Characteristic
Commonest, low-budget gun metal alloy for slice bearings. Still has good dry-running
properties and sufficient wear resistance at medium hardness. Also suitable when
unhardened shafts and light edge pressure are being used. Short-chipping material, good
machinability, good corrosion resistance (even in seawater), soft solderable and to a limited
extent hard solderable. The main areas of application are slide bearings and bearing bushings
for general mechanical engineering.
| Common name | Material description | World specifications: European | World specifications: British | World specifications: American |
| High-leaded tin bronze | CuSn7Zn4Pb7-C / CuSn7Zn4Pb7-B | CC493K / CB493K (EN 1982) | – | C93200/ SAE 660 (ASTM B 505) |
Other name: ISO CuSn7Pb7Zn3, UNE C-3530, DS 5426, GC-CuSn7ZnPb.
The equivalence between the standards is not absolute and some variations in composition can exist.
Similar or Equivalent Specifications
| UNS | ASTM | SAE | AMS | Federal | Military | Other |
| C93200 | B505 | 660 |
Chemical Composition in %, (EN 1982:2017, Castings)
| Cu* | Sn | Pb | Zn | Ni | Al | Fe | Mn | P | S | Si | Sb | |
| Min | 81.0 | 5.2 | 5.0 | 2.0 | – | – | – | – | – | – | – | – |
| Max | 86.0 | 8.0 | 8.0 | 5.0 | 2.0 | 0.01 | 2.0 | – | 0.1 | 0.1 | 0.01 | 0.3 |
Chemical Composition in %, (EN 1982:2017, Ingots)
| Cu* | Sn | Pb | Zn | Ni | Al | Fe | Mn | P | S | Si | Sb | |
| Min | 81.0 | 5.2 | 5.0 | 2.0 | – | – | – | – | – | – | – | – |
| Max | 85.0 | 8.0 | 8.0 | 5.0 | 2.0 | 0.01 | 0.20 | – | 0.03 | 0.08 | 0.01 | 0.30 |
Mechanical Properties
| Rm | Tensile strength min. | 260 N/mm2 |
| Rp0.2 | Proof Strength min. | 120 N/mm2 |
| A(50mm) | Elongation min. | 12% |
| HB | Brinell hardness min. | 70 HBW |
Properties:
- material for plain bearings in mechanical engineering with medium loads;
- very good emergency running;
- high wear resistance;
- sea water resistant.
Application:
- bearings of cranes and elevators;
- minor machine tool bearings;
- piston pin bushes for load up to 50N/mm2;
- bearing for packing machines and electric motors;
- general bearing in mechanical engineering;
- valve and gate seat rings;
- guide bushes in hydraulic cylinders;
- slip rings.