Products / C51900
C5191 Phosphor Bronze Strip
C5191 is the general-purpose phosphor bronze for springs and contacts: good strength, formability and fatigue resistance at a moderate cost. C5210, with higher tin content, is available where more spring force is needed.
Equivalent designations
| System | Designation |
|---|---|
| UNS | C51900 |
| EN | CuSn6 / CW452K |
| JIS | C5191 |
| GB | QSn6.5-0.1 |
Typical applications
- Connector contacts
- Switch and relay springs
- Terminals
- Shielding clips
- Fuse clips
Chemical composition (%)
| Element | Content |
|---|---|
| Sn | 5.5 – 7.0 |
| P | 0.03 – 0.35 |
| Cu + Sn + P | ≥ 99.5 |
Physical properties
| Property | Value |
|---|---|
| Density | 8.83 g/cm³ |
| Elastic modulus | 110 GPa |
| Electrical conductivity | 13 – 15 % IACS |
Tempers and tensile strength
| Temper | Condition | Tensile strength (MPa) |
|---|---|---|
| O | Annealed | ≥ 315 |
| 1/4H | Quarter hard | 390 – 510 |
| 1/2H | Half hard | 490 – 610 |
| H | Hard | 590 – 685 |
| EH | Extra hard | ≥ 635 |
Values follow the limits of the governing standard. The mill test certificate for each lot states the measured values.
Supply range
| Item | Value |
|---|---|
| Thickness | TO CONFIRM |
| Width | TO CONFIRM |
| Form | Coil, slit to width |
| Minimum order | TO CONFIRM |
| Lead time | TO CONFIRM |
Questions buyers ask
What is the difference between C5191 and C5210?
C5210 contains 7 to 9 % tin against 5.5 to 7 % in C5191. The extra tin raises strength and spring performance and slightly lowers conductivity. C5210 is the usual choice for high-cycle springs.
What documents come with each shipment?
The original mill test certificate for the heat lot, a packing list with coil numbers, and RoHS and REACH declarations.
Request a quotation
Send us the grade, temper, thickness, width and quantity. We reply within one working day.
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