Estimating & Cost · August 2026
What Actually Drives the Price of a Sheet Metal Part
A quote comes back higher than you expected. The instinct is to look at the material — steel is a commodity, the price per pound is public, and the math does not seem to support the number.
Material is rarely the problem. On most of the parts we quote, raw material is a minority of the price. The rest is time — time on the laser, time at the press brake, time at a bench setting hardware, time sitting on a rack waiting for a coater to fill a batch.
Here is what is actually inside the number, in the order your part moves through the shop.
Driver One
Material: You Pay for the Sheet, Not the Part
Material cost is not the weight of your finished part. It is the share of a full sheet your part consumes once it has been nested.
We buy in standard sizes — 48 x 96, 48 x 120, 60 x 120. Your parts get nested onto those sheets in the tightest arrangement the geometry allows, and what is left over is skeleton. The skeleton is scrap. It is on your quote.
This is why a fraction of an inch can change a price. A part 11.7 inches wide nests four across a 48-inch sheet with room for kerf and edge clearance. At 12.1 inches only three fit, and a quarter of that sheet’s yield disappears. Nothing about the part got harder to make. It just stopped fitting.
If you have any flexibility on an outside dimension, say so on the RFQ. On a high-volume part, a tenth of an inch is sometimes worth more than every other cost reduction on the print combined.
Grain direction works the same way. If a bend has to run across the grain, or the material carries a directional finish, we lose the freedom to rotate parts inside the nest — and yield drops with it.
Driver Two
Setup Is Fixed. Run Time Is Not.
Every operation in a fabrication shop runs on two clocks. One runs once. One runs per piece.
Setup is the clock that runs once — developing the flat pattern, writing and proving the program, loading material, changing punch tooling, setting the press brake with the right punch, die, and back gauge positions, then running and inspecting a first article. That time is identical whether the order is five pieces or five hundred.
Run time is the clock that runs per piece — the actual cutting, the actual forming.
On a small order, setup dominates. Most of what you are paying for is not your parts. It is the shop stopping what it was doing, configuring itself around your job, proving the configuration is right, and then configuring itself back. That is the honest reason a five-piece order does not cost one-tenth of a fifty-piece order.
It is also why a repeat order should be cheaper than the first one. The flat pattern is developed. The program exists. The setup is documented. If a repeat quote comes back at the same number as the original, ask why.
Driver Three
Every Bend Is a Handling Operation
The bend itself takes about a second. Everything around it does not.
At the press brake, an operator picks up the blank, locates it against the back gauge, forms it, and sets it down — for every bend, on every piece. A two-bend part and a ten-bend part do not differ by eight seconds. They differ by eight handling cycles per piece, plus whatever additional setup the extra bends demand.
Bend count is one of the most reliable predictors of forming cost on a part, and one of the easiest things to reduce while the design is still open.
Three Things at the Brake That Cost More Than People Expect
Tooling changes. A bend that can be formed with a tool already in the machine is cheap. A bend that requires stopping to change tooling is not.
Two-person parts. Once a part is large enough or awkward enough that it takes two operators to form safely, forming cost doubles per piece and nothing on the drawing shows why.
Non-standard inside radii. A radius callout that does not match standard tooling forces a special setup, and it changes the flat pattern along with it.
Driver Four
Tolerances Buy Process, Not Precision
A tolerance is not a preference. It is an instruction about which process we are allowed to use.
Sheet metal is a forming process, and forming carries inherent variation. Material thickness moves within its own mill spec. Springback moves with grain direction and with heat lot. A dimension that spans two bends carries the accumulated variation of both.
When a print calls out a tight tolerance on a formed dimension, we cannot simply be more careful. We have to change how the part is built — a different bend sequence, more frequent in-process checks, a dedicated fixture, sometimes a machining operation after forming to pull a feature into spec. Every one of those is real time on a real machine.
The expensive version is the blanket title-block note — a few thousandths applied to every dimension on the drawing, including the dozens that do not matter. It forces us to quote as though every feature is critical, because contractually it is.
Tolerance the features that are functional. Open up the ones that are not. Our standard fabrication tolerances are published so you can see exactly what comes at no premium.
Driver Five
Hardware, Welding, and the Operations in Between
Cutting and forming are the operations customers picture. They are frequently not the ones that decide the price.
Pressed hardware. Every standoff, stud, and nut is an individual insertion — located, oriented correctly, pressed, verified. Twelve inserts on a part is twelve operations per piece, and the wrong-side installs are the ones that come back.
Welding. The arc time is the small part. Fixturing, tacking, sequencing to control distortion, straightening afterward, and grinding welds to a cosmetic finish are the large part. A weld called out as ground flush and blended is a different part than the same weld left as-welded.
Deburring and edge prep. Flat parts run through a deburring machine efficiently. Formed parts, interior corners, and parts with a specified edge break come back to a bench and get handled one at a time.
Inspection and documentation. A first article report, a material certification package, or source inspection is legitimate work. It belongs on the quote, and it should be visible rather than buried.
Driver Six
Finishing Has Minimums, and Masking Has a Clock
Finishing surprises people more than any other line on a quote, because it does not scale the way the rest of the part does.
Powder coat runs in batches. A batch has a minimum charge and a color change has a cost, so five small parts in a custom color can carry nearly the same finishing charge as fifty. Plating and anodize work on racking, which means the driver is how many parts fit on a rack, not what they weigh.
Then there is masking. Every threaded hole that must stay clear, every ground point that must stay conductive, every surface that has to remain bare gets masked by hand before finishing and unmasked after. On a part with a dozen masked features, that can exceed the cost of the coating itself.
Finishing is also the longest lead time on most jobs, because it is the operation we do not fully control. If a delivery date is tight, the finish specification is usually the first thing to look at. Our finishing comparison covers the tradeoffs between processes in detail.
Driver Seven
Quantity: The Curve Is Not a Line
Price per piece falls as quantity rises, but it does not fall smoothly, and it does not fall forever.
The steepest part of the curve is at the beginning, where fixed setup gets divided across more pieces. Going from five parts to fifty usually produces a dramatic drop in unit price. Going from five hundred to a thousand produces a much smaller one, because by then setup has been amortized down to noise and you are paying mostly for material and run time — neither of which gets cheaper per piece.
Two things bend the curve in your favor beyond that point. Full-sheet quantities, where the order lines up with sheets we can nest completely instead of leaving a partial sheet behind. And blanket orders, where we build the full quantity on one setup and release it against your schedule, so you get volume pricing without carrying the inventory.
If you know your annual usage, put it on the RFQ even when you only need a first release. It changes how the job gets planned.
The Short Version
What Moves the Number Most
If you change one thing before your next RFQ, change the quantity you ask us to quote — or ask for a price break at a higher one. Setup amortization moves unit price further than any other single lever.
After that, in rough order of impact: bend count, blanket tolerances that should be selective, masked features in the finish, pressed hardware count, and outside dimensions that fall just past a clean nest.
None of that requires you to redesign your part. It requires the fabricator to see it before the design is frozen. When we look at a model early, most of these are ten-minute conversations. After release, they are change orders.
Our companion guide, Sheet Metal Design for Manufacturability, covers the design-side changes that address each of these directly.
Send Us the Model
Get a Quote That Shows Its Work
MJM Manufacturing has been fabricating precision sheet metal in South Florida since 1979. Send a STEP file or a drawing and we will tell you what is driving the price on your part — and what would change it.
MJM Manufacturing, Inc. · 5205 NW 161 Street, Miami Gardens, FL 33014 · (305) 620-2020 · sales@mjmmfg.com