Sgs 30139 Square End Mill 5/16 in 4 Flute Solid Carbide

Product Description

The SGS 30139 is a solid carbide square end mill designed for high-performance milling across a wide range of workpiece materials. With a 5/16 inch (0.3125 inch) mill diameter, 13/16 inch (0.8125 inch) length of cut, and a 4-flute right-hand spiral configuration, this tool delivers efficient chip evacuation and surface finish in demanding cutting applications. The 30-degree helix angle balances cutting force and material removal rate. Manufactured from micrograin solid carbide, it holds tight tolerances and resists wear in production environments. A licensed machinist or tooling specialist installs this end mill in CNC mills, VMCs, or manual knee mills.

The SGS 30139 is suited for milling operations in materials classified under ISO material groups H, K, M, N, P, and S, covering hardened steels, cast irons, stainless steels, non-ferrous metals, carbon steels, and superalloys. Its 2.5 inch overall length and 5/16 inch straight-cylindrical shank fit standard collet chucks and end mill holders. The single-end, bright/uncoated finish makes it a practical general-purpose tool for shops requiring consistent performance without a specialty coating. Series 1 designation places it in SGS standard length tooling.

Key Features

• Micrograin solid carbide construction for wear resistance and dimensional stability
• 4-flute right-hand spiral design promotes efficient chip evacuation
• 30-degree helix angle balances cutting forces across a wide material range
• Variable index flute spacing reduces harmonic vibration during cuts
• Center-cutting geometry allows plunge entry without a pre-drilled hole
• Bright/uncoated finish suitable for use across ISO material groups H, K, M, N, P, and S

Compatibility

Compatible with ISO material groups H, K, M, N, P, and S as specified by the manufacturer. Designed for use in standard 5/16 inch collet chucks and end mill holders with straight-cylindrical shank bores.

Installation Notes

Installation is performed by a qualified machinist or CNC tooling technician. Power down and lock out the spindle before installing or removing tooling. Seat the shank fully in the collet or holder and torque the retention nut per the toolholder manufacturer specifications. Inspect runout with a dial indicator after installation to confirm acceptable concentricity before cutting.