Accupro B140250R Corner Radius Boring Bar Solid Carbide

Product Description

The ACCUPRO B140250R is a corner radius boring bar designed for precision internal machining operations. Built from submicron solid carbide with a bright finish, it delivers the hardness and wear resistance required for tight-tolerance bore work. The bar cuts right-hand and handles a minimum bore diameter of 0.14 inches with a maximum bore depth of 0.25 inches. The 3/16-inch shank diameter and 2-inch overall length make it suitable for compact setups on CNC lathes and manual turning equipment. Machinists and toolroom operators use this bar when a controlled corner radius is required at the bottom of a bore.

This boring bar is used in production and job-shop environments where interior corner geometry must be held to a defined radius. The corner radius range of 0.0050 to 0.0080 inches suits applications where sharp internal corners must be avoided to reduce stress concentration or meet a part drawing callout. It is installed in right-hand boring bar holders and is well suited to turning centers, engine lathes, and manual boring machines handling small-diameter work. Typical materials bored include ferrous alloys, aluminum, and harder non-ferrous metals where carbide tooling is the standard choice.

Key Features

• Submicron solid carbide construction for high hardness and wear resistance in demanding bore applications
• Corner radius range of 0.0050 to 0.0080 inches for controlled internal corner geometry
• Minimum bore diameter of 0.14 inches supports small-bore work common in precision components
• Maximum bore depth of 0.25 inches suits shallow internal features
• Bright finish coating provides visual inspection clarity and reduces built-up edge in certain materials
• Right-hand cutting direction compatible with standard right-hand boring bar tool holders

Compatibility

Designed for use in right-hand boring bar holders accepting a 3/16-inch shank diameter. Verify holder bore diameter and minimum bore diameter clearance before installation.

Installation Notes

Installation is performed by a machinist or toolroom technician. Ensure the machine spindle is fully stopped and the machine is in a safe, locked-out state before inserting or adjusting the boring bar. Secure the shank firmly in the tool holder with appropriate clamping force to prevent chatter and tool pullout during the cut. Do not exceed the maximum bore depth specification, as doing so increases deflection risk and can damage the tool or workpiece.