BenchReference / Drill sizes / 7.1 mm 7.1 mm Drill Decimal inches 0.2795″
Millimeters 7.1 mm
System Metric
Nearest equivalents in other systems System Nearest drill Size Difference Fractional inch 9/32″ 0.2813″ / 7.144 mm +0.044 mm (+0.0017″)
Number (wire gauge) #1 0.2280″ / 5.791 mm −1.309 mm (−0.0515″)
Letter K 0.2810″ / 7.137 mm +0.037 mm (+0.0015″)
−0.568 mm +0.568 mm 7.1 mm 6.9 mm −0.2 mm 7 mm −0.1 mm 7.2 mm +0.1 mm 7.3 mm +0.2 mm K +0.037 mm 9/32″ +0.044 mm ← #1 −1.309 mm tick position = true diameter · metric neighbors above, equivalents below · window ±0.57 mm
Positive difference = cuts a slightly larger hole than 7.1 mm. Sizes
beyond the window are listed with arrows — they are not close substitutes.
Neighboring metric sizes Drill Decimal in mm vs 7.1 mm 6.9 mm 0.2717 6.9 −0.2 mm 7 mm 0.2756 7 −0.1 mm 7.1 mm 0.2795 7.1 — 7.2 mm 0.2835 7.2 +0.1 mm 7.3 mm 0.2874 7.3 +0.2 mm
← 7 mm (smaller) 7.2 mm (larger) →
Compare 7.1 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 7.1 mm. See all data sources .