Hertel H59873737 Boring Insert TDHH1.280.75.0.5 HT540B

Product Description

The HERTEL H59873737 is a solid carbide boring insert designed for precision internal turning and boring operations on CNC and manual lathes. Manufactured to TDHH insert style specifications with a size code of 1.280.75.0.5, this insert features a 60-degree triangular geometry and carries the HT540B grade designation, indicating an uncoated solid carbide substrate suited for ferrous and non-ferrous machining where coatings are not required. The insert measures 0.0469 inches thick with a 0.1600-inch inscribed circle and a 0.0070-inch corner radius, providing tight tolerances for fine boring work. It is held in the tool body by screw clamping and is ground for right-hand cutting direction.

This insert is intended for use in boring bars and internal turning holders that accept TDHH-style inserts. It is suited for finish and semi-finish boring passes in production and job-shop environments where dimensional accuracy is critical. The 15-degree relief angle and 60-degree included angle make it appropriate for applications requiring clean, consistent surface finish in small-diameter bores. Machinists and CNC operators working with steel, cast iron, and similar materials in tight-tolerance bores will find this geometry well-suited to their application. Each package contains one insert; the minimum order quantity is 10 units.

Key Features

• Solid carbide construction with uncoated finish, material grade C1
• TDHH insert style with 60-degree triangular shape and 15-degree relief angle
• 0.0070-inch corner radius for fine boring and finish work
• 0.1600-inch inscribed circle diameter, 0.0469 inches thick
• Screw-on insert holding method for secure, repeatable seating
• Right-hand cutting orientation

Compatibility

Designed as an OEM-style replacement or standard cutting insert for boring bars and internal turning tool holders that accept TDHH-style screw-on inserts with a 5/32-inch inscribed circle. Manufacturer catalog reference number is TDHH12807505R.

Installation Notes

Installation should be performed by a qualified machinist or tooling technician. Always power down and lock out the machine before changing inserts. Use the correct torque screwdriver or insert key specified by the boring bar manufacturer to seat the screw-clamp securely without overtightening. Inspect the insert pocket for chips or debris before seating the insert to ensure proper contact and prevent premature edge failure.