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Our 55HRC center drill bit is specifically engineered for precision starting holes in hardened materials. Designed for high-speed CNC applications, this carbide center drill bit offers superior heat resistance and wear-resistant properties, making it the ideal center drill bit for metal—especially alloy steel, cast iron, and stainless steel. Each bit features a precision-ground 60 degree center drill bit tip to ensure perfect alignment and prevent walking during the initial cut.
We provide a comprehensive range of center drill bit sizes to meet strict industrial tolerances. Whether you require a single hss center drill bit for general tasks or a professional center drill bit set for diverse workshop needs, our tools deliver exceptional stability. For automated setups, our self center drill bit set ensures consistent accuracy. From custom center drill bit angle requirements to specialized left handed center drill bit options, HNCarbide provides the durability and precision necessary for mastering how to center drill bit in hole perfectly every time.
Grade HN40 is made from submicron WC powder, some speclal additlves added to optimize theproperties with good combination of hardness and toughness.
Its suitable for making drills and miling tools for machining stainless steel, tool steel and heat-resistingalloys.
| Grade | Cobalt content % | Grain size | Density g/cm³ | Hardness HRA | Hardness HV30 | MPa Transverse rupture strength | MPa ·m1/2 Fracture toughness MPa ·m1/2 |
|---|---|---|---|---|---|---|---|
| HN40 | 10 | 0.8 | 14.45 | 91.8 | 1,580 | 3,600 | 11.8 |
| Scientific name | Composition | Physical properties | Features | Typical applications |
|---|---|---|---|---|
| TiSiN | Ti (titanium): main element, forms TiN nanocrystalline phase. Si (silicon): usually 6–10%, forms amorphous Si₃N₄ phase, refines grains and increases hardness. N (nitrogen): combines with Ti and Si to form a composite structure. | Colour: TiSiN coatings usually appear bronze or dark grey-bronze; exact colour depends on Si content, deposition process (such as PVD) and thickness (1–4 μm). Hardness: 34–42 GPa (≈3400–4200 HV). Friction coefficient: 0.3–0.6 (against steel). Temperature resistance: 1000–1200°C (oxidation resistance). Coating thickness: 1–5 μm (typically 2–3 μm). Deposition temperature: 200–400°C (suitable for carbide tools). | Ultra-high hardness: amorphous Si₃N₄ phase suppresses dislocation movement, giving much higher hardness than TiN (~23 GPa) and TiAlN (~35 GPa). High-temperature stability: suitable for dry cutting and high-speed machining (e.g. quenched steels HRC 60+). Anti-adhesion: reduces built-up edge when machining aluminium alloys, stainless steels and other sticky materials. | Tool coatings: drills, mills (especially suitable for PCB routers, tool life increased by 2–3 times). High-speed cutting of quenched steels, titanium alloys and high-nickel alloys. Mould strengthening: die-casting moulds and stamping dies, improving wear resistance. Industrial parts: piston rings and other high-temperature wear parts. |
A center drill bit is a specialized tool designed to create a precise, conical starting hole on the face of a workpiece. Its primary purpose is to provide a rigid pilot point that prevents standard twist drills from "walking" or drifting off-center. In CNC machining, using a carbide center drill bit ensures that subsequent drilling operations follow a perfectly aligned path, which is crucial for maintaining tight tolerances and preventing tool breakage.
The choice depends on your workpiece material and production volume:
HSS Center Drill Bit: Best for general-purpose applications on softer steels, brass, and aluminum. It is tough, less prone to snapping under manual pressure, and more cost-effective.
Carbide Center Drill Bit: Essential for high-speed production and hardened materials (up to 55HRC). It offers superior heat resistance and maintains a sharp edge longer, making it the preferred center drill bit for metal in automated CNC environments.
Investing in a center drill bit set or a self center drill bit set provides versatility for various projects. Instead of pausing production to find a specific diameter, a set ensures you have multiple center drill bit sizes ready for different hole requirements. For professional workshops, having a complete set of both HSS and carbide options allows for seamless transitions between different workpiece materials.
Yes. We can produce non-standard tools according to your drawings, samples or machining requirements (material, coating, size, tolerance and application). Our engineers will evaluate and provide a quotation and lead time.
For serious buyers and distributors, we can offer free standard samples if in stock. Usually you only need to cover the freight cost. For customized tools, a sample fee may apply, which can be refunded or deducted in bulk orders.
Yes.
Regional or customer protection based on sales targets, avoiding price wars among our partners.
Catalogs, brochures, product photos, technical data sheets, online materials.
For key partners, joint promotion, exhibitions and digital marketing support.
Safety stock for fast-moving items and forecast-based production.
Priority production and regular shipments to reduce stock-out risk.
Clear quality warranty policy, quick response to claims.
Replacement, credit or other solutions after confirmation of issues.
Tool selection and cutting parameter advice.
Problem analysis for different materials and machines.
Online training, documents, and when possible, on-site support for key accounts.
Engineered for high-efficiency machining, our 55HRC center drill bit is optimized for aluminum alloys and non-ferrous metals. This premium carbide center drill bit features ultra-fine grain substrates and specialized flute geometries to prevent chip clogging and built-up edge. Whether you are using a standard 60 degree center drill bit for lathe centering or require specific center drill bit sizes for CNC production, our tools ensure a clean, burr-free finish.
Beyond standard aluminum tasks, this tool serves as a versatile center drill bit for metal and high-grade center drill bit for wood projects requiring extreme precision. Our inventory includes the heavy-duty hss center drill bit for general use and the comprehensive self center drill bit set for specialized manufacturing. From adjusting the center drill bit angle for custom entries to utilizing a left handed center drill bit, HNCarbide helps you master how to center drill bit in hole with professional-grade accuracy. Invest in a complete center drill bit set to elevate your workshop’s performance.
Grade HN40 is made from submicron WC powder, some speclal additlves added to optimize theproperties with good combination of hardness and toughness.
Its suitable for making drills and miling tools for machining stainless steel, tool steel and heat-resistingalloys.
| Grade | Cobalt content % | Grain size | Density g/cm³ | Hardness HRA | Hardness HV30 | MPa Transverse rupture strength | MPa ·m1/2 Fracture toughness MPa ·m1/2 |
|---|---|---|---|---|---|---|---|
| HN40 | 10 | 0.8 | 14.45 | 91.8 | 1,580 | 3,600 | 11.8 |
A center drill bit is a specialized tool designed to create a precise, conical starting hole on the face of a workpiece. Its primary purpose is to provide a rigid pilot point that prevents standard twist drills from "walking" or drifting off-center. In CNC machining, using a carbide center drill bit ensures that subsequent drilling operations follow a perfectly aligned path, which is crucial for maintaining tight tolerances and preventing tool breakage.
The choice depends on your workpiece material and production volume:
HSS Center Drill Bit: Best for general-purpose applications on softer steels, brass, and aluminum. It is tough, less prone to snapping under manual pressure, and more cost-effective.
Carbide Center Drill Bit: Essential for high-speed production and hardened materials (up to 55HRC). It offers superior heat resistance and maintains a sharp edge longer, making it the preferred center drill bit for metal in automated CNC environments.
Investing in a center drill bit set or a self center drill bit set provides versatility for various projects. Instead of pausing production to find a specific diameter, a set ensures you have multiple center drill bit sizes ready for different hole requirements. For professional workshops, having a complete set of both HSS and carbide options allows for seamless transitions between different workpiece materials.
Yes. We can produce non-standard tools according to your drawings, samples or machining requirements (material, coating, size, tolerance and application). Our engineers will evaluate and provide a quotation and lead time.
For serious buyers and distributors, we can offer free standard samples if in stock. Usually you only need to cover the freight cost. For customized tools, a sample fee may apply, which can be refunded or deducted in bulk orders.
Yes.
Regional or customer protection based on sales targets, avoiding price wars among our partners.
Catalogs, brochures, product photos, technical data sheets, online materials.
For key partners, joint promotion, exhibitions and digital marketing support.
Safety stock for fast-moving items and forecast-based production.
Priority production and regular shipments to reduce stock-out risk.
Clear quality warranty policy, quick response to claims.
Replacement, credit or other solutions after confirmation of issues.
Tool selection and cutting parameter advice.
Problem analysis for different materials and machines.
Online training, documents, and when possible, on-site support for key accounts.
HNCarbide center drill bit tools are widely used in automotive, mold and die, aerospace, and general engineering workshops. From creating precise starting points in heavy machinery to fine detail work, they provide stable cutting on diverse materials. Our range includes the specialized center drill bit for metal for hardened alloys and the center drill bit for wood for cabinetry and furniture manufacturing.
We supply dedicated options such as the self center drill bit for high-accuracy positioning and the left handed center drill bit for specific machine rotations. Compared to standard drills, our center drill bit set reduces the risk of tool breakage and extends tool life in continuous production. We support both metric and inch standards, helping you cover different machines with one consistent tool family. If you need a complete self center drill bit set or customized coatings, HNCarbide delivers the perfect solution for your workshop.
Each HNCarbide center drill bit is manufactured from premium fine-grain solid carbide and finished on advanced CNC grinding centers to ensure accurate geometry and smooth cutting edges. Our carbide center drill bit series is engineered with an optimized flute design that ensures reliable chip evacuation, even during high-speed operations. This precision is critical for mastering how to center drill bit in hole tasks without deviation.
Our portfolio includes a wide range of center drill bit sizes and professional hss center drill bit options to match different hardness ranges. Whether you require a standard 60 degree center drill bit or a specialized self center drill bit set for automated production, our tools provide consistent performance. Strict inspection and ISO-based process control keep the center drill bit angle, diameter, and runout within tight tolerances, ensuring reliable quality from batch to batch.
We Are Commited To Providing High-Quality, Customized solutions At An Affordable price While Also Prioritizing sustainability And ExcellentCustomer Service, These Qualities Make Us A Great choice For Your Center Drill Bit Needs
We Only Use unground tungsten carbide rods with HlP sintering and100% virgin material. Our grade includes lsO K05 to K40, frommachining carbon steel to aluminium, non-ferrous metals andtitanium or we develop grade for your applications.
As a HNCarbide customer, you can enjoy five-axis high-precisiongrinding machines from Australia’s ANCA or Germany’s Walter. Themodern workshop with constant temperature and humidity ensuresthe accuracy of each Center Drill Bit.
Each of your tungsten Center Drill Bit will be sandblasted to effectively remove burrs and improve the finish.
All HNCarbide’s Center Drill Bit will be monitored on WALTER HELICHEEK andZOLLER GENlUS 3 to ensure that every dimension is qualified. We arecommitted to controlling the tolerance within 3 UM.
At HNCarbide, every shipment is meticulously packaged to ensure your tools arrive intact.
Each HNCarbide’s Center Drill Bit is individually placed in a shock-resistant protective case, labeled with complete specifications, and sealed in moisture-proof packaging material before being boxed.
Large-volume orders are reinforced with double-wall cardboard boxes or wooden crates to maximize safety during international shipping.
We collaborate with reliable logistics partners to ensure goods are delivered quickly and securely to their destination via air freight, sea freight, or express courier.
A center drill bit is a specialized tool designed to create a precise, conical starting hole on the face of a workpiece. Its primary purpose is to provide a rigid pilot point that prevents standard twist drills from "walking" or drifting off-center. In CNC machining, using a carbide center drill bit ensures that subsequent drilling operations follow a perfectly aligned path, which is crucial for maintaining tight tolerances and preventing tool breakage.
The choice depends on your workpiece material and production volume:
HSS Center Drill Bit: Best for general-purpose applications on softer steels, brass, and aluminum. It is tough, less prone to snapping under manual pressure, and more cost-effective.
Carbide Center Drill Bit: Essential for high-speed production and hardened materials (up to 55HRC). It offers superior heat resistance and maintains a sharp edge longer, making it the preferred center drill bit for metal in automated CNC environments.
Investing in a center drill bit set or a self center drill bit set provides versatility for various projects. Instead of pausing production to find a specific diameter, a set ensures you have multiple center drill bit sizes ready for different hole requirements. For professional workshops, having a complete set of both HSS and carbide options allows for seamless transitions between different workpiece materials.
Yes. We can produce non-standard tools according to your drawings, samples or machining requirements (material, coating, size, tolerance and application). Our engineers will evaluate and provide a quotation and lead time.
For serious buyers and distributors, we can offer free standard samples if in stock. Usually you only need to cover the freight cost. For customized tools, a sample fee may apply, which can be refunded or deducted in bulk orders.
Yes.
Regional or customer protection based on sales targets, avoiding price wars among our partners.
Catalogs, brochures, product photos, technical data sheets, online materials.
For key partners, joint promotion, exhibitions and digital marketing support.
Safety stock for fast-moving items and forecast-based production.
Priority production and regular shipments to reduce stock-out risk.
Clear quality warranty policy, quick response to claims.
Replacement, credit or other solutions after confirmation of issues.
Tool selection and cutting parameter advice.
Problem analysis for different materials and machines.
Online training, documents, and when possible, on-site support for key accounts.
In the world of precision engineering, the difference between a successful project and a costly mistake often lies in the first few seconds of operation. This is where the center drill bit plays its most critical role. Whether you are a hobbyist working in a home garage or a professional machinist in a high-speed CNC facility, understanding the nuances of this tool is essential for achieving perfect hole alignment.
In this comprehensive guide, we will explore everything from center drill bit sizes to advanced applications for metal and wood.
To start with the basics, what is a center drill bit? Often referred to as a Slocombe drill, it is a short, stiff tool designed to create a conical indentation on the face of a workpiece. Unlike a standard twist drill, which may "walk" or wander across a surface when starting a hole, a center drill is rigid enough to stay exactly where it is placed.
This indentation serves two primary purposes:
It provides a guided starting point for a larger drill bit.
It creates a bearing surface for a lathe center to support the workpiece during rotation.
The material of your tool determines its longevity and performance under heat.
HSS Center Drill Bit: High-Speed Steel is the industry standard for general-purpose machining. It offers excellent toughness and is cost-effective for manual lathes and softer materials.
Carbide Center Drill Bit: For high-production environments or hardened materials (like those rated at 55HRC), a carbide center drill bit is the superior choice. It maintains its cutting edge at much higher temperatures and offers the rigidity needed for exotic alloys.
Selecting the correct size is not just about the diameter of the hole. Center drill bit sizes are typically designated by numbers (e.g., #1, #2, #3). Each size corresponds to a specific pilot diameter and body diameter. Using a bit that is too small for a heavy workpiece can lead to tool breakage, while one that is too large may compromise the structural integrity of the part.
Furthermore, the center drill bit angle is a critical technical specification. The most common is the 60 degree center drill bit, which matches the standard 60-degree angle of most lathe dead and live centers. However, specialized angles are available for specific industrial requirements.
Modern machining often requires more than just a standard tool.
Self Center Drill Bit: Often used in woodworking and cabinetry, a self center drill bit (sometimes called a Vix bit) features a spring-loaded guide that centers the bit perfectly within a hinge or hardware hole.
Self Center Drill Bit Set: For professionals, owning a self center drill bit set ensures you have the right guide size for various hardware types, from small drawer pulls to heavy-duty door hinges.
Left Handed Center Drill Bit: In certain CNC setups or for specific extraction tasks, a left handed center drill bit is required to match the spindle rotation or to help remove broken fasteners.
While the physics remains similar, the tool geometry changes based on the material:
Center Drill Bit for Metal: These are designed with specific flute clearances to handle the chips generated by steel, aluminum, and brass. They are built to withstand the friction and heat of metal-on-metal contact.
Center Drill Bit for Wood: These focus on clean entry and preventing "tear-out." A center drill bit for wood helps ensure that decorative hardware is mounted perfectly flush and centered.
Many beginners struggle with accuracy. Here is a quick guide on how to center drill bit in hole operations:
Preparation: Ensure your workpiece is securely clamped. Even a microscopic vibration can cause the bit to snap.
Speed (RPM): Center drills usually require higher RPMs because the tip diameter is very small.
Lubrication: Especially when using a center drill bit for metal, use cutting oil to reduce heat.
Depth: Do not drill too deep. Only the tapered portion should engage the material to create the 60-degree seat.
For any workshop, buying a center drill bit set is more economical than purchasing individual bits. A high-quality set from a trusted supplier like HNCarbide ensures that you have a range of center drill bit sizes ready for any material—be it steel, aluminum, or timber.
Whether you need the extreme hardness of a carbide center drill bit or the versatility of a self center drill bit set, choosing the right tool is the first step toward machining excellence. By matching the tool material, angle, and size to your specific project, you ensure precision, safety, and a professional finish.
With over 20 years of experience in the cutting tool industry, we specialize in manufacturing best drill bits for steel applications. Our products are engineered for high-precision drilling in steel plate, steel beams, and steel bolts, meeting the demanding requirements of industrial and professional users.
Through long-term cooperation with global customers and continuous participation in international trade fairs, we have developed a deep understanding of what are the best drill bits for steel in real machining environments. We provide stable OEM and ODM solutions, including customized geometries, coatings, and specifications, helping customers achieve reliable drilling performance across different steel and metal applications.
Before you go, please note that we offer the most up-to-date industry research reports and the most comprehensive product catalogs, so please contact us if you are interested!
Before you go, please note that we offer the most up-to-date industry research reports and the most comprehensive product catalogs, so please contact us if you are interested!
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