Kennametal 1152724 Indexable Boring Bar 3/8 Inch Shank

Product Description

The KENNAMETAL 1152724 is a solid carbide indexable boring bar designed for internal turning and boring operations on CNC lathes and turning centers. Built to the E-MSCLP toolholder style, it features a right-hand cut orientation and a neutral rake angle of 0 degrees. The 3/8 inch (9.53 mm) shank diameter pairs with a 6.0 inch (152.4 mm) overall length to reach a minimum bore diameter of 0.480 inch (12.19 mm). A screw-type insert clamping method secures CP-style inserts firmly during interrupted and continuous cuts. Coolant-through capability via a 0.125 inch internal coolant hole supports chip evacuation and tool life in deep bore applications. Licensed machinists and CNC tool-crib technicians are the primary users of this toolholder.

This boring bar suits precision internal diameter finishing and semi-finishing in small-bore applications where rigidity and dimensional accuracy are critical. The solid carbide body resists deflection better than steel-shanked alternatives in short-overhang setups. With a -5 degree lead angle and a 1/4 inch insert inscribed circle, it is well matched to tight-tolerance bores in ferrous and non-ferrous workpiece materials. It is used in job shops, aerospace, medical, and automotive precision machining environments where repeatable bore geometry is required.

Key Features

• Solid carbide body for maximum rigidity and minimal deflection in small-bore operations
• Right-hand cut, E-MSCLP toolholder style with neutral rake (0 degrees)
• Screw clamp insert retention for secure, repeatable CP-style insert indexing
• Coolant-through design with 0.125 inch coolant hole for chip evacuation and thermal management
• -5 degree lead angle with 0.250 inch center-to-cutting-edge measurement for controlled entry geometry
• 3/32 inch insert thickness compatibility with 1/4 inch inscribed circle CP inserts

Compatibility

Designed to accept CP-style inserts with a 1/4 inch inscribed circle and 3/32 inch thickness, secured by screw clamping. Confirm insert geometry and grade selection against the workpiece material before installation.

Installation Notes

Installation is performed by qualified CNC machinists or toolroom technicians. Ensure the machine spindle is fully stopped and all stored energy is released before changing tooling. Torque the insert clamping screw to the insert manufacturer's specification using the appropriate Torx or hex key — do not overtighten. Verify shank-to-holder bore fit and runout with a dial indicator before taking the first cut to confirm proper seating.