fractional-inch drill · nominal diameter
3/64
drill bit size.
A 3/64 bit measures 0.0469 in across (1.191 mm).
The fractional diameter is exact; decimal and metric values are conversions.
Calibrated relative diameter · 1 in reference
3/64 · fractional
0.0469 in
1.191 mm Designation3/64fractional
Inch decimal0.0469nominal
Metric conversion1.191millimetres
Where this size sits from 0 to 1 inch 3/64 · 1.191 mm on a zero to 25.4 millimetre scale. Neighbor marks: 1.2 mm, #56.
Where this bit is specified
What 3/64 is for.
3/64 is the cutting-tap drill for the thread below— usually the reason this size gets looked up. Engagement is calculated from the basic 60° profile; open a thread for its published row, evidence, and limits.
Measured neighbors
What sits beside 3/64.
“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