BenchReference

#58 Drill Bit

Decimal inches 0.0420″
Millimeters 1.067 mm
System Number (wire gauge)

Nearest equivalents in other systems

System Nearest drill Size Difference
Metric 1.1 mm 0.0433″ / 1.1 mm +0.033 mm (+0.0013″)
Fractional inch 3/64″ 0.0469″ / 1.191 mm +0.124 mm (+0.0049″)
Letter A 0.2340″ / 5.944 mm +4.877 mm (+0.1920″)
−0.15 mm+0.15 mm#58#60−0.051 mm#59−0.025 mm#57+0.025 mm#56+0.114 mm1.1 mm+0.033 mm3/64″+0.124 mmA +4.877 mm →tick position = true diameter · number neighbors above, equivalents below · window ±0.15 mm
Positive difference = cuts a slightly larger hole than #58. Sizes beyond the window are listed with arrows — they are not close substitutes.

Neighboring number sizes

Drill Decimal in mm vs #58
#60 0.0400 1.016 −0.051 mm
#59 0.0410 1.041 −0.025 mm
#58 0.0420 1.067 —
#57 0.0430 1.092 +0.025 mm
#56 0.0465 1.181 +0.114 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 0.0420″. See all data sources.