Babbitt metal

Babbitt metal, also called bearing metal or simply Babbitt (and often spelled with a lowercase "b"), is an anti-friction alloy containing about 89% tin, 9% antimony, and 2% copper devised in 1839 by the American inventor Isaac Babbitt (1799–1862) for lining the bearings of steam engines. Various formulations have been devised but in most the microscopic structure consists of relatively hard crystals embedded in a soft matrix. Today the term Babbitt metal is applied to a variety of high-tin and high-lead bearing alloys.