DIN340 M35 Long HSS Cobalt Drill Bit – Fully Ground Twist Bit for Deep Hole

Product Specification

Product Introduction:
The DIN340 M35 Long Drill Bit is a high-performance, fully ground cobalt twist drill made from premium M35 high-speed steel (HSS-Co 5%). Designed to DIN340 long series standards, it offers exceptional red hardness, thermal stability, and wear resistance for drilling deep holes in tough metals. Ideal for professional use in heavy industries, this bit is produced by XINGRUI, a leading supplier of precision cutting tools with global reach.

Applications:
This long cobalt drill bit is engineered for industrial-grade deep drilling across a wide range of applications:

• Stainless Steel Processing: Easily penetrates tough stainless steel (e.g., 304, 316) without chipping or softening under heat.

• Automotive Industry: Perfect for engine block machining, frame fabrication, and custom metalwork.

• Aerospace Components: Designed to cut through titanium, Inconel, and aerospace-grade stainless steel with precision.

• Tool & Die Making: Used for deep, accurate hole-making in mold bases, dies, and jigs.

• Shipbuilding & Marine Engineering: Ideal for thick metal plates, stainless pipes, and structural sections in corrosive environments.

• Metal Fabrication & Welding: Suitable for workshop and assembly-line drilling tasks requiring depth and accuracy.

• Maintenance & Repair Operations (MRO): Commonly used in industrial maintenance to drill or repair deep holes in hard materials.

Compatible with drill presses, magnetic drills, radial drills, and CNC machining centers. Lubrication is recommended for optimal results.

Working Principle:
The 135° split point ensures precise self-centering without walking, reducing thrust and enhancing hole roundness. The M35 cobalt alloy resists heat deformation and maintains cutting performance in continuous operations. The long flute design allows smooth chip evacuation and clean, deep-hole performance without clogging.

Product Advantages:

• Material: M35 cobalt HSS (5% Co) for high red hardness and thermal strength

• Design: DIN340-compliant long series for deep hole applications

• Tip: 135° split point tip eliminates need for pilot holes

• Finish: Bright or TiN-coated for reduced friction and wear

• Precision: Fully ground for tight tolerances and smooth operation

• Use Case: Suitable for high-speed steel drilling, CNC, and manual setups

Company Strength – XINGRUI:
With over 15 years of manufacturing and export experience, XINGRUI provides world-class cutting tools to clients across Europe, the U.S., and Russia. All products are made under strict ISO and DIN quality systems, supported by in-house R&D and advanced CNC production lines. OEM, ODM, and private labeling are available.

Specifications (Top-Searched Sizes)

Packaging Information:

• Standard: Individual PVC/ABS tubes with size labeling

• Bulk Options: 5–10pcs in plastic or metal boxes

• Export Carton: Reinforced with foam inserts for transport protection

• OEM/Private Label: Available with custom logos, blister cards, barcodes, and shrink-wrapped sets

• MOQ for Custom Packaging: 2,000 pcs

FAQ – Frequently Asked Questions

Q1: Is it suitable for stainless steel?
Yes, M35 cobalt is specifically formulated for stainless steel, titanium, and hard alloys.

Q2: Can I use this in a handheld drill?
While possible, it’s recommended to use this long bit with stable machines to avoid deflection.

Q3: Do you offer private labeling or customized packaging?
Yes, XINGRUI offers full OEM/ODM services with custom branding and design.

Q4: What's the difference between DIN338 and DIN340?
DIN338 is standard length; DIN340 is a long series for deep hole drilling.

Q5: Do you supply metric/inch sets?
Yes. Custom sets in metric or imperial sizes are available in professional-grade metal or plastic cases.