Scientific Cutting Tools BB256 Radial Relief Boring Bar

Product Description

The SCIENTIFIC CUTTING TOOLS BB256 is a radial relief boring bar machined from submicron solid carbide for precision internal diameter work. It features a right-hand cutting direction and accepts a 0.25-inch shank diameter, making it compatible with standard boring bar holders used on lathes and machining centers. The minimum bore diameter is 0.248 inches, the maximum bore depth is 0.75 inches, and the overall length is 2 inches. The uncoated submicron carbide grade delivers fine-grain hardness and edge retention suited to close-tolerance boring applications. Machinists and toolroom technicians specify this bar for small-diameter, shallow-bore operations where rigidity and dimensional accuracy are critical.

This boring bar is suited for small-bore internal turning operations on CNC lathes, manual engine lathes, and mill-turn centers. Typical applications include finishing bores in ferrous and non-ferrous workpieces where surface finish and dimensional tolerance are tight. The right-hand cutting direction is standard for conventional lathe setups with the tool mounted on center. At 2 inches overall length and a 0.25-inch shank, the bar fits compact toolholding systems commonly used in production and toolroom environments. It is sold individually and is appropriate for professional machining operations requiring repeatable bore geometry.

Key Features

• Submicron solid carbide construction for high hardness and edge stability in precision boring
• Minimum bore diameter of 0.248 inches enables work in very small internal diameters
• Maximum bore depth of 0.75 inches suits shallow through and blind bore applications
• Right-hand cutting direction for standard lathe and machining center setups
• Uncoated finish preserves sharp edge geometry on the ground carbide cutting tip
• 0.25-inch shank diameter fits widely available boring bar toolholders

Compatibility

Designed as a direct-fit replacement or production boring bar for toolholding systems accepting a 0.25-inch shank diameter. No specific compatible machine models were identified in the product data.

Installation Notes

Installation is performed by a qualified machinist or toolroom technician. Ensure the machine spindle is fully stopped and the machine is powered down before mounting or removing the boring bar. Clamp the 0.25-inch shank securely in the toolholder and verify the cutting tip is set on center before commencing a cut. Refer to the machine manufacturer's toolholding torque and overhang recommendations to minimize vibration and maintain bore geometry.