#29 Drill Bit Size
A #29 drill bit is 0.1360 inches or 3.45 mm. The closest common fractional drill bit is 9/64 inch, which is slightly larger at 0.1406 inches.
Quick Answer
Decimal
0.1360 in
Metric
3.45 mm
Closest
9/64 inch
#29 Drill Bit Equivalent Chart
| Size | Decimal Inches | Metric | Note |
|---|---|---|---|
| #29 | 0.1360 in | 3.45 mm | Exact size |
| 9/64 inch | 0.1406 in | 3.57 mm | Closest common fractional oversize |
| 1/8 inch | 0.1250 in | 3.18 mm | Common undersize, not an exact substitute |
| 3.5 mm | 0.1378 in | 3.50 mm | Nearby metric size |
Common Uses
Tap drilling and precision holes where a numbered drill size 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.
#29 Drill Bit FAQ
What are the inch and metric dimensions for #29?
#29 drill bit measures 0.1360 in and 3.45 mm.
What is the closest common equivalent to #29?
9/64 inch is the closest common equivalent listed here. It measures 0.1406 in or 3.57 mm.
Can I substitute another bit for #29?
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.