CAC403 Bronze Casting
CAC403 Bronze Casting is a high-tin bronze specified under JIS H 5111 CAC403 (formerly BC3), containing nominally 88% copper and 12% tin. It provides the highest hardness among standard JIS tin bronze casting alloys, used for demanding worm gear and heavy bearing applications in Japanese industrial machinery. Indicative price: US$ 11.00/kilogram.
CAC403 Chemical Composition (JIS H 5111)
| Element |
Min % |
Max % |
| Copper (Cu) |
rem |
— |
| Tin (Sn) |
11.0 |
13.0 |
| Zinc (Zn) |
— |
1.0 |
| Lead (Pb) |
— |
0.50 |
| Phosphorus (P) |
0.05 |
0.30 |
| Iron (Fe) |
— |
0.10 |
CAC403 Mechanical Properties (Sand Cast – JIS H 5111)
| Property |
Value |
| Tensile Strength |
295 MPa min |
| Yield Strength (0.2%) |
160 MPa min |
| Elongation |
5% min |
| Brinell Hardness |
95 HB typical |
| Density |
8.65 g/cm³ |
International Equivalents of CAC403
| Standard |
Designation |
Common Name |
| Japan – JIS H5111 |
CAC403 (formerly BC3) |
High Tin Bronze |
| ISO 1338 |
CuSn12 |
High Tin Bronze |
| Europe – EN 1982 |
CC492K |
CuSn11Pb2 |
| Germany – DIN |
2.1060 |
CuSn14 |
| UK – BS 1400 |
PB2 |
High Tin Phosphor Bronze |
| USA – UNS |
C91100 |
High Tin Bronze (84-16) |
Typical Applications
CAC403 high-tin bronze castings are used for: worm gear wheels against hardened steel worms, maximum-hardness bearings, bridge expansion bearings, heavy industrial machinery gears, piston rings, and wear-resistant components in steel mill and mining equipment.
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