal and the inch are different, there is no conversion formula. The comparison of the different unit systems is shown in the following table.
 
  Metal sheet Ga. number and actual thickness comparison table
 
GAUGE
(Ga.)
Steel
Galvanized steel
Stainless steel
Aluminum
Electrical steel
 
in (mm)
in (mm)
in (mm)
in (mm)
in (mm)
3
0.2391 (6.07)
-
-
-
-
4
0.2242 (5.69)
-
-
-
-
6
0.1943 (4.94)
-
-
0.162 (4.1)
-
7
0.1793 (4.55)
-
0.1875 (4.76)
0.1443 (3.67)
-
8
0.1644 (4.18)
0.1681 (4.27)
0.1719 (4.37)
0.1285 (3.26)
-
9
0.1495 (3.80)
0.1532 (3.89)
0.1563 (3.97)
0.1144 (2.91)
-
10
0.1345 (3.42)
0.1382 (3.51)
0.1406 (3.57)
0.1019 (2.59)
-
11
0.1196 (3.04)
0.1233 (3.13)
0.1250 (3.18)
0.0907 (2.30)
-
12
0.1046 (2.66)
0.1084 (2.75)
0.1094 (2.78)
0.0808 (2.05)
-
13
0.0897 (2.28)
0.0934 (2.37)
0.094 (2.4)
0.072 (1.8)
-
14
0.0747 (1.90)
0.0785 (1.99)
0.0781 (1.98)
0.0641 (1.63)
-
15
0.0673 (1.71)
0.0710 (1.80)
0.07 (1.8)
0.057 (1.4)
-
16
0.0598 (1.52)
0.0635 (1.61)
0.0625 (1.59)
0.0508 (1.29)
-
17
0.0538 (1.37)
0.0575 (1.46)
0.056 (1.4)
0.045 (1.1)
-
18
0.0478 (1.21)
0.0516 (1.31)
0.0500 (1.27)
0.0403 (1.02)
-
19
0.0418 (1.06)
0.0456 (1.16)
0.044 (1.1)
0.036 (0.91)
-
20
0.0359 (0.91)
0.0396 (1.01)
0.0375 (0.95)
0.0320 (0.81)
-
21
0.0329 (0.84)
0.0366 (0.93)
0.034 (0.86)
0.028 (0.71)
-
22
0.0299 (0.76)
0.0336 (0.85)
0.031 (0.79)
0.025 (0.64)
0.0310 (0.787)
23
0.0269 (0.68)
0.0306 (0.78)
0.028 (0.71)
0.023 (0.58)
0.0280 (0.711)
24
0.0239 (0.61)
0.0276 (0.70)
0.025 (0.64)
0.02 (0.51)
0.0250 (0.64)
25
0.0209 (0.53)
0.0247 (0.63)
0.022 (0.56)
0.018 (0.46)
0.0197 (0.50)
26
0.0179 (0.45)
0.0217 (0.55)
0.019 (0.48)
0.017 (0.43)
0.0185 (0.47)
27
0.0164 (0.42)
0.0202 (0.51)
0.017 (0.43)
0.014 (0.36)
-
28
0.0149 (0.38)
0.0187 (0.47)
0.016 (0.41)
0.0126 (0.32)
-
29
0.0135 (0.34)
0.0172 (0.44)
0.014 (0.36)
0.0113 (0.29)
0.0140 (0.35)
30
0.0120 (0.30)
0.0157 (0.40)
0.013 (0.33)
0.0100 (0.25)
0.011 (0.27)
31
0.0105 (0.27)
0.0142 (0.36)
0.011 (0.28)
0.0089 (0.23)
0.0100 (0.25)
32
0.0097 (0.25)
-
-
-
-
33
0.0090 (0.23)
-
-
-
0.009 (0.23)
34
0.0082 (0.21)
-
-
-
-
35
0.0075 (0.19)
-
-
-
-
36
0.0067 (0.17)
-
-
-
0.007 (0.18)
37
0.0064 (0.16)
-
-
-
-
38
0.0060 (0.15)
-
-
-
0.005 (0.127)
 
  In fact, the use of GAUGE to indicate the thickness can be traced back to the beginning of the industrial revolution in the United States. At that time, the people who produce wire needed to use a method to quantify the products they sold. Of course, the easiest method was the gravimetric method, but if the buyer only proposed to buy 15 pounds of wire, However, if the wire diameter is not specified, it will bring a lot of trouble. Therefore, the silk craftsmen will report the diameter according to the number of times the wire has been drawn. This is the origin of GAUGE. Since the wire diameter is reduced every time the drawing operation is performed, the more the number of drawing times, the smaller the diameter of the wire, and therefore, the larger the number of GAUGE, the smaller the diameter of the corresponding wire.
  At the time, steel mills found that it was easier to weigh the thickness than the thickness measurement. Therefore, similar to the wire, the steel plate can be sold by the basis weight method, and the thinner the corresponding steel plate thickness, the smaller the weight per square foot. Therefore, the steel mill believes that the most convenient way to specify the thickness of the steel plate is to establish the GAUGE number system of the steel plate by referring to the GAUGE number system adopted by the spinning industry.
  As for the historical origin of the GAUGE number, it may be determined by the level of productivity development at that time. In the United States in the 18th and 19th centuries, the industry standard was almost blank, so each manufacturer had to set its own standards. With the passage of time and the improvement of the industry level, the standards of these manufacturers have gradually become the same, and gradually established a unified wire standard wire gauge (SWG), manufacturer standard gauge (MSG) of steel plate materials and non-ferrous metals. American Wire Gauge (AWG).
  One confusing thing about the GAUGE number is that when you change from one GAUGE number to the next GAUGE number, the thickness and weight per unit area are not constant. In fact, if you plot these numbers into a graph, you will see an ”exponential decay curve.“
  In other words, the difference between consecutive GAUGE numbers becomes smaller as the GAUGE value increases. For example, the difference between 10Ga. and 11Ga. is 0.0149”, and the difference between 35Ga. and 36Ga is only 0.0008“. The reason for this difference can be traced back to the origin of the GAUGE number: the silk, which is dependent on the amount of reduction that can be achieved with each pull.
  In order to make a thin metal wire, the wiremaker wants to reduce the cross section as quickly as possible, but due to the metallurgical mechanism of material deformation, the amount of reduction in a single pass is limited. Over time, the wire industry has determined the optimal number of passes required for wire drawing. This is also the root cause of the exponential decay curve we see.
  It should be noted that when the non-ferrous metal plate and the steel plate are the same as a certain Ga. number, the thickness is actually different. For example, the standard steel thickness corresponding to 21Ga. is 0.0329 inches (0.84 mm); the thickness of the corresponding galvanized steel is 0.0366 inches (0.93 mm), and the thickness of the corresponding aluminum material is 0.028 inches (0.71 mm).