What Sizes Does Aluminum Plate Come In? 6061, 7075, and 7050 Stock Thicknesses and Dimensions
By Frodo Baggins
Before you can order aluminum plate you have to know what shapes it actually exists in, and this is where a lot of drawings go wrong. Specifying a 1.375 inch plate or a 72 inch width is easy to do in CAD and expensive to do in reality. Plate is a mill product, produced in a defined ladder of thicknesses and a small number of master sizes, and material that falls outside that ladder becomes a special mill order with a lead time measured in months. Here is what 6061, 7075, and 7050 plate actually comes in, which sizes ship today, and how to design so your material is not the thing holding up the job.
In Short
- →Mill master plate comes in 48.5 x 144.5 and 60.5 x 144.5 inches, with 48.5 x 96.5 also common. The extra half inch is deliberate, so you can trim to a clean edge.
- →0.250 inch is the dividing line. Below it the product is sheet, above it the product is plate, and that boundary changes the temper you can buy: 6061-T6 below 0.250, 6061-T651 at 0.250 and above.
- →We stock 6061-T651 from 0.25 through 10 inches, and 7075 and 7050 from 0.25 through 6 inches, in 48 and 60 inch widths and 96 and 144 inch lengths.
- →Thickness availability is not uniform. The common ladder runs in sixteenths and eighths up to 1 inch, then quarters to 3 inches, then half-inch and inch steps above that. Off-ladder thicknesses mean a mill order.
- →Designing to a standard thickness rather than an off-ladder one is often the difference between shipping this week and waiting 12 to 20 weeks.
Standard Mill Master Plate Sizes
Aluminum plate is rolled and shipped in master sizes. Nearly all North American plate arrives in one of three footprints, and everything you buy cut-to-size is cut out of one of them. Note that the dimensions carry a deliberate half-inch of overage: a plate described as 48 x 144 is produced at 48.5 x 144.5, so the buyer can trim mill edges and still hit nominal.
The three master footprints, drawn to scale
Proportional to real width and length. Everything you buy cut-to-size comes out of one of these three, so nesting your parts against these aspect ratios before you order is where yield is won or lost.
| Master size | Actual dimensions | Square feet | Notes |
|---|---|---|---|
| 48 x 96 | 48.5 x 96.5 in | 32.5 | Half-length plate, easier handling and freight |
| 48 x 144 | 48.5 x 144.5 in | 48.7 | The most common aerospace and industrial master size |
| 60 x 144 | 60.5 x 144.5 in | 60.7 | Widest standard. Best yield on large parts |
Where Sheet Ends and Plate Begins
The 0.250 inch boundary is not arbitrary and it matters more than most buyers realize, because it determines which tempers you can even buy. Below 0.250 inch the product is classified as sheet, and 6061 is supplied as T6. At 0.250 inch and above it is plate, and 6061 is supplied as T651, which has been stress-relief stretched after solution heat treatment. That stretch is the whole point: it removes the residual stress that would otherwise make your part warp as you machine material out of it. If you are machining, you want plate and you want the stretched temper.
| Product | Thickness range | 6061 temper | 7075 temper | Machining behavior |
|---|---|---|---|---|
| Sheet | Under 0.250 in | T6 | T6 | Prone to distortion, not stress relieved |
| Plate | 0.250 in and above | T651 | T651 or T7351 | Stress relieved, stable during machining |
The Thickness Ladder
Thickness availability follows a ladder that gets coarser as it gets thicker. Up to 1 inch you can generally get sixteenths and eighths. From 1 to 3 inches the standard steps are quarters. Above 3 inches you are into half-inch and then full-inch increments. Anything between the rungs is a mill order or a piece that has to be machined down from the next size up, which means you pay for the material you remove.
The thickness ladder, drawn to scale
Bar height is actual plate thickness. Note how the rungs spread out as you climb: sixteenths and eighths near the bottom, quarters in the middle, then half-inch and inch steps at the top. Between the rungs means a mill order.
| Range | Standard increment | Example thicknesses | Availability |
|---|---|---|---|
| 0.250 to 1.000 in | 1/16 and 1/8 in | 0.250, 0.313, 0.375, 0.500, 0.625, 0.750, 1.000 | Excellent |
| 1.000 to 3.000 in | 1/4 in | 1.250, 1.500, 1.750, 2.000, 2.500, 3.000 | Good |
| 3.000 to 6.000 in | 1/2 in | 3.500, 4.000, 4.500, 5.000, 6.000 | Fair |
| Above 6.000 in | 1 in | 7.000, 8.000, 10.000 | Poor, 6061 only |
What Each Alloy Is Actually Available In
The three alloys do not share the same envelope. 6061 goes the thickest because it is a commodity product produced broadly, and its quench sensitivity is low enough that heavy sections behave predictably. 7075 tops out lower because thick sections develop stress corrosion vulnerability, which is precisely the problem 7050 was invented to solve. Here is our stocked envelope in Detroit.
0.25 to 10 in
6061-T651 stocked thickness range
NOX METALS, Detroit MI
0.25 to 6 in
7075 and 7050 stocked thickness range
NOX METALS, Detroit MI
60 x 144 in
Largest standard plate footprint stocked
NOX METALS, Detroit MI
| Alloy | Tempers | Thickness range | Widths | Lengths |
|---|---|---|---|---|
| 6061 | T651 (plate), T6511 (bar) | 0.25 to 10.0 in | 48, 60 in | 96, 144 in |
| 7075 | T651, T7351 | 0.25 to 6.0 in | 48, 60 in | 96, 144 in |
| 7050 | T7451, T7651 | 0.25 to 6.0 in | 48, 60 in | 96, 144 in |
Thickness Is Where Availability Actually Breaks Down
Alloy and size both matter, but the variable that most often blows up a schedule is thickness in the 7xxx alloys. Thin and mid-gauge plate is widely stocked. Thick 7050 is a different world: fewer mills are qualified, aerospace and defense programs consume most of the output, and DPAS-rated defense orders take priority in the queue. Thick 7050 plate above 3 inches routinely runs 12 to 20 week mill lead times. If your program needs it, buy from stock or buy early.
Practical availability by alloy and thickness (10 = ships from stock today)
Cut to Size, Full Plate, or Drop
Once you know the thickness you need, you choose how much of a plate to buy. Full mill plate gives the lowest per-pound rate but commits you to hundreds or thousands of pounds. Cut-to-size means you only pay for the rectangle you need. A drop is a remnant from a previous cut, already certified and already on the floor, which is usually the cheapest and fastest option if your part fits inside one.
| Option | What you get | Rate per lb | Lead time | Best for |
|---|---|---|---|---|
| Full mill plate | Complete 48 x 144 or 60 x 144 plate | Lowest | Same day from stock | Repeat production, high volume |
| Cut to size | Any rectangle from stock plate | Higher | Same day to 2 days | One-off parts, prototypes |
| Drop or remnant | Existing certified remnant | Lowest total cost | Immediate | Any part that fits the piece |
| Mill order | Non-standard gauge or oversize | Highest | 12 to 20 weeks | Off-ladder requirements only |
Designing Around Standard Sizes
A handful of habits will keep material off your critical path.
- Round thickness to the ladder. Specify 1.500 rather than 1.375 unless the extra precision does real work. Off-ladder gauges cost weeks.
- Keep parts inside 60 inches in one direction. That is the widest standard plate. A 61 inch part turns a routine order into a specialty mill buy.
- Nest for yield before you order. Two parts that fit side by side in a 60 inch width cost far less than two parts that each need their own plate.
- Add machining allowance, then check the ladder again. If your finished dimension is 0.98 inch and you want 1.000 stock, verify the thickness tolerance leaves you enough material at the thin end of the band.
- Do not specify above 0.250 inch and then expect T6. Plate at and above 0.250 comes as T651. If a drawing calls for 6061-T6 at 1 inch, it needs correcting to T651.
- Check thickness availability before committing to an alloy. If your design needs 4 inches and the schedule is tight, 6061 at 4 inches is routine while 7050 at 4 inches may be a 16 week wait.
What to Put on the Purchase Order
A complete plate PO line removes an entire round of back-and-forth. Six fields cover it.
- Alloy and temper. 6061-T651, 7075-T651, 7075-T7351, 7050-T7451. Not just 6061.
- Thickness, width, and length, in that order, and state whether dimensions are minimum or nominal.
- Specification, if your program requires one. AMS 4027 or AMS-QQ-A-250/11 for 6061, AMS 4045 or AMS-QQ-A-250/12 for 7075-T651, AMS 4050 for 7050-T7451.
- Origin requirement. DFARS-compliant, domestic melt, or any origin. These are three different products at three different prices.
- Certification requirement. Mill certs with heat number and lot traceability, plus any ultrasonic or chemistry requirements from the spec.
- Quantity and required date, so the supplier can tell you immediately whether it is a stock pull or a mill order.
Plate exists in a defined set of shapes: three master footprints, a thickness ladder that coarsens as it thickens, and a 0.250 inch line that separates sheet from plate and T6 from T651. Design inside that set and material stops being a schedule risk. 6061 covers 0.25 to 10 inches and is available almost everywhere; 7075 and 7050 run 0.25 to 6 inches with availability tightening sharply in thick sections, especially 7050 above 3 inches. When a design does need something off-ladder, know that up front so the 12 to 20 week mill lead time lands in the plan rather than in the middle of the build.
Frequently Asked Questions
What are standard aluminum plate sizes?
Mill master plate comes in three main footprints: 48.5 x 96.5 inches, 48.5 x 144.5 inches, and 60.5 x 144.5 inches. These are usually described as 48 x 96, 48 x 144, and 60 x 144, with the extra half inch built in so buyers can trim mill edges and still hit nominal dimensions. Anything wider than 60 inches or longer than 144 inches is a specialty mill product with a long lead time.
What thicknesses does 6061 aluminum plate come in?
6061-T651 plate starts at 0.250 inch and goes up to 10 inches. The standard increments are sixteenths and eighths up to 1 inch, quarters from 1 to 3 inches, half-inch steps from 3 to 6 inches, and full-inch steps above that. Below 0.250 inch the product is sheet rather than plate, and it is supplied as T6 rather than T651.
What is the difference between aluminum sheet and plate?
Thickness, at the 0.250 inch line. Below 0.250 inch it is sheet; at 0.250 inch and above it is plate. The practical consequence is temper: 6061 sheet is supplied as T6, while 6061 plate is supplied as T651, which has been stress-relief stretched after heat treatment. That stretch removes residual stress that would otherwise cause warping during machining, which is why anyone machining parts wants plate rather than sheet.
How thick can you get 7075 and 7050 aluminum plate?
We stock both from 0.25 through 6 inches. 7075 is generally not used above 6 inches because thick sections quench unevenly, which reduces core properties and raises stress corrosion cracking risk. 7050 was specifically developed to solve that problem and is the preferred alloy above 3 inches, though availability in thick 7050 is tight and mill lead times commonly run 12 to 20 weeks.
Can I get aluminum plate cut to a custom size?
Yes. Any rectangular size can be cut from stock plate. We cut on bandsaws with a 0.08 inch kerf and ship from Detroit, typically same day to two days. Cut-to-size carries a higher per-pound rate than full mill plate but you only pay for the rectangle you need, which is usually far cheaper in total for one-off and prototype work.
What is a drop and why is it cheaper?
A drop is a remnant left over after a larger plate is cut. It is the same certified material with the same mill paperwork, it is already on the floor, and the seller is recovering value from metal that is already paid for. If your part fits inside an existing drop, it is usually the lowest total cost option available and it ships immediately, with no mill lead time at all.
Why can I not get a 1.375 inch aluminum plate?
Because it is off the standard thickness ladder. Between 1 and 3 inches, plate is rolled in quarter-inch increments, so 1.250 and 1.500 are standard while 1.375 is not. Your options are a mill order with a lead time of several months, or buying 1.500 inch and machining off 0.125 inch, which means paying for material that becomes chips. In most cases rounding the design to a ladder thickness costs nothing in function.
Is aluminum plate really 48 x 144, or is it slightly bigger?
Slightly bigger, and deliberately so. Plate sold as 48 x 144 is produced at 48.5 x 144.5 inches, and 60 x 144 is produced at 60.5 x 144.5. The overage exists so the buyer can trim mill edges and still hit nominal dimensions. Always calculate weight and yield on the actual dimensions, since on a 4 inch plate that extra half inch of width is over 30 pounds of material.
Check Availability
See what is on the floor right now.
6061, 7075, and 7050 plate in stock in Detroit, cut to any rectangle you need. Quote your exact size in under 60 seconds and see whether a drop already fits your part.