BenchReference / Drill sizes / 5/32″ 5/32″ Drill Bit Decimal inches 0.1563″
Millimeters 3.969 mm
System Fractional inch
In 64ths 10/64″
Nearest equivalents in other systems System Nearest drill Size Difference Metric 4 mm 0.1575″ / 4 mm +0.031 mm (+0.0012″)
Number (wire gauge) #22 0.1570″ / 3.988 mm +0.019 mm (+0.0008″)
Letter A 0.2340″ / 5.944 mm +1.975 mm (+0.0777″)
−0.318 mm +0.318 mm 5/32″ #22 +0.019 mm 4 mm +0.031 mm ← 1/8″ −0.794 mm ← 9/64″ −0.397 mm 11/64″ +0.397 mm → 3/16″ +0.794 mm → tick position = true diameter · fractional neighbors above, equivalents below · window ±0.32 mm
Positive difference = cuts a slightly larger hole than 5/32″. Sizes
beyond the window are listed with arrows — they are not close substitutes.
Clearance drill for Neighboring fractional sizes Drill Decimal in mm vs 5/32″ 1/8″ 0.1250 3.175 −0.794 mm 9/64″ 0.1406 3.572 −0.397 mm 5/32″ 0.1563 3.969 — 11/64″ 0.1719 4.366 +0.397 mm 3/16″ 0.1875 4.762 +0.794 mm
← 9/64″ (smaller) 11/64″ (larger) →
Compare 5/32″ 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 0.1563″. See all data sources .