Aluminum TK Ultra 7 · other
Aluminum TK Ultra 7-STD
Properties of the STD condition, compared with the other TK Ultra 7 tempers.
Default stocked condition: machined/skimmed precision plate with very low residual stress for distortion-free large-area milling.
What is TK Ultra 7-STD?
TK Ultra 7-STD is TK Ultra 7 in the STD condition — default stocked condition: machined/skimmed precision plate with very low residual stress for distortion-free large-area milling. TK Ultra 7-STD has a yield strength of 320 MPa (46.4 ksi) and a tensile strength of 370 MPa (53.7 ksi) — stronger than 80% of aluminum grades. Elongation at break is 5% and the elastic modulus is 71 GPa (10.3 Msi). TK Ultra 7-STD has a density of 2.82 g/cm³ (0.102 lb/in³), heavier than 89% of aluminum grades. It melts at 475°C (887 °F).
Advantages
- Easy to machine — 88/100, better than 96% of aluminum grades
- Polishes to a fine finish — 70/100, better than 87% of aluminum grades
- High strength — 320 MPa (46.4 ksi), better than 80% of aluminum grades
Limitations
- Difficult to weld — 20/100, worse than 89% of aluminum grades
- Limited service temperature — 120°C (248 °F), worse than 79% of aluminum grades
TK Ultra 7-STD properties
Typical room-temperature values for TK Ultra 7-STD — 11 properties are specific to this condition; the rest are grade-level values shared by every TK Ultra 7 temper. Each bar shows where the value sits among the aluminum grades in FabDigit's library — further right is higher.
Physical3
TK Ultra 7-STD has a density of 2.82 g/cm³ (0.102 lb/in³), heavier than 89% of aluminum grades. It melts at 475°C (887 °F).
Mechanical14
TK Ultra 7-STD has a yield strength of 320 MPa (46.4 ksi) and a tensile strength of 370 MPa (53.7 ksi) — stronger than 80% of aluminum grades. Elongation at break is 5% and the elastic modulus is 71 GPa (10.3 Msi).
Thermal6
TK Ultra 7-STD is rated for continuous service to 120°C (248 °F). It conducts heat at 150 W/m·K (86.7 BTU/hr·ft·°F), better than 58% of aluminum grades. Thermal expansion is 23.4 µm/m·K (13 µin/in·°F).
Electrical3
TK Ultra 7-STD conducts electricity at 33 % IACS, worse than 57% of aluminum grades.
Chemical & Environmental3
Corrosion resistance is fair (45/100), worse than 62% of aluminum grades.
Sustainability4
Producing a kilogram of TK Ultra 7-STD takes about 200 MJ of energy and emits 12 kg of CO₂ — less than 60% of aluminum grades. Typical recycled content is 25%.
Manufacturability8
TK Ultra 7-STD's machinability is excellent (88/100, better than 96% of aluminum grades); weldability poor (20/100); formability poor (15/100).
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Working with TK Ultra 7-STD
Is TK Ultra 7 easy to machine?
Excellent — high cutting speeds with polished-flute carbide, short chips, low distortion thanks to the stress-relieved plate; typical Ra <0.4 µm achievable on finish passes.
Can TK Ultra 7 be welded?
Not recommended for structural joints — Cu/Zn-bearing 7xxx is hot-crack prone; use mechanical fastening, or FSW/laser repair only with qualified procedures.
Can TK Ultra 7 be formed, bent or molded?
Supplied for machining, not forming — very limited cold bending; any hot forming above ~150 °C will over-age and soften the plate.
What surface finishes work on TK Ultra 7?
Hard anodize for wear surfaces, chemical conversion coating or paint for corrosion protection; decorative anodizing tends to a grey, non-uniform shade — bead blasting or polishing before coating gives the best cosmetics.
TK Ultra 7 chemical composition (wt %)
Limits by weight percent from the governing specification, written the way the spec states them — a single maximum for impurities, a range for alloying elements, and the base element as balance. Nominal is the typical mid-range value.
| Element | Spec limit (wt %) | Nominal |
|---|---|---|
| Znprincipal hardening element (AlZnMgCu family) | 4.5 – 6.5 | 5.6 |
| Mg | 1 – 2.5 | 1.8 |
| Curaises strength, lowers corrosion resistance | 0.3 – 1.6 | 0.8 |
| Mn | 0 – 0.5 | 0.15 |
| Crgrain-structure control | 0 – 0.3 | 0.1 |
| Zroptional dispersoid former | 0 – 0.25 | 0.1 |
| Tigrain refiner | 0 – 0.2 | 0.03 |
| Feimpurity | 0 – 0.5 | 0.2 |
| Siimpurity | 0 – 0.4 | 0.1 |
| Al | balance | — |
TK Ultra 7-STD — frequently asked
What is TK Ultra 7-STD used for?
TK Ultra 7-STD is typically used for injection mold cavities, cores and inserts, blow mold tooling, thermoforming and vacuum forming molds, precision fixture and jig plates, machine base and mounting plates and prototype and short-run mold tooling. In short: ultra-hard mold plate; steel-like.
What is the yield strength of TK Ultra 7-STD?
TK Ultra 7-STD has a typical yield strength of 320 MPa (46.4 ksi) and a tensile strength of 370 MPa (53.7 ksi) — stronger than 80% of aluminum grades.
Is TK Ultra 7-STD easy to machine?
Yes — machinability is rated excellent (88/100, better than 96% of aluminum grades). Excellent — high cutting speeds with polished-flute carbide, short chips, low distortion thanks to the stress-relieved plate; typical Ra <0.4 µm achievable on finish passes.
Can TK Ultra 7-STD be welded?
Not readily — weldability is rated poor (20/100). Not recommended for structural joints — Cu/Zn-bearing 7xxx is hot-crack prone; use mechanical fastening, or FSW/laser repair only with qualified procedures.
What surface finishes work on TK Ultra 7-STD?
Hard anodize for wear surfaces, chemical conversion coating or paint for corrosion protection; decorative anodizing tends to a grey, non-uniform shade — bead blasting or polishing before coating gives the best cosmetics.
Can TK Ultra 7-STD be formed, bent or molded?
Supplied for machining, not forming — very limited cold bending; any hot forming above ~150 °C will over-age and soften the plate.
What is the maximum service temperature of TK Ultra 7-STD?
TK Ultra 7-STD is rated for continuous use to about 120°C (248 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
Can FabDigit make parts in TK Ultra 7-STD?
Yes — TK Ultra 7-STD is available for CNC machining with instant online pricing. Upload a STEP file to get a price and a DFM check.
Sources
- High-strength cast AlZnMgCu precision/tooling plate datasheets (G.AL C-series class products) — European aluminium plate producers (2023)
- ASM Handbook Vol.2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
- ASM Handbook Vol.16 — Machining — ASM International (1989)
- EN 485-2 / EN 573-3 (7xxx wrought aluminium plate properties and composition limits, used as analogue) — CEN (2019)
- MMPDS-18 typical 7xxx thick-plate property data — Battelle/FAA (2023)
Property data is compiled from published supplier and standards handbooks and normalised for comparison. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.