BenchReference

#52 Drill Bit

Decimal inches 0.0635″
Millimeters 1.613 mm
System Number (wire gauge)

Nearest equivalents in other systems

System Nearest drill Size Difference
Metric 1.6 mm 0.0630″ / 1.6 mm −0.013 mm (−0.0005″)
Fractional inch 1/16″ 0.0625″ / 1.587 mm −0.025 mm (−0.0010″)
Letter A 0.2340″ / 5.944 mm +4.331 mm (+0.1705″)
−0.15 mm+0.15 mm#52#53−0.102 mm#51+0.089 mm1/16″−0.025 mm1.6 mm−0.013 mm← #54 −0.216 mm#50 +0.165 mm →A +4.331 mm →tick position = true diameter · number neighbors above, equivalents below · window ±0.15 mm
Positive difference = cuts a slightly larger hole than #52. Sizes beyond the window are listed with arrows — they are not close substitutes.

Neighboring number sizes

Drill Decimal in mm vs #52
#54 0.0550 1.397 −0.216 mm
#53 0.0595 1.511 −0.102 mm
#52 0.0635 1.613 —
#51 0.0670 1.702 +0.089 mm
#50 0.0700 1.778 +0.165 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 0.0635″. See all data sources.