What Is 7 ga Steel Thickness​

What Is 7 ga Steel Thickness?

Gauge sizes are numbers that indicate the thickness of a piece of steel sheet metal. 

Gauge is the abbreviation for "Gauge," a North American unit of length related to diameter. Gauge belongs to the Browne & Sharpe system of measurement, originally used in medicine and jewelry. Larger numbers indicate smaller diameters, and later also came to represent thickness.

Metal plates and steel sheets with the same gauge can actually have different thicknesses. Similarly, plates and tubes with the same gauge also have different values.

Metal sheet Ga and actual thickness 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)

7 Ga Steel Thickness

7 Ga Steel Thickness In Inches is 0.1793, just slightly less than 3/16 inches.

7 Ga Steel Thickness In millimeter is 4.554 mm.

7 ga Steel Sheet Weight

To calculate a 7 gauge steel sheet weight, we use the standard thickness of 0.1793 inches and the density of steel (490 lb/ft³ or 7,850 kg/m³). The weight depends on the sheet dimensions, but here's how to compute it for any size:

Step-by-Step Calculation

Thickness of 7 ga steel: 0.1793 inches (US Standard Gauge for Steel).

Density of steel: 490 lb/ft³ or 7,850 kg/m³

Per square foot weight = 0.01494ft × 490 lb/ft³ = 7.32 lb/ft²

Per square meter weight = 0.004554m × 7,850 kg/m³ = 35.75 kg/m²

Below is a complete technical summary of the thickness and weight specifications for 7 gauge steel sheet, based on the U.S. Standard Gauge for sheet steel:

Thickness

Measurement Type	Value
Exact Thickness	0.1793 inches
Millimeters	4.554 mm (0.1793" × 25.4)

Weight Calculations

Weight = Thickness × Area × Density

Steel Density:

• Carbon Steel: 490 lb/ft³ (7,850 kg/m³)

• Stainless Steel: 492 lb/ft³ (7,890 kg/m³)

Weight per Unit Area:

Unit	Carbon Steel Weight
Per sq. foot	7.32 lb/ft²
Per sq. meter	35.75 kg/m²

Common Sheet Sizes:

Sheet Size (ft)	Area (ft²)	Weight (lb)	Weight (kg)
4 × 8 steel sheet	32	234.2 lb	106.3 kg
4 × 10 steel sheet	40	292.8 lb	132.8 kg
5 × 10 steel sheet	50	366.0 lb	166.0 kg
6 × 12 steel sheet	72	527.0 lb	239.1 kg

10 ga vs 7 ga Steel

Thickness and Structures

The core distinction lies in material thickness, governed by the U.S. Standard Gauge system. A 10 gauge steel sheet measures 0.1345 inches, while 7 gauge material is substantially thicker at 0.1793 inches. 7 gauge steel enhances approximately 50% greater resistance to deformation under point loads and bending stress compared to 10 gauge steel.

Weight

A square foot of carbon steel weighs 5.49 lb at 10 gauge versus 7.32 lb at 7 gauge. Scale this to a standard 4' x 10' sheet, and the 7-gauge variant adds 73 lb (33 kg) per unit.

Corrosive and High-Stress

A 7 gauge 316L stainless steel tank liner in a chemical processing plant withstands chloride-induced pitting corrosion far longer than its 10 gauge steel counterpart due to greater material reserves before critical thickness is compromised.

Cost Benefits

While 7 gauge steel carries a 30–40% material premium over 10 gauge, its extended service life in corrosive/abrasive settings often delivers lower lifecycle costs.

Note: The larger the value of Gauge, the thinner the sheet.

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Which is Thicker, 3/16 or 7 Gauge?

3/16 inch (0.1875 inches) is greater than 7 gauge (0.1793 inches) by approximately 0.0082 inches or about 4.6%, making 3/16 inch thicker.

Nevertheless, it is important to acknowledge potential variations—for instance, if 7 gauge were interpreted under the AWG system for electrical wire, 7 AWG has a diameter of approximately 0.1443 inches, which would be thinner still, but given the absence of specific context and the common application of gauge in metalworking.

The sheet metal gauge is the appropriate benchmark, and additional factors like material type, manufacturing tolerances, or regional standards could introduce minor discrepancies, though these do not alter the fundamental conclusion that 3/16 inch exceeds 7 gauge in thickness under typical industrial conditions.