ZEICIN is a specialized export brand focusing on high-speed steel (HSS) raw materials and precision tools. With independently developed material technology and a one-stop production system - from raw material development, smelting, RS-ESR remelting, forging, heat treatment to precision machining - ZEICIN delivers stable, high-quality, and cost-effective products. We are committed to providing reliable, durable HSS materials and specialized drills for demanding applications such as stainless steel, quenched & tempered steel, and alloy components, meeting high-quality, high-performance, and high cost-performance standards.
Product Description
1. Precision-Crafted for Diamond-Level Accuracy
These high-speed steel (HSS) center drills are engineered for ultra-precise drilling, making them ideal for diamond and gemstone settings, as well as fine work on metals like gold, platinum, titanium, and stainless steel. The sharp, centered tip ensures burr-free entry points, critical for achieving clean, symmetrical stone seating and aesthetic finishes.
2. Multi-Diameter Functionality with Burr-Free Transitions
Each drill features a step-cut geometry that enables multi-size drilling in a single pass-perfect for creating pilot holes for diamond mounts or prongs. The integrated deburring design delivers clean hole edges, reducing the need for secondary polishing and preserving the surface integrity of luxury-grade materials.
3. Vacuum Heat Treated for Maximum Wear Resistance
Crafted from premium HSS and treated with vacuum heat processes, these center drills are built to withstand high-temperature friction while maintaining tip sharpness and structural stability. This durability is especially beneficial for repetitive use in jewelry and watchmaking, where both tool life and performance consistency are vital.
4. Versatile Across Fine Jewelry Applications
Ideal for both traditional bench jewelers and automated precision CNC setups, these drills are widely used in fine jewelry manufacturing, stone setting, micro-drilling, and luxury watch component preparation. Their reliability and control make them essential for any operation requiring exceptional precision and surface finish.
Six Key Features
- Premium Material Selection - High-quality steel for extended lifespan.
- Short Lead Time - Efficient production ensures quick delivery.
- Fast Drilling Speed - Sharp cutting edge for rapid penetration.
- Reliable Quality - Strict quality control for consistent performance.
- Multiple Specifications - Various sizes to meet different needs.
- High Fracture Resistance - Reinforced design prevents breakage.
Detailed Advantages
1. Micron-Grade Razor-Sharp Cutting Edge
Crafted from premium high-speed steel (HSS), these center drills feature ultra-sharp, precision-ground cutting edges-engineered to deliver clean, effortless penetration into fine metals. Their low-resistance cutting action helps minimize burr formation and distortion, ensuring flawless holes for high-precision tasks such as diamond or gemstone seat preparation.
2. Self-Centering Split Point for Pinpoint Accuracy
The specially designed anti-slip split point tip enables accurate, walk-free starts without the need for pre-punching. This is critical when working with delicate, high-value metals like platinum, gold, or titanium, where even the slightest misalignment can compromise diamond setting integrity.
3. Spiral Flute Chip Evacuation for Thermal Stability
The spiral flute design is optimized for step-by-step chip clearance, effectively preventing clogging and reducing heat buildup. This supports stable performance in micro-drilling operations-key in jewelry and luxury component manufacturing-while also protecting tool longevity and part surface quality.
4. Corrosion-Resistant, Mirror-Finished Surface
Each drill is finished with a mirror-like polish or protective PVD coating (e.g., titanium-based) that resists rust, wear, and chemical exposure. This ensures lasting sharpness and appearance, especially in environments exposed to coolants, polishing compounds, or hand-applied lubricants during jewelry fabrication.
5. Multi-Stage Balanced Geometry for Fine-Tolerance Work
Designed with a multi-step geometry, these center drills allow for multiple pilot hole sizes in one pass-without compromising alignment or control. This is particularly beneficial for diamond mount settings, reducing tool changes while maintaining concentricity and hole accuracy in fine metal structures.
Why Choose Our Product?
1. Exceptional Wear Resistance for Fine Metals
Engineered from high-grade high-speed steel (HSS), our center drills are designed to withstand continuous friction and high temperatures-essential when working with platinum, gold, stainless steel, or titanium in luxury-grade applications. Their superior hardness ensures long-lasting edge retention, making them ideal for delicate yet demanding tasks like diamond seat creation.
2. Multi-Diameter Precision with Flawless Finishes
The stepped cutting geometry allows for multi-size drilling without tool changes, maintaining high concentricity and stability. Each pass produces clean, burr-free holes, perfect for diamond or gemstone settings where accuracy and surface finish are critical. The design also minimizes the need for post-processing, boosting workflow efficiency.
3. Precision Versatility Across Luxury Applications
Whether you're a bench jeweler, CNC technician, or luxury watchmaker, these HSS center drills offer the precision and control required for fine-tolerance work. Ideal for center marking, pilot holes, and gemstone setting preparation, they are a reliable choice for any environment that demands refined detail and structural perfection.
Our Advantages
Advanced Manufacturing for Diamond-Level Precision
1. CNC Precision Grinding for Micron Accuracy
Our HSS center drills are crafted using advanced CNC grinding technology, achieving ultra-uniform step geometries, razor-sharp cutting edges, and precise tip centering. This ensures micron-level alignment, critical for applications such as diamond setting holes, jewelry prongs, or watchmaking pilot bores, with minimal vibration and maximum consistency.
2. Vacuum Heat Treatment for Superior Strength
Each bit is treated in a vacuum heat chamber to boost both surface hardness and core toughness. The result is a drill capable of withstanding the extreme pressure and heat of drilling materials like platinum, titanium, and white gold, making it ideal for luxury manufacturing and precision work.
3. Mirror-Like Ultra-Fine Polishing
An ultra-smooth finish reduces surface friction and heat buildup, particularly during high-speed or repetitive operations. This not only extends tool life but also prevents burring or scratching, essential when working with soft metals, fine jewelry, or thin-walled parts where flawless surface integrity is non-negotiable.
Metallurgical Excellence for Durability
1. Ultra-Clean HSS with ESR Refinement
Using Electric Arc Furnace (EAF), Ladle Refining (LF), Vacuum Degassing (VD), and Rapid Solidification Electro-Slag Remelting (RS ESR), our high-speed steel undergoes deep purification. This ensures low inclusion levels, excellent microstructure uniformity, and enhanced thermal/mechanical reliability, ideal for jewelry-grade precision.
2. HRC 67 via Thermal Optimization
We combine quenching, cryogenic treatment, and precision tempering to achieve up to HRC 67 hardness, while maintaining crack resistance. This thermal profile supports long-term drilling performance, even on abrasive or composite metals.
3. RS ESR Edge Toughness
Our edge refinement through RS ESR technology promotes uniform carbide distribution and cobalt reinforcement, resulting in exceptional edge retention and stable performance even under thermal cycling and high torque conditions often found in fine fabrication and high-value part assembly.
Precision Customization for Industry-Specific Demands
1. Material Optimization: M35-Centric Alloy
While we offer M2 and M42 options, M35 remains our go-to for diamond-related applications due to its optimal wear-toughness balance, making it perfect for hard metal micro-drilling.
2. Tailored Geometry & Coating Options
We support custom flute lengths, step heights, and cutting angles to suit specialized gemstone seating, watch plate fabrication, or fine mold pilot boring. Available coatings include:
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TiN for general wear resistance
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TiAlN for high-temp resistance
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TiCN for extreme environments
Designed for High-Precision Lathe Operations
1. Multi-Step Chip Flute Optimization
Our flutes are engineered for smooth chip evacuation without clogging-even in micro-holes or fine thermoplastics. This maintains drilling fluidity at high RPMs with minimal heat generation.
2. Optimized Step Transition Angles
The step transitions and tip geometries are designed to reduce axial stress, ensuring no deformation of thin materials. Perfect for drilling precious metals, gemstone carriers, or intricate horological components.
3. Performance Coatings for Extended Life
Application-specific coatings extend lifespan while ensuring consistent accuracy in multi-diameter drilling across the most demanding, high-precision tasks.
Packaging & Shipping
FAQ
Q1: What makes these HSS center drills ideal for diamond and jewelry applications?
A: Our HSS center drills are engineered with ultra-fine CNC grinding and vacuum heat treatment, ensuring micron-level accuracy and exceptional edge retention. These features are essential when drilling mountings or seating holes for diamonds, gemstones, or precision watch parts, where exact centering and clean finishes are critical.
Q2: Can they handle tough materials like platinum, titanium, or stainless steel?
A: Yes. These drills are made from premium M35 high-speed steel and processed with RS ESR (Rapid Solidification Electro-Slag Remelting), giving them superior toughness and thermal stability. They maintain sharpness and structural integrity when drilling hard or high-value metals common in fine jewelry and watchmaking.
Q3: Will these center drills damage delicate materials or cause burrs?
A: No. Each drill is finished with ultra-fine polishing and features optimized cutting geometry. This minimizes friction, reduces burr formation, and preserves the integrity of delicate surfaces like gold, silver, or thin-walled precious metal components.
Q4: Are there coating options for better performance in high-speed drilling?
A: Absolutely. You can choose from PVD coatings like TiAlN (for high heat resistance), TiCN (for extreme wear), or TiN (for general use). These coatings extend tool life and maintain accuracy in continuous, high-speed operations.
Q5: Do you offer custom sizes or geometries for specific diamond or gemstone settings?
A: Yes. We support custom step lengths, flute angles, and tip geometries tailored to your specific application-whether it's for micro-holes in watch dials, precise prong seats, or bespoke gemstone mounting.
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