Two suppliers can quote the same 6063 profile on the same day and still promise delivery three weeks apart. Neither is lying. Lead time is not a single number that a factory either has or does not have — it is the sum of a dozen sequential stages, and only two or three of them are actually about pressing aluminium. When a buyer asks “how long”, the honest answer is a range, and the useful follow-up question is “which stage is the long pole”.
This guide breaks an extrusion order into its real stages, shows which ones compress easily and which ones cannot be hurried without cost, and explains how to read a promised delivery date so you can plan around it instead of discovering the gap at the loading dock.
Why Lead Time Is a Range, Not a Number
A standard-profile order that runs on an existing die, in a common alloy, at mill finish, can often ship in two to three weeks. The same order with a new die, a non-standard alloy, a 20 µm anodized finish and a machined mounting face is a different project with a different critical path. The metal is the same; the queue is not.
Lead time therefore has three components that behave very differently: tooling time (before any metal moves), process time (press, furnace, bath, machine) and queue time (waiting for a slot behind other orders). Buyers usually negotiate the first two and are surprised by the third. On a busy press line, queue time can be longer than process time for every stage combined.
The Clock Starts at Drawing Review, Not at the Press
Nothing is cut until the drawing is understood. A dimensioned PDF with alloy, temper, tolerance class and finish callout can be reviewed and quoted in a day or two. A sketch, or a drawing that leaves wall thickness, corner radii or the datum scheme undefined, triggers a round of questions — and each round costs calendar days, not working hours.
This stage is where lead time is most cheaply recovered. Every ambiguity resolved on paper is a die correction, a sample iteration or a sorting operation that does not happen later. If a supplier responds to a drawing with three specific questions rather than a price, that is a sign the review is real.
- Alloy and temper stated explicitly, not implied by a note.
- Critical dimensions marked, with the tolerance standard named.
- Finish specified by thickness or standard, not by a photograph.
- Quantity per order and per year given, because both change the tooling decision.
Die Fabrication and Tryout: Usually the Long Pole
For a new profile, the die is almost always the critical path. Design, electrode making, machining, heat treatment, nitriding and polishing are sequential, and most of them cannot be parallelised at small quantity. A simple solid profile in a common alloy is a shorter job than a hollow section with internal webs, thin fins or a tight wall-thickness ratio.
Then comes tryout. The first billet through a new die tells you whether the metal flows evenly, whether the fins fill, whether the section twists. A good die runs close to nominal on the first attempt; a difficult one needs correction, re-polishing and a second trial. Buyers who budget for one tryout and no correction are budgeting for the best case.
Approval of the first article is a separate clock, and it is usually the buyer’s clock. A sample that sits on a desk for a week adds a week to the delivery date, and no amount of pressing speed gets it back.
The Stages, and What Actually Compresses Each One
The table below gives indicative planning ranges for a custom profile in modest quantity. Treat them as a way to structure a conversation, not as a quotation — every stage depends on the section, the alloy, the finish and the current load on the plant.
| Stage | Indicative duration | What compresses it |
|---|---|---|
| Drawing review and DFM | 2–5 days | A complete drawing; one consolidated question round |
| Die design and fabrication | 7–15 days | Simpler section; standard alloy; earlier order placement |
| Die tryout and sample approval | 3–7 days | Fast buyer sign-off; agreed acceptance criteria up front |
| Billet and alloy procurement | 3–10 days | Common alloy in stock; larger order released earlier |
| Press scheduling and extrusion | 2–7 days | Booked slot; quantity that justifies a dedicated run |
| Heat treatment (T5 / T6) | 1–2 days | Correct temper specified; furnace batch alignment |
| Anodizing or powder coating | 3–7 days | Standard colour; thickness within a routine band |
| Machining and assembly | 3–10 days | Fewer operations; features extruded instead of cut |
| Inspection, packing, documents | 1–2 days | Inspection plan agreed before production |
| Inland haulage and ocean freight | 25–40 days | Earlier booking; consolidation; choice of port |
Billet, Alloy and Press Scheduling
Billet for 6063 in common diameters is usually available quickly. 6061, 6005A, 6082 and specialty alloys are bought or cast to order more often, and the difference shows up directly in the calendar. Specifying 6061 for a heat sink that would run perfectly well in 6063 does not only raise the billet premium — it can add a week before the press is even touched.
Press scheduling is where queue time lives. A plant running several hundred dies cannot hold an idle press for an unscheduled order. What moves an order forward is not urgency in an email but a booked slot: a confirmed order, a confirmed die, and a quantity large enough to justify a run of its own rather than a gap-filling insert between two larger jobs.
Heat Treatment: T5, T6 and Why Cooling Is on the Clock
Extruded profile leaves the press at a temperature where the alloy is still soft, and the temper is created by controlled cooling followed, for T6, by an artificial ageing cycle. T5 relies on cooling from the press and a lower-temperature age; T6 adds a solution treatment and a higher ageing temperature. The difference is not a label on a drawing — it is furnace time, and furnace time is scheduled in batches.
If your application genuinely needs T6, specify it and plan for it. If it needs T5, saying T6 “to be safe” buys nothing except a longer queue and a higher price, and can even hurt dimensional stability in thin, finned sections.
Finishing: Batches, Colours and the Cost of a Non-Standard Shade
Anodizing and powder coating run in batches, and a batch only starts when there is enough work to fill a rack economically. A standard clear anodize at a routine thickness slots into the normal cycle. A specific colour match, a very heavy build, selective masking, or a two-step finish each add a setup and often a wait for the batch to fill.
This is the stage where buyers most often lose a week without noticing. If the finish is commercially flexible, say so at the quotation stage and let the plant schedule it into the next suitable batch. If it is not flexible — a brand colour, a visible architectural face — then it belongs in the critical path from day one, not discovered after extrusion.
Machining, Assembly and Sub-Components
Every operation after extrusion adds a setup, a fixture and an inspection point, and each one can only start after the previous one finishes. Cutting to length is fast. Drilling, tapping, milling, deburring and pressing inserts are not, because they consume machine time per piece rather than per tonne.
The reliable way to shorten this stage is design, not pressure: an extruded hole instead of a drilled one, a screw boss instead of a tapped insert, a profile that self-locates instead of one that needs a jig. These decisions are free at the drawing stage and expensive after the die is cut. If sub-components from a third party are involved — fasteners, gaskets, fans, thermal interface material — their lead time is your lead time, and it should be quoted alongside the profile rather than discovered at packing.
Inspection, Packing and Export Documents
Final inspection is short if the criteria were agreed early and long if they are being negotiated at the end. A dimensional report, a hardness reading and a coating thickness check take hours; a debate about which dimension counts as critical can take days.
Export packing follows the surface. A mill-finish structural profile can travel interleaved and strapped; a brushed anodized face needs film, foam and often individual wrapping. Add crate specification, moisture protection and labelling, and the packing stage becomes a real line item rather than an afterthought. Commercial documents, certificates of origin and any destination-specific paperwork run in parallel with packing — but only if someone starts them in parallel.
Freight: The Part You Actually Control
Ocean freight is the largest single block in most delivery dates, and it is the block a supplier controls least. Sailing frequency, port congestion, booking cut-offs and consolidation all move independently of the factory. What a supplier can do is book early, confirm the sailing before the cargo is ready to move, and tell you honestly when a booking slips.
Two practical consequences. First, a delivery date quoted as “ex works” and one quoted as “delivered” are not comparable, and the gap is usually four to six weeks. Second, if your production line depends on the material, the date you should be tracking is the vessel departure, not the completion of extrusion — because everything after departure is outside anyone’s ability to compress.
How to Compress a Schedule Without Paying Twice
- Place the order against a complete drawing. The cheapest days saved are the ones lost to clarification rounds.
- Approve the first article within 48 hours. Buyer-side delay is the most common invisible cost in a project schedule.
- Book the press slot with the order, not after the sample. Where the risk is acceptable, extrusion capacity can be reserved while the sample is in transit.
- Keep the finish standard unless the market demands otherwise. A stock colour can save a week; a brand match is worth that week only if the product needs it.
- Ask for the critical path, not just a number. A supplier who can name the long pole is a supplier who can tell you what a change would cost in days.
What does not work is paying for air freight to recover a week that was lost to a missing dimension in month one. Expediting is expensive precisely because it only compresses the stages that were already fast.
What to Send for a Realistic Delivery Date
Send the drawing with alloy and temper, the tolerance standard, the finish specification with thickness, the quantity per order and per year, and the destination port. With those five items a supplier can name the critical path and give you a date you can plan a production launch around — rather than an optimistic figure that has to be revised twice.
If you are still at the design stage, send the section and the application instead. It is far cheaper to change a wall thickness or a corner radius on paper than to correct a die, and it is the single decision that most reliably shortens the calendar.
Send your drawing or target specification to our team — we reply with a quote, a die feasibility assessment and an indicative schedule within 24 hours.