Osg 455-6251 Square End Mill 5/8 Inch 5 Flute Carbide

Product Description

The OSG 455-6251 is a solid carbide square end mill designed for precision milling operations in ferrous and non-ferrous materials. It features a 5/8-inch cutting diameter, a 3/4-inch length of cut, and a 5-flute configuration with a 45-degree helix angle. The micrograin carbide substrate provides rigidity and edge retention suited to demanding cutting conditions. This is a single-end, center-cutting tool with right-hand cut and right-hand spiral fluting, making it compatible with standard CNC machining center spindles and manual knee mills. It ships uncoated and is part of OSG Series 455C.

This end mill is used in general-purpose and finishing milling applications including slotting, peripheral milling, and plunge cutting where center-cutting geometry is required. The 5-flute design increases chip load capacity and surface finish quality compared to standard 4-flute tools, making it a common choice for higher-feed finishing passes in steel, stainless, cast iron, and similar materials. The 5/8-inch shank diameter matches the cutting diameter for direct collet or end mill holder mounting without adapter bushings.

Key Features

• 5/8-inch cutting diameter with 3/4-inch length of cut for controlled depth engagement
• 5-flute spiral geometry supports higher feed rates and improved surface finish
• 45-degree helix angle reduces cutting forces and promotes smooth chip evacuation
• Center-cutting design allows direct plunge entry without pre-drilling
• Micrograin solid carbide construction for edge stability in hard and abrasive materials
• Uncoated finish suitable for use with cutting fluids or coolant in a range of workpiece materials

Compatibility

Designed as an OEM-style solid carbide square end mill in the OSG Series 455C family. Fits any machine spindle or toolholder accepting a 5/8-inch shank diameter, including ER collets, end mill holders, and Weldon-style holders of matching bore size.

Installation Notes

Installation should be performed by a qualified machinist or CNC setup technician. Ensure the spindle and toolholder are clean and free of chips before seating the shank to the correct insertion depth. Verify runout with a dial indicator before beginning a cut. Follow machine manufacturer torque specifications for set screws or collet nuts; do not exceed the toolholder rated axial holding force for this shank diameter.