5/8 inch Drill Bit Size
A 5/8 inch drill bit is 0.6250 inches or 15.88 mm. It is the closest common fractional size to 16 mm.
Quick Answer
Decimal
0.6250 in
Metric
15.88 mm
Closest
16 mm
5/8 inch Drill Bit Equivalent Chart
| Size | Decimal Inches | Metric | Note |
|---|---|---|---|
| 5/8 inch | 0.6250 in | 15.88 mm | Exact size |
| 16 mm | 0.6299 in | 16.00 mm | Closest common metric size |
| 19/32 inch | 0.5938 in | 15.08 mm | Smaller fractional option |
| 41/64 inch | 0.6406 in | 16.27 mm | Larger fractional option |
Common Uses
Large anchors, plumbing, through-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.
5/8 inch Drill Bit FAQ
What are the inch and metric dimensions for 5/8 inch?
5/8 inch drill bit measures 0.6250 in and 15.88 mm.
What is the closest common equivalent to 5/8 inch?
16 mm is the closest common equivalent listed here. It measures 0.6299 in or 16.00 mm.
Can I substitute another bit for 5/8 inch?
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.