What Size Drill Bit for a #9 Screw?

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#9 screws are considered medium screws. They’re great for most woodworking projects if you don’t know what size drill bit for a #9 screw, you should know if you’re into very small woodcraft.

What Size Drill Bit for a #9 Screw?

A #9 screw needs a size drill bit depending on the pilot hole size on the intended wood and whether it’s hardwood or softwood. For softwood, you would need a size drill bit of 1/8 inch. You would also need a size drill bit of 9/64 inches for hardwood.

Dewalt black and yellow cordless drill

Don’t confuse this with taps like the 9/16-12 tap. It’s also a bit larger compared to the standard-sized #4 screw.

Also, note that other types of #9 screws may have different drill bit sizes. These include:

  • AB self-tapping screws
  • Type B self-tapping screws
  • Type 25 thread-cutting screws

Tips for Using Medium Drill Bits

Rely on Drill Guides If You Have Low or No Vision

You can buy drill guides built for medium drill bits from hardware stores. It makes drilling with medium drill bits easy as the guide will accurately place the bit into your workpiece.

If you have a drill press, you can make a set of drill guides by drilling holes with medium-sized diameters into small blocks of wood. It’s like a DIY drill guide that you can use to better your drilling accuracy.

If you can’t do either of the two options, you can ask a friend to help you make drill guides using your drill and a built-in level.

Maintain Your Drill Bits and Drill Tools

Your drill bits have a lifespan, and the less you take care of them, the less you will be able to use them. That’s why it’s important to do regular maintenance to check on their condition.

Yellow cordless drill with nails, hammer and other tools laid out on a table

The quality of your work usually determines your tool’s quality. Quality workpieces can only be produced when your tools are in good condition. It’s also essential to do regular maintenance if you want to avoid mistakes and accidents when drilling.

Maintaining your drill bits extend their lifespan so you can use them longer, saving you from unwarranted replacements. You can do maintenance before and after use if you want to be meticulous.

Use a Test Board

When drilling wood or metal, your medium drill bits can create a splintered hole on one side. This is called a blowout which most amateur DIY workers get often. Blowouts can damage your workpiece affecting its quality. 

It can sometimes lead to accidents since the drill bursting through the hole will make you lose control when you’re careless.

To stop this from happening, you can use a test or spare board as a cushion to clamp the piece down. The spare board prevents any blowouts since it acts as a cushion when drilling a hole.


#9 screws are generally used as drywall screws for light projects and jigs. They are often used for projects like decks and fences.