Scientific Cutting Tools BB3112 Radial Relief Boring Bar

Product Description

The SCIENTIFIC CUTTING TOOLS BB3112 is a radial relief boring bar designed for internal turning and boring operations on CNC lathes and manual turning centers. Machined from submicron-grade solid carbide, it offers the rigidity and wear resistance needed for tight-tolerance bore finishing. The right-hand cutting direction and uncoated carbide construction make it well suited for a range of ferrous and non-ferrous materials. With a minimum bore diameter of 0.31 inches and a maximum bore depth of 1.25 inches, this bar handles small-diameter deep-reach applications where steel shanks would flex and chatter.

This boring bar is used in precision machining environments including job shops, production turning cells, and tool rooms. It is typically installed in standard boring bar holders or collet-style tool blocks on CNC lathes and turning centers. The 5/16-inch shank diameter fits common small-bore tooling systems. Applications include finish boring, back-spotfacing, and internal profile work on components such as hydraulic fittings, valve bodies, and small mechanical housings where bore geometry and surface finish tolerances are critical.

Key Features

• Submicron solid carbide construction for high rigidity and extended tool life
• Radial relief geometry reduces cutting forces and minimizes bore deflection
• Right-hand cutting direction for standard lathe boring setups
• 0.31-inch minimum bore diameter enables access to small-diameter bores
• 1.25-inch maximum bore depth supports deep-reach internal turning
• Uncoated finish maintains sharp edge geometry on the carbide substrate

Compatibility

Designed as an OEM-style replacement and standard tooling option for boring bar holders accepting a 5/16-inch shank diameter on CNC lathes and manual turning centers.

Installation Notes

This boring bar is installed and serviced by machinists and tooling technicians. Secure the shank fully in the boring bar holder or collet block, ensuring minimum overhang to reduce vibration. Power down and lock out the machine spindle before changing or adjusting tooling. Do not exceed the rated minimum bore diameter, as contact with the bore wall during entry can chip the carbide cutting edge.