Other naming systemsABSOLUTE DIAMETER DELTA
fractional-inch drill · nominal diameter
27/32
drill bit size.
A 27/32 bit measures 0.8438 in across (21.431 mm).
The fractional diameter is exact; decimal and metric values are conversions.
Calibrated relative diameter · 1 in reference
27/32 · fractional
0.8438 in
21.431 mm Designation27/32fractional
Inch decimal0.8438nominal
Metric conversion21.431millimetres
Where this size sits from 0 to 1 inch 27/32 · 21.431 mm on a zero to 25.4 millimetre scale. Neighbor marks: 53/64, 55/64.
Measured neighbors
What sits beside 27/32.
“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