BenchReference

#70 Drill Bit

Decimal inches 0.0280″
Millimeters 0.711 mm
System Number (wire gauge)

Nearest equivalents in other systems

System Nearest drill Size Difference
Metric 1 mm 0.0394″ / 1 mm +0.289 mm (+0.0114″)
Fractional inch 1/32″ 0.0313″ / 0.794 mm +0.083 mm (+0.0033″)
Letter A 0.2340″ / 5.944 mm +5.232 mm (+0.2060″)
−0.15 mm+0.15 mm#70#72−0.076 mm#71−0.051 mm#69+0.03 mm#68+0.076 mm1/32″+0.083 mm1 mm +0.289 mm →A +5.232 mm →tick position = true diameter · number neighbors above, equivalents below · window ±0.15 mm
Positive difference = cuts a slightly larger hole than #70. Sizes beyond the window are listed with arrows — they are not close substitutes.

Neighboring number sizes

Drill Decimal in mm vs #70
#72 0.0250 0.635 −0.076 mm
#71 0.0260 0.66 −0.051 mm
#70 0.0280 0.711 —
#69 0.0292 0.742 +0.03 mm
#68 0.0310 0.787 +0.076 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 0.0280″. See all data sources.