fractional-inch drill · nominal diameter
5/64
drill bit size.
A 5/64 bit measures 0.0781 in across (1.984 mm).
The fractional diameter is exact; decimal and metric values are conversions.
Calibrated relative diameter · 1 in reference
5/64 · fractional
0.0781 in
1.984 mm Designation5/64fractional
Inch decimal0.0781nominal
Metric conversion1.984millimetres
Where this size sits from 0 to 1 inch 5/64 · 1.984 mm on a zero to 25.4 millimetre scale. Neighbor marks: #47, 2 mm.
Measured neighbors
What sits beside 5/64.
“Nearest” means nominal diameter only. It does not make a neighboring size acceptable for a tolerance, tapping, reaming, or fastener application.
This row is at the exposed edge of its series.
Source record
Drill Bit Size Chart.
Fractional sizes are exact rational multiples of one inch.
Open source record