Osg 5410511 Square End Mill 3/8 Inch 4 Flute Cobalt

Product Description

The OSG 5410511 is a cobalt square end mill designed for general-purpose milling operations in metal fabrication, tool-and-die, and machining environments. Built from M42 cobalt high-speed steel, it delivers increased hardness and heat resistance compared to standard HSS tooling. The cutting end carries a TiAlN coating, which reduces friction and extends tool life in ferrous and stainless materials. Key dimensions are 0.375 inches cutting diameter, 0.750 inches length of cut, and 2.5 inches overall length. The 4-flute, 30-degree spiral design balances chip evacuation with surface finish quality, making it a reliable production choice for machinists and tool-room technicians.

This end mill fits vertical and horizontal milling machines, CNC machining centers, and manual knee mills. It is suited for slotting, profiling, and peripheral milling in steel, cast iron, and high-temp alloys where a cobalt-grade tool is specified. The centercutting geometry allows direct plunge entry without a pre-drilled pilot hole, which adds versatility in die-sinking and pocket-milling applications. The single-end configuration is standard for tool holders requiring a straight 0.375-inch shank. Series 541 is an OSG production-grade lineup targeted at shop-floor volume use.

Key Features

• M42 cobalt steel construction for improved heat and wear resistance over standard HSS
• TiAlN coating reduces friction and extends tool life in ferrous materials
• Centercutting design allows direct plunge entry
• 30-degree right-hand spiral flutes promote efficient chip evacuation
• 4-flute configuration balances metal removal rate with finish quality
• Straight 0.375-inch shank fits standard ER and set-screw tool holders

Compatibility

Designed as an OEM-style replacement or direct-fit production end mill for milling applications requiring a 0.375-inch diameter, 4-flute, cobalt square end mill with a 0.375-inch straight shank. Part of OSG Series 541.

Installation Notes

Installation should be performed by a qualified machinist following standard tooling change procedures. Secure the shank fully within the tool holder to the minimum insertion depth specified by the holder manufacturer before tightening. Verify spindle speed and feed rate against the material being cut and the coatings recommendations for TiAlN-coated tooling. Inspect the tool for chipping or wear before each use and replace if cutting edge integrity is compromised.