Hertel H59872861 Boring Insert Diamond 80 Degree HC620B

Product Description

The HERTEL H59872861 is a solid carbide boring insert designed for precision internal boring operations on lathes and boring bars. Manufactured to insert style CDHB with an 80-degree diamond shape, it carries an inscribed circle (IC) of 5/32 inch (0.1560 inches decimal) and a corner radius of 0.007 inches, making it suited for tight-tolerance finish boring. The insert is 0.040 inches thick with a 15-degree relief angle and is held in place by a screw-type clamping method. The HC620B grade features a CVD-applied multilayer coating sequence of TiN, TiC, TiCN, and TiN over a C7 solid carbide substrate, providing wear resistance across a range of workpiece materials.

This insert is intended for use in boring operations on machining centers, engine lathes, and CNC turning equipment. The 80-degree diamond geometry and 15-degree relief angle support light to medium finishing cuts in steel, cast iron, and similar machinable alloys. It is sized for toolholders and boring bar heads that accept the CDHB 1.20.60.5 insert configuration. Machinists and toolroom professionals working in production or job-shop environments will find this insert suited to dimensional finishing passes where edge sharpness and coating durability are critical.

Key Features

• 80-degree diamond insert shape (CDHB style) for precision boring
• Inscribed circle of 5/32 inch (0.1560 inches) for compatibility with CDHB-spec toolholders
• Corner radius of 0.007 inches for fine-finish boring applications
• 15-degree relief angle reduces cutting forces on finish passes
• CVD multilayer coating: TiN / TiC / TiCN / TiN over C7 solid carbide substrate
• Screw-mount insert retention for repeatable indexing

Compatibility

Designed as a direct-fit replacement for boring bars and toolholders accepting the CDHB 1.20.60.5 insert style with a 5/32 inch inscribed circle and screw-clamp retention.

Installation Notes

Installation should be performed by a qualified machinist or toolroom technician. Ensure the boring bar or toolholder pocket is clean and free of chips before seating the insert. Use the manufacturer-specified torque driver for the clamping screw to prevent insert movement or seat damage. Always disengage the spindle and verify the machine is in a safe state before indexing or replacing inserts.