BenchReference / Drill sizes / 3.7 mm 3.7 mm Drill Decimal inches 0.1457″
Millimeters 3.7 mm
System Metric
Nearest equivalents in other systems System Nearest drill Size Difference Fractional inch 9/64″ 0.1406″ / 3.572 mm −0.128 mm (−0.0050″)
Number (wire gauge) #26 0.1470″ / 3.734 mm +0.034 mm (+0.0013″)
Letter A 0.2340″ / 5.944 mm +2.244 mm (+0.0883″)
−0.296 mm +0.296 mm 3.7 mm 3.5 mm −0.2 mm 3.6 mm −0.1 mm 3.8 mm +0.1 mm 3.9 mm +0.2 mm 9/64″ −0.128 mm #26 +0.034 mm A +2.244 mm → tick position = true diameter · metric neighbors above, equivalents below · window ±0.3 mm
Positive difference = cuts a slightly larger hole than 3.7 mm. Sizes
beyond the window are listed with arrows — they are not close substitutes.
Clearance drill for Neighboring metric sizes Drill Decimal in mm vs 3.7 mm 3.5 mm 0.1378 3.5 −0.2 mm 3.6 mm 0.1417 3.6 −0.1 mm 3.7 mm 0.1457 3.7 — 3.8 mm 0.1496 3.8 +0.1 mm 3.9 mm 0.1535 3.9 +0.2 mm
← 3.6 mm (smaller) 3.8 mm (larger) →
Compare 3.7 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 3.7 mm. See all data sources .