Hertel H59873752 Boring Insert Triangle Tin Solid Carbide

Product Description

The HERTEL H59873752 is a solid carbide boring insert designed for precision internal boring operations on CNC and manual lathes. Manufactured to insert style TDHH, this left-hand insert features a 60-degree triangular shape with a 15-degree relief angle and a TiN coating applied via PVD process. The HP520B grade carbide substrate with C5 material classification makes it suitable for finishing and semi-finishing cuts in ferrous materials. With a corner radius of 0.015 inches and a thin 0.047-inch profile, it delivers sharp, controlled cutting action in tight-tolerance bores. Machinists and toolroom operators working with precision boring heads will find this insert a direct-fit replacement or complement to existing TDHH-style toolholders.

This insert is used in internal boring applications on CNC turning centers, manual lathes, and dedicated boring machines. Its left-hand orientation suits specific boring bar and toolholder configurations where right-hand inserts are not applicable. The 5/32-inch inscribed circle and screw-type holding method are standard for compact boring heads used in both production and job-shop environments. Typical applications include finishing bores in steel, cast iron, and similar ferrous workpieces where dimensional accuracy and surface finish are critical.

Key Features

• Solid carbide construction with HP520B grade and C5 material classification for wear resistance in ferrous cutting
• TiN coating via PVD process for improved surface hardness and lubricity
• 60-degree triangular shape (TDHH insert style) with 15-degree relief angle for clearance in internal bores
• Left-hand cutting orientation for compatibility with specific boring bar configurations
• Screw-type insert holding method for secure, repeatable clamping
• Corner radius of 0.015 inches for controlled surface finish on finishing passes

Compatibility

Designed for use with TDHH-style boring bars and toolholders that accept a triangular insert with a 5/32-inch inscribed circle and screw-type clamping. Catalog reference number TDHH1280751L. Sold individually; minimum order quantity is 10 units.

Installation Notes

Insert installation should be performed by a qualified machinist or toolroom technician. Ensure the boring bar and machine spindle are fully powered down and locked out before seating or removing inserts. Use the appropriate torque wrench and insert screw driver to secure the clamping screw without over-torquing, which can fracture the carbide. Verify insert orientation and hand designation match the toolholder before commencing cuts.