Hertel H59875864 TPGH322 Boring Insert Solid Carbide Tin

Product Description

The HERTEL H59875864 is a solid carbide boring insert designed for precision internal turning and boring operations on CNC and manual lathes. Manufactured to TPGH322 insert geometry, this insert features a 60-degree triangular shape with an 11-degree relief angle and a 1/32 inch (0.0310 inch) corner radius. The HP520B grade substrate is PVD-coated with TiN (Titanium Nitride), which extends cutting edge life and reduces built-up edge when machining steel and cast iron. The insert measures 3/8 inch inscribed circle and 1/8 inch thick, making it suitable for small-diameter boring bar applications. Installation is by screw-clamping (top-clamp screw method). Machinists and CNC operators working in job shops, aerospace component production, and general metalworking will find this insert suited to finishing and semi-finishing cuts.

This insert is used in boring bars and turning tool holders that accept TPGH-style triangular inserts with a screw-on clamping method. It is appropriate for internal diameter boring, light turning, and profiling operations on ferrous materials. The TiN PVD coating and C5 carbide grade make it well-suited for continuous cuts on steel, alloy steel, and cast iron at moderate cutting speeds. Typical applications include finishing passes on bearing bores, hydraulic cylinder interiors, and precision-fit housings where consistent surface finish and dimensional accuracy are required.

Key Features

• TPGH322 geometry: 60-degree triangular insert with 11-degree relief angle for positive cutting action
• HP520B grade solid carbide substrate rated at C5 material grade for steel and cast iron machining
• PVD TiN coating reduces friction and extends tool life in continuous cutting operations
• 1/32 inch (0.0310 inch) corner radius suited for finishing and semi-finishing passes
• Screw-on clamping method provides secure insert retention in compatible boring bar holders
• Compact 3/8 inch inscribed circle and 1/8 inch thickness for small-bore applications

Compatibility

Designed for use in boring bars and tool holders that accept TPGH-style triangular screw-on inserts with a 3/8 inch inscribed circle. Verify holder pocket geometry and clamping screw specifications before ordering.

Installation Notes

Insert replacement should be performed with the machine powered down and all spindle motion stopped. Use the correct torque wrench and insert clamping screw specified by the tool holder manufacturer — do not overtighten, as this can fracture the carbide insert. Inspect the insert pocket seat and clamping screw threads for wear or debris before seating a new insert. This product is sold individually (package quantity of 1) with a minimum order quantity of 10 units.