BenchReference

12 mm Drill

Decimal inches 0.4724″
Millimeters 12 mm
System Metric

Nearest equivalents in other systems

System Nearest drill Size Difference
Fractional inch 15/32″ 0.4688″ / 11.906 mm −0.094 mm (−0.0037″)
Number (wire gauge) #1 0.2280″ / 5.791 mm −6.209 mm (−0.2444″)
Letter Z 0.4130″ / 10.49 mm −1.51 mm (−0.0594″)
−0.96 mm+0.96 mm12 mm11.8 mm−0.2 mm11.9 mm−0.1 mm12.1 mm+0.1 mm12.2 mm+0.2 mm15/32″−0.094 mm← #1 −6.209 mm← Z −1.51 mmtick position = true diameter · metric neighbors above, equivalents below · window ±0.96 mm
Positive difference = cuts a slightly larger hole than 12 mm. Sizes beyond the window are listed with arrows — they are not close substitutes.

Tap drill for

Thread Major diameter Pitch
M14 × 2 0.5512″ / 14 mm 2 mm

The standard chart recommendation (≈75% thread engagement). Application-specific factors — material, hole depth, tap type — can justify a different drill.

Clearance drill for

Thread Fit
M10 × 1.5 loose
M10 × 1 loose
M10 × 1.25 loose

Neighboring metric sizes

Drill Decimal in mm vs 12 mm
11.8 mm 0.4646 11.8 −0.2 mm
11.9 mm 0.4685 11.9 −0.1 mm
12 mm 0.4724 12 —
12.1 mm 0.4764 12.1 +0.1 mm
12.2 mm 0.4803 12.2 +0.2 mm
Data provenance. ASME B94.11M, Twist Drills (standard drill size series) (ASME). Machinery’s Handbook — tap drill charts (Industrial Press). Millimeter and inch values are converted with the exact definition 1 in = 25.4 mm; the canonical dimension for this metric size is 12 mm. See all data sources.