12 mm Drill Bit Size
A 12 mm drill bit is 0.4724 inches. The nearest common fractional drill bit is 15/32 inch, which measures 0.4688 inches or 11.91 mm.
Quick Answer
Decimal
0.4724 in
Metric
12.00 mm
Closest
15/32 inch
12 mm Drill Bit Equivalent Chart
| Size | Decimal Inches | Metric | Note |
|---|---|---|---|
| 12 mm | 0.4724 in | 12.00 mm | Exact size |
| 15/32 inch | 0.4688 in | 11.91 mm | Closest common fractional size |
| 31/64 inch | 0.4844 in | 12.30 mm | Oversize clearance alternative |
| 1/2 inch | 0.5000 in | 12.70 mm | Larger oversize only when clearance is acceptable |
Common Uses
Large anchors, hardware clearance holes, and fabrication work.
Exact vs Nearest Size
Choose the exact bit for threads, tight hardware fits, dowels, and precision layouts. Use the nearest common equivalent only for rough pilot holes, clearance holes, or material removal where a slight difference is acceptable.
12 mm Drill Bit FAQ
What are the inch and metric dimensions for 12 mm?
12 mm drill bit measures 0.4724 in and 12.00 mm.
What is the closest common equivalent to 12 mm?
15/32 inch is the closest common equivalent listed here. It measures 0.4688 in or 11.91 mm.
Can I substitute another bit for 12 mm?
Use the exact bit size for tap drilling, precision holes, dowels, and manufacturer-specified hardware. A nearby fractional, metric, numbered, or letter drill bit is usually fine only for clearance holes or rough pilot holes.