Ultra-dex 920-000-255 Boring Bar Left Hand Solid Carbide

Product Description

The ULTRA-DEX 920-000-255 is a solid carbide boring bar designed for internal turning operations on lathes and boring machines. With a minimum bore diameter of 0.76 inches and a maximum bore depth of 7 inches, this bar handles deep-reach applications where rigidity and vibration resistance are critical. The solid carbide construction provides the stiffness needed to maintain dimensional accuracy at extended depths. The left-hand cutting orientation suits specific spindle directions and workpiece setups common in production and job-shop turning environments. Machinists and tool-and-die professionals are the primary users of this tooling.

This boring bar is suited for both production turning and prototype work where a 0.76-inch minimum bore diameter is required. The 5/8-inch shank diameter fits standard boring bar holders and quick-change toolpost systems. The 7-inch overall length combined with the 7-inch maximum bore depth makes this tool appropriate for through-bore and deep-pocket operations in steel, cast iron, aluminum, and similar machinable materials. Left-hand orientation should be confirmed against machine spindle direction and holder configuration before setup.

Key Features

• Solid carbide construction for high rigidity and reduced chatter at extended reach
• 0.76 inches minimum bore diameter for small-to-mid-range internal turning
• 7 inches maximum bore depth for deep-reach applications
• 7 inches overall length (OAL)
• Left-hand cutting orientation
• 5/8 inches shank diameter for compatibility with standard boring bar holders

Compatibility

Designed as an OEM-style replacement and direct-fit boring bar for standard 5/8-inch boring bar holders and quick-change toolpost systems used in lathe and boring machine setups.

Installation Notes

Installation is performed by qualified machinists in lathe or boring machine applications. Ensure the machine spindle is fully stopped and locked out before securing or removing the boring bar from its holder. Verify that the left-hand cutting direction matches the spindle rotation and workpiece fixturing of your specific machine. Use appropriate torque on clamping screws per the toolholder manufacturer specifications and confirm tool stick-out does not exceed recommended depth-to-diameter ratios for the workpiece material.