BenchReference / Drill sizes / 15/32″ 15/32″ Drill Bit Decimal inches 0.4688″
Millimeters 11.906 mm
System Fractional inch
In 64ths 30/64″
Nearest equivalents in other systems System Nearest drill Size Difference Metric 11.9 mm 0.4685″ / 11.9 mm −0.006 mm (−0.0002″)
Number (wire gauge) #1 0.2280″ / 5.791 mm −6.115 mm (−0.2408″)
Letter Z 0.4130″ / 10.49 mm −1.416 mm (−0.0558″)
−0.953 mm +0.953 mm 15/32″ 7/16″ −0.794 mm 29/64″ −0.397 mm 31/64″ +0.397 mm 1/2″ +0.794 mm 11.9 mm −0.006 mm ← #1 −6.115 mm ← Z −1.416 mm tick position = true diameter · fractional neighbors above, equivalents below · window ±0.95 mm
Positive difference = cuts a slightly larger hole than 15/32″. Sizes
beyond the window are listed with arrows — they are not close substitutes.
Clearance drill for Neighboring fractional sizes Drill Decimal in mm vs 15/32″ 7/16″ 0.4375 11.112 −0.794 mm 29/64″ 0.4531 11.509 −0.397 mm 15/32″ 0.4688 11.906 — 31/64″ 0.4844 12.303 +0.397 mm 1/2″ 0.5000 12.7 +0.794 mm
← 29/64″ (smaller) 31/64″ (larger) →
Compare 15/32″ 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 0.4688″. See all data sources .