4. CuSn7Zn4Pb7-C (CC493K / CB493K)

CuSn7Zn4Pb7-C (CC493K / CB493K)

Common name Material description
World specifications
High-leaded tin bronzeCuSn7Zn4Pb7-C / CuSn7Zn4Pb7-BCC493K / 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.

Chemical Composition in %, (EN 1982:2017, Castings)


Chemical Composition in %, (EN 1982:2017, Ingots)


Mechanical Properties (EN 1982:2017, Continuous castings)

RmTensile strength min.260 N/mm2
Rp0.2Proof Strength min.120 N/mm2
AElongation min.12 %
HBBrinell hardness min.70 HBW


  • material for plain bearings in mechanical engineering with medium loads;
  • very good emergency running;
  • high wear resistance;
  • sea water resistant.


  • 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.