Definition

Noun: - A soft, white metal alloy used as a lining for bearings: Babbitt metal is a low-friction alloy, typically composed primarily of tin with smaller amounts of copper and antimony. Its primary function is to be cast or bonded onto a harder metal bearing shell to provide a smooth, sacrificial surface that reduces wear and friction on moving parts like shafts.

Usage Examples

• Noun:
  • The mechanic replaced the worn babbitt metal in the engine's connecting rod bearings.
  • Babbitt metal is favored for its excellent conformability and embeddability, which helps protect shafts from damage by foreign particles.

Advanced Usage

• "to pour babbitt" or "to babbit a bearing": These phrases refer to the process of casting molten babbitt metal into a bearing housing to create the bearing surface.
  • The old workshop still had the equipment needed to pour babbitt for the restoration of the antique machinery.

Variants and Related Words

• Babbitt (noun): A common shortened form for babbitt metal.
  • The bearing was lined with a layer of babbitt.
• Babbitted (adjective): Describes a bearing that has been lined with babbitt metal.
  • The babbitted crankshaft bearings were in good condition.

Synonyms

• Bearing alloy: A general term for alloys used in plain bearings.
• White metal: A broader category of alloys that includes babbitt and other similar low-melting-point, tin- or lead-based alloys.

Notes on Meaning

The term "babbitt metal" is an eponym, named after the American inventor Isaac Babbitt. It specifically denotes the class of soft bearing alloys, distinguishing it from other bearing materials like bronze or polymer composites. Its defining characteristic is its use as a lining, not as a solid bearing itself.

Noun

1. an alloy of tin with some copper and antimony; a lining for bearings that reduces friction