What is C51000 Phosphor Bronze?
C51000 phosphor bronze is a wrought copper-tin-phosphorus alloy used for springs, electrical connectors, fasteners, bushings, gears, and wear components. It is commonly called 510 bronze, phosphor bronze 5% A, or phos bronze.
This alloy is known for good fatigue resistance, corrosion resistance, formability, spring properties, and moderate electrical conductivity. Mechanical properties depend strongly on temper, so the exact strip, sheet, plate, or bar condition should be confirmed.
Common Names and Cross References
| Name or designation | How it is commonly used |
|---|---|
| C51000 | UNS alloy designation |
| 510 Bronze | Common stock and purchasing name |
| Phosphor Bronze 5% A | Common alloy description |
| Phos bronze | Common shorthand |
Chemical Composition (%)
| Element | Minimum | Maximum | Nominal |
|---|---|---|---|
| Copper (Cu) | Remainder | Remainder | Balance |
| Tin (Sn) | 4.2 | 5.8 | - |
| Phosphorus (P) | 0.03 | 0.35 | - |
| Zinc (Zn) | - | 0.30 | - |
| Iron (Fe) | - | 0.10 | - |
| Lead (Pb) | - | 0.05 | - |
Mechanical, Electrical, and Physical Properties
Properties vary by temper and product form. The values below reflect common C51000 datasheet examples.
| Property | Typical published value |
|---|---|
| Tensile strength, annealed | About 46,000-50,000 psi minimum |
| Tensile strength, half hard | About 70,000 psi typical |
| Tensile strength, hard | About 84,000 psi typical |
| Tensile strength, extra hard | About 96,000 psi typical |
| Elongation | About 2-18%, depending on temper |
| Electrical conductivity | About 15% IACS |
| Thermal conductivity | About 40 Btu-ft/(hr-ft2-F) |
| Density | 0.320 lb/in3 |
| Modulus of elasticity | 16,000 ksi |
| Machinability rating | 20, based on free-cutting brass = 100 |
Fabrication Suitability
| Operation | Suitability |
|---|---|
| Drawing | Excellent |
| Spinning | Excellent |
| Cold working | Excellent |
| Soldering | Excellent |
| Brazing | Excellent |
| Gas shielded arc welding | Good |
| Machining | Fair to poor |
Typical Applications for C51000
- Springs, clips, contacts, and electrical connectors.
- Fasteners, washers, and formed components.
- Bushings, gears, and wear components.
- Marine and corrosion-resistant hardware.
- Precision stamped or formed phosphor bronze parts.
RFQ Details for C51000 Parts
Send the C51000 callout, product form, temper, thickness or bar size, finished dimensions, quantity, spring or conductivity requirements, and drawings. For cast bearing bronze applications, compare the requirement with C93200 / SAE 660 bearing bronze.
Available Forms
Available Forms and Shapes
Review common product forms for Phosphor Bronze C51000, then send drawings, dimensions, quantity, and finished-part requirements for material and production guidance.
Bronze Flat Plate
Bronze flat plate, flat bar, and rectangular stock for wear plates, guide strips, thrust surfaces, and custom machined parts.
View Product Form
Bronze Solid Bar
Bronze solid round bar and rod stock for machining bushings, bearings, pins, spacers, gears, and custom bronze parts.
View Product Form
Bronze Thrust Washers
Bronze thrust washers and bearing washers machined from C93200 SAE 660 and high-strength bronze alloys for axial load support.
View Product Form
Custom CNC Bronze Parts
Custom CNC machined bronze components, bushings, lead screw nuts, wear parts, and replacement parts made from drawings or samples.
View Product Form