BenchReference / Drill sizes / 15/64″ 15/64″ Drill Bit Decimal inches 0.2344″
Millimeters 5.953 mm
System Fractional inch
Nearest equivalents in other systems System Nearest drill Size Difference Metric 6 mm 0.2362″ / 6 mm +0.047 mm (+0.0018″)
Number (wire gauge) #1 0.2280″ / 5.791 mm −0.162 mm (−0.0064″)
Letter A 0.2340″ / 5.944 mm −0.01 mm (−0.0004″)
−0.476 mm +0.476 mm 15/64″ 7/32″ −0.397 mm 1/4″ +0.397 mm #1 −0.162 mm A −0.01 mm 6 mm +0.047 mm ← 13/64″ −0.794 mm 17/64″ +0.794 mm → tick position = true diameter · fractional neighbors above, equivalents below · window ±0.48 mm
Positive difference = cuts a slightly larger hole than 15/64″. Sizes
beyond the window are listed with arrows — they are not close substitutes.
Neighboring fractional sizes Drill Decimal in mm vs 15/64″ 13/64″ 0.2031 5.159 −0.794 mm 7/32″ 0.2188 5.556 −0.397 mm 15/64″ 0.2344 5.953 — 1/4″ 0.2500 6.35 +0.397 mm 17/64″ 0.2656 6.747 +0.794 mm
← 7/32″ (smaller) 1/4″ (larger) →
Compare 15/64″ 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 0.2344″. See all data sources .