Aluminum 8177-O (Annealed)
Temper · default condition
AA 8177 · UNS A98177 · EN AlFeNi
Standard condition for flexible building-wire conductor and stranded cable requiring easy bending and stable connector performance.
Values for the O condition
Other 8177 tempers and conditions
8177 is listed in 9 conditions; see the grade overview at 8177.
Compare all 9 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
ODefaultThis page Annealed | Standard condition for flexible building-wire conductor and stranded cable requiring easy bending and stable connector performance. | 38 | 95 | 28 | 23 HB | 61.8 % IACS |
As fabricated | Mill-supplied 9.5 mm redraw rod for wire drawers; no controlled mechanical properties beyond resistivity. | 55 | 105 | 22 | 25 HB | 61.5 % IACS |
Strain hardened and partially annealed, quarter hard | Back-annealed quarter-hard wire — same strength class as H12 but with better ductility and connector creep behaviour. | 85 | 110 | 15 | 27 HB | 61.6 % IACS |
Strain hardened, quarter hard | Light cold work for slightly stiffer wire while keeping high elongation for stranding. | 90 | 110 | 12 | 28 HB | 61.5 % IACS |
Strain hardened and partially annealed, half hard | Most common intermediate temper in ASTM B800 wire: half-hard strength with retained elongation for bending in boxes. | 100 | 128 | 13 | 31 HB | 61.5 % IACS |
Strain hardened, half hard | Half-hard drawn wire for solid building-wire conductors needing more stiffness and pull-out strength. | 105 | 128 | 10 | 32 HB | 61.4 % IACS |
Strain hardened and partially annealed, three-quarter hard | Stabilised three-quarter-hard wire balancing strength with residual ductility for stranding. | 120 | 148 | 9 | 36 HB | 61.3 % IACS |
Strain hardened, three-quarter hard | Higher-strength drawn wire where handling stiffness or tensile capability during pulling matters. | 125 | 148 | 7 | 37 HB | 61.2 % IACS |
Strain hardened, extra hard | Fully cold-drawn hard wire for stranded conductors and where maximum tensile strength is needed before final annealing. | 160 | 180 | 4 | 45 HB | 61 % IACS |
What is 8177-O?
8177-O is 8177 in the O temper — standard condition for flexible building-wire conductor and stranded cable requiring easy bending and stable connector performance. 8177-O has a yield strength of 38 MPa (5.51 ksi) and a tensile strength of 95 MPa (13.8 ksi) — weaker than 96% of aluminum grades. Elongation at break is 28% and the elastic modulus is 69 GPa (10 Msi). 8177-O has a density of 2.71 g/cm³ (0.0979 lb/in³), heavier than 51% of aluminum grades. It melts at 645°C (1,193 °F).
Advantages
- Conducts heat well — 232 W/m·K (134 BTU/hr·ft·°F), better than 98% of aluminum grades
- High electrical conductivity — 61.8 % IACS, better than 98% of aluminum grades
- Ductile — tolerates forming and impact — 28%, better than 96% of aluminum grades
- Forms and bends easily — 95/100, better than 96% of aluminum grades
Limitations
- Low strength — 38 MPa (5.51 ksi), worse than 96% of aluminum grades
- Difficult to machine — 28/100, worse than 94% of aluminum grades
- Limited service temperature — 90°C (194 °F), worse than 93% of aluminum grades
- Hard to polish — 45/100, worse than 76% of aluminum grades
8177-O properties
Typical room-temperature values for 8177-O; 12 are specific to this condition. Other listed values are 8177 reference data and may not represent this condition. Bars are the position among aluminum grades.
Physical3
8177-O has a density of 2.71 g/cm³ (0.0979 lb/in³), heavier than 51% of aluminum grades. It melts at 645°C (1,193 °F).
Mechanical10
8177-O has a yield strength of 38 MPa (5.51 ksi) and a tensile strength of 95 MPa (13.8 ksi) — weaker than 96% of aluminum grades. Elongation at break is 28% and the elastic modulus is 69 GPa (10 Msi).
Thermal6
8177-O is rated for continuous service to 90°C (194 °F). It conducts heat at 232 W/m·K (134 BTU/hr·ft·°F), better than 98% of aluminum grades. Thermal expansion is 23.6 µm/m·K (13.1 µin/in·°F).
Electrical3
8177-O conducts electricity at 61.8 % IACS, better than 98% of aluminum grades.
Chemical & Environmental3
Corrosion resistance is good (55/100), worse than 51% of aluminum grades.
Sustainability4
Producing a kilogram of 8177-O takes about 200 MJ of energy and emits 12 kg of CO₂ — less than 60% of aluminum grades. Typical recycled content is 25%.
Manufacturability8
8177-O's machinability is poor (28/100, worse than 94% of aluminum grades); weldability very good (80/100); formability excellent (95/100).
Common Calculations5
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with 8177-O
Is 8177 easy to machine?
Soft and gummy — use sharp polished high-rake carbide, high speed and flood coolant; rarely machined since product form is wire.
Can 8177 be welded?
Readily joined by resistance/friction and by GTAW with 1100 or 4043 filler, but electrical joints are normally made by compression or AL-rated mechanical connectors rather than welding.
Can 8177 be formed, bent or molded?
Excellent cold drawability from continuous-cast rod down to fine wire; interanneal to restore ductility, and use O/H2x tempers where tight bending in junction boxes is required.
What surface finishes work on 8177?
Usually left bare under extruded PVC/XLPE insulation; if bare, oxide film gives adequate protection — anodizing is possible but Fe constituents give a grey tone, and copper-to-aluminium terminations need plated connectors plus oxide-inhibiting compound.
8177 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 |
|---|---|---|
| Si | ≤ 0.1 | 0.05 |
| Feprincipal alloying addition (Al-Fe conductor chemistry) | 0.25 – 0.45 | 0.35 |
| Cu | ≤ 0.04 | 0.02 |
| Mn | ≤ 0.01 | — |
| Mgmicro-addition for creep/relaxation resistance | 0.04 – 0.12 | 0.08 |
| Zn | ≤ 0.05 | — |
| Bboron treatment to remove Ti/V and raise conductivity | ≤ 0.04 | — |
| Others (each)each | ≤ 0.03 | — |
| Others (total)total | ≤ 0.1 | — |
| Alremainder; ≥99.4 typical | balance | — |
8177-O — frequently asked
What is 8177-O used for?
8177-O is typically used for insulated electrical wire, connector-terminated cable and building wire. In short: creep-resistant conductor alloy; 61.8% IACS with 232 W/m·K; wire-only product form.
What is the yield strength of 8177-O?
8177-O has a typical yield strength of 38 MPa (5.51 ksi) and a tensile strength of 95 MPa (13.8 ksi) — weaker than 96% of aluminum grades. Strength varies by condition: see the 9 listed tempers.
Is 8177-O easy to machine?
Not especially — machinability is rated poor (28/100, worse than 94% of aluminum grades). Soft and gummy — use sharp polished high-rake carbide, high speed and flood coolant; rarely machined since product form is wire.
Can 8177-O be welded?
Yes — weldability is rated very good (80/100). Readily joined by resistance/friction and by GTAW with 1100 or 4043 filler, but electrical joints are normally made by compression or AL-rated mechanical connectors rather than welding.
What surface finishes work on 8177-O?
Usually left bare under extruded PVC/XLPE insulation; if bare, oxide film gives adequate protection — anodizing is possible but Fe constituents give a grey tone, and copper-to-aluminium terminations need plated connectors plus oxide-inhibiting compound.
Can 8177-O be formed, bent or molded?
Excellent cold drawability from continuous-cast rod down to fine wire; interanneal to restore ductility, and use O/H2x tempers where tight bending in junction boxes is required.
What is the maximum service temperature of 8177-O?
8177-O is rated for continuous use to about 90°C (194 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between 8177-O and 8177-H19?
O is the default condition — standard condition for flexible building-wire conductor and stranded cable requiring easy bending and stable connector performance. H19: fully cold-drawn hard wire for stranded conductors and where maximum tensile strength is needed before final annealing. Yield strength is 38 MPa in O versus 160 MPa in H19.
Sources
- International Alloy Designations and Chemical Composition Limits for Wrought Aluminum (Teal Sheets) — The Aluminum Association (2018)
- ASTM B800 — 8000 Series Aluminum Alloy Wire for Electrical Purposes, Annealed and Intermediate Tempers — ASTM International (2019)
- ASTM B801 — Concentric-Lay-Stranded Conductors of 8000 Series Aluminum Alloy Wire — ASTM International (2020)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
- ASM Handbook Vol. 13B — Corrosion: Materials — ASM International (2005)
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.