V7plus GMF66 is original YG-1 Korea high-performance solid carbide 4-flute square end mill belonging to premium V7PLUS series, specially optimized for high-efficiency rough & finish milling of stainless steel, carbon steel, alloy steel and cast iron on CNC machining centers. Equipped with exclusive multiple unequal helix angle & uneven flute pitch structure plus proprietary Y-type heat-resistant coating, this cutter effectively suppresses cutting chatter, improves chip evacuation and drastically lowers built-up edge during continuous heavy-feed machining, balancing high material removal rate and long service life for batch precision mold & mechanical component processing.

Optimized deep chip groove design accelerates hot swarf discharge, reducing cutting thermal abrasion and maintaining stable dimensional accuracy in long-cycle slotting, shoulder milling and contour profiling.

• V7PLUS exclusive Y multi-layer heat-resistant coating delivers superior high-temperature oxidation resistance & anti-adhesion, perfect for sticky stainless steel cutting.
• 4-flute unequal spacing + variable multiple helix geometry eliminates resonance chatter, upgrades workpiece surface finish and improves feed speed limit.
• Ultra-fine grain solid tungsten carbide substrate enhances edge toughness and wear resistance, applicable for material up to HRC40 hardness.
• Deep polished flute groove optimizes chip curling & smooth chip removal to avoid chip clogging inside cutter grooves during deep slot machining.
• Precision ground sharp cutting edge supports mixed roughing & finishing one-tool operation to reduce tool change cost.

• 304/316 Stainless Steel
• Carbon structural steel / Alloy steel
• Grey & ductile cast iron
• Pre-hardened steel ≤HRC40
• Nickel-based low-temperature superalloy

• Square shoulder side milling
• Full depth slot rough & finish machining
• Contour profiling & cavity milling
• Automotive & mold batch CNC processing
• General mechanical part high-feed milling

Combining V7PLUS advanced coating, anti-vibration unequal flute design and premium fine grain carbide blank, GMF66 realizes universal high-efficiency machining across stainless steel, steel and cast iron. It cuts chatter failure rate obviously, improves machining feed speed by 30% vs common standard end mills and extends average tool life, becoming mainstream universal solid carbide end mill for metalworking workshop mass production.