CNC Tool Holder Double-edged Boring Cutter Bar for BT40 BT50 Spindles

This double-edged rough boring hole cutter bar is engineered for use in CNC machining centres, offering a practical solution for enlarging existing holes with improved precision and efficiency. Its twin-edged design helps distribute cutting forces more evenly compared to single-point tools, which can reduce vibration and improve hole straightness in steel, aluminium, and other metals. The holder is available in multiple BT taper and length combinations to match common spindle types and workpiece depths.

Features and Construction

The tool holder is built for industrial machining environments, with a focus on rigidity and repeatability. Each variant uses a pop rivet style boring shank design for secure clamping within the chuck.

Double-edged Design

Two cutting edges engage the workpiece simultaneously, balancing radial forces. This configuration helps minimise deflection and produces a more consistent bore surface during roughing passes. It also allows for higher metal removal rates compared to single-edged alternatives.

Material and Hardness

The holder body is made from steel, providing the structural stiffness required for interrupted cuts and heavy stock removal. Specific hardness ratings are available by contacting customer service, ensuring the tool can be matched to the intended application and workpiece material.

Available Specifications

Six variants are offered: BT40-BST-100L, BT40-BST-150L, BT50-BST-100L, BT50-BST-150L, BT50-BST-200L, and BT50-BST-250L. The number indicates the BT taper size (40 or 50) and the extension length in millimetres (100, 150, 200, or 250). Choose the combination that best fits your machine’s spindle and the depth of the hole you need to bore.

Uses and Placement

This boring tool is intended for use in CNC milling machines with BT40 or BT50 spindle tapers. It is commonly employed in automotive, aerospace, and general engineering workshops for enlarging cored or drilled holes to precise diameters before finishing operations.

Rough Boring Applications

The double-edged configuration makes this holder particularly suited for rough boring passes. By removing the majority of material in a single pass, it prepares the bore for a finishing tool while reducing overall cycle time. The balanced cutting action helps maintain hole location and reduces the risk of chatter.

Machine Compatibility

The BT40 and BT50 tapers conform to standard machine tool interfaces, allowing direct mounting in compatible spindles. The 100L to 250L extensions provide clearance for deep recesses or components with complex geometries. Always ensure the tool’s length does not exceed the machine’s Z-axis travel limits.

Benefits and Buying Value

Choosing a high-precision boring holder supports consistent machining results part after part. The double-edged design enhances chip evacuation and reduces the load on the spindle, contributing to longer tool life when maintained correctly.

Rigidity and Precision

Steel construction combined with a secure pop rivet boring shank interface minimises runout and deflection. This rigidity translates to better diameter control and surface finish during rough boring cycles, reducing the need for multiple finishing passes.

Versatile Length Options

With lengths ranging from 100mm to 250mm, the holder can be selected to match the depth of bored holes without excessive overhang. Shorter holders offer greater stiffness for shallow workpieces, while longer versions reach deeper cavities without sacrificing positioning accuracy.

Why Choose This Tool Holder

If your shop regularly machines holes requiring enlargement, this double-edged holder provides a dependable option for rough boring operations. The availability of multiple BT sizes and lengths ensures compatibility with a wide range of CNC machines and part dimensions. Contact customer service for hardness specifications if they are critical to your specific cutting conditions.