Scientific Cutting Tools HB90A Helical Boring Bar Solid Carbide

Product Description

The SCIENTIFIC CUTTING TOOLS HB90A is a helical boring bar designed for tight-tolerance internal turning and bore finishing operations in metalworking applications. Constructed from submicron-grade solid carbide and finished with an AlTiN+ coating, this bar delivers consistent performance in hardened and abrasive workpiece materials. The right-hand cutting direction suits standard CNC and manual lathe setups. With a minimum bore diameter of 0.09 inches and a 0.125-inch shank diameter, the HB90A is built for small-bore work where rigidity and runout control are critical. Overall length is 1.5 inches, keeping the tool compact for close-tolerance setups.

The HB90A is intended for machinists and tool-and-die professionals performing small-bore internal turning, back-boring, or finishing passes on precision components. It is suited for use in CNC machining centers, Swiss-type lathes, and manual turning equipment where a 0.125-inch shank toolholder is available. Maximum bore depth reaches 0.5 inches, making it appropriate for shallow bores in mold components, hydraulic fittings, medical device parts, and similar precision workpieces. The AlTiN+ coating supports dry or minimal-lubrication cutting in ferrous and non-ferrous materials.

Key Features

• Submicron solid carbide construction for rigidity and resistance to wear in abrasive materials
• AlTiN+ finish coating enhances heat resistance and extends tool life in dry cutting conditions
• Right-hand helical geometry supports efficient chip evacuation in small-bore applications
• 0.09-inch minimum bore diameter allows entry into very small internal features
• 0.125-inch shank diameter compatible with standard small-bore toolholding systems
• 1.5-inch overall length keeps the setup compact and minimizes overhang-related deflection

Compatibility

Designed as an OEM-style replacement and direct-fit boring bar for toolholders accepting a 0.125-inch round shank in CNC and manual turning equipment.

Installation Notes

Installation should be performed by a qualified machinist following the toolholder manufacturer's clamping specifications. Ensure the machine spindle is fully stopped and all motion is locked out before changing or seating the boring bar. Confirm shank seating depth and runout with a dial indicator before taking the first cut. Avoid side-loading the bar beyond its rated bore depth of 0.5 inches to prevent premature tool breakage.