Hertel E299914055 Square End Mill 1-1/4 in 2 Flute Cobalt

Product Description

The HERTEL E299914055 is a cobalt square end mill designed for milling operations in ferrous and hard materials. Built from M42 cobalt high-speed steel, it delivers heat resistance and edge retention under aggressive cutting conditions. The tool features a 1.25-inch cutting diameter, a 2.25-inch length of cut, and a 30-degree spiral helix angle that promotes chip evacuation and smooth cutting action. With two flutes and a centercutting geometry, this end mill handles both peripheral and plunge milling. It ships uncoated and is suited for machinists and toolroom operators working on manual mills, CNC machining centers, or knee mills.

This end mill fits standard applications in job shops, production machining, and maintenance environments where cobalt tooling is preferred over carbide for its toughness and regrindability. The 1.25-inch shank diameter seats directly in standard ER or side-lock holders sized for 1-1/4-inch tooling. With a 4.75-inch overall length, it provides adequate reach for most standard setups without excessive overhang. Right-hand cut and right-hand flute configuration make it compatible with conventional CNC and manual milling spindle rotation.

Key Features

• M42 cobalt construction for improved heat resistance and edge retention compared to standard M2 HSS
• 30-degree helix angle promotes efficient chip evacuation during full-slot and side-milling cuts
• Centercutting design allows direct plunge entry without a pre-drilled hole
• Two-flute geometry provides large chip clearance, suited for softer steels and sticky materials
• Uncoated finish — ready to run as-is or accept custom coating if required
• Right-hand cut, right-hand flute for standard milling spindle direction

Compatibility

Designed as a direct-fit replacement or standard tooling selection for 1-1/4-inch diameter square end mill applications using ER40, CAT, BT, or side-lock holders with 1-1/4-inch bore capacity.

Installation Notes

Installation should be performed by a qualified machinist or toolroom technician. Secure the shank fully within the holder to the recommended minimum engagement depth per the holder manufacturer before tightening. Verify spindle runout with a dial indicator before making the first cut. Follow applicable shop safety procedures and machine guarding requirements when changing or setting cutting tools.