Hertel H59873174 Boring Insert CDHH1.20.61 HT540B Solid Carbide

Product Description

The HERTEL H59873174 is a solid carbide boring insert designed for precision internal turning and boring operations on CNC and manual lathes. It carries the CDHH insert style designation with an 80-degree diamond shape and a 15-degree relief angle, making it well suited for general-purpose boring where clearance and edge sharpness are critical. The insert is left-hand oriented and features a bright, uncoated finish, meaning it runs without a coating layer that could affect dimensional tolerances on fine cuts. A 1/64-inch corner radius and a 5/32-inch inscribed circle place this insert in the small-diameter boring category. Machinists and toolroom professionals install this insert into compatible HERTEL boring bar holders using a screw-holding method.

This insert is used in metalworking environments where precise bore geometry is required on ferrous and non-ferrous workpieces. Its C1 material grade and uncoated carbide surface make it a practical choice for finishing passes or light interrupted cuts in steel, cast iron, and similar materials. The CDHH style and 1.20.61 size code are standard designations that guide selection of the matching boring bar body. Applications include production shops, toolrooms, and maintenance machining operations where tight bore tolerances must be held consistently.

Key Features

• 80-degree diamond shape with 15-degree relief angle for clearance in tight bore profiles
• Solid carbide construction, material grade C1, manufacturer grade HT540B
• Bright uncoated finish for reduced built-up edge on finishing cuts
• Left-hand insert orientation for corresponding left-hand boring bar holders
• Screw-holding method for secure, repeatable insert seating
• 1/64-inch corner radius for fine surface finish on bore walls

Compatibility

Designed for use in boring bar holders accepting CDHH-style inserts with a 1.20.61 size code and screw-holding retention. Verify holder hand orientation and pocket geometry before installation.

Installation Notes

Installation should be performed by a qualified machinist or toolroom technician familiar with indexable carbide insert tooling. Power down and lock out the machine spindle before seating or replacing any insert. Use the appropriate Torx or hex key to tighten the clamp screw to the tool manufacturer's recommended method - do not overtighten, as carbide inserts are brittle and can fracture under excessive clamping force. Inspect the insert pocket and seating surface for chips or debris before installing a new insert.