Hertel 69009413 1" x 2-1/2" LOC 4FL HSS Extended Square End Mill

The Hertel 69009413 is a new, single-end, 4-flute high-speed steel (HSS) square end mill with a 1" cutting diameter, 2-1/2" length of cut, 1" shank diameter, and an extended overall length of 10-1/4" — confirmed directly from the box label "1X1X2-1/2X10-1/4 4FL HSS EXT SQ SEM W/WELD." The extended OAL with welded shank construction ("W/WELD") is characteristic of Hertel's extended-reach series, allowing access to deep cavities and pockets that standard-length end mills cannot reach; the welded construction joins the HSS cutting end to a steel shank for the rigidity needed at this length. With a 31–35° helix angle and bright/uncoated finish, this end mill is suited for conventional milling of steel, cast iron, aluminum, and general-purpose materials in manual mills and CNC machining centers accepting a 1" straight shank. Hertel, a production-grade tooling brand since 1947, manufactures this tool to ANSI standard geometry for direct compatibility with R8, ER, and similar 1"-bore collet systems or end mill holders.

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