Other naming systemsABSOLUTE DIAMETER DELTA
fractional-inch drill · nominal diameter
59/64
drill bit size.
A 59/64 bit measures 0.9219 in across (23.416 mm).
The fractional diameter is exact; decimal and metric values are conversions.
Calibrated relative diameter · 1 in reference
59/64 · fractional
0.9219 in
23.416 mm Designation59/64fractional
Inch decimal0.9219nominal
Metric conversion23.416millimetres
Where this size sits from 0 to 1 inch 59/64 · 23.416 mm on a zero to 25.4 millimetre scale. Neighbor marks: 29/32, 15/16.
Measured neighbors
What sits beside 59/64.
“Nearest” means nominal diameter only. It does not make a neighboring size acceptable for a tolerance, tapping, reaming, or fastener application.
Source record
Drill Bit Size Chart.
Fractional sizes are exact rational multiples of one inch.
Open source record