Skip to content This 27 64 drill bit features an advanced AlCrN coating and precision-engineered coolant holes, designed for stable and efficient drilling in steel, stainless steel, and other demanding metal materials. The AlCrN coating provides excellent heat resistance and wear protection, allowing the drill bit to maintain cutting performance at higher speeds and longer tool life.
With accurately controlled diameter, this 27 64 drill bit offers reliable size consistency, making it suitable for applications where exact hole tolerance is required. The internal coolant holes deliver cutting fluid directly to the cutting edges, improving chip evacuation, reducing heat buildup, and enhancing surface finish during deep or continuous drilling operations.
The 27 64 drill bit is available in inch standard with clearly defined size in mm, metric equivalent, and closest drill bit size for easy selection and replacement. Optional shank configurations, including 3/8 shank designs, are supported to match different machine setups. Customized geometries, coatings, and lengths can also be provided to meet specific production requirements.
3D
EDP No. | Fractional | Metric (D1, mm) | Flute Length L1 (mm) | Shank Diameter D2 (mm) | Overall Length L2 (mm) |
DB310027 | 27/64 | 10.72 | 55 | 12 | 102 |
5D
EDP No. | Fractional | Metric (D1, mm) | Flute Length L1 (mm) | Shank Diameter D2 (mm) | Overall Length L2 (mm) |
DB510027 | 27/64 | 10.72 | 71 | 12 | 118 |
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 27 64 Drill Bit drawings clearly show key 27 64 Drill Bit dimensions such as diameter, radius, flute length and overall length. This helps you confirm the right 27 64 Drill Bit sizes for your CNC setup and machining depth before ordering.
A 27 64 drill bit can be used on a wide range of materials, including:
Carbon steel
Stainless steel
Aluminum
Alloy steels
Tool material and coating selection should be matched to the workpiece material for best performance.
With coolant holes: Recommended for deep-hole drilling, high-speed machining, and improved chip evacuation.
Without coolant holes: Suitable for external coolant or dry drilling setups and simpler machine configurations.
The choice depends on your machine capability and drilling conditions.
Coated versions of the 27 64 drill bit, such as AlCrN-coated tools, offer improved heat resistance, reduced wear, and longer tool life compared to uncoated drill bits. Uncoated tools may be suitable for lower-speed or less demanding applications.
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.
This 27 64 drill bit is engineered with a durable AlCrN coating and a solid carbide structure, making it suitable for stable and precise drilling in steel, stainless steel, and alloy materials. The AlCrN coating offers excellent resistance to heat and wear, helping extend tool life and maintain consistent cutting performance in high-speed drilling applications.
Designed without coolant holes, this 27 64 drill bit is ideal for machines or setups that rely on external coolant or dry machining processes. The rigid tool body ensures reliable chip control and dimensional accuracy, even under demanding cutting conditions.
The 27 64 drill bit is manufactured to inch standards with clearly defined size in mm, metric equivalent, and closest drill bit size for easy comparison and selection. Optional shank configurations, including 3/8 shank options, are available to match different machine requirements. Custom geometries, coatings, and lengths can also be provided for specific drilling needs.
3D
EDP No. | Fractional | Metric (D1, mm) | Flute Length L1 (mm) | Shank Diameter D2 (mm) | Overall Length L2 (mm) |
DB301027 | 27/64 | 10.72 | 55 | 12 | 102 |
5D
EDP No. | Fractional | Metric (D1, mm) | Flute Length L1 (mm) | Shank Diameter D2 (mm) | Overall Length L2 (mm) |
DB501027 | 27/64 | 10.72 | 71 | 12 | 118 |
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 27 64 Drill Bit drawings clearly show key 27 64 Drill Bit dimensions such as diameter, radius, flute length and overall length. This helps you confirm the right 27 64 Drill Bit sizes for your CNC setup and machining depth before ordering.
A 27 64 drill bit can be used on a wide range of materials, including:
Carbon steel
Stainless steel
Aluminum
Alloy steels
Tool material and coating selection should be matched to the workpiece material for best performance.
With coolant holes: Recommended for deep-hole drilling, high-speed machining, and improved chip evacuation.
Without coolant holes: Suitable for external coolant or dry drilling setups and simpler machine configurations.
The choice depends on your machine capability and drilling conditions.
Coated versions of the 27 64 drill bit, such as AlCrN-coated tools, offer improved heat resistance, reduced wear, and longer tool life compared to uncoated drill bits. Uncoated tools may be suitable for lower-speed or less demanding applications.
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 27 64 drill bit is widely used in precision drilling applications across steel, stainless steel, aluminum, and alloy materials. Its inch-standard size makes it especially suitable for workshops and production lines that require accurate hole dimensions and consistent repeatability.
This 27 64 drill bit is commonly applied in general machining, mold and die manufacturing, equipment maintenance, and custom metal fabrication. With clearly defined size in mm, metric equivalent, and closest drill bit size, it allows operators to easily match tooling requirements and reduce selection errors. Whether used for prototype work or batch production, the 27 64 drill bit delivers reliable results across a broad range of drilling tasks.
Each 27 64 drill bit is manufactured with strict diameter control and optimized cutting geometry to ensure stable drilling performance and long tool life. The solid carbide structure provides excellent rigidity, helping maintain hole accuracy even at higher cutting speeds and feed rates.
Designed to meet both inch and metric comparison standards, this 27 64 drill bit offers predictable performance when replacing or comparing with closest metric sizes. Optional shank configurations, including 3/8 shank designs, are available to suit different machine setups. Consistent quality from batch to batch makes the 27 64 drill bit a dependable choice for professional machining operations.
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 27 64 Drill BitV 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 27 64 Drill Bit.
Each of your tungsten 27 64 Drill Bit will be sandblasted to effectively remove burrs and improve the finish.
All HNCarbide’s 27 64 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 27 64 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 27 64 drill bit can be used on a wide range of materials, including:
Carbon steel
Stainless steel
Aluminum
Alloy steels
Tool material and coating selection should be matched to the workpiece material for best performance.
With coolant holes: Recommended for deep-hole drilling, high-speed machining, and improved chip evacuation.
Without coolant holes: Suitable for external coolant or dry drilling setups and simpler machine configurations.
The choice depends on your machine capability and drilling conditions.
Coated versions of the 27 64 drill bit, such as AlCrN-coated tools, offer improved heat resistance, reduced wear, and longer tool life compared to uncoated drill bits. Uncoated tools may be suitable for lower-speed or less demanding applications.
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.
When working with inch-based drilling systems, selecting the correct drill bit size is critical for accuracy and performance. The 27 64 drill bit is a commonly used fractional size that often raises questions about metric conversion, closest equivalent sizes, and practical applications. This guide explains everything you need to know about the 27 64 drill bit, helping machinists, engineers, and buyers make confident decisions.
A 27 64 drill bit refers to a fractional inch drill bit size used primarily in the imperial measurement system. It is widely applied in metalworking, general machining, maintenance, and fabrication environments where inch standards are required.
Because many workshops also work with metric tooling, users frequently search for the 27 64 drill bit in mm, its metric equivalent, or the closest metric size. Understanding these conversions is essential to maintaining hole accuracy and avoiding tolerance issues.
One of the most common questions is how to convert a 27 64 drill bit to mm or decimal format.
27/64 inch = 0.4219 inches
27/64 inch ≈ 10.72 mm
This means the 27 64 drill bit in metric is approximately 10.72 mm, which does not correspond exactly to a standard metric drill size. Because of this, users often look for the 27 64 drill bit closest size when substituting metric tooling.
The most frequently used 27 64 drill bit equivalent in metric systems is:
10.7 mm drill bit (closest standard metric size)
In precision machining, even small size differences matter. A 10.5 mm drill bit may produce undersized holes, while an 11 mm drill bit can exceed tolerance. For applications requiring tight dimensional control, using the exact 27 64 drill bit is often recommended rather than substituting a metric alternative.
Many machinists rely on a 27 64 drill bit chart to compare fractional, decimal, and metric sizes. These charts are especially useful when:
Replacing worn drill bits
Matching hole sizes across inch and metric systems
Selecting the closest size during tooling shortages
A standard drill bit chart clearly shows the decimal value, metric approximation, and relative size difference, helping reduce selection errors and rework.
The 27 64 drill bit is commonly used in applications such as:
Steel and stainless steel drilling
Aluminum and alloy machining
Equipment maintenance and repair
Mold and die work
General CNC and manual machining
Because it sits between common metric sizes, this drill bit is frequently specified on engineering drawings that follow inch standards.
Another important consideration is shank configuration. Many users search for a 27 64 drill bit 3/8 shank, especially when machine tool holders have fixed chuck or collet sizes.
A 3/8 shank provides:
Better clamping stability
Improved torque transmission
Reduced slippage during drilling
This option is especially useful in CNC machines and high-load drilling operations.
Searches like 27 64 drill bit near me or 27 64 drill bit nearby often lead users to general hardware retailers. While stores such as Home Depot, Lowe’s, Harbor Freight, or NAPA may carry fractional drill bits, availability, quality, and consistency can vary.
For professional or production use, machinists often prefer sourcing directly from specialized manufacturers or industrial suppliers to ensure:
Accurate diameter control
Consistent material quality
Longer tool life
Custom options such as coatings or length variations
This is particularly important when replacing or matching an existing 27 64 drill bit in a production environment.
When selecting a 27 64 drill bit, consider the following factors:
Material to be drilled (steel, stainless steel, aluminum, alloy)
Hole depth and tolerance requirements
Coolant method (external coolant, dry drilling, or internal coolant)
Machine type and shank compatibility
For high-speed or high-temperature applications, coated carbide drill bits often provide better performance and longer service life compared to standard HSS tools.
The 27 64 drill bit plays an important role in inch-based machining systems, especially when accuracy and consistency are critical. Understanding its size in mm, decimal conversion, closest metric equivalent, and practical applications allows users to select the right tool with confidence.
Whether you are matching an engineering drawing, replacing a worn tool, or comparing sizes using a drill bit chart, choosing the correct 27 64 drill bit helps ensure reliable drilling results and improved production efficiency.
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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