Hertel H59874784 Boring Insert TPCH221 Solid Carbide

Product Description

The HERTEL H59874784 is a solid carbide boring insert designed for precision metal-cutting operations in boring and turning applications. Built to the TPCH221 insert style, it features a 60-degree triangular shape with an 11-degree relief angle, a 1/4-inch inscribed circle, and a 3/32-inch thickness. The corner radius measures 1/64 inch (0.0150 inches), making it suited for finishing passes where tight tolerances and clean bore surfaces are required. Uncoated solid carbide construction in grade HT540B (material grade C1) provides consistent edge integrity on a range of workpiece materials. Installation is by screw-clamping method. Machinists and toolroom technicians are the primary installers of this insert.

This insert is used in boring bars and turning tool holders configured for TPCH-style triangular inserts. It is appropriate for light to medium finishing operations on ferrous and non-ferrous materials in CNC and manual machining centers. The uncoated solid carbide substrate performs well in applications where coated grades may chip or where re-grinding is part of the shop workflow. Minimum order quantity is 10 pieces; each package contains 1 insert.

Key Features

• Solid carbide construction, grade HT540B (C1 material grade), uncoated for consistent edge performance
• 60-degree triangular shape (TPCH221 style) with 11-degree relief angle
• 1/4-inch inscribed circle (0.2500 inches) for use in compatible TPCH-style boring bar holders
• Corner radius of 1/64 inch (0.0150 inches) suitable for fine-finish boring passes
• Screw-clamping insert holding method for secure, repeatable seating in holder
• Lightweight at 0.03 pounds per insert

Compatibility

Designed as an OEM-style replacement insert for tool holders and boring bars accepting TPCH221 triangular screw-clamp inserts with a 1/4-inch inscribed circle.

Installation Notes

This insert is installed by qualified machinists or toolroom technicians using the appropriate screw-clamp boring bar holder for TPCH-style triangular inserts. Always power down and lock out the machine spindle before changing inserts. Inspect the insert pocket and clamping screw for wear or contamination before seating the new insert. Handle carbide inserts carefully to avoid chipping the cutting edge prior to use.