BenchReference / Drill sizes / 25/32″ 25/32″ Drill Bit Decimal inches 0.7813″
Millimeters 19.844 mm
System Fractional inch
In 64ths 50/64″
Nearest equivalents in other systems System Nearest drill Size Difference Metric 20 mm 0.7874″ / 20 mm +0.156 mm (+0.0062″)
Number (wire gauge) #1 0.2280″ / 5.791 mm −14.053 mm (−0.5533″)
Letter Z 0.4130″ / 10.49 mm −9.354 mm (−0.3683″)
−1.588 mm +1.588 mm 25/32″ 3/4″ −0.794 mm 49/64″ −0.397 mm 51/64″ +0.397 mm 13/16″ +0.794 mm 20 mm +0.156 mm ← #1 −14.053 mm ← Z −9.354 mm tick position = true diameter · fractional neighbors above, equivalents below · window ±1.59 mm
Positive difference = cuts a slightly larger hole than 25/32″. Sizes
beyond the window are listed with arrows — they are not close substitutes.
Clearance drill for Neighboring fractional sizes Drill Decimal in mm vs 25/32″ 3/4″ 0.7500 19.05 −0.794 mm 49/64″ 0.7656 19.447 −0.397 mm 25/32″ 0.7813 19.844 — 51/64″ 0.7969 20.241 +0.397 mm 13/16″ 0.8125 20.637 +0.794 mm
← 49/64″ (smaller) 51/64″ (larger) →
Compare 25/32″ 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 0.7813″. See all data sources .