Hertel E299914035 Ball End Mill 1/4 in 4 Flute Cobalt

Product Description

The HERTEL E299914035 is a single-end ball end mill designed for contour milling, profiling, and slotting operations in metalworking applications. Manufactured from M42 cobalt high-speed steel, this tool provides added heat and wear resistance compared to standard HSS grades, making it suitable for machining harder alloys and abrasive materials. The 1/4 inch cutting diameter and 1-3/4 inch length of cut allow access to moderate-depth pockets and curved surface profiles. With 4 flutes and a 30-degree right-hand spiral helix, it balances chip evacuation with surface finish quality. The bright, uncoated finish is compatible with a wide range of cutting fluids. Machinists and toolroom operators on manual mills and CNC machining centers are the primary users of this tool.

This ball end mill is suited for job shop, production, and maintenance machining environments. It performs well in ferrous and non-ferrous metals including alloy steels, tool steels, cast iron, and stainless steel. The 3/8 inch shank diameter fits standard collet chucks, end mill holders, and shrink-fit toolholders common on vertical machining centers and knee mills. The 3-9/16 inch overall length provides adequate reach for typical cavity and profile work without excessive overhang that would compromise rigidity.

Key Features

• M42 cobalt HSS construction for improved hardness and heat resistance over standard M2 HSS
• 4-flute design balances chip removal and finished surface quality
• 30-degree right-hand helix reduces cutting forces and promotes smooth chip flow
• Bright, uncoated finish compatible with oil, synthetic, and flood coolant systems
• Single-end configuration with 1/4 inch ball nose for contour and profile milling
• 3/8 inch shank fits widely available collet and end mill holder tooling

Compatibility

Designed as a direct-fit replacement or standard tooling selection for any spindle setup accepting a 3/8 inch shank end mill, including ER collet chucks, Weldon-style end mill holders, and shrink-fit holders on manual or CNC vertical milling machines.

Installation Notes

Installation should be performed by a qualified machinist or toolroom technician. Ensure the machine spindle is fully stopped and locked out before inserting or removing the tool from the holder. Verify that the shank is fully seated to the recommended engagement depth in the holder and that set screws or collet nuts are torqued per the toolholder manufacturer specifications. Inspect the cutting edges for chips or damage before each use, and match spindle speed and feed rate to the workpiece material per established speeds-and-feeds references for cobalt end mills.