In drilling operations significantly affected by cutting heat and vibration, the cutting edge geometry design and coating of drill bits prove particularly critical. This is especially true for stainless steel drilling, where the inherent material properties pose greater challenges than other workpiece materials—such as high cutting forces, susceptibility to work hardening, elevated cutting temperatures, and poor chip breaking ability. These factors lead to accelerated tool wear and difficulties in controlling machining costs. Our independently developed carbide drill bit products continuously optimize cutting edge geometry and coating enhancements. By extending tool life and reducing machining costs, they simultaneously decrease tool change frequency and effectively shorten lead times.
This article presents a case study where a customer utilized the Dynamic Duo Drill Bits [T-Series Flat Drill + EZ-Series Drill] to break through stainless steel drilling barriers, achieving improved machining efficiency and extended tool service life.

TLD Series Flat Drill Features:
This product line offers 2D/3D/4D/5D variants with comprehensive specifications to accommodate varying hole depth requirements. It features a generously designed flute geometry that delivers exceptional chip evacuation performance. Additionally, the unique margin design with thicker core structure enhances rigidity, enabling stable deep-hole drilling. The application of premium DV coating—outstanding in both edge chipping resistance and wear resistance—combined with smoothing treatment ensures prolonged tool life and stable machining performance.

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Features of EZ-Type Drills:‌
‌The EZN series employs a proprietary chisel edge geometry and margin profile.‌
Its novel chisel edge configuration significantly reduces axial cutting resistance while enhancing chip evacuation efficiency and cutting edge strength. This is achieved through an ‌advanced self-centering point design‌ (see comparative illustration below). Compared to conventional drills, this patented geometry successfully mitigates ‌sudden spikes in axial load‌ during workpiece penetration.

The margin profile employs a novel design that reduces frictional resistance between the drill periphery and hole wall, while extending tool life.‌ Specifically, by implementing ‌reduced margin width combined with reinforced geometry‌, it successfully minimizes contact area with the workpiece and improves machined surface finish (Ra). The 2D/3D/4D series feature a ‌single-margin design‌, whereas the 5D type utilizes a ‌dual-margin configuration‌ to effectively suppress drilling instability during deep-hole operations, ensuring stable machining with superior surface integrity.

‌Φ11 Flat Counterboring Machining

Φ4.3 EZ-Drill Through Hole Machining

‌Drill Duo:‌

Flat Bottom Drill Series‌ — Inhibits Burrs, Extends Tool Life!

‌EZ Drill Series‌ — Extends Tool Life!

Reduces Drill Change Frequency, Effectively Shortens Machining Time!

We hope that through this introduction, our drill products can become another strong and powerful assistant for you in improving drilling efficiency, extending tool life, and meeting the requirements of stable processing! In the future, we will continue to expand product specifications and research and develop new product series to solve various new drilling requirements.