Hertel H59872879 Boring Insert 80 Degree Diamond Solid Carbide

Product Description

The HERTEL H59872879 is a solid carbide boring insert designed for precision internal diameter machining operations. Shaped as an 80-degree diamond, this insert carries the CDHB style designation and fits boring bars and toolholders configured for screw-type insert retention. It is manufactured from solid carbide at material grade C25 under the HERTEL grade classification HT310B. The uncoated finish suits applications where the carbide substrate performs best without additional coating treatment. Key dimensional specs include a 5/32-inch inscribed circle (0.1560 inches decimal), a 0.007-inch corner radius, and a 0.0400-inch thickness. A 15-degree relief angle supports clearance in tight bore profiles. Licensed machinists and toolroom technicians working on CNC lathes and boring mills are the primary installers of this insert.

This insert is suited for boring operations on a range of workpiece materials consistent with C25-grade solid carbide applications. The 80-degree diamond shape provides a relatively strong cutting edge with moderate nose angle, making it appropriate for both roughing and semi-finishing passes in internal bore work. The CDHB insert style and 5/32-inch inscribed circle size narrow the compatible toolholder pool to those specifically designated for CDHB geometry at the 1.20.60.5 size code. The uncoated carbide construction is typically selected for non-ferrous metals, cast iron, or situations where coating adhesion is not optimal.

Key Features

• 80-degree diamond insert shape (CDHB style) for strong cutting edge geometry in boring applications
• Solid carbide construction at material grade C25, manufacturer grade HT310B
• Uncoated finish suitable for specific workpiece materials where bare carbide outperforms coated alternatives
• 0.007-inch corner radius for controlled surface finish in internal bore passes
• 15-degree relief angle provides clearance in confined bore geometries
• Screw-type insert holding method for secure, repeatable seating in compatible toolholders

Compatibility

Designed for use in boring bars and toolholders accepting CDHB-style inserts at size code 1.20.60.5 with a 5/32-inch inscribed circle. Consult the toolholder manufacturer specifications to confirm insert pocket and screw retention compatibility before installation.

Installation Notes

Insert installation and indexing should be performed by a qualified machinist or toolroom technician with the machine spindle fully stopped and the machine locked out per applicable safety procedures. Use the appropriate torx or hex key to torque the clamping screw to the toolholder specification - refer to the toolholder manufacturer documentation for the correct value. Inspect the insert pocket and seating surfaces for chips or debris before seating the insert. Handle solid carbide inserts with care to avoid edge chipping prior to use.