Sandvik Coromant AUTO MILLING Carbide Milling Insert, TNEF Style, Triangle, K20D Grade, Multi-Layer Coating, TNEF1204ANKM,0.187″ Thick, 0.0787″ Corner Radius (Pack of 10)

The Sandvik Coromant TNEF K20D neutral-hand carbide indexable milling insert has a triangle shape with six cutting edges and a KM chipbreaker, and provides a balance of resistance to shock and wear for medium machining of cast iron in average machining conditions. K20D grade is a combination of carbide and a thin multilayer coating of titanium carbon nitride (TiCN) and aluminum oxide (Al2O3) applied through medium temperature chemical vapor deposition (MTCVD), that performs well at high cutting speeds and is used mainly without coolant. MTCVD coatings are deposited at lower temperatures than chemical vapor deposition (CVD) coatings, resulting in the appearance of few or no cracks in the coating and providing improved toughness and smoothness compared to CVD coatings.
This negative double-sided insert is used with the Sandvik Auto 260.3 and 260.31 roughing face mills, which are spring-clamp insert holding systems for face milling. The insert has a KM chipbreaker for medium machining. It has a triangle shape, a 45-degree parallel land for strength, and six cutting edges.
Milling inserts are coded according to their specific cutting and application capability (e.g., TNEF 12 04 AN-KM). Each section of the code represents details of the insert: shape, clearance angle, insert tolerances, clamp type, cutting edge length, thickness, parallel land and clearance angle, and chipbreaker style. Tolerance of the inscribed circle (iC) of the insert is + or – 0.001”. Insert thickness tolerance is + or – 0.001”. Insert shapes and sizes may have different inscribed circle (iC) measurements, which relate to ranges of cutting depths, speeds, lead angle, and feed rates. The iC is the largest circle that can be drawn within the edges of the insert shape. Generally, as the insert size and the iC become larger, the maximum cutting depth increases. Cutting depth influences the metal removal rate, the number of cuts, chip evacuation efficiency, and power required when using the insert. Indexable inserts are small cutting tools designed to remove material in external and internal cutting applications such as turning, milling, drilling, and grooving. They are held by an insert holder, have multiple cutting edges, and can be rotated when one edge wears down. Multiple inserts can accomplish a variety of cuts in one operation. An insert is either positive or negative, which refers to the rake or clearance angle at which the insert removes material.
Sandvik Coromant produces tools for turning, milling, and drilling. Headquartered in Sweden, the company manufactures tools used throughout the metalworking field, including the automotive and aerospace, die and mold, and general engineering industries.
Matching Inserts to Holders
These inserts are used with the Sandvik Coromant Auto 260.3 and 260.31 roughing face mills, which are spring-clamp insert holding systems used in roughing applications. When used with the Sandvik Auto, the insert has a 45-degree lead angle and 45-degree entering angle that provides a good balance of radial and axial cutting forces, and produces thin chips for high feeds with moderate cutting edge load.