number drill · nominal diameter
#47
drill bit size.
A #47 bit measures 0.0785 in across (1.994 mm).
The inch decimal is the published nominal designation; millimetres are a conversion.
Calibrated relative diameter · 1 in reference
#47 · number
0.0785 in
1.994 mm Designation#47number
Inch decimal0.0785nominal
Metric conversion1.994millimetres
Where this size sits from 0 to 1 inch #47 · 1.994 mm on a zero to 25.4 millimetre scale. Neighbor marks: 2 mm, 5/64.
Measured neighbors
What sits beside #47.
“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