BenchReference / Drill sizes / 17/64″ 17/64″ Drill Bit Decimal inches 0.2656″
Millimeters 6.747 mm
System Fractional inch
Nearest equivalents in other systems System Nearest drill Size Difference Metric 6.7 mm 0.2638″ / 6.7 mm −0.047 mm (−0.0018″)
Number (wire gauge) #1 0.2280″ / 5.791 mm −0.956 mm (−0.0376″)
Letter H 0.2660″ / 6.756 mm +0.01 mm (+0.0004″)
−0.54 mm +0.54 mm 17/64″ 1/4″ −0.397 mm 9/32″ +0.397 mm 6.7 mm −0.047 mm H +0.01 mm ← 15/64″ −0.794 mm ← #1 −0.956 mm 19/64″ +0.794 mm → tick position = true diameter · fractional neighbors above, equivalents below · window ±0.54 mm
Positive difference = cuts a slightly larger hole than 17/64″. Sizes
beyond the window are listed with arrows — they are not close substitutes.
Clearance drill for Neighboring fractional sizes Drill Decimal in mm vs 17/64″ 15/64″ 0.2344 5.953 −0.794 mm 1/4″ 0.2500 6.35 −0.397 mm 17/64″ 0.2656 6.747 — 9/32″ 0.2813 7.144 +0.397 mm 19/64″ 0.2969 7.541 +0.794 mm
← 1/4″ (smaller) 9/32″ (larger) →
Compare 17/64″ 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 0.2656″. See all data sources .