fractional-inch drill · nominal diameter
27/64
drill bit size.
A 27/64 bit measures 0.4219 in across (10.716 mm).
The fractional diameter is exact; decimal and metric values are conversions.
Calibrated relative diameter · 1 in reference
27/64 · fractional
0.4219 in
10.716 mm Designation27/64fractional
Inch decimal0.4219nominal
Metric conversion10.716millimetres
Where this size sits from 0 to 1 inch 27/64 · 10.716 mm on a zero to 25.4 millimetre scale. Neighbor marks: 10.7 mm, 10.8 mm.
Measured neighbors
What sits beside 27/64.
“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