fractional-inch drill · nominal diameter
13/64
drill bit size.
A 13/64 bit measures 0.2031 in across (5.159 mm).
The fractional diameter is exact; decimal and metric values are conversions.
Calibrated relative diameter · 1 in reference
13/64 · fractional
0.2031 in
5.159 mm Designation13/64fractional
Inch decimal0.2031nominal
Metric conversion5.159millimetres
Where this size sits from 0 to 1 inch 13/64 · 5.159 mm on a zero to 25.4 millimetre scale. Neighbor marks: #6, 5.2 mm.
Measured neighbors
What sits beside 13/64.
“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