CuSn7Zn4Pb7-C (CC493K)
2.1090The world's most common bearing bronze (Rg7). Higher tin (7%) and lead (7%) content than Rg5 provides superior bearing properties, better wear resistance, and improved self-lubrication under boundary lubrication. Good sliding properties even for occasional dry running during acceleration. Standard material per DIN 1850/ISO 4379 for plain bearings. Used for medium-load sliding bearings, bushings, guide bushings, valve seats, and worm gear nuts in general engineering, textile machinery, and agricultural equipment. ASTM: C93200.
Chemical composition comparison (wt%)
Side-by-side: CuSn7Zn4Pb7-C (CC493K) (EN) (EN 1982) vs ASTM
| Element | CuSn7Zn4Pb7-C (CC493K) (EN) | ASTM | Overlap |
|---|---|---|---|
| Si | ≤ 0.01% | — | — |
| P | ≤ 0.1% | — | — |
| Ni | ≤ 2% | — | — |
| Cu | 81–85% | — | — |
| Al | ≤ 0.01% | — | — |
| Sn | 6–8% | — | — |
| Zn | 2–5% | — | — |
| Pb | 5–8% | — | — |
| Fe | ≤ 0.3% | — | — |
Mechanical properties
As-Cast (GC)
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | 230–270 | MPa |
| Yield Strength | 110–130 | MPa |
| Elongation | 7–14 | % |
| Hardness HB | 65–75 | HB |
General
| Property | Value | Unit |
|---|---|---|
| Density | ≥ 8.8 | g/cm3 |
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