BenchReference

#47 Drill Bit

Decimal inches 0.0785″
Millimeters 1.994 mm
System Number (wire gauge)

Nearest equivalents in other systems

System Nearest drill Size Difference
Metric 2 mm 0.0787″ / 2 mm +0.006 mm (+0.0002″)
Fractional inch 5/64″ 0.0781″ / 1.984 mm −0.01 mm (−0.0004″)
Letter A 0.2340″ / 5.944 mm +3.95 mm (+0.1555″)
−0.16 mm+0.16 mm#47#49−0.14 mm#48−0.064 mm#46+0.063 mm#45+0.089 mm5/64″−0.01 mm2 mm+0.006 mmA +3.95 mm →tick position = true diameter · number neighbors above, equivalents below · window ±0.16 mm
Positive difference = cuts a slightly larger hole than #47. Sizes beyond the window are listed with arrows — they are not close substitutes.

Tap drill for

Thread Major diameter Pitch
#3-48 UNC 0.0990″ / 2.515 mm 48 TPI

The standard chart recommendation (≈75% thread engagement). Application-specific factors — material, hole depth, tap type — can justify a different drill.

Neighboring number sizes

Drill Decimal in mm vs #47
#49 0.0730 1.854 −0.14 mm
#48 0.0760 1.93 −0.064 mm
#47 0.0785 1.994 —
#46 0.0810 2.057 +0.063 mm
#45 0.0820 2.083 +0.089 mm
Data provenance. ASME B94.11M, Twist Drills (standard drill size series) (ASME). Machinery’s Handbook — tap drill charts (Industrial Press). Millimeter and inch values are converted with the exact definition 1 in = 25.4 mm; the canonical dimension for this number size is 0.0785″. See all data sources.