Conversion cost on a standard 4040 T-slot sits at $430/ton (about $0.43/kg) for extrusion plus T5 heat treatment, climbing to $460/ton ($0.46/kg) for T6 temper on the same profile [S4].
For a heavier or more complex section, the per-kg processing line can absorb 15–40% in additional machining and tool wear, so total delivered price spreads from $2.50/kg on standard architectural profiles to $3.80/kg on intricate industrial shapes [S1][S2].
What drives conversion cost by profile complexity
Profile complexity moves three independent cost lines: die build, press tonnage required, and the per-meter run rate off the press [S2][S3].
On a simple, symmetrical shape with a circumscribing circle diameter (CCD) under 10 inches, die tooling ranges $400 to $1,000 and lead time runs 3–4 weeks; oversized profiles needing 2,000–4,000 ton presses push dies to $2,000 or more, and the press pool capable of running them is narrower [S5].
Light, thin-wall sections hit conversion cost from the opposite direction: a thin-wall profile that yields 1 ton in the same shift where a heavy-wall profile yields 3 tons effectively triples the per-kg processing charge for that run [S3]. For a wider view of how these per-kg lines stack against raw ingot, see the aluminum extrusion price index 2026 reference.
Simple vs standard vs complex profile: cost criteria compared
Standard architectural shapes (6063, symmetrical, T5) anchor the low end at roughly $0.43/kg conversion plus $0.15/kg clear anodizing on a $3.10/kg ingot base, totalling about $3.68/kg profile cost [S4].
Standard industrial shapes (6061, T6) add about $0.03/kg for the T6 step and can absorb 10–30% material premium on the alloy side versus 6063 [S1][S4].
Complex profiles (large CCD, asymmetric, hollow with porthole die, tongue ratio above 4:1) carry the heaviest die charge ($2,000+), often need a 2,000-ton-plus press, and incur 15–40% additional processing from secondary CNC work for slots, holes, and precision cuts [S2][S5][S7].
Die geometry factors that quietly inflate tooling cost
Circumscribing circle diameter is the single biggest die-cost lever: each step up in CCD demands a larger die billet, more H13 tool steel, and a higher-tonnage press that fewer suppliers run [S4][S5].
Tongue ratio (the thinnest land versus overall die bearing length) is the next tier; high tongue ratios shorten die life, so even a low-CCD profile with a poor tongue ratio pays a recurring tooling premium per shipment [S7].
Symmetry pays back twice: symmetrical dies balance metal flow, cut die-fracture risk, and shorten sample-approval cycles, which compresses both lead time and the engineering hours billed into the order [S2][S5]. For a deeper look at how alloy choice (6063 vs 6061 vs 2024) feeds into that base ingot line, the aluminum alloy reference covers the chemistry side.
Hidden cost: secondary machining, finishing, and temper
Conversion cost does not stop at the press. T6 temper adds about $30/ton over T5 because it requires faster quench and ageing steps [S4].
Finishing scales the bill sharply: clear anodizing adds $150/ton, black anodizing $300/ton, electrophoresis $250/ton, outdoor-grade powder coating $450/ton, and wood-grain transfer ranges $900–$1,150/ton depending on indoor or outdoor grade [S4].
Per-piece machining is small individually but stacks: drilling is about $0.10 per hole and 45° mitre cutting about $0.10 per cut, so a profile with 20 machined features carries roughly $2.00 of conversion cost added per piece [S4][S5].
Total cost of ownership, not just per-kg price
Specifying a complex single profile that consolidates 3–4 fabricated parts eliminates downstream joining, fixturing, and tolerance stack-up, often paying back the 15–40% conversion premium within one production run [S2][S6].
Conversely, splitting one complex die into two simple dies with a snap-fit or T-slot joint cuts die cost, opens the order to more presses, and shortens lead time when volume is low [S5].
Buyers comparing quotes should normalise on per-meter weight, alloy, temper, finish, and machined features before negotiating price, not just headline $/kg. For related downstream spec work, see the aluminum window and door and aluminum ladder reference pages.
Who complex extrusions are, and are not, for
Complex profiles suit medium-to-high annual volumes (typically above 5–10 tonnes per part number) where the die amortises, the press bottleneck is acceptable, and the part consolidation savings beat the 15–40% conversion premium [S2][S6].
They do not suit low-volume prototyping, short-run architectural mock-ups, or applications where a stock 4040/4080 T-slot profile plus brackets will carry the load; for those, the stock profile plus standard joining hardware is consistently cheaper than a custom die [S5].
Trackable signals to watch on the next sourcing cycle: LME aluminum hovering near $2,520–$2,530/tonne (roughly $2.52–$2.53/kg) as the 2025–2026 baseline [S1], and reported die lead times stretching past 4 weeks for CCD over 10 inches as press capacity at the 2,000-ton-plus tier stays tight [S5]. For market context on where this volume is heading, see aluminum extrusion 2026 demand by end market.