Other naming systemsABSOLUTE DIAMETER DELTA
fractional-inch drill · nominal diameter
49/64
drill bit size.
A 49/64 bit measures 0.7656 in across (19.447 mm).
The fractional diameter is exact; decimal and metric values are conversions.
Calibrated relative diameter · 1 in reference
49/64 · fractional
0.7656 in
19.447 mm Designation49/64fractional
Inch decimal0.7656nominal
Metric conversion19.447millimetres
Where this size sits from 0 to 1 inch 49/64 · 19.447 mm on a zero to 25.4 millimetre scale. Neighbor marks: 3/4, 25/32.
Measured neighbors
What sits beside 49/64.
“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