Aluminum 851.0-F (As fabricated)
Temper
AA 851.0 · UNS A08510
As-cast condition, used when bearing shells are machined immediately and no dimensional stabilization is required.
Values for the F condition
Other 851.0 tempers and conditions
851.0 is listed in 3 conditions; see the grade overview at 851.0.
Compare all 3 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
FThis page As fabricated | As-cast condition, used when bearing shells are machined immediately and no dimensional stabilization is required. | 62 | 125 | 8 | 40 HB | 44 % IACS |
T5Default Cooled from hot working and artificially aged | Standard supply condition for 851.0 bearing castings — stabilizes dimensions and raises yield strength without a separate solution treatment. | 76 | 140 | 5 | 45 HB | 45 % IACS |
Solution heat treated and artificially aged | Choose when the highest load capacity and yield strength are needed from 851.0, at the cost of some ductility and extra heat-treat cost. | 90 | 150 | 4 | 50 HB | 42 % IACS |
What is 851.0-F?
851.0-F is 851.0 in the F temper — as-cast condition, used when bearing shells are machined immediately and no dimensional stabilization is required. 851.0-F has a yield strength of 62 MPa (8.99 ksi) and a tensile strength of 125 MPa (18.1 ksi) — weaker than 93% of aluminum grades. Elongation at break is 8% and the elastic modulus is 71 GPa (10.3 Msi). 851.0-F has a density of 2.83 g/cm³ (0.102 lb/in³), heavier than 91% of aluminum grades. It melts at 227°C (441 °F). T5 is the default condition FabDigit quotes; F is available on request or by drawing note.
Advantages
- Easy to machine — 88/100, better than 96% of aluminum grades
- High electrical conductivity — 44 % IACS, better than 85% of aluminum grades
Limitations
- Low strength — 62 MPa (8.99 ksi), worse than 93% of aluminum grades
- Difficult to weld — 20/100, worse than 89% of aluminum grades
851.0-F properties
Typical room-temperature values for 851.0-F; 19 are specific to this condition. Other listed values are 851.0 reference data and may not represent this condition. Bars are the position among aluminum grades.
Physical3
851.0-F has a density of 2.83 g/cm³ (0.102 lb/in³), heavier than 91% of aluminum grades. It melts at 227°C (441 °F).
Mechanical12
851.0-F has a yield strength of 62 MPa (8.99 ksi) and a tensile strength of 125 MPa (18.1 ksi) — weaker than 93% of aluminum grades. Elongation at break is 8% and the elastic modulus is 71 GPa (10.3 Msi).
Thermal6
851.0-F is rated for continuous service to 130°C (266 °F). It conducts heat at 150 W/m·K (86.7 BTU/hr·ft·°F), better than 58% of aluminum grades. Thermal expansion is 22.9 µm/m·K (12.7 µin/in·°F).
Electrical3
851.0-F conducts electricity at 44 % IACS, better than 85% of aluminum grades.
Chemical & Environmental3
Corrosion resistance is fair (45/100), worse than 62% of aluminum grades.
Sustainability4
Producing a kilogram of 851.0-F takes about 180 MJ of energy and emits 12 kg of CO₂ — less than 91% of aluminum grades. Typical recycled content is 40%.
Manufacturability8
851.0-F's machinability is excellent (88/100, better than 96% of aluminum grades); weldability poor (20/100); formability poor (18/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with 851.0-F
Is 851.0 easy to machine?
Very free-cutting: soft Sn phase breaks chips; use sharp polished carbide tools, high speed, light feed and flood coolant to avoid smearing on bearing surfaces.
Can 851.0 be welded?
Essentially unweldable by fusion methods — tin promotes severe hot cracking; repair by mechanical means or replace the casting.
Can 851.0 be formed, bent or molded?
Permanent-mold (gravity die) and sand casting both practical; avoid slow cooling that coarsens the tin network, and pour clean, degassed metal to keep bearing surface porosity low.
What surface finishes work on 851.0?
Machine and hone to final size; anodizing is not recommended, chemical conversion or tin/lead overlay plating is used, and bores may be bonded to steel backing strip.
851.0 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 | 6.25 |
| Si | 2 – 3 | 2.5 |
| Cu | 0.7 – 1.3 | 1 |
| Niload-carrying intermetallics | 0.3 – 0.7 | 0.5 |
| Fe | ≤ 0.7 | — |
| Mn | ≤ 0.1 | — |
| Mg | ≤ 0.1 | — |
| Ti | ≤ 0.2 | — |
| Others (each)each | ≤ 0.05 | — |
| Others (total)total | ≤ 0.3 | — |
| Al | balance | — |
851.0-F — frequently asked
What is 851.0-F used for?
851.0-F is typically used for heavy-duty plain bearings, bushings, bearing shells, diesel and industrial engine bearings, gearbox and pump journal bearings and steel-backed bearing liners. In short: higher-load 850.0 variant; free-cutting bearing alloy; nickel-modified tin structure.
What is the yield strength of 851.0-F?
851.0-F has a typical yield strength of 62 MPa (8.99 ksi) and a tensile strength of 125 MPa (18.1 ksi) — weaker than 93% of aluminum grades. Strength varies by condition: see the 3 listed tempers.
Is 851.0-F easy to machine?
Yes — machinability is rated excellent (88/100, better than 96% of aluminum grades). Very free-cutting: soft Sn phase breaks chips; use sharp polished carbide tools, high speed, light feed and flood coolant to avoid smearing on bearing surfaces.
Can 851.0-F be welded?
Not readily — weldability is rated poor (20/100). Essentially unweldable by fusion methods — tin promotes severe hot cracking; repair by mechanical means or replace the casting.
What surface finishes work on 851.0-F?
Machine and hone to final size; anodizing is not recommended, chemical conversion or tin/lead overlay plating is used, and bores may be bonded to steel backing strip.
Can 851.0-F be formed, bent or molded?
Permanent-mold (gravity die) and sand casting both practical; avoid slow cooling that coarsens the tin network, and pour clean, degassed metal to keep bearing surface porosity low.
What is the maximum service temperature of 851.0-F?
851.0-F is rated for continuous use to about 130°C (266 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between 851.0-T5 and 851.0-F?
T5 is the default condition — standard supply condition for 851.0 bearing castings — stabilizes dimensions and raises yield strength without a separate solution treatment. F: as-cast condition, used when bearing shells are machined immediately and no dimensional stabilization is required. Yield strength is 76 MPa in T5 versus 62 MPa in F.
Sources
- ANSI H35.1 / AA Registration Record of Aluminum Association Alloy Designations and Chemical Composition Limits for Aluminum Alloys in the Form of Castings and Ingot ('Pink Sheets') — The Aluminum Association (2018)
- ASTM B26/B26M Standard Specification for Aluminum-Alloy Sand Castings; ASTM B108 Permanent Mold Castings — ASTM International (2018)
- ASM Handbook Vol. 2: Properties and Selection — Nonferrous Alloys and Special-Purpose Materials (aluminum bearing alloys 850.0/851.0/852.0) — ASM International (1990)
- ASM Specialty Handbook: Aluminum and Aluminum Alloys — ASM International (1993)
- MatWeb material property data — Aluminum 851.0-T5 / T6 — MatWeb LLC (2024)
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.