Center Drill Bit Set, M35 HSS Cobalt Centering Drill Bit for Stainless Steel, Carbon Steel, Alloy Steel, Cast Iron, Copper, Other Hard Metals, Metric 1-5mm (7pcs) TiAlN Coated
Industrial-Grade Cobalt Construction: This center drill bit set features M35 cobalt alloy (8% Co) with nano TiAlN coating, achieving approx. 89 HRC hardness. The reinforced arc-shaped cutting edge withstands high temperatures while drilling hardened and stainless steel up.
Precision-Ground Cutting System: Mirror-polished centering drill bits utilize 120° split-point geometry and dual-helix flutes. Features: ≤0.03mm radial runout; Sandblasted anti-friction surface; 40% faster chip evacuation vs standard bits; Ideal for lathe machining and CNC operations.
Multi-Material Mastery: These center drills conquer: Stainless steel (304/316); Hardened tool steels and carbon steel; Non-ferrous alloys, brass, aluminium, copper etc.; Hard metals; Wood and other composite materials.
Professional-Spec Size Matrix: The 7-piece center drill bit set includes essential 1.0-5.0mm sizes for: 3/16" (5mm) to 5" (130mm) workpiece diameters; Mold base preparation; Rotary table alignment; Countersink pre-drilling.
Durable Storage & Warranty: The storage case protects your center drill collection from job site hazards. Backed by 90-day performance guarantee - contact us for replacements and other customer care services!