M35 Cobalt Coated HSS Twist Drill Bit Set (1.0mm–13mm)
Specifications
| Feature | Details |
| Material | M35 High-Speed Steel (HSS) with 5% Cobalt alloy |
| Coating | Cobalt/Amber finish for heat and wear resistance |
| Size Range | 1.0mm to 13mm (Incremental set) |
| Point Angle | 135° Split Point (Self-centering) |
| Compatibility | Hand drills, drill presses, and CNC machines |
| Primary Utility | Hardened steel, stainless steel, cast iron, wood, and plastic |
Description
This M35 Cobalt Twist Drill Bit Set is an essential upgrade for any workshop, designed for those who require professional-grade performance in challenging materials. Unlike standard HSS bits, the addition of 5% Cobalt significantly increases the hardness and heat resistance of the metal. This allows the bits to retain their edge even when drilling through abrasive or tough metals like stainless steel, cast iron, and tempered alloys.
Key Performance Features
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M35 Cobalt Alloy: The high cobalt content prevents the bits from softening under the intense friction and heat generated when drilling through hard metals, extending the tool life by 3x–5x compared to standard bits.
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135° Split Point Tip: The "split point" design prevents the bit from "walking" or skidding across the surface of the material, eliminating the need for a center punch and ensuring precise hole placement.
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Aggressive Chip Removal: The flute design is optimized for rapid chip ejection, which keeps the cutting area cool and prevents clogging, especially when drilling deep holes in metal.
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Versatile Range: Covering 1.0mm to 13mm, this set ensures you have the exact diameter required for everything from precision pilot holes to large-diameter clearance holes.
Best Practices for Drilling Metal
1.Speed Matters:Critical.
Use low RPM and high torque when drilling hard metals like stainless steel. High speeds will generate excess heat and quickly dull the cobalt edges.
2.Use Lubricant:Essential.
Always use cutting oil or a cooling fluid. This lubricates the cutting edge and carries heat away, preventing the bit from overheating and failing.
3.Apply Pressure:Technique.
Apply firm, consistent pressure. Do not "bounce" the drill; steady, heavy pressure helps the bit bite into the material and cut effectively.
Maintenance Tips
⚠️ Pro-Tip: If the drill bit starts to squeal or produce smoke rather than metal shavings, stop immediately. Your RPM is too high, or the bit has become dull and requires re-sharpening.
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Re-sharpening: These bits can be sharpened using a bench grinder or a dedicated drill bit sharpener. Maintain the original 135° angle for optimal performance.
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Storage: Keep the bits in their designated case slots to prevent the edges from bumping into each other, which can cause micro-chipping on the hardened cutting surfaces.
