What does “GAUGE” in aluminum plate mean?

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Ga. is the abbreviation of GAUGE, used to indicate thickness, the larger the value of Gauge, the thinner the sheet.

Ga. is the abbreviation of GAUGE, a length measurement unit of diameter originating in North America, belonging to the Brown & Sharpe measurement system. At the beginning of 1869, J.R. Brown and L. Sharp of the United States sold the outer micrometer developed for commercial sale, and initially established the measurement system. Originally used in medicine and jewelry, the larger the number, the smaller the diameter, and it was later popularized to indicate thickness.

Gauge Measurement Tool

GAUGE Measurement Tool

GAUGE

When the non-ferrous metal plate and the steel plate are of same Ga., the thickness is actually different, and the values of the plates and pipes of the same Ga. are also different.

Example:

16Ga. Corresponding:

Steel thickness is 0.0598 inches;
Aluminum thickness is 0.0508 inches

“GAUGE” Comparison Table Of Aluminium And Steel

1 ga = 1/100 mil = 1/100,000 inch = 25.4/100000 millimetre = 0.254 micrometre

Aluminum Thickness

Gauge (Ga.)

Standard Steel Thickness
(mm) (inches) (mm) (inches)
5.82676 0.2294 3 6.07314 0.2391
5.18922 0.2043 4 5.69468 0.2242
4.62026 0.1819 5 5.31368 0.2092
4.1148 0.162 6 4.93522 0.1943
3.66522 0.1443 7 4.55422 0.1793
3.2629 0.1285 8 4.17576 0.1644
2.90576 0.1144 9 3.7973 0.1495
2.58826 0.1019 10 3.4163 0.1345
2.30378 0.0907 11 3.03784 0.1196
2.05232 0.0808 12 2.65684 0.1046
1.8288 0.072 13 2.27838 0.0897
1.62814 0.0641 14 1.89738 0.0747
1.45034 0.0571 15 1.70942 0.0673
1.29032 0.0508 16 1.51892 0.0598
1.15062 0.0453 17 1.36652 0.0538
1.02362 0.0403 18 1.21412 0.0478
0.91186 0.0359 19 1.06172 0.0418
0.8128 0.032 20 0.91186 0.0359
0.7239 0.0258 21 0.83566 0.0329
0.64262 0.0253 22 0.75946 0.0299
0.57404 0.0226 23 0.68326 0.0269
0.51054 0.0201 24 0.60706 0.0239
0.45466 0.0179 25 0.53086 0.0209
0.40386 0.0159 26 0.45466 0.0179
0.36068 0.0142 27 0.41656 0.0164
0.32004 0.0126 28 0.37846 0.0149
0.28702 0.0113 29 0.3429 0.0135
0.254 0.01 30 0.3048 0.012
0.22606 0.0089 31 0.2667 0.0105
0.2032 0.008 32 0.24638 0.0097
0.18034 0.0071 33 0.2286 0.009
0.16002 0.0063 34 0.20828 0.0082
0.14224 0.0056 35 0.1905 0.0075

From: GAUGE

Common Aluminum Plate Specification Thickness:

6 gauge aluminum thickness sheet

8 gauge aluminum thickness sheet

10 gauge aluminum thickness sheet

12 ga aluminum thickness sheet

14 gauge aluminum thickness sheet

16 ga aluminum thickness sheet

18 ga aluminum thickness sheet

20 gauge aluminum thickness sheet

22 gauge aluminum thickness sheet

24 ga aluminum thickness sheet

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