Hertel H59874560 Boring Insert TPCG222 HP520B Carbide

Product Description

The HERTEL H59874560 is a solid carbide boring insert in the TPCG style, designed for precision internal turning and boring operations on CNC and manual lathes. The insert carries the HP520B manufacturer grade and features a physical vapor deposition (PVD) TiN coating for improved wear resistance and extended tool life at moderate cutting speeds. Key geometry includes a 60-degree included angle triangular shape, a 1/32-inch (0.0310-inch) corner radius, and an 11-degree relief angle. The 1/4-inch inscribed circle and 3/32-inch thickness place this insert in the standard TPCG222 size class. Installation is performed by a licensed machinist or toolroom technician using a screw-type insert holding method.

This insert is suited for boring and internal finishing applications in metals classified under carbide grade C5, which corresponds to general-purpose steel and cast-iron machining. The left-hand designation indicates it is configured for left-hand cutting tool holders using TPCG-style pockets. Typical use cases include finish boring of housings, cylinders, and bores where close dimensional tolerances and a controlled surface finish are required. Sold individually per package; a minimum order quantity of 10 applies.

Key Features

• Solid carbide substrate with PVD TiN coating for wear resistance in steel and cast-iron cutting
• TPCG222 geometry: 60-degree triangle, 11-degree relief angle, 1/32-inch corner radius
• Screw-type insert holding method for positive, repeatable seating in compatible toolholders
• Left-hand cutting configuration
• HP520B grade optimized for moderate-speed finish and semi-finish boring
• 1/4-inch inscribed circle diameter; 3/32-inch thickness (0.0960 inches decimal)

Compatibility

Designed for use in left-hand TPCG-style screw-on boring bar toolholders that accept a TPCG222 insert size with a 1/4-inch inscribed circle. Verify toolholder pocket geometry and relief angle requirements before installation.

Installation Notes

Insert replacement should be performed by a qualified machinist with the machine powered down and locked out per applicable machine-tool safety procedures. Use the correct torque wrench and insert screw specified by the toolholder manufacturer to seat the insert without over-torquing the clamp screw. Inspect the toolholder pocket for chips or wear before seating a new insert. Always confirm the cutting direction matches the left-hand configuration before resuming operation.