Babbitt metals are special kinds of alloys used to line the bearings of cranks, axles, and similar moving parts. They can be bonded to the bearings by mechanical or chemical means. Babbitt metals reduce friction and keep the bearings from becoming too hot. They mainly consist of lead, tin, or both with small amounts of copper, antimony, or other metal. Other elements may be added to achieve special properties. For example, arsenic improves the ability of the metals to withstand high temperatures. In use, the soft metals of the bearing conform to the shape of the axle they enclose. The alloys are named for the American inventor Isaac Babbitt.
