TCT Blind-Hole Boring Bits

TCT Blind-Hole Boring Bits

Persistools TCT blind-hole boring bits are precision woodworking drill bits designed for drilling blind holes in furniture panels, engineered wood boards, and other woodworking materials.

Unlike through-hole boring bits, blind-hole bits are intended to create holes with a controlled depth rather than fully penetrating the board.

They are widely used in furniture manufacturing for applications such as:

• Dowel holes
• Connector holes
• Hardware installation
• Fitting holes
• Assembly holes
• Pre-drilling on unmarked panel surfaces
• General blind-hole machining in panel furniture production

Accurate Positioning on Solid Panel Surfaces

Blind-hole boring bits are commonly used where no pre-existing hole is available.

For this reason, the cutting head is designed with a center spur that helps locate the drilling point accurately before the main cutting edges engage.

This provides several advantages:

• Accurate drilling start
• Reduced wandering on smooth board surfaces
• Better hole-position control
• Stable entry into laminated and engineered panels
• More consistent blind-hole accuracy

Clean Entry with Reduced Chipping

In addition to the center spur, the drill head uses side cutting edges and outer peripheral cutters to open the hole gradually and cleanly.

This structure helps:

• Reduce top-edge breakout
• Improve hole-mouth finish
• Produce cleaner blind-hole walls
• Maintain smoother entry into the workpiece
• Improve overall hole quality

This is especially important in furniture production, where drilled holes often need to remain clean for assembly, fitting accuracy, and final appearance.

TCT Cutting Head Construction

The cutting head uses brazed tungsten carbide on a steel body.

This construction offers a practical combination of:

• Good wear resistance
• Stable cutting performance
• High productivity in board drilling
• Suitable toughness for repeated use
• Long service life in furniture panel machining

TCT blind-hole boring bits are suitable for common furniture materials such as:

• MDF
• Particleboard
• Plywood
• Melamine-faced boards
• Laminated panels
• Solid wood
• Engineered wood

Left-Hand and Right-Hand Rotation

As with other furniture boring bits, blind-hole bits are available in:

• Left-Hand Rotation — commonly marked in red
• Right-Hand Rotation — commonly marked in black

The correct rotation direction should be matched to the spindle arrangement of the boring machine.

Used Together with Through-Hole Boring Bits

Blind-hole boring bits and through-hole boring bits are often used together in furniture drilling operations.

Although many sizes correspond to each other, their working functions are different:

• Blind-hole boring bits are used for controlled-depth drilling on intact panel surfaces
• Through-hole boring bits are used for complete penetration or hole breakthrough

Persistools can supply both types in matching diameter ranges for complete furniture boring systems.

Standard and Custom Sizes

Blind-hole boring bits are available in many standard diameters and can also be customized according to:

• Hole diameter
• Drilling depth
• Working length
• Overall length
• Shank diameter
• Rotation direction
• Cutting geometry
• Machine spindle system
• Customer drawing or sample