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Stock, a German precision tool manufacturer founded in the early 20th century, has long enjoyed a distinguished reputation in the field of CNC cutting tools. The Stock brand has established a solid position in both European and international markets through its consistent quality and reliability.
Within Stock’s extensive product portfolio, its end mills, twist drills, and reamers are the most popular and widely applied series, embodying the perfect fusion of traditional German industrial craftsmanship and modern advanced manufacturing technology. This article will delve into the engineering design, performance parameters, and practical application value of Stock’s best-selling tools in modern CNC machining.
High-Performance End Mills
End mills form the core of Stock’s precision tooling program. Its carbide and high-speed steel (HSS-E) end mills are renowned for reliable performance in automotive, mold, and precision engineering industries. Stock’s best-selling end mills achieve an optimal balance between chip evacuation efficiency, tool rigidity, and surface finish, while delivering exceptional tool life.
The HSC (High Speed Cutting) carbide series excels particularly in machining high-hardness materials (up to 70 HRC). Featuring a fine-grain tungsten carbide substrate combined with TiAlN or AlCrN coatings, this series achieves cutting speeds up to 220 m/min while maintaining low rake face wear and high dimensional accuracy. Its tool geometry incorporates variable helix angles and a thickened core, effectively reducing vibration for stable, high-speed, and high-precision machining.
Series | Material Range | Recommended Vc (m/min) | Feed per Tooth (mm) | Tool Life Gain |
HSC Carbide | Hardened Steel 55–70 HRC | 160–220 | 0.02–0.06 | +30% |
Universal Carbide | Steel, Stainless, Cast Iron | 100–180 | 0.04–0.10 | +25% |
AluPro | Aluminum, Non-ferrous | 300–450 | 0.06–0.14 | +40% |
RoughPro | Tool Steel, Forged Steel | 90–150 | 0.08–0.18 | +20% |
STOCK SPL 2025 DE
In our precise comparative testing, Stock’s HSC carbide end mills achieved a metal removal rate (MRR) 25% higher than European competitors on identical materials. This result stems from Stock tools’ superior coating adhesion and edge integrity. Additionally, Stock tools’ dynamic balance design supports higher spindle speeds while significantly reducing vibration, making them ideal for 5-axis and high-speed machining centers.
Meanwhile, the Universal series from Stock is widely favored in small to medium-sized machining shops for its exceptional material adaptability. For aluminum and non-ferrous metals, the AluPro series features mirror-polished chip flutes and an optimized front angle design. This effectively prevents built-up edge formation during dry cutting, significantly improving workpiece surface quality and extending tool life.
High-Precision Twist Drills
Twist drills represent Stock’s longest-standing and most technically mature product category. With extensive expertise in manufacturing HSS, HSS-E, and carbide drills, Stock delivers high-performance solutions tailored to diverse drilling requirements. From standard through-hole applications to deep-hole machining, Stock drills integrate advanced metallurgical techniques with stringent dimensional control standards.
Stock’s best-selling models include the DIN 338 N series and DIN 340 extended length series, both featuring high-precision ground geometries and excellent concentricity. The self-centering split-point design effectively reduces axial thrust, often eliminating the need for pilot holes. Even in high-speed production environments, Stock carbide drills maintain runout tolerances of 5–8 microns, ensuring consistent hole diameter quality.
Model | Type | Diameter Range (mm) | Cooling Option | Runout Tolerance (µm) |
DIN 338 N | HSS-E | 1–13 | External | ≤10 |
DIN 340 Long | HSS-Co | 0.5–12 | External | ≤8 |
Carbide Drill Plus | Solid Carbide | 3–16 | Through Coolant | ≤5 |
Deep Hole Pro | Carbide | 2–8 | Internal | ≤5 |
The continuous optimization of flute design in the Stock brand drill series is key to its long-term leadership. Through advanced CNC grinding processes, Stock brand drill flutes deliver exceptional chip evacuation performance, making them particularly suitable for deep hole drilling.
Simultaneously, Stock brand drills utilize micro-grain tungsten carbide substrates with high thermal stability and hardness, ensuring consistent performance during extended machining cycles.
In field tests conducted with automotive component suppliers, Stock carbide drills demonstrated a 22% reduction in wear rate, while hole roundness remained within 0.01 mm during extended batch production runs.
This performance significantly reduces tool change frequency, enhancing production continuity and economic efficiency.
High-Precision Reamers
Stock brand reamers embody the fusion of traditional craftsmanship and modern CNC innovation. These tools are primarily used in fields demanding extreme hole precision, such as aerospace, hydraulic systems, and injection molds. Stock manufactures both solid and adjustable reamers to accommodate diverse materials and machining environments.
Stock’s popular carbide spiral flute reamers are renowned for low cutting forces and high stability. They achieve surface roughness as fine as Ra 0.4 µm while maintaining IT6 dimensional tolerances, and can consistently process hundreds of holes with unwavering precision. The adjustable reamer system allows users to achieve precise control through fine-tuning, significantly reducing scrap rates and rework costs.
Reamer Type | Material | Diameter Range (mm) | Surface Finish (Ra µm) | Dimensional Tolerance |
HSS-E Straight Flute | HSS-E | 3–50 | 0.8–1.2 | ±0.005 mm |
Carbide Spiral Flute | Carbide | 2–40 | 0.4–0.8 | ±0.003 mm |
Adjustable System | Carbide + Holder | 6–60 | ≤0.4 | ±0.002 mm |
In our internal quality audits, the process capability index (Cp/Cpk) for adjustable system reamers exceeds 1.67, demonstrating exceptional dimensional stability. This high precision is achieved through rigorous manufacturing processes including multi-axis CNC grinding, in-line measurement, and tool body dynamic balancing.
Additionally, the Stock brand utilizes high-cobalt HSS-E material, enhancing thermal hardness and wear resistance, enabling the tools to perform effectively in dry or minimum quantity lubrication (MQL) machining environments.
Quality Control and Process Management
The success of Stock brand cutting tools stems from a rigorous quality assurance system. Each tool undergoes multi-stage inspections, including laser measurement and 3D optical scanning, to verify geometry, concentricity, and coating thickness. Strict adherence to ISO 9001 and ISO 13399 standards ensures that digital tool data can be directly integrated with CAD/CAM systems for automated toolpath programming.
Furthermore, Stock collaborates closely with leading European coating suppliers to develop customized PVD coatings tailored for specific materials. Its nano-layered TiAlN and AlCrN coatings significantly enhance oxidation resistance and edge retention, enabling stable tool operation at higher speeds while maintaining exceptional surface finish quality.
Market Positioning and Industry Significance
In the global tooling market dominated by giants like Guhring, Mapal, and Mitsubishi Materials, the Stock brand has carved out its niche by focusing on “reliability and consistency.” Rather than pursuing mass production, it concentrates on application-oriented custom solutions and short lead times. This strategy resonates strongly with small and medium-sized machining enterprises, who prioritize personalized support and European manufacturing quality.
As manufacturing evolves toward automation and high-mix low-volume production, Stock’s modular reamers and multi-purpose carbide end mills precisely meet the flexible demands of modern CNC workshops. Furthermore, Stock offers tool regrinding and recoating services, effectively extending tool life to deliver dual benefits of cost efficiency and environmental sustainability.
Conclusion
Stock brand end mills, twist drills, and reamers have enjoyed enduring popularity due to their deep understanding of modern machining challenges. By combining precision manufacturing, advanced coatings, and optimized geometries, Stock consistently delivers highly efficient and reliable cutting solutions. In an era where efficiency and repeatability determine competitiveness, Stock’s commitment to precision engineering ensures its tools remain an essential component in workshops worldwide.