Fit rod

(Shipbuilding) a gauge rod used to try the depth of a bolt hole in order to determine the length of the bolt required.
- Knight.

See also: Fit

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
References in periodicals archive ?
The only thing I could think was, 'Will I ever walk again?'" The next morning, Lucy had a fivehour operation to fit rods into her back, enabling it to heal.