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- (engineering, machining) A cylindrical iron or steel bar used as a lever; thus:
- A short bar put through the hole in a socket spanner or box spanner to provide leverage.
- A bar used to loosen or tighten some types of chucks and tool holders on machine tools such as lathes or milling machines.
- A set of two tommy bars is the standard tooling for the spindle nose threads of some minilathes and minimills.
- (tool containing an integral tommy bar): T-handle
- (tool involving an analogous male cylindrical portion): pin spanner
- (hooked bars, differentiated from tommy bars): crowbar, prybar, jimmy