Hertel GG040116 Square End Mill 1-1/4 in 4 Flute Hss

Product Description

The HERTEL GG040116 is a square-end, single-end mill designed for general-purpose milling operations in metal fabrication and machining. Built from M7 high speed steel, this 4-flute tool features a 1.25 inch cutting diameter, a 4 inch length of cut, and a 6.5 inch overall length. The 30-degree spiral helix promotes efficient chip evacuation and reduces cutting forces. The uncoated finish makes the tool well-suited for applications where re-sharpening is common practice. Centercutting geometry allows for direct plunging into workpiece material. Right-hand cut and right-hand flute configuration follow standard milling convention. This tool is installed and operated by machinists and CNC programmers working on manual mills, knee mills, and machining centers.

The GG040116 is used in production and job-shop environments for slotting, profiling, and peripheral milling of ferrous and non-ferrous metals. The regular-length classification and 1.25 inch shank diameter make it compatible with standard milling chucks, collet holders, and end mill holders sized for 1.25 inch shanks. Applications include face passes, side milling, and slot cutting where a full 4 inch depth of engagement may be required. The M7 HSS material grade provides good toughness and wear resistance for interrupted cuts and general steel milling at conventional speeds.

Key Features

• 1.25 inch mill diameter with matching 1.25 inch shank diameter for rigid, concentric tool holding
• 4 inch length of cut supports deep slot and pocket milling in a single pass
• M7 high speed steel construction balances toughness and edge retention
• 30-degree helix angle promotes chip flow and reduces cutting force
• Centercutting design permits plunge entry without pre-drilling
• Right-hand cut, right-hand spiral flute — standard orientation for conventional and climb milling
• Uncoated finish simplifies resharpening by a qualified tool grinding service

Compatibility

Designed for use in standard milling machine spindles and CNC machining centers equipped with tool holders accepting a 1.25 inch straight shank.

Installation Notes

Installation and operation of end mills should be performed by qualified machinists following established shop safety procedures. Always power down and lock out the spindle before mounting or removing the tool. Ensure the shank is fully seated and the tool holder is torqued to the holder manufacturer's specification. Verify runout with a dial indicator before beginning the cut to avoid premature edge wear or tool breakage.