Hertel H59873794 Boring Insert TDHH1.280.751 HP520B Carbide

Product Description

The HERTEL H59873794 is a solid carbide boring insert designed for precision internal turning and boring operations on CNC lathes and boring bars. Manufactured to insert style TDHH with a 60-degree triangle shape, this insert carries a TiN coating applied via PVD process, which extends cutting edge life and reduces built-up edge in ferrous machining. It holds a C5 material grade rating and is sized at a 5/32-inch inscribed circle with a 3/64-inch thickness and a 1/64-inch corner radius. The 15-degree relief angle provides clearance suited for finishing and semi-finishing passes in tight bores. Installation is screw-held and right-hand oriented.

This insert is intended for use in boring and internal turning applications in metalworking environments, including job shops and production machining operations. The TDHH insert style fits compatible boring bar toolholders designed to accept screw-clamp triangle inserts with matching seat geometry. It performs in steels, cast irons, and similar materials within the C5 carbide grade range. The manufacturer catalog number for this insert is TDHH1280751R. This is a single-piece package sold in minimum order quantities of 10 units per order.

Key Features

• Solid carbide substrate with TiN coating via PVD process for extended edge life
• 60-degree triangle shape with 15-degree relief angle for clearance in internal bore applications
• 1/64-inch corner radius for controlled surface finish on finishing and semi-finishing cuts
• Screw-held insert holding method with right-hand orientation
• 5/32-inch inscribed circle and 3/64-inch thickness for TDHH-style toolholder seating
• C5 material grade suitable for machining steels and cast irons

Compatibility

Designed to seat in TDHH-style boring bar toolholders that accept screw-clamp triangle inserts with a 5/32-inch inscribed circle and 3/64-inch seat thickness. Verify toolholder pocket geometry and insert style code before installation.

Installation Notes

Installation is performed by qualified machinists or tooling technicians. Power down and lock out the machine spindle before changing inserts. Use the appropriate torque driver for the clamping screw to avoid seat distortion or screw failure — refer to the toolholder manufacturer torque specification for the correct value. Inspect the insert pocket and seating surface for chips or debris before seating the insert.