Metal Stud Sizes Explained
Metal studs come in a variety of sizes to suit different structural needs. Understanding the dimensions, gauges, and labeling system is essential for selecting the right stud for your project.
Standard Metal Stud Widths
The most common metal stud widths are:
- 1 ⅝ inches
- 2 ½ inches
- 3 ⅝ inches
- 4 inches
- 6 inches
- 8 inches
- 10 inches
- 12 inches
- 14 inches
These refer to the width of the stud’s web (the flat center part). The most common size for interior non-load-bearing walls is 3 ⅝ inches, while 6-inch studs are common in structural applications.
Metal Stud Gauges (Thickness)
Metal studs come in various thicknesses, referred to as gauge. The lower the gauge, the thicker the metal.
- 25 gauge – Light-duty, non-structural
- 20 gauge – More rigid, used for taller or stronger non-load-bearing walls
- 18 & 16 gauge – Structural, load-bearing walls
Gauge affects strength, weight, and cost. For structural framing, 16 or 18 gauge is recommended.
Flange Sizes (Side Edges of the Stud)
Common flange widths include:
- 1 ¼ inches
- 1 ⅜ inches
- 1 ⅝ inches
- 2 inches
- 2 ½ inches
- 3 inches
- 3 ½ inches
Wider flanges provide more surface area for fastening and added stability, especially for taller walls or load-bearing applications.
Knockouts
Most metal studs have pre-cut holes (knockouts) for running wires and plumbing. These holes are spaced evenly along the web and eliminate the need for drilling, making installation faster and safer.
Nominal Sizes vs. Actual Sizes
Nominal sizes like 2×4 or 2×6 refer to approximations, not the stud’s actual width. Always check the precise measurement in inches and gauge.
How to Read a Metal Stud Label
Metal studs are often labeled using a standardized code. Example:
- 300S162-43
- 300 = Web size in 1/100ths of an inch → 3.00 inches
- S = Stud
- 162 = Flange size in 1/100ths of an inch → 1.625 inches
- 43 = Minimum base metal thickness → 0.043 inches (approx. 18 gauge)