BenchReference / Drill sizes / 7.2 mm 7.2 mm Drill Decimal inches 0.2835″
Millimeters 7.2 mm
System Metric
Nearest equivalents in other systems System Nearest drill Size Difference Fractional inch 9/32″ 0.2813″ / 7.144 mm −0.056 mm (−0.0022″)
Number (wire gauge) #1 0.2280″ / 5.791 mm −1.409 mm (−0.0555″)
Letter K 0.2810″ / 7.137 mm −0.063 mm (−0.0025″)
−0.576 mm +0.576 mm 7.2 mm 7 mm −0.2 mm 7.1 mm −0.1 mm 7.3 mm +0.1 mm 7.4 mm +0.2 mm K −0.063 mm 9/32″ −0.056 mm ← #1 −1.409 mm tick position = true diameter · metric neighbors above, equivalents below · window ±0.58 mm
Positive difference = cuts a slightly larger hole than 7.2 mm. Sizes
beyond the window are listed with arrows — they are not close substitutes.
Neighboring metric sizes Drill Decimal in mm vs 7.2 mm 7 mm 0.2756 7 −0.2 mm 7.1 mm 0.2795 7.1 −0.1 mm 7.2 mm 0.2835 7.2 — 7.3 mm 0.2874 7.3 +0.1 mm 7.4 mm 0.2913 7.4 +0.2 mm
← 7.1 mm (smaller) 7.3 mm (larger) →
Compare 7.2 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 7.2 mm. See all data sources .