BenchReference / Drill sizes / 1/16″ 1/16″ Drill Bit Decimal inches 0.0625″
Millimeters 1.587 mm
System Fractional inch
In 64ths 4/64″
Nearest equivalents in other systems System Nearest drill Size Difference Metric 1.6 mm 0.0630″ / 1.6 mm +0.013 mm (+0.0005″)
Number (wire gauge) #52 0.0635″ / 1.613 mm +0.025 mm (+0.0010″)
Letter A 0.2340″ / 5.944 mm +4.356 mm (+0.1715″)
−0.15 mm +0.15 mm 1/16″ 1.6 mm +0.013 mm #52 +0.025 mm ← 1/32″ −0.794 mm ← 3/64″ −0.397 mm 5/64″ +0.397 mm → 3/32″ +0.794 mm → tick position = true diameter · fractional neighbors above, equivalents below · window ±0.15 mm
Positive difference = cuts a slightly larger hole than 1/16″. Sizes
beyond the window are listed with arrows — they are not close substitutes.
Neighboring fractional sizes Drill Decimal in mm vs 1/16″ 1/32″ 0.0313 0.794 −0.794 mm 3/64″ 0.0469 1.191 −0.397 mm 1/16″ 0.0625 1.587 — 5/64″ 0.0781 1.984 +0.397 mm 3/32″ 0.0938 2.381 +0.794 mm
← 3/64″ (smaller) 5/64″ (larger) →
Compare 1/16″ with another size
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 fractional size is 0.0625″. See all data sources .