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tnma insert

TNMA insert

TNMA insert angle: 60°Triangle carbide insert; 0° Negative Rake Insert and double-sided no chipbreaker;

Breaker Application: cast iron machining;

TCMA insert inscribed circle (IC) of 9.525mm/12.7mm, thickness of 4.76mm, and corner (nose) radius of 0.4mm/0.8mm/1.2mm/1.6mm;


TNMA Insert can deal with multiple operations by combining different grades;

Material : Tungsten Carbide;

Product Introduction

TNMA insert is a triangular 60° angle without chipbreaker specially designed for hard material machining, mainly used in cast iron machining, with good triangular stability, the negative type insert can effectively utilise 6 cutting edges, economical and efficient.

TNMA insert Specification

TNMA Designation

  • T: Triangular shape.
  • N: Negative rake angle (provides stronger cutting edge).
  • M: Tolerance class (indicates precision of inscribed circle and thickness). Typically +/- 0.13mm.
  • A: With cylindrical hole, without chipbreaker.

Common TNMA Dimensions

Similar to TCMT inserts, TNMA inserts use numbers to signify size:

  • TNMA 33X:

    • Inscribed Circle (IC): 0.375″ (3/8″)
    • Thickness: 0.125″ (1/8″)
    • X represents nose radius in sixteenths of an inch (e.g., 1 = 1/32″)
  • TNMA 43X:

    • Inscribed Circle (IC): 0.5″ (1/2″)
    • Thickness: 0.188″ (3/16″)
    • X represents nose radius

TNMA insert holder

turning tool holder
turning tool holder
turning tool holder
turning tool holder
turning tool holder



TNMA carbide Insert Dimensions (ISO and ANSI)

TNMA160404TNMA 33116.59.5254.763.810.4
TNMA160412TNMG 33316.59.5254.763.811.2

Example: TNMA 432

  • T: Triangular
  • N: Negative rake angle
  • M: Tolerance class
  • A: 60° included angle
  • 4: Inscribed circle of 0.5″ (1/2″)
  • 3: Thickness of 0.188″ (3/16″)
  • 2: Nose radius of 0.0625″ (1/16″) – good for general purpose work

The Science Behind Carbide Inserts: How They're Made and Why They're So Strong

Carbide inserts are some of the most versatile and durable cutting tools available. But how are they made? And what makes them so strong? In this video, we’ll explore the science behind carbide inserts, from the properties of tungsten carbide to the manufacturing process.

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