CuSn7Zn4Pb7-C (CC493K) chemical composition
Leaded gunmetal to EN 1982 with more tin and lead than CuSn5Zn5Pb5-C. The higher lead improves emergency running and conformability, making it a common choice for plain bearings and bushings.
- Designation
- CuSn7Zn4Pb7-C
- Material no.
- CC493K
- Standard
- EN 1982
- Also known as
- Rg7, G-CuSn7ZnPb (2.1090)
- Family
- Tin bronze, gunmetal & bell bronze
Chemical composition (mass %)
| Element | min | max |
|---|---|---|
| SiSilicon | – | 0.01 |
| PPhosphorus | – | 0.10 |
| SSulphur | – | 0.10 |
| NiNickel | – | 2.00 |
| CuCopper | 81.0 | 85.0 |
| FeIron | – | 0.20 |
| SnTin | 6.00 | 8.00 |
| ZnZinc | 2.00 | 5.00 |
| PbLead | 5.00 | 8.00 |
| AlAluminium | – | 0.01 |
| SbAntimony | – | 0.30 |
Basis of values: Limits per EN 1982.
Additional requirements: Cu range includes Ni (Cu+Ni 81.0–85.0)
We cast CuSn7Zn4Pb7-C
Tin bronze castings by sand casting, and by centrifugal casting for bushings, wear rings and sleeves, machined in the group's own CNC machine shop, with the chemistry of every heat verified by optical emission spectrometer and EN 10204 3.1 certificates. Church bells are the craft the foundry started with.
- Sand casting at our foundry in Mandra, Attica; centrifugal casting for bushings, sleeves and liners
- Heat treatment at the foundry (water, oil or air quench); CNC machining in our machine shop in Perama
- Spectrometer analysis of every heat, mechanical testing and NDT
- EN 10204 3.1 inspection certificates; ISO 9001 (both plants) and ISO 14001 (foundry) certified
Other grades in this family
For information only, without warranty: limits per the cited standard or, where stated, typical or house values; ≈ marks a comparable grade, not an equivalent. The current edition of the standard, the purchase order and the drawing govern.