Bastard File

What is it?

The bastard file has a medium-coarse cut that removes material fast while leaving a workable finish. It is a common first file for shaping and deburring metal, named for its cut grading rather than quality.

What is it used for?

• Rapid stock removal on metal
• Deburring and shaping edges
• Coarse shaping before finer files

How to choose

Choose the coarseness (cut) and shape to the job; a bastard cut is a good general start. Always file with a handle and push in one direction.

Anatomy

Understanding the parts of a bastard 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 bastard 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

double-cut file, hand file