BenchReference

#49 Drill Bit

Decimal inches 0.0730″
Millimeters 1.854 mm
System Number (wire gauge)

Nearest equivalents in other systems

System Nearest drill Size Difference
Metric 1.9 mm 0.0748″ / 1.9 mm +0.046 mm (+0.0018″)
Fractional inch 5/64″ 0.0781″ / 1.984 mm +0.13 mm (+0.0051″)
Letter A 0.2340″ / 5.944 mm +4.089 mm (+0.1610″)
−0.15 mm+0.15 mm#49#50−0.076 mm#48+0.076 mm#47+0.14 mm1.9 mm+0.046 mm5/64″+0.13 mm← #51 −0.152 mmA +4.089 mm →tick position = true diameter · number neighbors above, equivalents below · window ±0.15 mm
Positive difference = cuts a slightly larger hole than #49. Sizes beyond the window are listed with arrows — they are not close substitutes.

Neighboring number sizes

Drill Decimal in mm vs #49
#51 0.0670 1.702 −0.152 mm
#50 0.0700 1.778 −0.076 mm
#49 0.0730 1.854 —
#48 0.0760 1.93 +0.076 mm
#47 0.0785 1.994 +0.14 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 0.0730″. See all data sources.