BenchReference

#56 Drill Bit

Decimal inches 0.0465″
Millimeters 1.181 mm
System Number (wire gauge)

Nearest equivalents in other systems

System Nearest drill Size Difference
Metric 1.2 mm 0.0472″ / 1.2 mm +0.019 mm (+0.0007″)
Fractional inch 3/64″ 0.0469″ / 1.191 mm +0.01 mm (+0.0004″)
Letter A 0.2340″ / 5.944 mm +4.763 mm (+0.1875″)
−0.15 mm+0.15 mm#56#58−0.114 mm#57−0.089 mm#55+0.14 mm3/64″+0.01 mm1.2 mm+0.019 mm#54 +0.216 mm →A +4.763 mm →tick position = true diameter · number neighbors above, equivalents below · window ±0.15 mm
Positive difference = cuts a slightly larger hole than #56. Sizes beyond the window are listed with arrows — they are not close substitutes.

Neighboring number sizes

Drill Decimal in mm vs #56
#58 0.0420 1.067 −0.114 mm
#57 0.0430 1.092 −0.089 mm
#56 0.0465 1.181 —
#55 0.0520 1.321 +0.14 mm
#54 0.0550 1.397 +0.216 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 0.0465″. See all data sources.