Kennametal 1937511 Boring Insert CDHB120605 KT315 Cermet

Product Description

The KENNAMETAL 1937511 is a cermet boring insert designed for precision internal turning and boring operations on CNC and manual lathes. Manufactured to the CDHB insert style in an 80-degree diamond shape, it carries the KT315 grade designation, which places it in the C3, C7, and C8 material grade categories. The insert measures 5/32 inches inscribed circle (0.156 inches decimal), 0.040 inches thick, with a 0.007-inch corner radius and a 15-degree relief angle. These geometry characteristics make it well-suited for finishing and semi-finishing passes where dimensional accuracy and surface finish are the primary objectives. Cermet construction provides a hard, wear-resistant cutting edge that maintains sharpness longer than standard carbide grades in certain steel and cast iron applications.

This insert is intended for use in boring bars and boring heads configured for the CDHB insert style. It is typically applied in production and job-shop environments where close-tolerance bores are required in ferrous materials including medium-carbon steels, alloy steels, and hardened steels within the appropriate hardness range for cermet grades. The compact inscribed circle size of 0.156 inches suits small-bore applications where tool access is limited. Machinists and toolroom technicians working on tight-tolerance components will find this insert appropriate for light finishing depths of cut.

Key Features

• CDHB insert style with 80-degree diamond shape for rigid, low-vibration cutting geometry
• KT315 cermet grade rated for C3, C7, and C8 material categories
• 0.007-inch corner radius suited for fine surface finish on finish boring passes
• 15-degree relief angle reduces rubbing and supports clean bore wall contact
• 0.156-inch inscribed circle for small-bore tooling setups
• 0.040-inch insert thickness provides a compact profile in tight boring bar pockets

Compatibility

Designed as a direct-fit replacement for boring bars and holders configured to accept the CDHB insert style with a Series C designation. Consult the boring bar manufacturer specifications to confirm pocket geometry and screw or clamp retention compatibility before installation.

Installation Notes

Installation should be performed by a qualified machinist or toolroom technician with the machine fully powered down and the spindle locked. Use the appropriate torque wrench and insert-seating tool recommended by the boring bar manufacturer to seat and secure the insert without over-torquing the clamping screw. Inspect the insert pocket for chips or debris before seating the new insert. Cermet inserts are brittle compared to carbide; avoid interrupted cuts, heavy feeds, or hammering the insert into the pocket.