CAC407 Bronze Casting
CAC407 Bronze Casting is a high-strength gunmetal specified under JIS H 5111 CAC407 (formerly BC7), containing nominally 87% copper, 10% tin, 1% lead, and 2% zinc. CAC407 provides higher strength and hardness than CAC406, making it suitable for more demanding structural and bearing casting applications. Indicative price: US$ 9.50/kilogram.
CAC407 Chemical Composition (JIS H 5111)
| Element |
Min % |
Max % |
| Copper (Cu) |
rem |
— |
| Tin (Sn) |
9.0 |
11.0 |
| Zinc (Zn) |
1.0 |
3.0 |
| Lead (Pb) |
0.5 |
2.0 |
| Nickel (Ni) |
— |
1.0 |
| Iron (Fe) |
— |
0.20 |
CAC407 Mechanical Properties (Sand Cast – JIS H 5111)
| Property |
Value |
| Tensile Strength |
295 MPa min |
| Yield Strength (0.2%) |
145 MPa min |
| Elongation |
12% min |
| Brinell Hardness |
80 HB typical |
| Density |
8.77 g/cm³ |
International Equivalents of CAC407
| Standard |
Designation |
Common Name |
| Japan – JIS H5111 |
CAC407 (formerly BC7) |
High Strength Gunmetal |
| ISO 1338 |
CuSn10 |
Tin Bronze |
| Europe – EN 1982 |
CC491K |
CuSn10Pb2 |
| Germany – DIN |
2.1052 |
CuSn10Pb |
| UK – BS 1400 |
LG4 / PB1 |
Leaded Gunmetal / Phosphor Bronze |
| USA – UNS |
C90500 / C92600 |
Gun Metal / Leaded Tin Bronze |
Typical Applications
CAC407 gunmetal castings are used for: high-strength marine fittings and propeller hubs, pressure-tight valve bodies, heavy-duty pump casings and impellers, structural engineering castings, bearing housings, and corrosion-resistant fittings for industrial applications.
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