BenchReference / Drill sizes / 6.1 mm 6.1 mm Drill Decimal inches 0.2402″
Millimeters 6.1 mm
System Metric
Nearest equivalents in other systems System Nearest drill Size Difference Fractional inch 15/64″ 0.2344″ / 5.953 mm −0.147 mm (−0.0058″)
Number (wire gauge) #1 0.2280″ / 5.791 mm −0.309 mm (−0.0122″)
Letter C 0.2420″ / 6.147 mm +0.047 mm (+0.0018″)
−0.488 mm +0.488 mm 6.1 mm 5.9 mm −0.2 mm 6 mm −0.1 mm 6.2 mm +0.1 mm 6.3 mm +0.2 mm #1 −0.309 mm 15/64″ −0.147 mm C +0.047 mm tick position = true diameter · metric neighbors above, equivalents below · window ±0.49 mm
Positive difference = cuts a slightly larger hole than 6.1 mm. Sizes
beyond the window are listed with arrows — they are not close substitutes.
Neighboring metric sizes Drill Decimal in mm vs 6.1 mm 5.9 mm 0.2323 5.9 −0.2 mm 6 mm 0.2362 6 −0.1 mm 6.1 mm 0.2402 6.1 — 6.2 mm 0.2441 6.2 +0.1 mm 6.3 mm 0.2480 6.3 +0.2 mm
← 6 mm (smaller) 6.2 mm (larger) →
Compare 6.1 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 6.1 mm. See all data sources .