Aluminum 850.0-T5
Temper · default condition
AA 850.0 · UNS A08500
T5 = cooled from hot working and artificially aged
Standard supply condition for sand-cast bearing shells and bushings; best dimensional stability in service.
Values for the T5 condition
Other 850.0 tempers and conditions
850.0 is listed in 4 conditions; see the grade overview at 850.0.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
As fabricated | Use for non-critical bushings where the dimensional stabilization of T5 is not required. | 65 | 130 | 10 | 42 HB | 47 % IACS |
T5DefaultThis page Cooled from hot working and artificially aged | Standard supply condition for sand-cast bearing shells and bushings; best dimensional stability in service. | 76 | 138 | 10 | 45 HB | 47 % IACS |
T5 | Choose for higher-volume, thinner-wall bearing parts; finer structure gives slightly higher strength than sand casting. | 76 | 160 | 10 | 45 HB | 47 % IACS |
Permanent-mold cast, partially solution treated and stabilized | Alternative permanent-mold treatment giving somewhat higher strength with slightly lower ductility than T5. | 83 | 160 | 8 | 48 HB | 45 % IACS |
What is 850.0-T5?
850.0-T5 is 850.0 in the T5 temper — standard supply condition for sand-cast bearing shells and bushings; best dimensional stability in service. 850.0-T5 has a yield strength of 76 MPa (11 ksi) and a tensile strength of 138 MPa (20 ksi) — weaker than 90% of aluminum grades. Elongation at break is 10% and the elastic modulus is 71 GPa (10.3 Msi). 850.0-T5 has a density of 2.88 g/cm³ (0.104 lb/in³), heavier than 97% of aluminum grades. It melts at 225°C (437 °F).
Advantages
- Easy to machine — 88/100, better than 96% of aluminum grades
- Conducts heat well — 209 W/m·K (120.8 BTU/hr·ft·°F), better than 93% of aluminum grades
- High electrical conductivity — 47 % IACS, better than 88% of aluminum grades
Limitations
- Low strength — 76 MPa (11 ksi), worse than 90% of aluminum grades
- Difficult to weld — 20/100, worse than 89% of aluminum grades
- Hard to polish — 45/100, worse than 76% of aluminum grades
850.0-T5 properties
Typical room-temperature values for 850.0-T5; 10 are specific to this condition. Other listed values are 850.0 reference data and may not represent this condition. Bars are the position among aluminum grades.
Physical3
850.0-T5 has a density of 2.88 g/cm³ (0.104 lb/in³), heavier than 97% of aluminum grades. It melts at 225°C (437 °F).
Mechanical11
850.0-T5 has a yield strength of 76 MPa (11 ksi) and a tensile strength of 138 MPa (20 ksi) — weaker than 90% of aluminum grades. Elongation at break is 10% and the elastic modulus is 71 GPa (10.3 Msi).
Thermal6
850.0-T5 is rated for continuous service to 150°C (302 °F). It conducts heat at 209 W/m·K (120.8 BTU/hr·ft·°F), better than 93% of aluminum grades. Thermal expansion is 23 µm/m·K (12.8 µin/in·°F).
Electrical3
850.0-T5 conducts electricity at 47 % IACS, better than 88% of aluminum grades.
Chemical & Environmental3
Corrosion resistance is fair (50/100), worse than 56% of aluminum grades.
Sustainability4
Producing a kilogram of 850.0-T5 takes about 190 MJ of energy and emits 11.5 kg of CO₂ — less than 89% of aluminum grades. Typical recycled content is 30%.
Manufacturability7
850.0-T5's machinability is excellent (88/100, better than 96% of aluminum grades); weldability poor (20/100); formability poor (15/100).
Common Calculations5
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with 850.0-T5
Is 850.0 easy to machine?
Very free-machining: the tin phase lubricates the cut, but use sharp tools, high speed, low feed and light finishing passes to avoid smearing soft tin over the bearing surface.
Can 850.0 be welded?
Essentially unweldable by fusion methods — the low-melting tin phase causes severe hot cracking and porosity; repair by re-casting or mechanical replacement.
Can 850.0 be formed, bent or molded?
Foundry alloy only (sand and permanent mold); control pouring temperature and use rapid solidification to keep tin finely dispersed and avoid gravity segregation in thick sections.
What surface finishes work on 850.0?
Leave as bored/burnished for bearing duty; anodizing is poor because of the tin phase, so protect non-bearing faces with chromate/paint, and tin or lead-tin flash can be applied for run-in.
850.0 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 |
|---|---|---|
| Snsoft bearing phase | 5.5 – 7 | 6.2 |
| Cu | 0.7 – 1.3 | 1 |
| Ni | 0.7 – 1.3 | 1 |
| Si | ≤ 0.7 | — |
| Fe | ≤ 0.7 | — |
| Mn | ≤ 0.1 | — |
| Mg | ≤ 0.1 | — |
| Ti | ≤ 0.2 | — |
| Others (total)others total per AA registration | ≤ 0.3 | — |
| Al | balance | — |
850.0-T5 — frequently asked
What is 850.0-T5 used for?
850.0-T5 is typically used for engine bearings, bushings and bearing shells. In short: cast aluminum bearing alloy; high embeddability and lubricity; not fusion weldable.
What is the yield strength of 850.0-T5?
850.0-T5 has a typical yield strength of 76 MPa (11 ksi) and a tensile strength of 138 MPa (20 ksi) — weaker than 90% of aluminum grades. Strength varies by condition: see the 4 listed tempers.
Is 850.0-T5 easy to machine?
Yes — machinability is rated excellent (88/100, better than 96% of aluminum grades). Very free-machining: the tin phase lubricates the cut, but use sharp tools, high speed, low feed and light finishing passes to avoid smearing soft tin over the bearing surface.
Can 850.0-T5 be welded?
Not readily — weldability is rated poor (20/100). Essentially unweldable by fusion methods — the low-melting tin phase causes severe hot cracking and porosity; repair by re-casting or mechanical replacement.
What surface finishes work on 850.0-T5?
Leave as bored/burnished for bearing duty; anodizing is poor because of the tin phase, so protect non-bearing faces with chromate/paint, and tin or lead-tin flash can be applied for run-in.
Can 850.0-T5 be formed, bent or molded?
Foundry alloy only (sand and permanent mold); control pouring temperature and use rapid solidification to keep tin finely dispersed and avoid gravity segregation in thick sections.
What is the maximum service temperature of 850.0-T5?
850.0-T5 is rated for continuous use to about 150°C (302 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between 850.0-T5 and 850.0-F?
T5 is the default condition — standard supply condition for sand-cast bearing shells and bushings; best dimensional stability in service. F: use for non-critical bushings where the dimensional stabilization of T5 is not required. Yield strength is 76 MPa in T5 versus 65 MPa in F.
Sources
- Designations and Chemical Composition Limits for Aluminum Alloys in the Form of Castings and Ingot (Pink Sheets) — The Aluminum Association (2018)
- ASTM B26/B26M — Aluminum-Alloy Sand Castings — ASTM International (2018)
- ASTM B108/B108M — Aluminum-Alloy Permanent Mold Castings — ASTM International (2019)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys and Special-Purpose Materials — ASM International (1990)
- ASM Specialty Handbook: Aluminum and Aluminum Alloys — ASM International (1993)
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.