TCT Step Boring Bits

TCT Step Boring Bits

Persistools TCT step boring bits are precision woodworking drill bits designed to create two different hole diameters in a single drilling operation.

The smaller cutting section forms the pilot or through hole, while the larger stepped section creates a recessed counterbore for bolts, connectors, dowels, screws, or other furniture hardware.

This allows the fixing component to sit below or flush with the panel surface, helping create a cleaner and more concealed furniture assembly.

Typical applications include:

• Furniture connector holes
• Concealed bolt recesses
• Dowel and fitting holes
• Cam and connector systems
• Cabinet assembly
• Panel furniture production
• Knock-down furniture
• Hidden fastening systems

Two Diameters in One Drilling Operation

The main feature of a step boring bit is its stepped cutting geometry.

Instead of drilling the small hole and large recess separately, one tool can complete both diameters in a single cycle.

This helps improve:

• Hole concentricity
• Position consistency
• Production efficiency
• Assembly accuracy
• Hardware fit
• Furniture appearance

For automated furniture production, reducing multiple drilling operations can also simplify machine programming and tool changes.

Recessed Holes for Hidden Hardware

Modern panel furniture often uses concealed connectors and fastening systems.

The larger step of the drill creates the recessed area required to hide or partially embed the fastening component inside the board.

This helps reduce exposed hardware and creates a cleaner finished surface after assembly.

Depending on the furniture design, the stepped hole can be used for:

• Bolt heads
• Connector sleeves
• Dowel fittings
• Furniture fasteners
• Special mounting hardware

TCT Cutting Edge Construction

The drill uses a precision steel body with brazed tungsten carbide cutting edges positioned at the working sections.

This construction provides:

• Good wear resistance
• Sharp cutting performance
• Steel-body toughness
• Stable repeated drilling
• Cost-effective production

TCT step boring bits are suitable for common furniture materials including:

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

Left-Hand and Right-Hand Rotation

As part of the furniture boring system, step boring bits can be supplied in:

• Left-Hand Rotation
• Right-Hand Rotation

Red and black color identification can be supplied according to standard woodworking boring-machine practice or customer requirements.

Standard and Custom Step Dimensions

Many furniture fittings use standardized hole combinations, so step boring bits are available in numerous common size combinations.

The tool can also be customized according to:

• Small-hole diameter
• Large recess diameter
• Step depth
• Working length
• Overall length
• Shank diameter
• Rotation direction
• Machine model
• Hardware specification
• Customer drawing or sample

This makes the tool suitable for both standard furniture fittings and proprietary connection systems.