Spring Cu Alloy · Phosphor Bronze
Copper Alloy C51000
Copper Alloy C51000 is a spring copper alloy — best spring-tempered bronze. Typical values: 345 MPa yield, 8.86 g/cm³, rated to 200 °C. Available for CNC machining, Sheet metal at FabDigit.
Properties
Typical room-temperature values in the O (annealed) condition. Metric first, imperial in gray. The bars show where C51000 sits against the other 36 copper alloy grades in the catalog.
Datasheet
| Yield strength | 345 MPa50 ksi |
|---|---|
| Tensile strength | 415 MPa60 ksi |
| Hardness | 80 HRB≈ 150 HB |
| Density | 8.86 g/cm³0.32 lb/in³ |
| Specific strength (yield ÷ density) | 39 |
| Min service temp | -200 °C-328 °F |
| Max service temp | 200 °C392 °F |
| Electrical conductivity | 11 % IACS6.4 MS/m |
| Machinability | Good55 / 100 |
| Weldability | Good65 / 100 |
| Formability | Very good75 / 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 copper alloy grades
Strength versus weight in the copper alloy family
Yield strength against density for every copper alloy grade FabDigit runs. C51000 is highlighted; hover a dot for its name, or open the interactive family chart.
Manufacturability
The process limits FabDigit's quote engine applies to C51000. Design inside these and the part quotes instantly; outside them it routes to an engineer.
CNC machining
| Machinability | Better55 / 100 |
|---|---|
| ISO material group | N.5 |
| Cutting speed (rough / finish) | 180 / 220 m/min |
| Minimum wall | 0.8 mm |
| Minimum internal radius | 1 mm |
| Drill depth limit | 6× diameter |
| Best surface (machined / polished) | Ra 1.6 / — |
| Hardenable after machining | No |
Sheet metal
| Formability | Better75 / 100 |
|---|---|
| Weldability | Better65 / 100 |
| Bendable | Yes |
Conditions and tempers
How C51000 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 |
|---|---|---|---|---|---|
ODefault Annealed (O) | Softest — parts you will bend or deep-form; not for carrying load | — | — | — | — |
H02 Half Hard (H02) | Half-hard brass/copper — fittings and terminals with slight spring | — | — | — | — |
H04 Full Hard (H04) | Full-hard — electrical contacts, flat springs; no forming | — | — | — | — |
H08 Spring Hard (H08) | Spring temper — clips, battery contacts, spring fingers | — | — | — | — |
Heat treatment and post-processing
Operations FabDigit's suppliers routinely run on C51000, ranked by how often they make sense for this grade.
Heat treatment
| Full Anneal | Restore ductility; relieve residual stress; coarsen grain |
|---|---|
| Stress Relief | Reduce residual stress without changing structure |
| Age C17200 (Beryllium Cu) | Cu-Be peak strength (TF00) |
Post-processing
| Manual Deburr | Deburrstandard |
|---|---|
| Edge Break (0.5mm) | Deburr |
| CMM Inspection | Inspection |
| FAI Report | Inspection |
| Individual Bag | Packaging |
Surface finishes for C51000
Coatings and treatments compatible with copper alloy on the processes C51000 runs on. Pick them in the quote configurator or call them out on the drawing.
Passivation
- Electropolishing
Plating
- Chrome Plating
- Copper Plating
- Electroless Nickel (EN)
- Gold Plating
- Nickel Plating
- Silver Plating
- Tin Plating
Organic Coating
- Painting
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 Copper Alloy C51000 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- EN / DIN / Werkstoff-Nr.
- CuSn5CW451K
- JIS
- C5101
- Also called
- Phosphor Bronze
- Other
- 510Phosphor Bronze 5%A
Stock forms
Raw-material forms FabDigit sources C51000 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.