GEK 4R 8.0xD8x25(R1.0)X75

Description

GEK 4R 8.0xD8x25(R1.0)X75 – 65 hrc corner radius end mill blue nano coated is a premium-grade CNC cutting tool engineered for high-speed machining of hardened materials. This robust solid carbide bull nose cutter features an 8.0mm cutting diameter, an 8mm shank (D8), a 25mm flute length, and an extended Overall Length (OAL) of 75mm. The defining feature of this tool is its 1.0mm Corner Radius (R1.0), which significantly reinforces the cutting edge corner, preventing the chipping often seen in sharp square end mills. Rated for 65 HRC, it is the ultimate solution for machining hardened die steels (D2, H13, P20), heat-treated alloys, and difficult-to-cut stainless steels.

The advanced Blue Nano Coating (nACo) on this end mill provides exceptional heat resistance and surface hardness. CNC machinists frequently search for a blue nano coated end mill because this specialized coating reduces friction and allows for dry machining at high temperatures. By creating a thermal barrier, the coating directs heat into the chip rather than the tool, extending the lifespan of your CNC milling cutter for hardened steel. The 4-flute design (GEK 4R) balances large chip evacuation space with the core strength needed to reduce vibration and chatter during heavy profiling or pocketing operations.

With a 75mm overall length, this tool offers extra reach for deep-pocket milling without sacrificing rigidity. The R1.0 corner radius end mill design is particularly critical for the mold and die industry. A “bull nose” geometry creates a stronger tool tip that allows for higher feed rates compared to standard flat end mills. Customers looking for a high feed milling cutter for contouring complex 3D shapes will find this tool indispensable. It leaves a superior surface finish on the workpiece, often reducing the need for subsequent polishing or bench work.

Whether you are roughing out hardened steel or performing a high-precision finishing pass, this 8mm end mill with corner radius delivers consistent accuracy. It is compatible with all standard CNC machining centers and is ideal for industries such as aerospace, automotive,