1 8 Drill Bit Guide: Sizing, Use, and Maintenance
Discover the essentials of the 1 8 drill bit, including sizing, materials, use cases in wood and metal, maintenance, and safety tips for precise, clean holes.
1 8 drill bit is a drill bit with a diameter of 1/8 inch, a common fractional size used for small holes. It is a versatile tool for light drilling in wood, metal, and plastic.
What is a 1 8 drill bit?
The 1 8 drill bit is a drill bit with a diameter of 1/8 inch, a common fractional size used for small holes. It belongs to the family of twist bits and fits most standard drill chucks found on hobbyist and professional tools. This size sits between the smaller micro bits and larger common sizes like 3/16 and 1/4 inch, offering a practical balance of hole size and drilling speed. For many tasks, a pilot hole in wood or metal helps guide screws and reduces splitting, and the 1 8 drill bit is a frequent first choice. In practice, it is versatile enough for light metalwork, soft plastics, and fine woodworking where a precise, small-diameter hole is required. According to Drill Bits Pro, this size is among the most frequently used by DIYers and tradespeople for starting holes or for creating clearance holes around small fasteners. You’ll often find it included in standard bit sets as a dependable baseline option.
This bit is easy to recognize and easy to replace, which makes it a trusted staple in both home workshops and professional shops. Understanding its role helps you plan hole sizes for screws, rivets, and dowel joints. When paired with appropriate pilot holes and guides, the 1 8 drill bit reduces walking and improves hole quality across many materials.
Got Questions?
What is a 1 8 drill bit and what is it used for?
A 1 8 drill bit is a drill bit with a 1/8 inch diameter, commonly used for pilot holes, small openings, and screw clearances in wood, metal, and plastic. It helps start holes cleanly and reduces material splitting.
A 1 8 drill bit is a small drill bit used for starting holes and small clearances in wood, metal, and plastic.
What materials can you drill with a 1 8 bit?
This size works across several materials, with wood and soft metals being the most forgiving. In metal, use slower speeds and lubrication to prevent overheating.
It works well on wood and soft metals, but you should slow down and lubricate when drilling metal.
Should I use a pilot hole when drilling with a 1 8 bit?
Yes, especially for hardwoods or dense plastics. A pilot hole guides the bit and minimizes splitting. You can use an even smaller bit to create the pilot before using the 1 8 bit.
Yes, start with a small pilot hole to guide the bit and prevent splitting.
What drill bit materials are best for longevity?
For longevity, consider cobalt or carbide variants if you work with hard metals frequently. HSS works well for most DIY tasks. Coatings like TiN reduce heat and extend life.
Cobalt or carbide bits last longer for hard metals; HSS is fine for most DIY jobs, with coatings helping too.
How do I avoid dulling a 1 8 bit quickly?
Avoid applying excessive pressure, let the bit cut rather than forcing it. Use proper speeds and keep the bit cool with lubrication when drilling metal.
Don’t push hard; let the bit do the cutting and keep it cool.
How should I sharpen a dull 1 8 drill bit?
Sharpening should restore a clean edge with the correct geometry. Use a file or a dedicated sharpener designed for twist bits, maintaining the original point angle.
Sharpen with a suitable file or sharpener without changing the edge angle.
Top Takeaways
- Start with the right size for clean, controlled holes
- Keep bits sharp and free of pitch to maximize life
- Use lubrication when drilling metal to manage heat
- Clamp workpieces firmly to prevent wandering
- Maintain a small, organized set for quick project readiness