Steel sheet metal gauge chart

Steel sheet metal gauge chart

A gauge chart denotes the thickness of sheet metal, with measurements provided in inches or millimeters. Interpreting the reading is straightforward: lower gauge values correspond to thicker sheet metal. Thickness and gauge values correlate directly. Meaning a thinner sheets will yield higher gauge readings.

Various alloy grades possess unique properties, enabling customized selection for specific applications. Austenitic steels excel in extremely corrosive environments. Whereas grades like ferritic and martensitic are shine in applications requiring high strength and resilience. Selecting the appropriate gauge value hinges on comprehending the requirements of the application. For applications demanding robust materials, a 24 gauge sheet proves effective, although 18- and 16-gauge sheets are commonly used in general and industrial settings. Despite appearing thin upon visual inspection, a 14-gauge sheet is mechanically 2.86 times stronger than a 12-gauge steel sheet.

Sheet thickness varies based on application needs, influencing the metal grade selection. For instance, in the paper industry, where processing environments are harsh and exposed to steam and chemical gases, corrosion rates are accelerated. Hypochlorite bleach, commonly used in paper processing, poses a threat to most steels. Opting for thicker sheets helps mitigate corrosion risks, as they are less prone to buckling under pressure.

Various devices like gauges, micrometers, ultrasonics, and calipers can measure sheet thickness accurately. Among these, a screw gauge offers precise readings by reducing the gap between its walls upon screw rotation, with the number of screw turns corresponding to the gap. Ensuring the sheet lies flat on a horizontal surface during measurement is crucial for accuracy. Additionally, using a gauge wheel, featuring differently sized depressions with corresponding gauge numbers, provides convenient measurements.

Manufacturers generally follow order specifications when manufacturing sheets, ensuring thickness complies with ASTM standards. The thickness tolerance of a stainless steel sheet depends on the chosen ASTM standard or production specification. Generally though, the thickness tolerances lie between 0.018″ to 0.1874″.

Initially, sheet thickness readings are in millimeters, but they can be converted to inches by multiplying by a conversion factor of 0.03937. Mild steel and carbon steel have similar gauge values due to their comparable properties and densities, with mild steel’s high malleability enabling thinner sheets.

Steel sheet metal gauge chart in mm

Gauge/ Ga Thickness in mm
3 6.073
4 5.695
5 5.314
6 4.935
7 4.554
8 4.176
9 3.797
10 3.416
11 3.038
12 2.657
13 2.278
14 1.897
15 1.709
16 1.519
17 1.367
18 1.214
19 1.062
20 0.912
21 0.836
22 0.759
23 0.683
24 0.607
25 0.531
26 0.455
27 0.417
28 0.378
29 0.343
30 0.305
31 0.267
32 0.246
33 0.229
34 0.208
35 0.191
36 0.170
37 0.163
38 0.152

Steel sheet gauge thickness in inches

Gauge/ Ga Thickness in inch
3 0.2391
4 0.2242
5 0.2092
6 0.1943
7 0.1793
8 0.1644
9 0.1495
10 0.1345
11 0.1196
12 0.1046
13 0.0897
14 0.0747
15 0.0673
16 0.0598
17 0.0538
18 0.0478
19 0.0418
20 0.0359
21 0.0329
22 0.0299
23 0.0269
24 0.0239
25 0.0209
26 0.0179
27 0.0164
28 0.0149
29 0.0135
30 0.0120
31 0.0105
32 0.0097
33 0.0090
34 0.0082
35 0.0075
36 0.0067
37 0.0064
38 0.0060

Sheet metal gauge weight chart

Weight Per Area
Gauge/ Ga lb/ft² kg/m²
3 9.754 47.624
4 9.146 44.656
5 8.534 41.668
6 7.927 38.701
7 7.315 35.713
8 6.707 32.745
9 6.099 29.777
10 5.487 26.790
11 4.879 23.822
12 4.267 20.834
13 3.659 17.866
14 3.047 14.879
15 2.746 13.405
16 2.440 11.911
17 2.195 10.716
18 1.950 9.521
19 1.705 8.326
20 1.465 7.151
21 1.342 6.553
22 1.220 5.955
23 1.097 5.358
24 0.975 4.760
25 0.853 4.163
26 0.730 3.565
27 0.669 3.267
28 0.608 2.968
29 0.551 2.689
30 0.490 2.390
31 0.428 2.091
32 0.396 1.932
33 0.367 1.793
34 0.335 1.633
35 0.306 1.494
36 0.273 1.335
37 0.261 1.275
38 0.245 1.195

Hot rolled carbon steel sheet thickness tolerances

Gauge/ Ga Thickness in inch Tolerance
4 0.2242 ± 0.2332
± 0.2152
5 0.2092 ±0.2182
±0.2002
6 0.1943 ±0.2033
±0.1853
7 0.1793 ±0.1873
±0.1713
8 0.1644 ±0.1724
±0.1564
9 0.1495 ±0.1575
±0.1415
10 0.1345 ±0.1425
±0.1265
11 0.1196 ±0.1276
±0.1116
12 0.1046 ±0.1126
±0.0966
13 0.0897 ±0.0967
±0.0827
14 0.0747 ±0.0817
±0.0677
15 0.0673 ±0.0733
±0.0613
16 0.0598 ±0.0658
±0.0538
17 0.0538 ±0.0598
±0.0478
18 0.0478 ±0.0528
±0.0428

Cold rolled carbon steel sheet thickness tolerances

Gauge/ Ga Thickness in inch Tolerance
10 0.1345 ±0.1405
±0.1285
11 0.1196 ±0.1256
±0.1136
12 0.1046 ±0.1106
±0.0986
13 0.0897 ±0.0947
±0.0847
14 0.0747 ±0.0797
±0.0697
15 0.0673 ±0.0723
±0.0623
16 0.0598 ±0.0648
±0.0548
17 0.0538 ±0.0578
±0.0498
18 0.0478 ±0.0518
±0.0438
19 0.0418 ±0.0458
±0.0378
20 0.0359 ±0.0389
±0.0329
21 0.0329 ±0.0359
±0.0299
22 0.0299 ±0.0329
±0.0269
23 0.0269 ±0.0299
±0.0239
24 0.0239 ±0.0269
±0.0209
25 0.0209 ±0.0239
±0.0179
26 0.0179 ±0.0199
±0.0159
27 0.0164 ±0.0184
±0.0144
28 0.0149 ±0.0169
±0.0129