Other naming systemsABSOLUTE DIAMETER DELTA
fractional-inch drill · nominal diameter
43/64
drill bit size.
A 43/64 bit measures 0.6719 in across (17.066 mm).
The fractional diameter is exact; decimal and metric values are conversions.
Calibrated relative diameter · 1 in reference
43/64 · fractional
0.6719 in
17.066 mm Designation43/64fractional
Inch decimal0.6719nominal
Metric conversion17.066millimetres
Where this size sits from 0 to 1 inch 43/64 · 17.066 mm on a zero to 25.4 millimetre scale. Neighbor marks: 11/16, 21/32.
Measured neighbors
What sits beside 43/64.
“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