Accupro ACC-BBL200400 Boring Bar Solid Carbide Left Hand

Product Description

The ACCUPRO ACC-BBL200400 is a solid carbide boring bar designed for precision internal boring operations on lathes and turning centers. Built from submicron-grade carbide with a bright finish coating, this bar delivers consistent rigidity and wear resistance in tight-tolerance bores. It features a left-hand cutting direction, a minimum bore diameter of 0.2 inches, and a maximum bore depth of 0.4 inches. The 1/4-inch shank diameter and 2.5-inch overall length make it a compact, purpose-built tool for small-bore applications. Machinists and tool-and-die professionals reach for this bar when accuracy and surface finish in confined bore geometries are the priority.

This boring bar is suited for small-bore turning operations in both production shop and job shop environments. It is commonly used on CNC lathes and manual turning machines where bore diameters in the 0.2-inch range require a rigid, short-overhang solution. The left-hand cut orientation makes it appropriate for back-boring or specific tool-path configurations where a right-hand bar would not clear the workpiece or holder. The bright, uncoated carbide surface is well matched to non-ferrous metals, cast iron, and certain steels where coating adhesion or heat buildup is a concern.

Key Features

• Submicron solid carbide construction for high rigidity and edge retention in small-bore work
• Minimum bore diameter of 0.2 inches suits tight, precision bore applications
• Maximum bore depth of 0.4 inches in a compact 2.5-inch overall length
• Left-hand cutting direction for back-boring or reverse-pass tool paths
• 1/4-inch shank diameter for compatibility with standard small-bore tool holders
• Bright finish coating preserves sharp edge geometry and reduces built-up edge on non-ferrous materials

Compatibility

Designed as a direct-fit boring bar for standard 1/4-inch bore bar holders and cartridge-style tool blocks used on CNC and manual lathes requiring left-hand, small-bore capability.

Installation Notes

Installation should be performed by a qualified machinist following the machine tool manufacturer's tooling setup procedures. Ensure the machine spindle is fully stopped and the machine is in a safe, locked-out state before mounting or removing the bar. Set tool overhang to the minimum length needed for the bore depth to maximize rigidity and minimize deflection. Verify shank clamping torque with the tool holder manufacturer's specifications before cutting.