Scientific Cutting Tools BB158 Radial Relief Boring Bar

Product Description

The SCIENTIFIC CUTTING TOOLS BB158 is a radial relief boring bar designed for precision internal diameter machining on lathes and boring mills. Built from submicron-grade solid carbide, this bar delivers the rigidity and wear resistance required for tight-tolerance bores in hard and abrasive workpiece materials. It cuts in a right-hand direction and handles a minimum bore diameter of 0.155 inches with a maximum bore depth of 1 inch. The 3/16-inch shank diameter and 2-inch overall length make it well suited for small-bore applications where reach and clearance are critical. Machinists and toolroom professionals specify this type of bar when consistent surface finish and dimensional accuracy are non-negotiable.

This boring bar is intended for small-diameter internal turning operations in production and toolroom environments. It is commonly used on CNC lathes, manual engine lathes, and boring mills where the minimum bore diameter falls in the 0.155-inch range. The uncoated submicron carbide construction performs effectively across a range of ferrous and non-ferrous materials. It is a single-piece solid carbide design, making it appropriate for applications where insert-style bars lack the stiffness needed at small bore diameters.

Key Features

• Submicron-grade solid carbide construction for superior hardness and edge retention in tight-tolerance bores
• Radial relief geometry reduces cutting forces and improves chip clearance in small-diameter bores
• Right-hand cutting direction for standard lathe and boring mill setups
• Minimum bore diameter of 0.155 inches suits precision small-bore work
• Maximum bore depth of 1 inch with a 3/16-inch shank diameter for stable reach
• Uncoated finish preserves sharp edge geometry out of the box

Compatibility

Designed as an OEM-style replacement or direct-use solid carbide boring bar for lathes and boring mills accepting a 3/16-inch shank diameter toolholder.

Installation Notes

Installation is performed by qualified machinists familiar with lathe or boring mill toolholding systems. Power down and lock out the spindle before seating or removing the bar from the toolholder. Ensure the shank is fully seated and clamped securely to minimize runout and chatter. Follow machine manufacturer torque guidelines for toolholder set screws when securing small-diameter shank tooling.