Heat Resistant AL · 4xxx
Aluminum 4145
Aluminum 4145 is a heat resistant aluminum — cu-si filler for cast aluminum welding. Typical values: 80 MPa yield, 2.74 g/cm³, rated to 200 °C. Available for CNC machining, Sheet metal at FabDigit.
Properties
Typical room-temperature values for the default supply condition. Metric first, imperial in gray. The bars show where 4145 sits against the other 163 aluminum grades in the catalog.
Datasheet
| Yield strength | 80 MPa12 ksi |
|---|---|
| Tensile strength | 200 MPa29 ksi |
| Hardness | 60 HB |
| Density | 2.74 g/cm³0.099 lb/in³ |
| Specific strength (yield ÷ density) | 29 |
| Min service temp | -200 °C-328 °F |
| Max service temp | 200 °C392 °F |
| Electrical conductivity | 40 % IACS23.2 MS/m |
| Machinability | Fair45 / 100 |
| Weldability | Excellent95 / 100 |
| Formability | Very good70 / 100 |
| ISO 513 machining group | N |
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Against other aluminum grades
Strength versus weight in the aluminum family
Yield strength against density for every aluminum grade FabDigit runs. 4145 is highlighted; hover a dot for its name, or open the interactive family chart.
Manufacturability
The process limits FabDigit's quote engine applies to 4145. Design inside these and the part quotes instantly; outside them it routes to an engineer.
CNC machining
| Machinability | Good45 / 100 |
|---|---|
| ISO material group | N.1 |
| Cutting speed (rough / finish) | 350 / 420 m/min |
| Minimum wall | 0.5 mm |
| Minimum internal radius | 1 mm |
| Drill depth limit | 8× diameter |
| Best surface (machined / polished) | Ra 0.8 / — |
| Hardenable after machining | No |
Sheet metal
| Formability | Better70 / 100 |
|---|---|
| Weldability | Excellent95 / 100 |
Conditions and tempers
How 4145 is supplied and what each state is for. The default is what FabDigit quotes unless your drawing says otherwise.
| Condition | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness |
|---|---|---|---|---|---|
T6 Solution heat treated, artificially aged (T6) | Heavy load-bearing frames, high-stress parts, precision components | — | — | — | — |
Heat treatment and post-processing
Operations FabDigit's suppliers routinely run on 4145, ranked by how often they make sense for this grade.
Heat treatment
| Age T6 (Aluminum) | Solution + artificial age to peak strength |
|---|---|
| Age T651 (Aluminum) | T6 + stress relief stretch (plate) |
| Full Anneal | Restore ductility; relieve residual stress; coarsen grain |
| Stress Relief | Reduce residual stress without changing structure |
| Age T73 (Aluminum) | Over-age 7000 for SCC resistance |
Post-processing
| Manual Deburr | Deburrstandard |
|---|---|
| Edge Break (0.5mm) | Deburr |
| Glass Bead Blast | Blast |
| Laser Mark | Marking |
| Sand Blast | Blast |
| Vibratory Tumble | Tumble |
| CMM Inspection | Inspection |
| Masking | Masking |
| Tap After Finish | Finish Fix |
| FAI Report | Inspection |
Surface finishes for 4145
Coatings and treatments compatible with aluminum on the processes 4145 runs on. Pick them in the quote configurator or call them out on the drawing.
Passivation
- Electropolishing
Conversion Coating
- Anodizing Type II
- Chem Film (Alodine)
- Hard Anodize Type III w/ PTFE
- Hard Anodizing Type III
Plating
- Electroless Nickel (EN)
- Gold Plating
- Nickel Plating
- Silver Plating
Organic Coating
- Cerakote
- E-Coating
- Epoxy Coating
- Painting
- Powder Coating
- PTFE Coating
PVD Coating
- DLC
Marking / Decoration
- Chemical Etching
- Dot Peen Marking
- Electro-chemical Etching
- Embossing / Debossing
- Ink Stamping
- Laser Marking
- Mechanical Engraving
- Steel Stamping
- Vibro Engraving / Scribing
Equivalent designations
Standards and trade names that resolve to Aluminum 4145 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- Aluminum Association
- AA4145
- EN / DIN / Werkstoff-Nr.
- AW-4145AW 4145
- Other
- AW4145
Stock forms
Raw-material forms FabDigit sources 4145 in.
Property data is compiled from published supplier and standards handbooks and normalised for comparison; hardness values on non-Brinell scales are converted approximately for charting only. Manufacturability limits are FabDigit quote-engine defaults and may be relaxed by engineering review. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.