Sandvik Coromant COROMILL Carbide Milling Insert, RCKT Style, Round, GC4240 Grade, Multi-Layer Coating, RCKT1204M0PH,0.187" Thick, 0.236" Corner Radius (Pack of 10)

The Sandvik Coromant RCKT GC4240 carbide indexable milling insert has a round shape, is available with a PM or PH chipbreaker, and provides good shock resistance without limiting wear resistance for medium or heavy machining of steel in difficult-to-average machining conditions. A combination of carbide and a thin multilayer coating of titanium carbon nitride (TiCN), aluminum oxide (Al2O3), and titanium nitride (TiN) applied through medium temperature chemical vapor deposition (MTCVD) offers toughness and security in demanding operations with or 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 positive insert is used with the CoroMill 200, a screw-style insert holding system for rough face milling and profiling with high chip-removal rates. The insert is available with a choice of either a medium-machining PM chipbreaker or a heavy-machining PH chipbreaker. The round shape provides the strongest cutting edge of all shapes. Round inserts have a variable lead angle that allows for the production of thinner chips as the depth of cut is reduced, which improves productivity. The insert has a hole in the center, eight cutting edges, and a 7-degree clearance angle.

Milling inserts are coded according to their specific cutting and application capability (e.g., RCKT 12 04 M0-PM). Each section of the code represents details of the insert: shape, clearance angle, insert tolerances, combination of chipbreaker and clamp type, cutting edge length, insert thickness, M0 for metric inserts or 00 for U.S. version inserts, and chipbreaker style. Tolerance of the theoretical diameter of the insert ranges from + or - 0.002€ to 0.004€. 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 angles, 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 and represented in 130 countries, the company manufactures tools used throughout the metalworking field, including the automotive and aerospace, die and mold, and general engineering industries.

These inserts are used with the Sandvik Coromant CoroMill 200, a screw-style insert holding system for rough face milling and profiling. When used with the RCKT insert, the CoroMill 200 has strong cutting edges and high chip-removal rates. It performs well in unstable environments and requires a rigid setup and secure workpiece clamping.