Hertel 44838852 Roughing End Mill 5/16 in 3 Flute Cobalt

Product Description

The HERTEL 44838852 is a single-end cobalt roughing end mill designed for aggressive material removal in milling operations. Built from M42 cobalt high-speed steel with a bright, uncoated finish, this tool delivers the heat and wear resistance needed for harder workpiece materials. It features a 5/16-inch mill diameter (0.3130 inches decimal), a 7/16-inch length of cut (0.4375 inches), and a 3/8-inch shank diameter. The three-flute, fine-pitch configuration produces a serrated cutting edge profile that breaks chips efficiently, reduces cutting forces, and minimizes chatter during hogging passes. Overall length is 2-3/16 inches (2.1880 inches decimal). Installed by machinists and toolroom professionals in CNC machining centers and manual knee mills.

This end mill is suited for roughing operations in ferrous and non-ferrous materials where stock removal rate is the priority over surface finish. The fine-pitch serrated flute geometry is commonly applied in roughing passes on steel, stainless, and cast iron. The right-hand cutting and right-hand flute direction make it compatible with standard spindle configurations. With no extended reach and a compact overall length, it is best suited for shallow-to-moderate depth applications where rigidity is important. Professional machinists and toolroom technicians specify this tool for production roughing where cobalt-grade tooling outperforms standard HSS.

Key Features

• M42 cobalt high-speed steel construction for improved heat and wear resistance over standard HSS
• Three-flute fine-pitch geometry for efficient chip breaking and reduced cutting forces during roughing
• Bright, uncoated finish suitable for a wide range of workpiece materials
• Right-hand cut and right-hand flute direction for standard spindle compatibility
• 3/8-inch shank diameter with tight tolerance (-0.0001 to -0.0005 inches) for secure tool holding
• Single-end design, non-centercutting — requires pre-drilled entry or side-entry engagement

Compatibility

Designed as a direct-fit replacement or standard tooling selection for CNC machining centers, manual knee mills, and similar milling equipment accepting a 3/8-inch shank end mill. No specific model compatibility data was provided in the product input.

Installation Notes

Installation should be performed by a qualified machinist or toolroom technician. Ensure the spindle is fully stopped and the machine is locked out before inserting or removing the tool from the tool holder. Seat the shank fully into the collet or end mill holder and torque the retention hardware per the tool holder manufacturer specification. This is a non-centercutting end mill and must not be plunged axially into solid material — use a pre-drilled pilot hole or ramp and helical entry strategies.