Ordering the wrong stud depth on a multifamily project doesn’t just delay one wall; it backs up drywall, MEP rough-in, and every trade behind it. Reordering eats up days, the schedule slips, and costs creep in before anyone even notices the mix-up. Most of the time, it’s just a spec misread at the submittal stage, and it’s a headache nobody wants.
Metal stud sizes use a standardized designation system, but the naming conventions trip up even seasoned pros. Web depth, flange width, and material thickness each mean something different in a callout, and it’s easy to mix up gauge with mils or design thickness with nominal size. That’s where most ordering mistakes start.
This guide breaks down the cold-formed steel (CFS) stud sizing system: how to actually read a callout, what the standard dimensions mean in real-world terms, and how to match stud selection to structural or non-structural use. There’s a size chart below and a look at the field conditions that force a spec change mid-project.
If you’re framing a mid-rise apartment, a strip center, or a mixed-use podium, the specs you lock in before fabrication make or break the install on the other end.
Read the Label Right Before You Order the Wrong Stud
Every CFS stud comes with a printed or labeled designation. It’s not random. It encodes four pieces of info in sequence, and misreading even one puts the wrong material on the truck.
How Member Depth, Stud Type, and Flange Width Show Up in a Callout
A typical CFS callout follows this pattern: web depth (in hundredths of an inch) + member type + flange width (in hundredths of an inch). The type letter flags the cross-section: S for stud and track combined, T for track, J for joist, U for channel.
For example, 600S162 means a 6-inch web depth, S for stud, and 1-5/8-inch flange width. It’s a complete statement: 6-inch stud with a 1-5/8-inch flange.
Another one: 362S125 is a 3-5/8-inch stud with a 1-1/4-inch flange. 250S162? That’s a 2-1/2-inch stud with a 1-5/8-inch flange. Depth changes load capacity and wall thickness; flange width affects fastener edge distance and panel rigidity. You can’t just swap them out on the job.
Why Gauge, Mils, and Design Thickness Aren’t the Same
Gauge is just a nominal label. Mils is the real base metal thickness, measured in thousandths of an inch. Design thickness is the minimum thickness used in calculations, and it’s a bit lower than the mil number to allow for manufacturing tolerances.
The SFIA Technical Guide for Cold-Formed Steel Framing Products is pretty clear: a 20-gauge stud is 33 mils with a design thickness of 0.0329 inches. A 16-gauge stud is 54 mils with a design thickness of 0.0538 inches. These numbers matter for load calcs, not just when you’re checking a bill of materials.
If you order by gauge alone without checking mil thickness against the spec, you’re leaving the door open for substitution mistakes. If the engineer called for 54 mil, make sure you get 54 mil. Doesn’t matter what the gauge label says.
What Codes Like 600S162, 362S125, and 250S162 Actually Tell You
These designations follow AISI S240, the North American Standard for Cold-Formed Steel Structural Framing. Every certified manufacturer uses the same system, so a 600S162-54 from any of them should match up dimensionally.
The number after the hyphen is the design thickness in mils. 600S162-54 means 6-inch stud, 1-5/8-inch flange, 54-mil design thickness (which is 16 gauge). Note both gauge and mils in your submittal, and you’ll avoid most ordering confusion.
At the Bonham, TX building center, each fabricated stud gets a unique ink label with its member designation, panel position, and project info. That kind of labeling takes the guesswork out of field assembly. Once you know how to read the callout, the next step is figuring out which depths and flanges your project actually needs.
The Metal Stud Sizes Chart Contractors Actually Need on Bid Day
Most estimators and framers keep a mental list of standard stud sizes. But that list usually misses the outliers: specialty applications, tall walls, heavy loads.
Common Web Depths From 1-5/8 Inch to 6 Inch and Beyond
Web depth controls wall thickness, insulation cavity, and structural strength. Here’s a rundown of standard depths for commercial and residential CFS framing:
| Designation Prefix | Web Depth | Common Applications |
|---|---|---|
| 162 | 1-5/8 in. | Shaft walls, furring, lightweight partitions |
| 250 | 2-1/2 in. | Interior partitions, low-height walls |
| 362 | 3-5/8 in. | Standard interior and exterior walls |
| 400 | 4 in. | Exterior walls with added insulation depth |
| 550 | 5-1/2 in. | Taller exterior walls, energy code compliance |
| 600 | 6 in. | Structural exterior walls, tall partitions |
| 800 | 8 in. | High-load bearing, multi-story applications |
| 1000 | 10 in. | Heavy structural, tall curtain wall assemblies |
| 1200 | 12 in. | Long-span, high-load structural framing |
Most residential and light commercial jobs stick with 362 and 600 depths. Taller buildings or walls with big wind loads? That’s when you’re looking at 800S162 or 1000S162 members.
Standard Flange Widths and When Wider Legs Help
Flange width decides how much bearing surface you get for sheathing, drywall, and track. The two most common: 1-1/4 inch (125) and 1-5/8 inch (162).
The 162 flange is the go-to for most structural and exterior walls. It gives more edge distance for fasteners, which matters for shear walls and panels with lateral loads. The 125 flange pops up in non-structural interior partitions where edge distance isn’t as critical.
Wider flanges (sometimes 2-inch/200 in specialty products) show up in curtain wall assemblies or spots where the stud has to carry cladding loads. Always double-check flange width against your fastener schedule before placing an order.
The wrong flange width can put screws too close to the edge when the wall’s under stress.
Typical Gauge Ranges for Interior and Structural Framing
Gauge choice depends on load and wall height. Non-structural interior walls usually run 25 gauge (18 mil) for low walls and 20 gauge (33 mil) for taller ones. Structural jobs almost always start at 20 gauge and get heavier from there.
- 25 Ga. (18 mil): Non-structural partitions, low interior walls
- 20 Ga. (33 mil): Load-bearing walls, standard structural
- 18 Ga. (43 mil): Heavier structural, taller load-bearing
- 16 Ga. (54 mil): High-load structural, multi-story bearing, headers
- 14 Ga. (68 mil): Heavy structural, transfer beams, moment frames
Specifying 16-gauge studs for a multi-story residential job isn’t overkill: it’s often exactly what the engineer wants for exterior bearing walls. The AISI S240-20 standard lays out the design framework that drives these choices. With the chart handy, the next step is deciding if your wall is structural or just holding up drywall.
Partition Wall or Load-Bearing Wall: Pick for the Real Job, Not the Shortcut
Using structural studs for a partition wall wastes money and material. Using drywall-grade studs for a load-bearing wall? That’s a risk you don’t want. The trouble spot is usually the gray area between those two, especially on mixed-use and multifamily projects.
Where Drywall Metal Studs Fit and Where Structural Studs Take Over
Drywall metal studs (non-structural) carry only finish loads: drywall, some wall fixtures, and a bit of lateral pressure from use. The SFIA Technical Note on limiting heights for nonstructural studs sets maximum wall heights based on depth, gauge, and deflection.
Structural studs handle axial loads from floors, roofs, and beams above, plus wind and seismic forces. They look similar, but the metal thickness, steel grade, and testing behind a structural stud are a different story.
If you mix the two in a submittal without clear labels, you’re just asking for jobsite substitutions. Label every stud in your framing plan as structural (load-bearing) or non-structural, and call out the full AISI designation with mil thickness for structural members.
How Stud Spacing, Wall Height, and Load Capacity Change the Spec
Stud spacing sets the wall’s allowable height for a given depth and gauge. For example, a 3-5/8-inch, 20-gauge stud at 16 inches on center reaches a different max height than the same stud at 24 inches. Wider spacing means less composite action. You’ll need a deeper or heavier stud.
Axial load matters too. A two-story bearing wall carries floor and roof loads that can bump a 20-gauge stud up to 18 or 16-gauge before height even comes into play. Always check the load table for your spacing and tributary area. Don’t just pick the lightest gauge that fits the depth.
Taller commercial interiors, hotel corridors, and open-plan offices often need 6-inch or 8-inch studs at 16 inches on center to hit both height and lateral stiffness requirements without extra bridging.
When Headers, Joists, and Tracks Need Heavier Members
Headers above doors and windows take on loads that regular studs would normally spread out across the wall. A solid box header (two structural studs back to back, sometimes with a filler) needs to be sized right for the job. If it’s too light, you’ll see deflection, cracked finishes, and eventually, repairs.
Floor joists and gable roof trusses connected to bearing walls send vertical loads into the top track and down through the stud. The track’s gauge should match or beat the stud at these connections. If a 16-gauge stud sits on a 20-gauge track, you’ve got a weak spot that won’t show up until the building is loaded.
Structural tracks (often called structural steel track in submittals) use the same designation system as studs but skip the flange lips. Always double-check track gauge against your stud spec before fabrication. Last-minute field changes to these selections can get messy once the steel’s already cut.
The Field Conditions That Push a Light Spec Into a Reorder
A spec might pass engineering review but still underperform if field conditions weren’t fully considered. Here are the usual scenarios where the framing crew realizes mid-job that the order was too light.
Deflection Limits, Lateral Load, and Wind Loads in Plain Language
Deflection just means movement under load. For framing, walls with tile or stucco finishes usually need to stay within L/360. So the wall can’t deflect more than its height divided by 360 under design lateral load. Drywall-only walls often use L/240, but L/360 gives a little more cushion, especially for tall walls.
Wind loads (especially in Texas, the Gulf Coast, or Oklahoma) can push you into deeper or heavier studs than vertical load alone would call for. For example, a 3-5/8-inch, 20-gauge stud might handle vertical loads on a two-story wall but fail the deflection test under 120-mph wind. That’s an engineering check, not something you want to discover in the field.
Lateral load demands ramp up at the base of tall curtain walls, building corners, and where the facade material changes. If these conditions weren’t in the original spec, a reorder is probably coming.
Why Slotted Track and Deflection Track Matter at the Top of Wall
At the top of a curtain wall or non-load-bearing exterior wall, you need to allow vertical movement as the structure above flexes. If you fix the stud at the top, that movement transfers straight into it, and non-structural studs just aren’t made for that.
Slotted track (deflection track) comes with vertical slots so the stud can float as the structure moves. The stud still handles lateral load but slides vertically. Skip it, and non-structural studs end up carrying loads they shouldn’t, which leads to cracked finishes.
Specify deflection track at the head of all non-load-bearing exterior walls, especially in multi-story jobs. Locking in this detail before fabrication saves you from expensive field modifications later.
How Web Stiffeners and Member Selection Help Control Movement
Web stiffeners (short pieces of track or flat steel) get welded or screwed into the web of a stud at bearing points. They stop the web from buckling under concentrated loads like a joist or beam bearing right on the stud.
Without web stiffeners at joist bearing spots, even a properly sized stud can fail locally. This crops up a lot in floor-to-floor connections with light-gauge steel. Add the stiffener note to your details before panels leave fabrication.
When you’re working with stucco or heavy cladding, factor in the dead load of the finish. Stucco at 10-12 pounds per square foot adds real demand on exterior studs, often pushing you to a deeper or heavier member than you’d use for drywall. Sorting these details before fabrication makes life much easier later.
What Smart Framing Teams Lock Down Before Fabrication Starts
The choices that keep your schedule intact happen before the first coil hits the machine. If you skip this checklist, you’ll pay for it in the field, usually when you can least afford the delay.
Coordinate Stud Sizes With Drywall, MEP Openings, and Finish Loads
Wall thickness comes from stud depth plus two layers of drywall or sheathing. For instance, a 3-5/8-inch stud with 5/8-inch drywall on each side gives you about 4-7/8 inches finished. That number matters for door frame openings, window sills, and lining up electrical boxes.
Machine-punched holes in CFS studs usually sit at 24-inch intervals. Make sure the hole size and spacing work for your MEP rough-ins before the studs get made. Changing punched locations in the field wastes time and can weaken the member if done without engineering input.
Pre-wired panels and MEP-integrated assemblies need studs deep enough for conduit bends and plumbing within the web. A 3-5/8-inch stud with standard punchouts works for most electrical runs. Plumbing may force you to a 6-inch depth to clear pipe diameter without cutting the web.
Match Galvanized Coatings and Thickness to the Exposure Risk
Galvanized coating shields CFS from corrosion, but the required class depends on exposure. Interior partitions in climate-controlled spaces usually use G40 or G60. Exterior wall studs, coastal jobs, or any spot with moisture exposure should go G90 at least.
Using G40 for exterior to save a few bucks creates a future headache. Inspectors and lenders now ask for coating documentation, especially on affordable housing and government work.
Check coating class against your project’s exposure during pre-construction. For commercial spray foam insulation or air-sealing assemblies, the steel/foam interface affects moisture management. Get the spec right before the wall closes up.
Use BIM and Prefabrication to Cut Rework Out of the Framing Package
Building Information Modeling (BIM) with Autodesk Revit gives you a precise material list tied to the 3D model. Every stud, track, header, and bridging member shows up with its designation, length, and location. That model feeds directly into automated fabrication, so you dodge the errors that happen when someone cuts from a hand-marked drawing.
Off-site fabrication means members are punched, dimpled, and cut to length before they hit the site. When panels show up already assembled and labeled, the field crew installs instead of fabricates. That shift, from cutting to connecting, is where off-site fabrication saves time and money most obviously. The trades get moving faster because the framing is right from the start.
Get the Framing Package Right While the Schedule Still Moves
Stud selection isn’t a one-time call at the estimate stage. It’s an ongoing choice that affects every trade down the line, from MEP rough-in to drywall and final inspection. Getting it right before fabrication is the surest way to keep your schedule and budget on track.
Panelized construction built on well-specified cold-formed steel framing can shrink framing timelines from weeks to days. Panels arrive cut to size, labeled for sequence, and ready to connect. The crew isn’t stuck sorting, cutting, or guessing what goes where.
If you’re within 500 miles of Dallas (Kansas City, Laredo, Amarillo, New Orleans), your framing package can go from model to panel without a single site cut. That’s what a correct stud spec enables when it ties into an off-site manufacturing process that actually builds what you designed.
Need a quote on your framing package? Call (469) 842-7794 or submit your project specs online for a fabrication estimate from a team building CFS framing systems across the south-central US.
Frequently Asked Questions
What Stud Width and Flange Size Should You Frame to Hit Your Wall Thickness and Finish Schedule?
Match stud depth to your target finished wall thickness minus two board thicknesses. A 3-5/8-inch stud with 5/8-inch drywall on each face gets you about 4-7/8 inches finished. For structural and exterior work, stick with a 1-5/8-inch flange. Use 1-1/4 inch only for non-structural interior partitions where fastener edge distance isn’t as critical.
Which Gauge and Spacing Should You Specify for Nonload-Bearing Partitions to Meet Code and Cut Rework?
Start at 25 gauge for low, non-load-bearing partitions and step up to 20 gauge as walls get taller. The SFIA Technical Note on nonstructural limiting heights lays out allowable heights by depth, gauge, and spacing. Run the table for your job rather than defaulting to one gauge for everything.
How Do You Confirm 1-5/8-Inch Stud Dimensions so Track, Corners, and Drywall Details Install Clean?
Check the full AISI designation (including mil thickness) on a 1-5/8-inch (162-series) stud before the order ships. Make sure track depth matches stud depth, and that corner bead profiles are right for your finished wall thickness. Mismatches at corners and jambs are a top cause of drywall callbacks on steel-framed jobs.
How Do You Confirm 3-5/8-Inch Stud Dimensions so Door Frames, Headers, and MEP Rough-In Stay on Layout?
Verify a 362S162 or 362S125 stud against your door frame rough opening specs and MEP punch-out schedule before fabrication. Standard service holes on a 3-5/8-inch stud fit most electrical conduit but might need custom knockout sizing for plumbing. Check header depth and gauge with the structural engineer before assembling the panel.
What Actual Depth and Flange Tolerances Should You Expect on 6-Inch Studs so Panelized Framing Shops Fabricate Without Field Fixes?
Per AISI S202, the standard for CFS structural framing, member depth tolerance on a 600-series stud is usually plus or minus 1/16 inch. Flange width tolerance is plus or minus 1/8 inch. Make sure your panelized framing fabricator certifies to these tolerances. Members outside that range can cause panel alignment issues at connection points.
What Punchout and Web Hole Limits Should You Call Out so Plumbing and Electrical Run Fast Without Weakening the Wall?
Standard AISI limits say unreinforced web holes in structural CFS studs can be no bigger than 50 percent of the flat web width and must be at least 24 inches apart (center to center). Holes closer together or bigger than that need web stiffeners or engineering review. Call out hole size, spacing, and edge distance on your submittal so fabrication gets it right the first time.