Hertel H59874586 Boring Insert TPCG222 HT540B Solid Carbide

Product Description

The HERTEL H59874586 is a solid carbide, uncoated boring insert designed for precision internal turning and boring operations on CNC and manual lathes. Manufactured to TPCG222 insert geometry, it features a 60-degree triangular shape with an 11-degree relief angle and a 1/32-inch (0.031-inch) corner radius. The inscribed circle measures 1/4 inch (0.2500 inch) and the insert thickness is 3/32 inch (0.0960 inch). Carrying the HT540B manufacturer grade with a C1 material grade designation, this uncoated carbide insert is suited for machining cast iron and non-ferrous materials where a bare substrate provides optimal chip control and edge integrity. Installation is performed by machinists and toolroom technicians using screw-type insert clamping systems.

This insert is intended for use in screw-retained TPCG-style boring bars and insert toolholders configured for left-hand cutting direction. Typical applications include finish and semi-finish boring of bores, stepped features, and internal diameters in production machining environments. The solid carbide substrate and uncoated finish make it appropriate for dry or minimally lubricated cutting of cast iron, aluminum, and other non-ferrous workpiece materials where coating adhesion or thermal barrier properties are not required.

Key Features

• TPCG222 insert style with 60-degree triangular geometry and three usable cutting edges
• Solid carbide substrate, uncoated, C1 material grade for cast iron and non-ferrous applications
• 11-degree relief angle reduces cutting forces during internal boring passes
• 1/32-inch corner radius (0.031 inch) for controlled surface finish in finish-bore applications
• Screw-type insert holding method for secure, repeatable edge indexing
• Left-hand insert orientation for compatible left-hand boring bar toolholders

Compatibility

Designed as a drop-in replacement for TPCG222-style boring insert seats on screw-clamp boring bars and internal turning toolholders requiring a left-hand, 60-degree triangular insert with a 1/4-inch inscribed circle.

Installation Notes

Insert installation and indexing should be performed by a qualified machinist or toolroom technician. Power down and lock out the machine spindle before removing or seating the insert. Use the correct Torx or hex key to tighten the clamping screw to the toolholder manufacturer's specified torque; over-tightening can fracture the carbide substrate. Inspect the insert pocket and clamping screw for wear or debris before seating a new edge.