Hertel H59874099 Boring Insert TPCB221 HC620B Carbide

Product Description

The HERTEL H59874099 is a solid carbide boring insert designed for precision internal turning and boring operations on CNC and manual lathes. This TPCB-style triangular insert carries manufacturer grade HC620B and features a multilayer CVD coating — TiN, TiC, TiCN, and a final TiN topcoat — that improves wear resistance and tool life across a range of workpiece materials. The insert has a 60-degree included angle, a 1/4-inch inscribed circle (0.2500 inches), a 3/32-inch thickness (0.0960 inches), and an 11-degree relief angle. A 1/64-inch corner radius (0.0150 inches) supports fine-finish boring passes. The insert is held by screw clamp. Intended for use by machinists and toolroom technicians working in production or job-shop environments.

This insert fits boring bar holders and tooling systems that accept TPCB221 geometry inserts. Typical applications include finishing and semi-finishing of bores in steel, cast iron, and similar materials where a carbide grade C7 insert is appropriate. The CVD multilayer coating extends cutting tool life when machining at moderate to higher surface speeds. Sold individually per package with a minimum order quantity of 10 pieces. Suitable for shops running automated or manual boring cycles where consistent insert geometry and coating uniformity are required.

Key Features

• Solid carbide substrate with CVD multilayer TiN/TiC/TiCN/TiN coating for extended wear life
• TPCB221 insert style — 60-degree triangle geometry with screw-clamp holding method
• HC620B manufacturer grade, C7 material grade — suited for steel and cast iron boring applications
• 1/4-inch inscribed circle (0.2500 inches) and 3/32-inch thickness (0.0960 inches)
• 1/64-inch corner radius (0.0150 inches) for fine-finish boring passes
• 11-degree relief angle reduces cutting forces on internal bore surfaces

Compatibility

Designed as a replacement or production insert for boring bar holders and tooling systems accepting TPCB221 insert geometry with screw-clamp retention.

Installation Notes

Installation should be performed by a qualified machinist or toolroom technician. Ensure the boring bar and turret are fully powered down and the machine is in a safe, locked-out state before changing inserts. Use the appropriate torx or hex key for the clamp screw and seat the insert fully against all pockets before torquing. Inspect the insert pocket and clamp for chips or damage before each insert change to prevent premature edge failure.