Other naming systemsABSOLUTE DIAMETER DELTA
fractional-inch drill · nominal diameter
25/32
drill bit size.
A 25/32 bit measures 0.7813 in across (19.844 mm).
The fractional diameter is exact; decimal and metric values are conversions.
Calibrated relative diameter · 1 in reference
25/32 · fractional
0.7813 in
19.844 mm Designation25/32fractional
Inch decimal0.7813nominal
Metric conversion19.844millimetres
Where this size sits from 0 to 1 inch 25/32 · 19.844 mm on a zero to 25.4 millimetre scale. Neighbor marks: 51/64, 49/64.
Measured neighbors
What sits beside 25/32.
“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