Scientific Cutting Tools BB91 Radial Relief Boring Bar

Product Description

The SCIENTIFIC CUTTING TOOLS BB91 is a radial relief boring bar machined from submicron solid carbide for high-precision internal boring operations. Designed for right-hand cutting, it accepts a 1/8-inch shank diameter and carries an overall length of 1.5 inches. The BB91 handles a minimum bore diameter of 0.09 inches and a maximum bore depth of 0.125 inches, making it well suited for tight-tolerance small-bore work. The bright, uncoated finish preserves dimensional accuracy and allows machinists to monitor tool wear directly. This tool is installed and operated by CNC machinists and manual lathe operators working in precision machining environments.

The BB91 is used in small-bore internal turning and boring applications where tight clearances and precise radial relief geometry are required. It is particularly applicable in industries such as aerospace, medical device manufacturing, and precision instrument fabrication, where bore diameters under 0.1 inches demand rigid, high-hardness tooling. The submicron carbide grade provides the hardness and edge retention needed to hold close tolerances in ferrous and non-ferrous materials at these bore sizes.

Key Features

• Submicron carbide grade delivers superior hardness and edge retention for small-bore precision work
• Radial relief geometry reduces cutting forces and improves bore surface finish
• Right-hand cutting direction compatible with standard CNC and manual lathe setups
• Bright, uncoated finish maintains precise dimensional tolerances straight from the manufacturer
• Compact 1.5-inch overall length suits confined tooling envelopes and small-bore holders
• 1/8-inch shank diameter fits standard small-bore toolholders commonly found in precision machine shops

Compatibility

Designed as an OEM-style replacement or direct-use boring bar for 1/8-inch shank small-bore toolholders used in precision CNC turning centers and manual lathes performing internal boring operations.

Installation Notes

Installation is performed by qualified machinists or tooling technicians. The machine spindle must be fully powered down and locked out before mounting or removing the boring bar from the toolholder. Secure the 1/8-inch shank firmly in the holder to the toolholder manufacturer's specified clamping procedure to prevent tool pullout during cutting. Inspect the cutting edge under magnification before use, as submicron carbide is brittle and susceptible to chipping if mishandled during setup.