BenchReference

#75 Drill Bit

Decimal inches 0.0210″
Millimeters 0.533 mm
System Number (wire gauge)

Nearest equivalents in other systems

System Nearest drill Size Difference
Metric 1 mm 0.0394″ / 1 mm +0.467 mm (+0.0184″)
Fractional inch 1/64″ 0.0156″ / 0.397 mm −0.137 mm (−0.0054″)
Letter A 0.2340″ / 5.944 mm +5.41 mm (+0.2130″)
−0.15 mm+0.15 mm#75#77−0.076 mm#76−0.025 mm#74+0.038 mm#73+0.076 mm1/64″−0.137 mm1 mm +0.467 mm →A +5.41 mm →tick position = true diameter · number neighbors above, equivalents below · window ±0.15 mm
Positive difference = cuts a slightly larger hole than #75. Sizes beyond the window are listed with arrows — they are not close substitutes.

Neighboring number sizes

Drill Decimal in mm vs #75
#77 0.0180 0.457 −0.076 mm
#76 0.0200 0.508 −0.025 mm
#75 0.0210 0.533 —
#74 0.0225 0.571 +0.038 mm
#73 0.0240 0.61 +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 0.0210″. See all data sources.