Hertel H59875757 TPGH321 Boring Insert Solid Carbide

Product Description

The HERTEL H59875757 is a solid carbide boring insert designed for precision internal turning and boring operations on CNC and manual lathes. Manufactured to TPGH321 geometry with a 60-degree included angle triangle shape, this insert delivers consistent performance in tight-tolerance bore work. The bright, uncoated finish and C1 carbide grade make it well-suited for applications where edge sharpness and surface finish are critical. Key dimensional specs include a 3/8-inch inscribed circle, 1/8-inch thickness, and a 1/64-inch corner radius, providing a sharp, controlled cutting edge for finish boring passes.

This insert is used in boring bars and toolholders accepting TPGH-style inserts across light to medium-duty internal machining operations. It is appropriate for production shops and tool rooms handling ferrous and non-ferrous materials where an uncoated carbide edge is preferred over coated alternatives. The screw-holding method ensures secure clamping in compatible toolholders during continuous or interrupted cuts at standard cutting parameters.

Key Features

• Solid carbide construction, C1 material grade for consistent hardness and wear resistance
• Bright, uncoated finish preserves a sharp cutting edge for finish boring
• TPGH321 insert style with 60-degree triangle shape for versatile boring geometry
• 1/64-inch corner radius for controlled surface finish in precision bore applications
• Screw-holding method provides positive insert retention in compatible boring bars
• 3/8-inch inscribed circle and 1/8-inch thickness meet standard TPGH toolholder requirements

Compatibility

Designed as a direct-fit replacement for TPGH321-style boring inserts used in screw-clamp boring bars and toolholders accepting a 3/8-inch inscribed circle, 60-degree triangle insert.

Installation Notes

Installation is performed by qualified machinists or toolroom technicians. Always power down and lock out the machine before indexing or replacing inserts. Seat the insert fully against the pocket locating surfaces before tightening the clamping screw to the toolholder manufacturer's specified procedure. Inspect the insert pocket for chips or damage before seating a new insert to avoid premature edge failure.