BenchReference

#60 Drill Bit

Decimal inches 0.0400″
Millimeters 1.016 mm
System Number (wire gauge)

Nearest equivalents in other systems

System Nearest drill Size Difference
Metric 1 mm 0.0394″ / 1 mm −0.016 mm (−0.0006″)
Fractional inch 3/64″ 0.0469″ / 1.191 mm +0.175 mm (+0.0069″)
Letter A 0.2340″ / 5.944 mm +4.928 mm (+0.1940″)
−0.15 mm+0.15 mm#60#62−0.051 mm#61−0.025 mm#59+0.025 mm#58+0.051 mm1 mm−0.016 mm3/64″ +0.175 mm →A +4.928 mm →tick position = true diameter · number neighbors above, equivalents below · window ±0.15 mm
Positive difference = cuts a slightly larger hole than #60. Sizes beyond the window are listed with arrows — they are not close substitutes.

Neighboring number sizes

Drill Decimal in mm vs #60
#62 0.0380 0.965 −0.051 mm
#61 0.0390 0.991 −0.025 mm
#60 0.0400 1.016 —
#59 0.0410 1.041 +0.025 mm
#58 0.0420 1.067 +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 0.0400″. See all data sources.