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TNMG Inserts
TNMG Inserts – Versatile Turning Inserts for Precision Machining
What Are TNMG Inserts?
TNMG inserts are triangular-shaped, negative-rake, double-sided turning inserts commonly used in CNC lathes for external and internal turning applications. The name TNMG is based on ISO insert nomenclature:
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T – Triangle shape (60° included angle)
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N – Zero relief angle (neutral)
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M – Tolerance class (medium)
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G – Chipbreaker and clamping system type
These inserts are especially popular due to their 6 cutting edges per insert (3 on each side), making them highly cost-effective while maintaining strength and rigidity in medium to heavy-duty turning operations.
Key Features of TNMG Inserts
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Shape: Equilateral triangle with 60° included angle
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Relief Angle: Neutral (0°), provides maximum edge strength
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Cutting Edges: 6 usable cutting edges per insert
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Material Compatibility: Suitable for a wide range of materials, including steel, stainless steel, cast iron, and some non-ferrous metals
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Common Chipbreakers: GM, MA, MP, PR, etc., for versatile applications
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Mounting: Designed to be used with clamp-type toolholders
Applications
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Roughing and Semi-Finishing: Especially efficient for medium to heavy turning
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External and Internal Turning: Can be used for both OD and ID machining
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High Productivity Environments: Ideal for operations requiring frequent indexing and long tool life
Material Grades and Coatings
TNMG inserts are available in a wide variety of carbide grades, as well as Cermet, CBN, and Ceramic for high-performance applications. Popular coatings include:
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CVD Coatings (TiCN, Al₂O₃, TiN) – Excellent wear resistance for high-speed machining
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PVD Coatings (TiAlN, TiN) – Better for lower temperatures and interrupted cuts
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Uncoated – For applications requiring sharp edges and minimal built-up edge
Why Choose TNMG Inserts from CNC Tools Depot?
At CNC Tools Depot, we offer a wide range of high-quality TNMG inserts that deliver precision, durability, and value. Whether you're machining alloy steel, stainless, or cast iron, our TNMG inserts come in various chipbreaker geometries and grades to match your exact application needs.
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Top-tier brands and aftermarket alternatives
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Competitive pricing and bulk discounts
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Technical support for insert selection and application
Popular TNMG Insert Variants Available:
Need Help Choosing the Right Insert?
Our technical experts are ready to help you choose the perfect TNMG insert for your application. Whether you're optimizing surface finish, tool life, or material removal rates, we provide tailored recommendations for your specific machining needs.
Browse our full selection of TNMG inserts today at CNC Tools Depot and maximize your shop’s efficiency with the right tools for the job.
Frequently Asked Questions
TNMG inserts are used for turning operations on CNC lathes. They are ideal for medium to heavy-duty cutting on materials like steel, stainless steel, and cast iron.
TNMG is an ISO code where: T = Triangle shape, N = 0° relief angle, M = Medium tolerance, G = Clamping/Chipbreaker type.
TNMG inserts are double-sided with 3 cutting edges per side, providing a total of 6 usable edges per insert.
TNMG inserts can machine a wide range of materials including alloy steel, stainless steel, cast iron, and some non-ferrous metals.
TNMG inserts are triangular with 60° angles and are typically used for finishing or light-to-medium cuts. CNMG inserts are square and more robust for roughing.
Common chipbreakers include GM, MA, MP, PR, and others - each designed for specific cutting depths, feeds, and materials.
Yes, TNMG inserts can be used for both external and internal turning, depending on the toolholder.
Yes, TNMG inserts come in CVD and PVD coatings like TiN, TiCN, TiAlN for enhanced performance based on speed and material.
Consider your material type, machine rigidity, cutting speed, depth of cut, and chip control requirements. Our team can help you select the best fit.
You can buy premium TNMG inserts online at CNC Tools Depot with fast shipping, expert support, and bulk order discounts.
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