Osg 5740500 Square End Mill 1/4 in 4 Flute Vanadium Hss

Product Description

The OSG 5740500 is a square-end, single-end mill designed for general-purpose milling operations in ferrous and non-ferrous metals, alloy steels, and similar workpiece materials. Manufactured from 3% vanadium high speed steel, it delivers increased wear resistance compared to standard M2 HSS tooling. The 4-flute geometry with a 30-degree right-hand spiral helix provides a good balance of chip evacuation and surface finish. With a 1/4 inch cutting diameter and 5/8 inch length of cut, this end mill suits slotting, peripheral milling, and light pocketing passes. The shank measures 3/8 inch in diameter, fitting standard collets and tool holders on knee mills, CNC machining centers, and manual milling machines. This tool ships uncoated and is centercutting, allowing direct plunge entry into the workpiece.

The 5740500 is intended for use in machine shops, toolrooms, and production environments where an HSS end mill is preferred over carbide — particularly for interrupted cuts or setups prone to vibration. The 2-7/16 inch overall length suits standard-reach applications without the rigidity loss associated with extended-reach tools. Typical users include machinists, toolmakers, and maintenance technicians running conventional or CNC milling equipment.

Key Features

• 3% vanadium high speed steel construction for improved wear resistance over standard HSS
• 4-flute, right-hand cut and right-hand flute spiral geometry
• 30-degree helix angle balances chip flow and cutting stability
• Centercutting design allows direct plunge milling without pre-drilling
• Uncoated finish suitable for use with cutting fluids on a wide range of materials
• Regular-length series for rigid, vibration-resistant setups

Compatibility

Designed for use in standard 3/8 inch collet chucks, end mill holders, and Weldon-style tool holders on manual and CNC milling machines. Part of OSG Series 574.

Installation Notes

Installation and tool changes must be performed with the spindle fully stopped and the machine in a lockout state per applicable shop safety procedures. Secure the shank fully within the collet or holder to the recommended engagement depth before tightening. Verify runout after installation to avoid premature edge wear. Feed rates and speeds should be set per the material being machined and the machine tool manufacturer guidelines.