BenchReference / Drill sizes / 1.7 mm 1.7 mm Drill Decimal inches 0.0669″
Millimeters 1.7 mm
System Metric
Nearest equivalents in other systems System Nearest drill Size Difference Fractional inch 1/16″ 0.0625″ / 1.587 mm −0.113 mm (−0.0044″)
Number (wire gauge) #51 0.0670″ / 1.702 mm +0.002 mm (+0.0001″)
Letter A 0.2340″ / 5.944 mm +4.244 mm (+0.1671″)
−0.15 mm +0.15 mm 1.7 mm 1.6 mm −0.1 mm 1.8 mm +0.1 mm 1/16″ −0.113 mm #51 +0.002 mm ← 1.5 mm −0.2 mm 1.9 mm +0.2 mm → A +4.244 mm → tick position = true diameter · metric neighbors above, equivalents below · window ±0.15 mm
Positive difference = cuts a slightly larger hole than 1.7 mm. Sizes
beyond the window are listed with arrows — they are not close substitutes.
Clearance drill for Neighboring metric sizes Drill Decimal in mm vs 1.7 mm 1.5 mm 0.0591 1.5 −0.2 mm 1.6 mm 0.0630 1.6 −0.1 mm 1.7 mm 0.0669 1.7 — 1.8 mm 0.0709 1.8 +0.1 mm 1.9 mm 0.0748 1.9 +0.2 mm
← 1.6 mm (smaller) 1.8 mm (larger) →
Compare 1.7 mm 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 metric size is 1.7 mm. See all data sources .