number drill · nominal diameter
#79
drill bit size.
A #79 bit measures 0.0145 in across (0.368 mm).
The inch decimal is the published nominal designation; millimetres are a conversion.
Calibrated relative diameter · 1 in reference
#79 · number
0.0145 in
0.368 mm Designation#79number
Inch decimal0.0145nominal
Metric conversion0.368millimetres
Where this size sits from 0 to 1 inch #79 · 0.368 mm on a zero to 25.4 millimetre scale. Neighbor marks: #80, 1/64.
Measured neighbors
What sits beside #79.
“Nearest” means nominal diameter only. It does not make a neighboring size acceptable for a tolerance, tapping, reaming, or fastener application.
Source record
ASME.
The standard text is paywalled. Number and letter series are cross-checked against public manufacturer charts; exact standard edition/page verification remains a release gate.
Open source record