BenchReference

#72 Drill Bit

Decimal inches 0.0250″
Millimeters 0.635 mm
System Number (wire gauge)

Nearest equivalents in other systems

System Nearest drill Size Difference
Metric 1 mm 0.0394″ / 1 mm +0.365 mm (+0.0144″)
Fractional inch 1/32″ 0.0313″ / 0.794 mm +0.159 mm (+0.0062″)
Letter A 0.2340″ / 5.944 mm +5.309 mm (+0.2090″)
−0.15 mm+0.15 mm#72#74−0.064 mm#73−0.025 mm#71+0.025 mm#70+0.076 mm1 mm +0.365 mm →1/32″ +0.159 mm →tick position = true diameter · number neighbors above, equivalents below · window ±0.15 mm
Positive difference = cuts a slightly larger hole than #72. Sizes beyond the window are listed with arrows — they are not close substitutes.

Neighboring number sizes

Drill Decimal in mm vs #72
#74 0.0225 0.571 −0.064 mm
#73 0.0240 0.61 −0.025 mm
#72 0.0250 0.635 —
#71 0.0260 0.66 +0.025 mm
#70 0.0280 0.711 +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 0.0250″. See all data sources.