Narex 65405601

Narex 65405601 Cobalt HSS-Co Metal Drill Set, 5 pcs (3-8 mm)

The Narex 65405601 high-performance drill set is engineered for demanding operations in common and alloyed steels. Made from high-speed steel with 5% cobalt content (HSS-Co), these bits conduct heat efficiently, making them resistant to high loads and temperatures. This 5-piece set includes diameters 3, 4, 5, 6, and 8 mm – ideal for stainless steel, cast iron, and other tough metals.

Features

• 5% cobalt (HSS-Co): Superior heat resistance and red hardness.
• Set contents: Ø3, 4, 5, 6, 8 mm.
• Cylindrical shank: Fits all standard drill chucks.
• Cross-ground point: Self-centering, reduces thrust.
• Ground flutes: Smooth chip evacuation.

Benefits

• Drills stainless steel without rapid dulling.
• Maintains cutting edge at higher temperatures.
• Reduces need for constant pecking and cooling.
• Longer tool life in automated and manual drilling.

Set Contents

• Ø3 mm – pilot holes for M4 taps
• Ø4 mm – clearance for M4 screws
• Ø5 mm – standard rivet hole
• Ø6 mm – M6 clearance or dowel hole
• Ø8 mm – larger fasteners and plumbing

Material & Compatibility

• Material: HSS with 5% cobalt (ISO K/M/N).
• Compatible materials: Stainless steel (304, 316), alloy steel, cast iron, titanium, Inconel (low speed).
• Not for: Aluminum or soft plastics (overkill).
• Speed recommendation: 15-25 m/min for stainless steel with coolant.

Care Instructions

• Use heavy cutting oil or soluble oil for stainless.
• Reduce speed by 40-50% compared to standard HSS.
• Do not let bit dwell in hole – maintain feed.
• Sharpen only with green silicon carbide wheels.

Narex Cobalt HSS-Co – Applications

• Stainless steel fabrication: Handrails, tanks, kitchen equipment.
• Maintenance repair: Drilling broken bolts and hardened steel.
• Die and mold making: Tool steel pilot holes.
• Shipbuilding: High-strength low-alloy steels.

Keywords

Narex 65405601, cobalt drill set, HSS-Co 5% bits, stainless steel drill bits, metal drill set 3-8mm, Narex cobalt set, high-performance metal drills.