Optimize Your Diamond Cutting with HSS-Powered Center Drills

• Customization: Available
• Customized: Customized
• Standard: GB/T
• Model NO.: HSS
• Length: Standard Length
• Type: Center Drill Bit
• Material: High Speed Steel
• Usage: Metal Drilling
• Unit Price: Contact Us to Get Latest Price
• Customized Support: OEM, ODM
• Application: Stainless Steel, Aluminum, Copper, Steel and Other
• Color: Customizable
• Transport Package: Plastic Box or Your Requriement
• Specification: Standard Sizes or Customized
• Trademark: ZEICIN
• Origin: China
• HS Code: 8207501000

Product Description

 

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

 

• Precision Engineered for Diamond and Gemstone Applications
  These high-speed steel (HSS) center drill bits are expertly designed for delicate, high-precision drilling-making them ideal for applications such as diamond setting, gemstone mountings, and fine jewelry fabrication. They provide clean, centered pilot holes with minimal burrs, ensuring smooth transitions into the next step of precision cutting.

  Multi-Step Drilling with Built-in Deburring
  Featuring a refined stepped design, each drill enables multi-diameter hole formation in a single operation-perfect for preparing tapered or recessed settings. The integrated deburring effect produces clean, polished hole edges, eliminating the need for additional finishing and preserving the integrity of precious materials.

  Thermally Stable and Long-Lasting Performance
  Constructed from premium HSS and enhanced with advanced heat treatment, these drills offer outstanding thermal resistance and edge retention. They maintain accuracy and strength when working with tough metals such as platinum, gold, titanium, and stainless steel-materials often used in high-end jewelry and luxury watches.

  Trusted Across High-Precision Industries
  Beyond jewelry and diamond work, these center drills are also widely used in aerospace, electronics, medical device manufacturing, and micro-machining. Their consistent performance and dimensional precision make them indispensable for tasks requiring absolute accuracy.

 

Six Key Features

1. Premium Material Selection - High-quality steel for extended lifespan.
2. Short Lead Time - Efficient production ensures quick delivery.
3. Fast Drilling Speed - Sharp cutting edge for rapid penetration.
4. Reliable Quality - Strict quality control for consistent performance.
5. Multiple Specifications - Various sizes to meet different needs.
6. High Fracture Resistance - Reinforced design prevents breakage.

 

Detailed Advantages

1. Razor-Sharp Cutting Edge for Precision Stone Settings
Made from premium high-speed steel (HSS), these center drill bits feature ultra-sharp, precision-ground edges that enable effortless penetration into hard metals such as platinum, titanium, and white gold. The minimized cutting resistance ensures crisp, burr-free holes-critical for flawless diamond mount preparation and clean setting edges.

2. Self-Centering Split Point for Micron-Level Accuracy
The split point tip provides immediate, accurate centering without wandering, even on domed or polished surfaces. This walk-free design eliminates the need for center punching, ensuring pinpoint starts that preserve the structural integrity of delicate jewelry components or gemstone seats.

3. Optimized Chip Evacuation with Spiral Flute Geometry
Engineered with a spiral flute profile, these drills effectively remove chips at each step to prevent clogging and reduce heat buildup. This ensures a cooler cut and smoother finish-especially important when working with thin-walled parts, precious metals, or thermally sensitive materials during high-speed rotary operations.

4. Protective Coating for Corrosion Resistance
Finished with titanium or polished coatings, the drills resist rust and wear even in environments exposed to lubricants or polishing agents. This increases tool lifespan and helps maintain a pristine cut edge on metals used in luxury settings.

5. Multi-Stage Step Design for Versatile Drilling
The balanced multi-step structure enables progressive hole sizing in a single pass, allowing for efficient seat formation or tiered drilling. It eliminates tool changes, maintains control, and supports precise reaming or tapping in fine jewelry, watchmaking, and micromechanical tasks.

 

 

Why Choose Our Product?

1. Exceptional Wear Resistance & Heat Stability for Precious Metals
Crafted from premium-grade high-speed steel (HSS), our center drill bits are built to endure the intense friction and heat common in fine metalworking and jewelry fabrication. Whether you're drilling platinum, titanium, or gold, the bits retain their edge and structural integrity, delivering repeatable precision with minimal tool degradation-ideal for creating clean seats in gemstone settings.

2. Multi-Diameter Drilling with Seamless Transitions
The stepped geometry enables precise, graduated hole sizing in one tool pass-perfect for preparing tapered or countersunk holes in fine jewelry and diamond mounts. The clean-cut transitions eliminate burrs and reduce the need for additional polishing or finishing, preserving material integrity and saving bench time.

3. Professional Precision Across Jewelry & Watchmaking Applications
These center drills are trusted by jewelers, engravers, and watchmakers for tasks requiring micrometer-level accuracy. From preparing pilot holes in delicate rings to creating centers for gemstone settings, their sharpness and stability ensure optimal results-supporting intricate work where both aesthetics and structural soundness are critical.

 

Our Advantages

CNC Precision Grinding for Jewelry-Grade Accuracy

Our HSS center drills are manufactured through advanced CNC grinding technology to ensure razor-sharp edges, perfect concentricity, and uniform step dimensions. This delivers minimal vibration and superior stability-ideal for drilling starter holes or seating zones in diamond mountings, bezels, or prongs where absolute precision is vital.

Vacuum Heat Treatment for Premium Tool Life

Each center drill is vacuum heat-treated to boost both surface hardness and internal strength. This ensures long-lasting cutting edges that can handle hard materials commonly used in luxury jewelry, such as platinum, white gold, titanium, and stainless steel, all while withstanding high-speed operations without losing integrity.

Ultra-Fine Mirror Polishing for Surface Protection

A mirror-level polished finish reduces friction and heat buildup, enabling smooth, clean entry even on soft or precious metals. This finish helps prevent surface scratches and deformation during gemstone setting-preserving the integrity of fine jewelry designs and high-value workpieces.

 

Metallurgical & Thermal Enhancements for Jewelry Applications

1. Purified High-Speed Steel (HSS) via Advanced Refining

Crafted from ultra-clean M35 HSS using Electric Arc Furnace (EAF), Ladle Refining (LF), Vacuum Degassing (VD), and Electro-Slag Remelting (ESR), our drills maintain high purity for consistent edge performance, especially important when dealing with layered alloys or delicate multi-metal components.

2. Heat-Treated for Precision Drilling Stability

Quenching, cryogenic treatment, and fine tempering raise hardness to HRC 67 while preventing edge chipping or tip breakage. These properties are key when drilling pre-cuts for diamond settings, as they allow for precise control without damaging adjacent metalwork.

3. RS ESR Edge Reinforcement

Rapid Solidification ESR technology distributes carbides and cobalt uniformly across the cutting edge. This delivers extended edge retention and resistance to thermal softening-ideal for continuous use in high-load precision settings and repetitive jewelry production runs.

 

Flexible Design Options to Match Your Craft

1. M35-Centric Material for Toughness and Accuracy

While M2 and M42 steel options are available, we emphasize M35 for its excellent wear resistance and cutting consistency-perfect for fine metalworking tasks where both precision and finish matter most.

2. Custom Step & Coating Configurations

Choose from customized flute lengths, angles, and step geometries to match your lathe and task. Optional coatings like TiN, TiAlN, and TiCN extend lifespan and reduce friction-allowing smooth hole preparation in thermally sensitive materials like gold or thin silver sheet.

 

Specialty Features for Diamond Cutting & Gem Setting

• Multi-Step Flute Optimization: Designed for smooth chip evacuation, avoiding build-up or clogging during micro-drilling.

• Precision Cutting Angles: Tip geometry minimizes axial pressure, helping maintain structural stability when drilling close to stone seats or prong positions.

• Surface-Safe Coatings: Enhanced with protective coatings to maintain edge quality while avoiding scratches or marring on reflective jewelry surfaces.

 

Packaging & Shipping

FAQ

Q1: Are these HSS center drills suitable for drilling precious metals like gold or platinum?
A: Yes. Our HSS center drills are specifically heat-treated and ultra-finely polished to handle delicate materials like gold, platinum, silver, and titanium without causing surface damage, burrs, or deformation.

 

Q2: Can I use these drills to prepare pilot holes for diamond or gemstone settings?
A: Absolutely. The CNC-ground, self-centering tips allow for high-precision pilot drilling-perfect for pre-cutting prong holes, seatings, or bezels in gemstone and diamond settings.

 

Q3: Do these drills reduce the risk of chipping or cracking during jewelry work?
A: Yes. Thanks to vacuum heat treatment and cryogenic processing, the drills maintain high core toughness and wear resistance. This minimizes tip breakage and edge chipping during high-speed or fine-detail drilling.

 

Q4: What makes these drills different from regular center drill bits?
A: These are engineered for micro-precision. They feature fine flute geometry for smooth chip evacuation, ESR edge enhancement for long-lasting sharpness, and coatings tailored to reduce friction and preserve jewelry surfaces.

 

Q5: Are custom sizes or coatings available for specialized diamond setting applications?
A: Yes. We offer customizable flute lengths, step geometries, helix angles, and optional PVD coatings (e.g., TiN, TiAlN, TiCN) to suit specific needs in fine jewelry, watchmaking, or small-component fabrication.