When to choose a mortise bit

A mortise bit is suitable when you need to:

• produce a classic mortise and tenon joint,
• create a precise square hole,
• manufacture furniture or structural joints using traditional carpentry methods,
• produce identical joints in series with high precision.

If you only need a round hole, another type of drill bit is more suitable. A mortise bit is designed exclusively for use in a mortising machine.

How to choose the correct version

Mortise bits differ in two main parameters:

Direction of rotation – right-hand cutting or left-hand cutting

The choice depends on the rotation direction of your mortising machine.
Most machines use right-hand cutting versions, but you must verify the technical specifications of your specific machine.

An incorrect rotation direction results in poor cutting performance and rapid tool damage.

Shank size – 13 mm or 16 mm

The shank size must match the diameter and construction of your mortising machine.
This is not a universal size – always refer to the technical specifications of your specific machine.

How to work with mortise bits

Use mortise bits only in a suitable mortising machine.

Ensure precise machine setup

Correct adjustment of the guides, depth, and feed pressure is essential for joint quality.

Work progressively

A mortise is usually created by gradually removing material in individual steps. Do not attempt to remove all the material in a single pass.

Check the cutting edges

A dull tool increases resistance, heat generation, and reduces cutting quality.

Limitations and what to watch out for

Mortise bits are not intended for manual drilling or use outside a mortising machine.

An incorrect combination of rotation direction and machine can lead to tool damage.