BenchReference

#46 Drill Bit

Decimal inches 0.0810″
Millimeters 2.057 mm
System Number (wire gauge)

Nearest equivalents in other systems

System Nearest drill Size Difference
Metric 2.05 mm 0.0807″ / 2.05 mm −0.007 mm (−0.0003″)
Fractional inch 5/64″ 0.0781″ / 1.984 mm −0.073 mm (−0.0029″)
Letter A 0.2340″ / 5.944 mm +3.886 mm (+0.1530″)
−0.165 mm+0.165 mm#46#48−0.127 mm#47−0.063 mm#45+0.025 mm#44+0.127 mm5/64″−0.073 mm2.05 mm−0.007 mmA +3.886 mm →tick position = true diameter · number neighbors above, equivalents below · window ±0.16 mm
Positive difference = cuts a slightly larger hole than #46. Sizes beyond the window are listed with arrows — they are not close substitutes.

Clearance drill for

Thread Fit
#1-64 UNC close
#1-72 UNF close

Neighboring number sizes

Drill Decimal in mm vs #46
#48 0.0760 1.93 −0.127 mm
#47 0.0785 1.994 −0.063 mm
#46 0.0810 2.057 —
#45 0.0820 2.083 +0.025 mm
#44 0.0860 2.184 +0.127 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 0.0810″. See all data sources.