Hertel H59874156 Boring Insert TPCB221 HT630B Cermet

Product Description

The HERTEL H59874156 is a cermet uncoated boring insert designed for precision internal turning and boring operations on CNC and manual lathes. Formed in a 60-degree triangle (TPCB) geometry, this insert seats via screw-lock holding and delivers consistent performance in finishing and semi-finishing applications. Key dimensional specs include a 1/4 inch inscribed circle, a 3/32 inch thickness, and a 1/64 inch corner radius. The HT630B cermet grade is suited for high-speed finishing of steel and cast iron where surface finish and edge retention matter. Machinists and toolroom technicians are the primary users of this insert type.

This insert fits boring bar holders and cartridges configured for TPCB-style triangular inserts with screw-lock clamping. It is appropriate for light to moderate material removal on ferrous metals including carbon steel and alloy steel, particularly where close tolerances and fine surface finishes are required. The uncoated cermet construction performs well at elevated cutting speeds and maintains a sharp, consistent edge profile across production runs. Typical applications include bore finishing on housings, cylinders, and precision-machined components in manufacturing and job shop environments.

Key Features

• TPCB221 insert style with 60-degree triangular geometry for versatile boring applications
• HT630B cermet grade, uncoated, optimized for high-speed finishing of steel and cast iron
• 1/4 inch inscribed circle and 3/32 inch thickness for compact boring bar compatibility
• 1/64 inch (0.0150 inch) corner radius for fine surface finish requirements
• 11-degree relief angle reduces cutting forces and minimizes workpiece deflection
• Screw-lock insert holding method ensures repeatable seating and quick indexing

Compatibility

Designed for use in boring bar holders and cartridges that accept TPCB-style triangular inserts with a 1/4 inch inscribed circle and screw-lock clamping. Verify holder pocket geometry and insert size code 221 compatibility before installation.

Installation Notes

Insert installation should be performed by a qualified machinist or toolroom technician. Power down and lock out the machine before indexing or replacing inserts. Use the appropriate torque wrench and insert screw for the holder manufacturer's specified clamping torque — do not overtighten, as cermet inserts are brittle and susceptible to fracture under excessive clamp force. Inspect the insert pocket and clamping screw for wear or debris before seating a new insert.