Round File

What is it?

The round file is a cylindrical cutting tool that enlarges holes, shapes concave arcs, and cleans curved slots. It is a partner to the flat file for interior contours.

What is it used for?

• Enlarging round holes
• Shaping concave curves and slots
• Deburring internal edges

How to choose

Choose diameter to the hole and cut to the finish. A tapered round file fits holes already started; a blunt one cuts flat-bottom slots.

Anatomy

Understanding the parts of a round file helps you use, maintain, and buy it with confidence.

• Body: the main working portion of the tool
• Working end: the part that contacts the material
• Handle: the part you grip for control and leverage

Materials & construction

Quality round files are made from hardened, heat-treated steel (often chrome-vanadium or high-carbon) chosen for strength, edge retention, and resistance to wear and corrosion.

Safety & maintenance

• Wear safety glasses; metal chips and fragments are sharp
• Use the correct technique and pressure for the material
• Keep the tool clean and store it safely
• Fit a handle where the tool uses one to protect your hand

Also known as

rat-tail file, needle file