BenchReference

#61 Drill Bit

Decimal inches 0.0390″
Millimeters 0.991 mm
System Number (wire gauge)

Nearest equivalents in other systems

System Nearest drill Size Difference
Metric 1 mm 0.0394″ / 1 mm +0.009 mm (+0.0004″)
Fractional inch 1/32″ 0.0313″ / 0.794 mm −0.197 mm (−0.0077″)
Letter A 0.2340″ / 5.944 mm +4.953 mm (+0.1950″)
−0.15 mm+0.15 mm#61#63−0.051 mm#62−0.025 mm#60+0.025 mm#59+0.051 mm1 mm+0.009 mm← 1/32″ −0.197 mmA +4.953 mm →tick position = true diameter · number neighbors above, equivalents below · window ±0.15 mm
Positive difference = cuts a slightly larger hole than #61. Sizes beyond the window are listed with arrows — they are not close substitutes.

Neighboring number sizes

Drill Decimal in mm vs #61
#63 0.0370 0.94 −0.051 mm
#62 0.0380 0.965 −0.025 mm
#61 0.0390 0.991 —
#60 0.0400 1.016 +0.025 mm
#59 0.0410 1.041 +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 0.0390″. See all data sources.