Kennametal TNU 544 K21 Triangular Carbide Inserts, Grade K21 5pcs

Kennametal TNU544 K21 Triangular Carbide Inserts — premium uncoated inserts for roughing and general-purpose turning in cast iron and nonferrous materials. Model: TNU544 Grade: K21 Manufacturer: Kennametal Inc. Country of Manufacture: USA Insert Type: Triangular, single-sided, negative rake Insert Dimensions: • Inscribed Circle (IC): 0.500 in (12.7 mm) • Thickness (S): 0.187 in (4.76 mm) • Hole Diameter (D1): 0.203 in (5.16 mm) • Corner Radius (RE): 0.031 in (0.8 mm) Relief Angle: 0° (negative rake) Material: Fine-grain tungsten carbide Coating: Uncoated (polished finish) Grade K21 Characteristics: • Medium-grain carbide for general-purpose and roughing operations • Excellent toughness with moderate wear resistance • Suitable for interrupted or heavy-duty cuts • Performs well on cast iron, bronze, and nonferrous metals ISO Range: K20–K30 Recommended Cutting Speed: • Cast Iron: 500–1000 SFM (150–305 m/min) • Bronze/Brass: 700–1400 SFM (215–425 m/min) Feed Rate: 0.006–0.018 in/rev (0.15–0.45 mm/rev) Depth of Cut: Up to 0.250 in (6.35 mm) Mounting: Compatible with TNU-style toolholders using screw or clamp system Color: Metallic gray Quantity: 5 inserts per pack Applications: • Roughing and general turning of cast iron and nonferrous alloys • Suitable for moderate feed rates and interrupted cuts • Ideal for CNC and manual lathe operations Please review pictures carefully and let us know if you have any questions!