Skip to content The ALCrN-coated 1 2 inch drill bit with coolant holes is engineered for high-efficiency drilling in demanding metalworking applications. With a precise 1 2 inch (12.7 mm) diameter, it delivers excellent hole accuracy and stable cutting performance.
The advanced ALCrN coating provides superior heat resistance and wear protection, making this 1 2 inch drill bit for metal ideal for drilling steel and hardened steel at higher speeds. Integrated coolant holes ensure effective cooling and chip evacuation, especially in deep-hole and continuous CNC drilling operations.
Available in standard and extra long 1 2 inch drill bit options, this tool supports customized lengths, shanks, and tolerances for OEM and industrial use.
3D
EDP No. | Fractional | Metric (D1, mm) | Flute Length L1 (mm) | Shank Diameter D2 (mm) | Overall Length L2 (mm) |
DB310032 | 1/2 | 12.7 | 60 | 14 | 107 |
5D
EDP No. | Fractional | Metric (D1, mm) | Flute Length L1 (mm) | Shank Diameter D2 (mm) | Overall Length L2 (mm) |
DB510032 | 1/2 | 12.7 | 77 | 14 | 124 |
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 |
|---|---|---|---|---|
| ALCRN | Al: 18–32% Cr: 10–25% N: 45–57% | Hardness: 2800–3200 HV (≈30–32 GPa) Thickness: 1–5 μm (typically 3–4 μm in applications) Oxidation temperature: 1000–1100°C (short-term up to 1100°C) Deposition temperature: ＜500°C (suitable for HSS and carbide substrates) | Red hardness: maintains hardness even at 1100°C, better than TiAlN (whose hardness drops above about 900°C). Adhesion: critical load up to 40 N (with optimized process). Wear resistance: suitable for high-speed cutting and dry machining, especially effective on stainless steels and alloy steels. | Cutting tools: end mills, gear cutters, drills (e.g. Balinit Alcorna series). Moulds: aluminium die-casting moulds, stamping tools. Industrial parts: piston rings, high-temperature wear-resistant parts (combined with suitable interlayer design). |
Our 1 2 Inch Drill Bit drawings clearly show key 1 2 Inch Drill Bit dimensions such as diameter, radius, flute length and overall length. This helps you confirm the right 1 2 Inch Drill Bit sizes for your CNC setup and machining depth before ordering.
A 1 2 inch drill bit has a diameter of 12.7 mm. This is the exact metric conversion of 1/2 inch. While 12 mm or 13 mm drill bits are sometimes used as alternatives, they are not exact equivalents and should not replace a 12.7 mm drill bit in precision machining.
A 1 2 inch drill bit is suitable for a wide range of materials, including:
Steel and alloy steel
Hardened steel (with proper coating)
Aluminum and non-ferrous metals
Wood
Concrete (with carbide-tipped designs)
Selecting the correct material and coating is critical for performance and tool life.
A 1 2 inch drill bit with coolant holes is recommended for:
Deep-hole drilling
High-speed CNC operations
Continuous production
A 1 2 inch drill bit without coolant holes offers higher rigidity and is ideal for:
Shallow to medium-depth drilling
Dry cutting or external coolant use
The choice depends on drilling depth, material, and machine capability.
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.
The ALCrN-coated 1 2 inch drill bit without coolant holes is designed for reliable and efficient drilling in general metalworking applications. With a precise 1 2 inch (12.7 mm) diameter, it ensures consistent hole size and stable cutting performance.
The high-performance ALCrN coating offers excellent heat and wear resistance, making this 1 2 inch drill bit for metal suitable for drilling steel and hardened steel under dry or external coolant conditions. The solid drill body without internal coolant holes provides increased rigidity, making it ideal for standard-depth drilling and stable CNC operations.
Available in standard and extra long 1 2 inch drill bit options, this tool supports customized lengths, shank types, and tolerances for OEM and industrial use.
3D
EDP No. | Fractional | Metric (D1, mm) | Flute Length L1 (mm) | Shank Diameter D2 (mm) | Overall Length L2 (mm) |
DB301032 | 1/2 | 12.7 | 60 | 14 | 107 |
5D
EDP No. | Fractional | Metric (D1, mm) | Flute Length L1 (mm) | Shank Diameter D2 (mm) | Overall Length L2 (mm) |
DB501032 | 1/2 | 12.7 | 77 | 14 | 124 |
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 |
|---|---|---|---|---|
| ALCRN | Al: 18–32% Cr: 10–25% N: 45–57% | Hardness: 2800–3200 HV (≈30–32 GPa) Thickness: 1–5 μm (typically 3–4 μm in applications) Oxidation temperature: 1000–1100°C (short-term up to 1100°C) Deposition temperature: ＜500°C (suitable for HSS and carbide substrates) | Red hardness: maintains hardness even at 1100°C, better than TiAlN (whose hardness drops above about 900°C). Adhesion: critical load up to 40 N (with optimized process). Wear resistance: suitable for high-speed cutting and dry machining, especially effective on stainless steels and alloy steels. | Cutting tools: end mills, gear cutters, drills (e.g. Balinit Alcorna series). Moulds: aluminium die-casting moulds, stamping tools. Industrial parts: piston rings, high-temperature wear-resistant parts (combined with suitable interlayer design). |
Our 1 2 Inch Drill Bit drawings clearly show key 1 2 Inch Drill Bit dimensions such as diameter, radius, flute length and overall length. This helps you confirm the right 1 2 Inch Drill Bit sizes for your CNC setup and machining depth before ordering.
A 1 2 inch drill bit has a diameter of 12.7 mm. This is the exact metric conversion of 1/2 inch. While 12 mm or 13 mm drill bits are sometimes used as alternatives, they are not exact equivalents and should not replace a 12.7 mm drill bit in precision machining.
A 1 2 inch drill bit is suitable for a wide range of materials, including:
Steel and alloy steel
Hardened steel (with proper coating)
Aluminum and non-ferrous metals
Wood
Concrete (with carbide-tipped designs)
Selecting the correct material and coating is critical for performance and tool life.
A 1 2 inch drill bit with coolant holes is recommended for:
Deep-hole drilling
High-speed CNC operations
Continuous production
A 1 2 inch drill bit without coolant holes offers higher rigidity and is ideal for:
Shallow to medium-depth drilling
Dry cutting or external coolant use
The choice depends on drilling depth, material, and machine capability.
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.
The 1 2 inch drill bit is widely used in industrial drilling applications including steel fabrication, machinery manufacturing, construction, and woodworking. With a standard 12.7 mm diameter, it is suitable for drilling large, precise holes in metal, steel, wood, and concrete.
HNCarbide supplies 1 2 inch drill bit for metal and steel machining, as well as solutions for wood and general-purpose drilling. Available in standard and extra long 1 2 inch drill bit designs, our tools support CNC machines, radial drills, and heavy-duty equipment, helping manufacturers improve efficiency and hole consistency.
Each 1 2 inch drill bit is manufactured using high-quality materials and precision grinding processes to ensure excellent accuracy and long tool life. Optimized cutting edges and flute geometry provide stable drilling performance and efficient chip evacuation.
With advanced coatings such as ALCrN, our 1 2 inch drill bit for steel and hardened steel offers superior wear resistance and heat stability, even under high-speed or continuous drilling conditions. Custom options including shank types, lengths, and tolerances are available to meet different machining requirements.
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 1 2 Inch Drill Bit Needs
We Only Use unground tungsten carbide rods with HlP sintering and 100% 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 1 2 Inch Drill Bit.
Each of your tungsten 1 2 Inch Drill Bit will be sandblasted to effectively remove burrs and improve the finish.
All HNCarbide’s 1 2 Inch Drill Bit will be monitored on WALTER HELICHEEK and ZOLLER 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 1 2 Inch 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 1 2 inch drill bit has a diameter of 12.7 mm. This is the exact metric conversion of 1/2 inch. While 12 mm or 13 mm drill bits are sometimes used as alternatives, they are not exact equivalents and should not replace a 12.7 mm drill bit in precision machining.
A 1 2 inch drill bit is suitable for a wide range of materials, including:
Steel and alloy steel
Hardened steel (with proper coating)
Aluminum and non-ferrous metals
Wood
Concrete (with carbide-tipped designs)
Selecting the correct material and coating is critical for performance and tool life.
A 1 2 inch drill bit with coolant holes is recommended for:
Deep-hole drilling
High-speed CNC operations
Continuous production
A 1 2 inch drill bit without coolant holes offers higher rigidity and is ideal for:
Shallow to medium-depth drilling
Dry cutting or external coolant use
The choice depends on drilling depth, material, and machine capability.
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.
A 1 2 inch drill bit is one of the most commonly used large-diameter drill bits in industrial and construction applications. Known for its versatility and strength, this drill bit size is widely used for drilling metal, steel, wood, and concrete. In this guide, we will explain what a 1 2 inch drill bit is, its size in millimeters, common applications, material compatibility, coating options, and how to choose the right one for your project.
A 1 2 inch drill bit refers to a drill bit with a diameter of 1/2 inch, which is equivalent to 12.7 mm. This size is part of the imperial (inch-based) measurement system and is widely used in the United States, Canada, and other markets that follow imperial standards.
1/2 inch = 12.7 mm
Metric equivalent: often compared with 12 mm or 13 mm, but not interchangeable in precision machining
Because of its large diameter, a 1 2 inch drill bit is commonly used where strength, stability, and accurate hole size are required.
The 1 2 inch drill bit is designed for heavy-duty and professional applications rather than light DIY work.
A 1 2 inch drill bit for metal is widely used in:
Structural steel fabrication
Machinery manufacturing
Automotive and heavy equipment parts
When drilling metal, especially alloy steel, coating and material quality are critical to tool life and performance.
For tougher materials, a 1 2 inch drill bit for steel or hardened steel is typically made from solid carbide or premium HSS with advanced coatings such as ALCrN. These drill bits offer higher heat resistance and wear protection during high-speed CNC drilling.
A 1 2 inch drill bit for wood is often used in:
Timber construction
Furniture manufacturing
Heavy woodworking projects
Wood drilling usually requires optimized flute design for fast chip removal and clean hole edges.
A 1 2 inch drill bit for concrete is commonly used with hammer drills or rotary hammers. These drill bits are typically carbide-tipped and designed to withstand impact and abrasion.
An extra long 1 2 inch drill bit is used for deep-hole drilling applications, such as:
Thick steel plates
Structural beams
Pipeline and construction components
Longer drill bits require good rigidity and often benefit from internal coolant or external cooling systems.
Some users look for a 1 2 inch drill bit with a 3/8 shank, mainly for compatibility with specific drilling machines. However, due to the large cutting diameter, most industrial 1 2 inch drill bits use a 1/2 inch or larger shank for safety and stability.
A 1 2 inch drill bit with coolant holes allows cutting fluid to reach the cutting edges directly. This improves:
Heat control
Chip evacuation
Tool life
Coolant-hole designs are ideal for CNC drilling, deep holes, and continuous production.
A 1 2 inch drill bit without coolant holes offers higher rigidity and is suitable for:
Shallow to medium-depth drilling
Dry cutting or external coolant use
General-purpose machining
Choosing between the two depends on drilling depth, material, and machine setup.
Coatings significantly affect the performance of a 1 2 inch drill bit.
An ALCrN-coated 1 2 inch drill bit is ideal for:
Steel and hardened steel
High-speed machining
High-temperature environments
ALCrN coatings offer excellent oxidation resistance and maintain hardness at elevated temperatures.
Other coatings such as TiN or TiAlN may also be used depending on the application, but ALCrN is often preferred for demanding industrial use.
Many buyers ask about the 1 2 inch drill bit equivalent in metric sizes. While 12.7 mm is the exact conversion, some applications may use:
12 mm drill bits (undersize)
13 mm drill bits (oversize)
For precision machining, especially in CNC operations, it is strongly recommended to use a true 1 2 inch (12.7 mm) drill bit rather than a close metric substitute.
When selecting a 1 2 inch drill bit, consider the following factors:
Material to be drilled – metal, steel, wood, or concrete
Drilling depth – standard or extra long length
Machine type – CNC, radial drill, or manual drilling
Cooling method – with or without coolant holes
Coating requirements – ALCrN for high performance
For industrial and OEM users, customized drill bit geometry, coating, and tolerance control can significantly improve productivity.
The 1 2 inch drill bit is a powerful and versatile tool widely used across metalworking, construction, and woodworking industries. With a precise 12.7 mm diameter, it offers strength, stability, and accuracy for large-hole drilling applications. Whether you need a 1 2 inch drill bit for metal, steel, wood, or concrete, choosing the right material, coating, and design is essential for optimal performance.
For professional users and manufacturers, working with an experienced cutting tool supplier ensures consistent quality, customization options, and long-term reliability.
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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