4.5 mm Drill Bit Size
A 4.5 mm drill bit is 0.1772 inches. The closest standard numbered drill is #16 at 0.1770 inches, while common fractional choices are 11/64 inch undersized or 3/16 inch oversized.
Quick Answer
Decimal
0.1772 in
Metric
4.50 mm
Closest
#16
4.5 mm Drill Bit Equivalent Chart
| Size | Decimal Inches | Metric | Note |
|---|---|---|---|
| 4.5 mm | 0.1772 in | 4.50 mm | Exact size |
| #16 | 0.1770 in | 4.50 mm | Closest numbered drill size |
| 11/64 inch | 0.1719 in | 4.37 mm | Common fractional undersize |
| 3/16 inch | 0.1875 in | 4.76 mm | Common fractional oversize |
Common Uses
Metric clearance holes and medium pilot holes where an exact 4.5 mm bit is specified.
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.
4.5 mm Drill Bit FAQ
What are the inch and metric dimensions for 4.5 mm?
4.5 mm drill bit measures 0.1772 in and 4.50 mm.
What is the closest common equivalent to 4.5 mm?
#16 is the closest common equivalent listed here. It measures 0.1770 in or 4.50 mm.
Can I substitute another bit for 4.5 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.