Hertel 1000247 TNMG321R HT10 Carbide Turning Insert

Product Description

The HERTEL 1000247 is a solid carbide turning insert in the TNMG style, designed for precision external and internal turning operations on CNC and manual lathes. This insert features a 60-degree triangular shape with a neutral hand orientation, a 3/8 inch inscribed circle (IC), and a 1/64 inch corner radius. The bright, uncoated finish of the HT10 carbide grade makes it well suited for applications where coating would interfere with edge sharpness or where cutting temperatures are moderate. Insert thickness is 1/8 inch and overall length is 0.65 inches. It is held in the toolholder via clamp and pin retention. Machinists and CNC operators install this insert as a direct drop-in for compatible TNMG toolholders.

This insert is rated for use on workpiece material codes N and S as primary designations, covering non-ferrous metals and heat-resistant superalloys, with secondary compatibility across material codes K and M, which include cast iron and stainless steel. The HT10 grade with G-style chip breaker geometry makes it a practical choice for light to medium roughing and finishing passes in general turning applications on production floors and job shops. The 0.0156 inch corner radius supports good surface finish while maintaining edge strength at moderate depths of cut.

Key Features

• TNMG insert style with 60-degree triangle shape and neutral hand for versatile toolholder compatibility
• HT10 solid carbide grade, bright uncoated finish for sharp edge retention at moderate cutting speeds
• 3/8 inch (0.375 inch) inscribed circle with 1/8 inch insert thickness for stable seating in standard TNMG pockets
• 1/64 inch (0.0156 inch) corner radius for balanced surface finish and edge durability
• G-style chip breaker geometry suited to light roughing and finishing on non-ferrous, superalloy, cast iron, and stainless workpieces
• Clamp and pin holding method for positive, repeatable insert location in the toolholder pocket

Compatibility

Designed as an OEM-style replacement insert for standard TNMG toolholders accepting a 321 insert size code with clamp and pin retention. Verify toolholder pocket geometry, insert size code, and hand designation before installation.

Installation Notes

Turning inserts are installed and indexed by qualified machinists or CNC tool-setup technicians. Power down and lock out the machine spindle before changing or indexing inserts. Use the appropriate torque wrench and clamp hardware specified by the toolholder manufacturer — do not overtighten the clamp screw, as this can fracture the carbide insert. Inspect the toolholder pocket for chips or debris before seating the insert to ensure proper contact and accurate tool-tip location.