Kennametal 1274656 Irsn Indexable Turning Shim Solid Carbide

Product Description

The KENNAMETAL 1274656 is a solid carbide shim designed for indexable turning toolholders. Shims seat beneath the insert to protect the toolholder pocket, maintain correct insert height, and provide a rigid, wear-resistant backing surface during metal cutting operations. This shim uses the IRSN style and is sized for square inserts with a 7.52 mm (0.296 inch) inscribed circle. At 0.315 inches thick, it delivers consistent seating depth across repeated insert changes. Solid carbide construction resists deformation under the high compressive loads generated in turning applications.

This shim is intended for use in turning operations on CNC lathes and manual turning centers where indexable square inserts are mounted in precision toolholder pockets. It is a maintenance and replacement component, consumed during routine insert changes or when the existing shim shows wear or damage from interrupted cuts, heavy feeds, or hard workpiece materials. Machinists and toolroom technicians working with IRSN-style toolholders will source this shim as a direct seat component.

Key Features

• IRSN shim style for compatibility with matching toolholder pocket geometry
• Sized for square indexable inserts with 7.52 mm inscribed circle
• 0.315 inch thickness provides consistent insert seating depth
• Solid carbide construction resists wear and compressive deformation
• Protects toolholder pocket from insert-edge contact and chip damage

Compatibility

Designed as an OEM-style replacement shim for IRSN-style indexable turning toolholders that accept square inserts with a 7.52 mm inscribed circle.

Installation Notes

Installation is performed by machining technicians during toolholder setup or insert change procedures. Always ensure the toolholder pocket and shim seating surface are clean and free of chips or debris before placing the shim. Inspect the shim for cracking or edge damage before reuse, as a damaged shim can compromise insert seating and cause premature insert failure. Follow the toolholder manufacturer torque specifications for the clamp or screw that secures the insert and shim assembly.