Leaded bronze typically contains copper as the primary element, usually making up around 80-90% of the alloy. The addition of lead constitutes about 5-15% of the alloy composition. In some cases, small amounts of other elements, such as tin, zinc, or nickel, may be present to further enhance specific properties.

Leaded bronze is renowned for its exceptional machinability. The lead content forms soft particles within the bronze matrix, which helps to break chips during machining. This results in improved chip control, reduced tool wear, and enhanced surface finish during the machining process.

The lead in leaded bronze also provides a low coefficient of friction, making it ideal for applications where reduced friction and smooth operation are required. This property is valuable in various machinery and mechanical systems.