fractional-inch drill · nominal diameter
5/32
drill bit size.
A 5/32 bit measures 0.1563 in across (3.969 mm).
The fractional diameter is exact; decimal and metric values are conversions.
Calibrated relative diameter · 1 in reference
5/32 · fractional
0.1563 in
3.969 mm Designation5/32fractional
Inch decimal0.1563nominal
Metric conversion3.969millimetres
Where this size sits from 0 to 1 inch 5/32 · 3.969 mm on a zero to 25.4 millimetre scale. Neighbor marks: #22, 4 mm.
Measured neighbors
What sits beside 5/32.
“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