
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 Drilling Across a Wide Application Range
These high-speed steel (HSS) center drill bits are specially designed for ultra-precise pre-drilling in diamond cutting tool preparation and metal lathe operations. Perfect for materials like aluminum, brass, mild steel, and alloyed metals, they ensure clean, accurate pilot holes with minimal burrs-critical for aligning and mounting diamond segments or inserts with absolute precision.
2. Multi-Diameter Capability with Built-In Deburring
Each center drill features a stepped geometry that allows for drilling multiple hole sizes in a single operation-ideal for machining layered or composite tool blanks. The smooth transitions between steps and integrated deburring capability ensure clean, concentric holes, minimizing the need for secondary processing and helping maintain strict dimensional tolerances required in diamond tool assembly.
3. Thermal Resistance for Longevity and Performance
Manufactured from high-quality HSS and enhanced through vacuum heat treatment, these center drills deliver exceptional edge retention and structural integrity. Their enhanced thermal performance ensures consistent accuracy even under high-speed, high-temperature conditions-ideal for prolonged use in precision grinding and diamond tool production lines.
4. Versatile Performance Across Industries
While optimized for diamond cutting applications, these HSS center drills are equally effective in metalworking, automotive, aerospace, and mold making. Whether you're preparing guide holes for EDM, grinding setups, or aligning inserts for diamond blades, their accuracy, strength, and thermal reliability make them essential tools for professionals demanding perfection.
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.
1. Razor-Sharp Cutting Edge for Clean Entry
Crafted from premium high-speed steel (HSS) and ground with CNC precision, these center drills feature ultra-sharp cutting edges for smooth and efficient penetration into metal surfaces. Their sharpness minimizes cutting resistance and burr formation, ensuring clean, concentric holes-essential for precise positioning in diamond cutting tool assembly.
2. Self-Centering Split Point for Accurate Starts
The anti-slip split point tip design eliminates the need for center punching and delivers immediate, walk-free starting-even on curved or hardened metal surfaces. This allows for excellent control and precision from the first contact, making it ideal for pilot holes used in diamond segment mounting or EDM preparation.
3. Step-by-Step Chip Evacuation for Smooth Operation
Each step in the drill is engineered with optimized spiral flutes to clear chips efficiently and reduce heat buildup. This design ensures smooth, uninterrupted drilling, especially under high-speed or production-intensive environments, such as those found in diamond tool fabrication.
4. Corrosion-Resistant and Long-Lasting Finish
These drills come with either a polished surface or a wear-resistant PVD coating (e.g., TiN), providing excellent protection against rust, wear, and coolant exposure. Perfect for workshops and production lines where coolants or lubricants are frequently used, ensuring stable, long-term performance.
5. Balanced Multi-Step Geometry for Efficiency and Versatility
The multi-step design enables drilling of multiple diameters in a single pass-ideal for creating tapered or pre-reaming holes used in diamond tooling. This reduces the need for tool changes and increases efficiency while maintaining superior balance and control, especially in lathe, milling, or CNC machining setups.
Why Choose Our Product?
1. Exceptional Wear Resistance & Thermal Stability
Our center drill bits are made from premium high-speed steel (HSS) and engineered to withstand the intense heat and friction encountered during diamond tool production and metal lathe operations. Their superior hardness ensures long-lasting sharpness and dimensional stability, even when repeatedly drilling into hardened metals and composite tool blanks-making them ideal for diamond segment pre-machining.
2. Multi-Diameter Drilling with Burr-Free Finishes
Designed with a precision-stepped geometry, each drill allows for multiple hole sizes in a single tool, eliminating unnecessary tool changes. This enables smooth diameter transitions and results in clean, burr-free holes, which are critical for mounting diamond inserts, cutters, or guide pins-saving time and enhancing final tool quality.
3. Professional-Grade Performance Across Applications
Whether you're manufacturing diamond saw blades, core drills, or PCD tool blanks, these center drills deliver consistent, high-precision results. Their excellent control, accuracy, and durability make them a go-to choice in metalworking, tool fabrication, mold making, and diamond cutting tool prep-where flawless alignment and repeatable accuracy are non-negotiable.
Our Advantages



Precision Manufacturing for Diamond Tool Preparation
1. CNC Precision Grinding
Each HSS center drill is manufactured using CNC precision grinding to ensure uniform step geometry, razor-sharp cutting edges, and accurate centering. This level of precision is critical for producing perfect pilot holes in metal blanks used for diamond segment mounting, ensuring minimal vibration and reliable tool alignment in high-speed lathe operations.
2. Vacuum Heat Treatment
To extend tool life and preserve geometry, each drill undergoes vacuum heat treatment, increasing both surface hardness and core toughness. This enhances performance during repeated cutting of hard materials like stainless steel and tool steel, which are often used in diamond cutting blade cores and reinforced inserts.
4. Ultra-Fine Polishing
A mirror-polished surface reduces cutting friction and heat buildup, aiding in chip evacuation and preventing workpiece surface damage-particularly important when drilling into thermoplastics, soft metals, or laminated diamond tool substrates.
Refined Metallurgy & Thermal Optimization
1. Advanced Steel Purification: EAF + LF + VD + RS-ESR
Our drills are crafted from ultra-clean HSS, refined through Electric Arc Furnace (EAF), Ladle Refining (LF), Vacuum Degassing (VD), and Rapid Solidification Electro-Slag Remelting (RS-ESR). This produces a steel matrix with minimal inclusions, excellent toughness, and uniform carbide distribution-ideal for high-precision applications like diamond tool positioning holes.
2. Integrated Thermal Optimization
Through a controlled process of quenching, cryogenic treatment, and precision tempering, our drills achieve up to HRC 67 hardness while resisting chipping and edge fatigue. This makes them exceptionally reliable for high-speed, long-duration drilling in diamond cutting production lines.
3. RS-ESR Edge Enhancement
The RS-ESR process improves cutting-edge durability by refining the structure with uniformly distributed carbides and cobalt, boosting resistance to thermal wear and maintaining consistent sharpness-even under intensive heat and axial load.
Customizable Engineering for Specialized Diamond Tool Needs
1. Material Flexibility - M35 as Core Material
While M2 and M42 options are available, we recommend M35 HSS for its balanced hardness and toughness, making it ideal for drilling in hardened alloy steel tool bases used in diamond tool manufacturing.
2. Tailored Step Geometry & Protective Coatings
We offer customizations in step size, flute length, and helix angle to meet application-specific needs. Optional PVD coatings such as:
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TiN - For general wear protection
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TiAlN - For high-heat, dry cutting conditions
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TiCN - For extreme wear environments
These coatings enhance tool life and reduce friction, particularly valuable in precision EDM preparation and mounting hole drilling.
Optimized Design for High-Precision Lathe Drilling
1. Multi-Step Flute Optimization
Engineered flute paths between steps ensure smooth chip removal and reduce heat accumulation. This is essential for drilling in thermoplastic holders, thin-walled structures, or layered metal composites used in advanced diamond tools.
2. Engineered Cutting Angles
Optimized point geometry and step transitions lower axial force, prevent material deformation, and deliver clean, concentric holes-a critical factor for flawless diamond segment alignment and reaming preparation.
3. Performance Coatings for Demanding Environments
For operations involving repetitive or dry drilling, our drills support high-performance coatings like TiAlN and TiCN, improving thermal resistance, edge wear protection, and maintaining dimensional accuracy in multi-diameter, high-speed lathe operations.
Packaging & Shipping



FAQ

Q1: Why are HSS center drills ideal for diamond cutting tool preparation?
A: HSS (High-Speed Steel) center drills offer exceptional wear resistance, thermal stability, and edge retention, making them perfect for drilling precise pilot holes in metal cores or tool substrates used for diamond segment mounting. Their stepped geometry and CNC-ground accuracy ensure flawless alignment-critical for diamond tools requiring high concentricity and minimal vibration.
Q2: What materials can these HSS center drills handle?
A: These drills are designed for precision drilling in stainless steel, tool steel, aluminum, brass, copper, and even laminated or coated materials commonly used in diamond blade and insert manufacturing. Their high red-hardness allows for stable performance in both soft and hardened metal substrates.
Q3: Can these center drills be used for high-speed lathe or CNC operations?
A: Absolutely. These center drills are specifically engineered for high-speed, high-precision lathe and CNC applications. Their vacuum heat-treated HSS composition and balanced multi-step design ensure excellent performance under thermal stress, even in continuous industrial production environments such as diamond tool fabrication lines.
Q4: Are custom sizes and coatings available for specialized diamond tooling setups?
A: Yes. We offer custom step sizes, flute lengths, helix angles, and coating options including TiN, TiAlN, and TiCN-tailored for high-temperature or high-wear applications. These options are particularly beneficial for users working with precision diamond cutting heads, PCD tool blanks, or complex geometries.
Q5: How do these center drills improve diamond cutting performance overall?
A: By delivering clean, burr-free pilot holes with high accuracy, these center drills ensure that diamond segments, blades, or inserts are perfectly aligned and securely mounted. This contributes to longer tool life, smoother cutting, and improved edge performance in downstream cutting operations.