Sandvik Coromant RA390-102R38-17L Milling Cutter

Sandvik Coromant RA390-102R38-17L shoulder milling cutter, 4.000-inch outer diameter, is part of the Coromill 390 RA390 family designed for square shoulder milling. The kit includes a Parlec C50-15SM4 SM Holder (STDLET B) for secure mounting in compatible machines. Key specs include an axial width (APMX) of 0.618 inches, a lead angle (RMPX) of 0.30 degrees, a maximum cutting depth (DCON MS) of 1.500 inches, and a length of cut (LF) of 1.969 inches. The tool supports a maximum spindle speed (RPMX) of 12,600 revolutions per minute and features an axial clearance (AZ) of 0.059 inches. This combination is suited for precise shoulder milling where a 4.0" diameter cutter is required, offering stable engagement and predictable performance in high-precision milling applications.