BenchReference

#6 Drill Bit

Decimal inches 0.2040″
Millimeters 5.182 mm
System Number (wire gauge)

Nearest equivalents in other systems

System Nearest drill Size Difference
Metric 5.2 mm 0.2047″ / 5.2 mm +0.018 mm (+0.0007″)
Fractional inch 13/64″ 0.2031″ / 5.159 mm −0.022 mm (−0.0009″)
Letter A 0.2340″ / 5.944 mm +0.762 mm (+0.0300″)
−0.415 mm+0.415 mm#6#8−0.127 mm#7−0.076 mm#5+0.038 mm#4+0.127 mm13/64″−0.022 mm5.2 mm+0.018 mmA +0.762 mm →tick position = true diameter · number neighbors above, equivalents below · window ±0.41 mm
Positive difference = cuts a slightly larger hole than #6. Sizes beyond the window are listed with arrows — they are not close substitutes.

Neighboring number sizes

Drill Decimal in mm vs #6
#8 0.1990 5.055 −0.127 mm
#7 0.2010 5.105 −0.076 mm
#6 0.2040 5.182 —
#5 0.2055 5.22 +0.038 mm
#4 0.2090 5.309 +0.127 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 0.2040″. See all data sources.