Hertel E899921316 Square End Mill 0.125 in 4 Flute Hss Tin

Product Description

The HERTEL E899921316 is a double-end square end mill manufactured from high speed steel (HSS) with a titanium nitride (TiN) finish. It features a 0.125-inch cutting diameter, a 0.1875-inch length of cut, and a 3/8-inch shank diameter with a 2.75-inch overall length. The four-flute, spiral-flute geometry runs a 30-degree helix angle with right-hand cut and right-hand flute orientation. This tool is used in milling operations on manual mills, CNC machining centers, and knee mills by machinists and tool-and-die professionals working in precision metal removal applications.

This end mill is suited for light to moderate slotting, profiling, and peripheral milling in ferrous and non-ferrous materials where a small-diameter, double-end tool is practical. The double-end design provides two usable cutting ends, extending tool life between changes. The TiN coating adds surface hardness and reduces friction at the cutting edge. It is a common selection for job shop environments, maintenance machining, and prototype work where HSS tooling is preferred over carbide for interrupted cuts or flexible setups.

Key Features

• Double-end design provides two cutting ends per tool
• TiN finish increases surface hardness and reduces tool wear
• 30-degree helix angle promotes smooth chip evacuation during milling
• Four spiral flutes for balanced cutting action and improved finish
• Right-hand cut and right-hand flute orientation for standard spindle use
• High speed steel construction suitable for interrupted cuts and flexible setups

Compatibility

Designed as an OEM-style replacement and standard-fit tooling for milling machines accepting a 3/8-inch straight shank, including manual knee mills and CNC machining centers with standard collet or end mill holder systems.

Installation Notes

Installation should be performed by a qualified machinist with the spindle fully powered down and locked out before tool changes. Secure the shank in a clean, properly sized collet or end mill holder to the full recommended engagement depth. Inspect the cutting edges and TiN coating for chips or wear before each use. Follow shop safety practices and applicable machine guarding requirements during all milling operations.