BenchReference

1.6 mm Drill

Decimal inches 0.0630″
Millimeters 1.6 mm
System Metric

Nearest equivalents in other systems

System Nearest drill Size Difference
Fractional inch 1/16″ 0.0625″ / 1.587 mm −0.013 mm (−0.0005″)
Number (wire gauge) #52 0.0635″ / 1.613 mm +0.013 mm (+0.0005″)
Letter A 0.2340″ / 5.944 mm +4.344 mm (+0.1710″)
−0.15 mm+0.15 mm1.6 mm1.5 mm−0.1 mm1.7 mm+0.1 mm1/16″−0.013 mm#52+0.013 mm← 1.4 mm −0.2 mm1.8 mm +0.2 mm →A +4.344 mm →tick position = true diameter · metric neighbors above, equivalents below · window ±0.15 mm
Positive difference = cuts a slightly larger hole than 1.6 mm. Sizes beyond the window are listed with arrows — they are not close substitutes.

Tap drill for

Thread Major diameter Pitch
M2 × 0.4 0.0787″ / 2 mm 0.4 mm

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

Neighboring metric sizes

Drill Decimal in mm vs 1.6 mm
1.4 mm 0.0551 1.4 −0.2 mm
1.5 mm 0.0591 1.5 −0.1 mm
1.6 mm 0.0630 1.6 —
1.7 mm 0.0669 1.7 +0.1 mm
1.8 mm 0.0709 1.8 +0.2 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 metric size is 1.6 mm. See all data sources.