Other naming systemsABSOLUTE DIAMETER DELTA
fractional-inch drill · nominal diameter
61/64
drill bit size.
A 61/64 bit measures 0.9531 in across (24.209 mm).
The fractional diameter is exact; decimal and metric values are conversions.
Calibrated relative diameter · 1 in reference
61/64 · fractional
0.9531 in
24.209 mm Designation61/64fractional
Inch decimal0.9531nominal
Metric conversion24.209millimetres
Where this size sits from 0 to 1 inch 61/64 · 24.209 mm on a zero to 25.4 millimetre scale. Neighbor marks: 15/16, 31/32.
Measured neighbors
What sits beside 61/64.
“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