Definitions
from The Century Dictionary.
- noun A bolt with a thread and a square or hexagonal head.
Etymologies
Sorry, no etymologies found.
Support

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Examples
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The Core is a machine-bolt, 4-1/2 in. long and 5/16 in. in diameter.
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Wind 6 layers of No. 24 or 25 insulated copper wire around a 5/16 machine-bolt that is 2-1/2 in. long.
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