Drill Bit Sizes

Selecting the correct drill bit size is important for proper fastener fit, tapping, and hole accuracy in FRC fabrication.

Common FRC Drill Bit Sizes

Tap Drill vs. Clearance Drill

Tap Drill

A tap drill creates the correct size hole for cutting threads with a tap.

Example:

• A 10-32 screw uses a #21 drill bit before tapping.

Clearance Drill

A clearance hole allows a fastener to pass through freely.

Example:

• A 10-32 bolt typically uses a 13/64" clearance hole.

Best Practices

• Verify the required drill size before drilling.
• Use a center punch to prevent drill wandering.
• Deburr holes after drilling.
• Label commonly used bits to prevent mistakes.

Common Mistakes

• Using a clearance hole when tapping is required.
• Selecting the wrong drill bit size.
• Drilling oversized holes.
• Forgetting to deburr the finished hole.

Key Idea

Using the correct drill bit size ensures proper fastener fit, accurate hole placement, and reliable assemblies on an FRC robot.