BenchReference

#74 Drill Bit

Decimal inches 0.0225″
Millimeters 0.571 mm
System Number (wire gauge)

Nearest equivalents in other systems

System Nearest drill Size Difference
Metric 1 mm 0.0394″ / 1 mm +0.429 mm (+0.0169″)
Fractional inch 1/64″ 0.0156″ / 0.397 mm −0.175 mm (−0.0069″)
Letter A 0.2340″ / 5.944 mm +5.372 mm (+0.2115″)
−0.15 mm+0.15 mm#74#76−0.063 mm#75−0.038 mm#73+0.038 mm#72+0.064 mm← 1/64″ −0.175 mm1 mm +0.429 mm →A +5.372 mm →tick position = true diameter · number neighbors above, equivalents below · window ±0.15 mm
Positive difference = cuts a slightly larger hole than #74. Sizes beyond the window are listed with arrows — they are not close substitutes.

Neighboring number sizes

Drill Decimal in mm vs #74
#76 0.0200 0.508 −0.063 mm
#75 0.0210 0.533 −0.038 mm
#74 0.0225 0.571 —
#73 0.0240 0.61 +0.038 mm
#72 0.0250 0.635 +0.064 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 0.0225″. See all data sources.