BenchReference

#64 Drill Bit

Decimal inches 0.0360″
Millimeters 0.914 mm
System Number (wire gauge)

Nearest equivalents in other systems

System Nearest drill Size Difference
Metric 1 mm 0.0394″ / 1 mm +0.086 mm (+0.0034″)
Fractional inch 1/32″ 0.0313″ / 0.794 mm −0.121 mm (−0.0047″)
Letter A 0.2340″ / 5.944 mm +5.029 mm (+0.1980″)
−0.15 mm+0.15 mm#64#66−0.076 mm#65−0.025 mm#63+0.025 mm#62+0.051 mm1/32″−0.121 mm1 mm+0.086 mmA +5.029 mm →tick position = true diameter · number neighbors above, equivalents below · window ±0.15 mm
Positive difference = cuts a slightly larger hole than #64. Sizes beyond the window are listed with arrows — they are not close substitutes.

Neighboring number sizes

Drill Decimal in mm vs #64
#66 0.0330 0.838 −0.076 mm
#65 0.0350 0.889 −0.025 mm
#64 0.0360 0.914 —
#63 0.0370 0.94 +0.025 mm
#62 0.0380 0.965 +0.051 mm
Data provenance. ASME B94.11M, Twist Drills (standard drill size series) (ASME). Millimeter and inch values are converted with the exact definition 1 in = 25.4 mm; the canonical dimension for this number size is 0.0360″. See all data sources.