Skip to content This internal coolant 8mm drill bit is designed for high-efficiency and high-precision drilling in demanding machining environments. Featuring internal coolant channels and advanced TiXCo3 coating, this 8mm drill bit ensures effective chip evacuation, reduced cutting temperature, and extended tool life, especially in deep-hole drilling operations.
The 8mm drill bit is suitable for a wide range of materials, including carbon steel, alloy steel, stainless steel, and cast iron. The TiXCo3 coating provides excellent wear resistance and oxidation resistance, making this 8mm drill bit for metal ideal for high-speed CNC machining and continuous production.
To support international standards, we offer clear size references for buyers, including 8mm drill bit in inches, 8mm drill bit to fraction, and 8mm drill bit equivalent in imperial, allowing easy conversion for users working with inch or SAE-based systems. Custom lengths, tolerances, and coolant hole designs are also available to match specific machining requirements.
| Order Number | d | l | D | L | HA | HB |
|---|---|---|---|---|---|---|
| HN-3D-CD-0080 | 8 | 41 | D8 | 79 | HA | HB |
| HN-3D-CD-0081 | 8.1 | 47 | D10 | 89 | HA | HB |
| HN-3D-CD-0082 | 8.2 | 47 | D10 | 89 | HA | HB |
| HN-3D-CD-0083 | 8.3 | 47 | D10 | 89 | HA | HB |
| HN-3D-CD-0084 | 8.4 | 47 | D10 | 89 | HA | HB |
| HN-3D-CD-0085 | 8.5 | 47 | D10 | 89 | HA | HB |
| HN-3D-CD-0086 | 8.6 | 47 | D10 | 89 | HA | HB |
| HN-3D-CD-0087 | 8.7 | 47 | D10 | 89 | HA | HB |
| HN-3D-CD-0088 | 8.8 | 47 | D10 | 89 | HA | HB |
| HN-3D-CD-0089 | 8.9 | 47 | D10 | 89 | HA | HB |
| HN-3D-CD-0090 | 9 | 47 | D10 | 89 | HA | HB |
| Order Number | d | l | D | L | HA | HB |
|---|---|---|---|---|---|---|
| HN-5D-CD-0080 | 8 | 53 | D8 | 91 | HA | HB |
| HN-5D-CD-0081 | 8.1 | 61 | D10 | 103 | HA | HB |
| HN-5D-CD-0082 | 8.2 | 61 | D10 | 103 | HA | HB |
| HN-5D-CD-0083 | 8.3 | 61 | D10 | 103 | HA | HB |
| HN-5D-CD-0084 | 8.4 | 61 | D10 | 103 | HA | HB |
| HN-5D-CD-0085 | 8.5 | 61 | D10 | 103 | HA | HB |
| HN-5D-CD-0086 | 8.6 | 61 | D10 | 103 | HA | HB |
| HN-5D-CD-0087 | 8.7 | 61 | D10 | 103 | HA | HB |
| HN-5D-CD-0088 | 8.8 | 61 | D10 | 103 | HA | HB |
| HN-5D-CD-0089 | 8.9 | 61 | D10 | 103 | HA | HB |
| HN-5D-CD-0090 | 9 | 61 | D10 | 103 | HA | HB |
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 |
|---|---|---|---|---|
| TiXCo3 | Advanced nanocomposite multilayer PVD coating based on Ti, Al, Cr and Si; usually built with a TiN or CrTiN adhesion layer, an AlTi(Si)N core and an extremely hard TiSiN nano-composite top layer. Copper-coloured coating designed specifically for hard-machining tools such as solid carbide drills. | Nano-hardness: 42–44 GPa (≈4300–4500 HV). Coefficient of friction: ~0.4 (PoD test, room temperature, 50 % humidity). Coating thickness: typically 1–4 µm. Maximum service temperature up to about 1,000–1,100 °C, giving excellent thermal stability and oxidation resistance for high-speed drilling in hard materials. | Copper appearance; delivers very high surface quality of the hole and extremely high wear resistance. Our hardest nanocomposite coating, optimized for hard machining and finishing operations in drilling, milling and reaming at very high cutting speeds. Suitable for dry or near-dry machining and for difficult-to-cut, abrasive alloys where long, stable tool life is required. | Recommended workpiece materials: hardened steels (up to ~60–64 HRC), stainless steels, tool steels, nickel-based superalloys, cast irons and other hard or abrasive metals. Typical application fields for drills: high-precision deep-hole and high-speed production drilling of dies and moulds, power-train and transmission components, aerospace turbine and structural parts, and other hard-machining operations demanding tight tolerances and excellent hole finish. |
Our 8mm Drill Bit drawings clearly show key 8mm Drill Bit dimensions such as diameter, radius, flute length and overall length. This helps you confirm the right 8mm Drill Bit sizes for your CNC setup and machining depth before ordering.
An 8mm drill bit can be used for a variety of materials depending on its design:
8mm drill bit for metal: steel, stainless steel, aluminum, cast iron
8mm drill bit for wood: hardwood, softwood, plywood
8mm drill bit for concrete: concrete, brick, masonry (requires masonry-specific design)
Choosing the correct drill bit type is essential for performance and tool life.
An 8mm drill bit for metal typically features a sharp cutting edge and optimized flute geometry, while an 8mm drill bit masonry or 8mm drill bit for concrete uses a reinforced carbide tip designed to withstand abrasive materials. Metal drill bits should not be used for concrete drilling.
When selecting an 8mm drill bit, consider:
Material being drilled
Required hole accuracy
Drill bit coating and geometry
Metric vs imperial compatibility
Understanding what size is an 8mm drill bit in inches or standard systems helps ensure proper tool selection.
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 internal coolant 8mm drill bit is engineered for high-performance drilling in steel and difficult-to-machine materials. Equipped with precision internal coolant channels and advanced ALCRONA coating, this 8mm drill bit delivers superior heat resistance, reduced friction, and stable chip evacuation during high-speed and deep-hole drilling.
The ALCRONA coating provides excellent oxidation resistance and hardness at elevated temperatures, making this 8mm drill bit for metal particularly suitable for stainless steel, alloy steel, and high-tensile materials. Internal coolant supply ensures consistent cutting performance, improved hole quality, and extended tool life in CNC machining applications.
Designed for global markets, this 8mm drill bit is offered with clear size references, including 8mm drill bit in inches, 8mm drill bit to fraction, and 8mm drill bit equivalent in imperial, helping users easily convert metric sizes to standard or SAE systems. Custom options for length, tolerance, and coolant configuration are available upon request.
| Order Number | d | l | D | L | HA | HB |
|---|---|---|---|---|---|---|
| HN-3D-CD-0080-A | 8 | 41 | D8 | 79 | HA | HB |
| HN-3D-CD-0081-A | 8.1 | 47 | D10 | 89 | HA | HB |
| HN-3D-CD-0082-A | 8.2 | 47 | D10 | 89 | HA | HB |
| HN-3D-CD-0083-A | 8.3 | 47 | D10 | 89 | HA | HB |
| HN-3D-CD-0084-A | 8.4 | 47 | D10 | 89 | HA | HB |
| HN-3D-CD-0085-A | 8.5 | 47 | D10 | 89 | HA | HB |
| HN-3D-CD-0086-A | 8.6 | 47 | D10 | 89 | HA | HB |
| HN-3D-CD-0087-A | 8.7 | 47 | D10 | 89 | HA | HB |
| HN-3D-CD-0088-A | 8.8 | 47 | D10 | 89 | HA | HB |
| HN-3D-CD-0089-A | 8.9 | 47 | D10 | 89 | HA | HB |
| HN-3D-CD-0090-A | 9 | 47 | D10 | 89 | HA | HB |
| Order Number | d | l | D | L | HA | HB |
|---|---|---|---|---|---|---|
| HN-5D-CD-0080-A | 8 | 53 | D8 | 91 | HA | HB |
| HN-5D-CD-0081-A | 8.1 | 61 | D10 | 103 | HA | HB |
| HN-5D-CD-0082-A | 8.2 | 61 | D10 | 103 | HA | HB |
| HN-5D-CD-0083-A | 8.3 | 61 | D10 | 103 | HA | HB |
| HN-5D-CD-0084-A | 8.4 | 61 | D10 | 103 | HA | HB |
| HN-5D-CD-0085-A | 8.5 | 61 | D10 | 103 | HA | HB |
| HN-5D-CD-0086-A | 8.6 | 61 | D10 | 103 | HA | HB |
| HN-5D-CD-0087-A | 8.7 | 61 | D10 | 103 | HA | HB |
| HN-5D-CD-0088-A | 8.8 | 61 | D10 | 103 | HA | HB |
| HN-5D-CD-0089-A | 8.9 | 61 | D10 | 103 | HA | HB |
| HN-5D-CD-0090-A | 9 | 61 | D10 | 103 | HA | HB |
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 |
|---|---|---|---|---|
| ALCRONA (AlCrN) | Aluminium–chromium nitride (AlCrN) PVD coating, titanium-free; dense, fine-grained structure with high Al/Cr ratio to improve hot hardness and oxidation resistance. Typically deposited as a multi-layer or graded layer on solid carbide or HSS substrates. | Hardness: approx. 2800–3200 HV (nano-indentation). Coefficient of friction: ~0.3–0.35 in dry steel cutting. Heat resistance: stable at elevated temperatures, operating temperature up to about 1,000–1,100 °C with excellent hot hardness and oxidation resistance. High adhesion strength to tool substrate; low tendency to micro-chipping at the cutting edge. | Dark grey to blue-grey appearance. Titanium-free universal high-performance coating for heavy mechanical loads and high cutting speeds. Very high wear resistance under both low-speed / high-load and high-speed / dry-cut conditions. Good performance in dry or minimum-lubrication drilling, maintaining sharp cutting edges and consistent hole quality over long tool life. | Recommended workpiece materials: alloy and carbon steels, pre-hardened and hardened steels, cast irons and high-tensile structural steels. Especially suitable for high-performance carbide or HSS drills used in dry or semi-dry machining. Typical application fields: automotive power-train parts, mould & die holes, general engineering components and high-speed production drilling where long tool life and thermal stability are critical. |
Our 8mm Drill Bit drawings clearly show key 8mm Drill Bit dimensions such as diameter, radius, flute length and overall length. This helps you confirm the right 8mm Drill Bit sizes for your CNC setup and machining depth before ordering.
An 8mm drill bit can be used for a variety of materials depending on its design:
8mm drill bit for metal: steel, stainless steel, aluminum, cast iron
8mm drill bit for wood: hardwood, softwood, plywood
8mm drill bit for concrete: concrete, brick, masonry (requires masonry-specific design)
Choosing the correct drill bit type is essential for performance and tool life.
An 8mm drill bit for metal typically features a sharp cutting edge and optimized flute geometry, while an 8mm drill bit masonry or 8mm drill bit for concrete uses a reinforced carbide tip designed to withstand abrasive materials. Metal drill bits should not be used for concrete drilling.
When selecting an 8mm drill bit, consider:
Material being drilled
Required hole accuracy
Drill bit coating and geometry
Metric vs imperial compatibility
Understanding what size is an 8mm drill bit in inches or standard systems helps ensure proper tool selection.
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 external coolant 8mm drill bit is designed for reliable and efficient drilling in CNC and conventional machining applications. With a high-performance TiXCo3 coating, this 8mm drill bit offers excellent wear resistance, reduced friction, and stable cutting performance when using external coolant supply.
Optimized for steel machining, this 8mm drill bit for metal is suitable for carbon steel, alloy steel, and stainless steel. The TiXCo3 coating improves tool life and hole quality, making the drill bit ideal for shallow to medium-depth drilling under continuous production conditions.
For international compatibility, clear size references are available, including 8mm drill bit in inches, 8mm drill bit to fraction, and 8mm drill bit equivalent in imperial, helping users easily convert metric sizes to standard or SAE systems.
| Order Number | d | l | D | L | HA | HB |
|---|---|---|---|---|---|---|
| HN-3D-TD-0080 | 8 | 41 | 8 | 79 | HA | HB |
| HN-3D-TD-0081 | 8.1 | 47 | 10 | 89 | HA | HB |
| HN-3D-TD-0082 | 8.2 | 47 | 10 | 89 | HA | HB |
| HN-3D-TD-0083 | 8.3 | 47 | 10 | 89 | HA | HB |
| HN-3D-TD-0084 | 8.4 | 47 | 10 | 89 | HA | HB |
| HN-3D-TD-0085 | 8.5 | 47 | 10 | 89 | HA | HB |
| HN-3D-TD-0086 | 8.6 | 47 | 10 | 89 | HA | HB |
| HN-3D-TD-0087 | 8.7 | 47 | 10 | 89 | HA | HB |
| HN-3D-TD-0088 | 8.8 | 47 | 10 | 89 | HA | HB |
| HN-3D-TD-0089 | 8.9 | 47 | 10 | 89 | HA | HB |
| HN-3D-TD-0090 | 9 | 47 | 10 | 89 | HA | HB |
| Order Number | d | l | D | L | HA | HB |
|---|---|---|---|---|---|---|
| HN-5D-TD-0080 | 8 | 53 | 8 | 91 | HA | HB |
| HN-5D-TD-0081 | 8.1 | 61 | 10 | 103 | HA | HB |
| HN-5D-TD-0082 | 8.2 | 61 | 10 | 103 | HA | HB |
| HN-5D-TD-0083 | 8.3 | 61 | 10 | 103 | HA | HB |
| HN-5D-TD-0084 | 8.4 | 61 | 10 | 103 | HA | HB |
| HN-5D-TD-0085 | 8.5 | 61 | 10 | 103 | HA | HB |
| HN-5D-TD-0086 | 8.6 | 61 | 10 | 103 | HA | HB |
| HN-5D-TD-0087 | 8.7 | 61 | 10 | 103 | HA | HB |
| HN-5D-TD-0088 | 8.8 | 61 | 10 | 103 | HA | HB |
| HN-5D-TD-0089 | 8.9 | 61 | 10 | 103 | HA | HB |
| HN-5D-TD-0090 | 9 | 61 | 10 | 103 | HA | HB |
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 |
|---|---|---|---|---|
| TiXCo3 | Advanced nanocomposite multilayer PVD coating based on Ti, Al, Cr and Si; usually built with a TiN or CrTiN adhesion layer, an AlTi(Si)N core and an extremely hard TiSiN nano-composite top layer. Copper-coloured coating designed specifically for hard-machining tools such as solid carbide drills. | Nano-hardness: 42–44 GPa (≈4300–4500 HV). Coefficient of friction: ~0.4 (PoD test, room temperature, 50 % humidity). Coating thickness: typically 1–4 µm. Maximum service temperature up to about 1,000–1,100 °C, giving excellent thermal stability and oxidation resistance for high-speed drilling in hard materials. | Copper appearance; delivers very high surface quality of the hole and extremely high wear resistance. Our hardest nanocomposite coating, optimized for hard machining and finishing operations in drilling, milling and reaming at very high cutting speeds. Suitable for dry or near-dry machining and for difficult-to-cut, abrasive alloys where long, stable tool life is required. | Recommended workpiece materials: hardened steels (up to ~60–64 HRC), stainless steels, tool steels, nickel-based superalloys, cast irons and other hard or abrasive metals. Typical application fields for drills: high-precision deep-hole and high-speed production drilling of dies and moulds, power-train and transmission components, aerospace turbine and structural parts, and other hard-machining operations demanding tight tolerances and excellent hole finish. |
Our 8mm Drill Bit drawings clearly show key 8mm Drill Bit dimensions such as diameter, radius, flute length and overall length. This helps you confirm the right 8mm Drill Bit sizes for your CNC setup and machining depth before ordering.
An 8mm drill bit can be used for a variety of materials depending on its design:
8mm drill bit for metal: steel, stainless steel, aluminum, cast iron
8mm drill bit for wood: hardwood, softwood, plywood
8mm drill bit for concrete: concrete, brick, masonry (requires masonry-specific design)
Choosing the correct drill bit type is essential for performance and tool life.
An 8mm drill bit for metal typically features a sharp cutting edge and optimized flute geometry, while an 8mm drill bit masonry or 8mm drill bit for concrete uses a reinforced carbide tip designed to withstand abrasive materials. Metal drill bits should not be used for concrete drilling.
When selecting an 8mm drill bit, consider:
Material being drilled
Required hole accuracy
Drill bit coating and geometry
Metric vs imperial compatibility
Understanding what size is an 8mm drill bit in inches or standard systems helps ensure proper tool selection.
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 external coolant 8mm drill bit is designed for stable and efficient drilling in CNC and conventional machining environments where external coolant supply is used. Featuring advanced ALCRONA coating, this 8mm drill bit delivers excellent heat resistance, low friction, and consistent cutting performance.
The ALCRONA coating provides high hardness and oxidation resistance at elevated temperatures, making this 8mm drill bit for metal ideal for machining stainless steel, alloy steel, and high-strength materials. External coolant delivery ensures smooth chip evacuation and reliable hole quality in shallow to medium-depth drilling applications.
To meet international standards, this 8mm drill bit is supplied with clear size references, including 8mm drill bit in inches, 8mm drill bit to fraction, and 8mm drill bit equivalent in imperial, allowing easy conversion between metric and imperial systems.
| Order Number | d | l | D | L | HA | HB |
|---|---|---|---|---|---|---|
| HN-3D-TD-0080-A | 8 | 41 | 8 | 79 | HA | HB |
| HN-3D-TD-0081-A | 8.1 | 47 | 10 | 89 | HA | HB |
| HN-3D-TD-0082-A | 8.2 | 47 | 10 | 89 | HA | HB |
| HN-3D-TD-0083-A | 8.3 | 47 | 10 | 89 | HA | HB |
| HN-3D-TD-0084-A | 8.4 | 47 | 10 | 89 | HA | HB |
| HN-3D-TD-0085-A | 8.5 | 47 | 10 | 89 | HA | HB |
| HN-3D-TD-0086-A | 8.6 | 47 | 10 | 89 | HA | HB |
| HN-3D-TD-0087-A | 8.7 | 47 | 10 | 89 | HA | HB |
| HN-3D-TD-0088-A | 8.8 | 47 | 10 | 89 | HA | HB |
| HN-3D-TD-0089-A | 8.9 | 47 | 10 | 89 | HA | HB |
| HN-3D-TD-0090-A | 9 | 47 | 10 | 89 | HA | HB |
| Order Number | d | l | D | L | HA | HB |
|---|---|---|---|---|---|---|
| HN-5D-TD-0080-A | 8 | 53 | 8 | 91 | HA | HB |
| HN-5D-TD-0081-A | 8.1 | 61 | 10 | 103 | HA | HB |
| HN-5D-TD-0082-A | 8.2 | 61 | 10 | 103 | HA | HB |
| HN-5D-TD-0083-A | 8.3 | 61 | 10 | 103 | HA | HB |
| HN-5D-TD-0084-A | 8.4 | 61 | 10 | 103 | HA | HB |
| HN-5D-TD-0085-A | 8.5 | 61 | 10 | 103 | HA | HB |
| HN-5D-TD-0086-A | 8.6 | 61 | 10 | 103 | HA | HB |
| HN-5D-TD-0087-A | 8.7 | 61 | 10 | 103 | HA | HB |
| HN-5D-TD-0088-A | 8.8 | 61 | 10 | 103 | HA | HB |
| HN-5D-TD-0089-A | 8.9 | 61 | 10 | 103 | HA | HB |
| HN-5D-TD-0090-A | 9 | 61 | 10 | 103 | HA | HB |
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 |
|---|---|---|---|---|
| ALCRONA (AlCrN) | Aluminium–chromium nitride (AlCrN) PVD coating, titanium-free; dense, fine-grained structure with high Al/Cr ratio to improve hot hardness and oxidation resistance. Typically deposited as a multi-layer or graded layer on solid carbide or HSS substrates. | Hardness: approx. 2800–3200 HV (nano-indentation). Coefficient of friction: ~0.3–0.35 in dry steel cutting. Heat resistance: stable at elevated temperatures, operating temperature up to about 1,000–1,100 °C with excellent hot hardness and oxidation resistance. High adhesion strength to tool substrate; low tendency to micro-chipping at the cutting edge. | Dark grey to blue-grey appearance. Titanium-free universal high-performance coating for heavy mechanical loads and high cutting speeds. Very high wear resistance under both low-speed / high-load and high-speed / dry-cut conditions. Good performance in dry or minimum-lubrication drilling, maintaining sharp cutting edges and consistent hole quality over long tool life. | Recommended workpiece materials: alloy and carbon steels, pre-hardened and hardened steels, cast irons and high-tensile structural steels. Especially suitable for high-performance carbide or HSS drills used in dry or semi-dry machining. Typical application fields: automotive power-train parts, mould & die holes, general engineering components and high-speed production drilling where long tool life and thermal stability are critical. |
Our 8mm Drill Bit drawings clearly show key 8mm Drill Bit dimensions such as diameter, radius, flute length and overall length. This helps you confirm the right 8mm Drill Bit sizes for your CNC setup and machining depth before ordering.
An 8mm drill bit can be used for a variety of materials depending on its design:
8mm drill bit for metal: steel, stainless steel, aluminum, cast iron
8mm drill bit for wood: hardwood, softwood, plywood
8mm drill bit for concrete: concrete, brick, masonry (requires masonry-specific design)
Choosing the correct drill bit type is essential for performance and tool life.
An 8mm drill bit for metal typically features a sharp cutting edge and optimized flute geometry, while an 8mm drill bit masonry or 8mm drill bit for concrete uses a reinforced carbide tip designed to withstand abrasive materials. Metal drill bits should not be used for concrete drilling.
When selecting an 8mm drill bit, consider:
Material being drilled
Required hole accuracy
Drill bit coating and geometry
Metric vs imperial compatibility
Understanding what size is an 8mm drill bit in inches or standard systems helps ensure proper tool selection.
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 8mm drill bit is widely used across CNC machining, metal fabrication, construction, and general industrial drilling applications. Whether drilling carbon steel, stainless steel, aluminum, or concrete, the 8mm drill bit provides a balanced combination of hole accuracy and cutting stability.
With multiple configurations available, including 8mm drill bit for metal, 8mm drill bit for wood, and 8mm drill bit for concrete, this size is suitable for both production environments and workshop use. For international users, clear references such as 8mm drill bit in inches, 8mm drill bit to fraction, and 8mm drill bit equivalent in imperial help ensure correct tool selection across metric and standard systems.
Each 8mm drill bit is manufactured using high-quality carbide substrate and advanced coating technologies to ensure excellent wear resistance and long service life. Optimized cutting geometry improves chip evacuation and reduces cutting forces, resulting in clean holes and consistent performance even under high-speed drilling conditions.
Designed to meet demanding machining requirements, this 8mm drill bit for metal delivers stable performance in steel and hard materials while maintaining precise hole size and surface finish. Available options also support 8mm drill bit size conversion, including standard and imperial equivalents, making the 8mm drill bit a reliable choice for global CNC and industrial users.
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 8mm 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 8mm Drill Bit.
Each of your tungsten 8mm Drill Bit will be sandblasted to effectively remove burrs and improve the finish.
All HNCarbide’s 8mm 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 8mm 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.
An 8mm drill bit can be used for a variety of materials depending on its design:
8mm drill bit for metal: steel, stainless steel, aluminum, cast iron
8mm drill bit for wood: hardwood, softwood, plywood
8mm drill bit for concrete: concrete, brick, masonry (requires masonry-specific design)
Choosing the correct drill bit type is essential for performance and tool life.
An 8mm drill bit for metal typically features a sharp cutting edge and optimized flute geometry, while an 8mm drill bit masonry or 8mm drill bit for concrete uses a reinforced carbide tip designed to withstand abrasive materials. Metal drill bits should not be used for concrete drilling.
When selecting an 8mm drill bit, consider:
Material being drilled
Required hole accuracy
Drill bit coating and geometry
Metric vs imperial compatibility
Understanding what size is an 8mm drill bit in inches or standard systems helps ensure proper tool selection.
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.
An 8mm drill bit is one of the most commonly used metric drill sizes in both industrial machining and general drilling applications. Whether you are working with metal, wood, or concrete, understanding the 8mm drill bit size, its conversions, and proper use can help you achieve better drilling accuracy, longer tool life, and improved productivity.
This guide covers everything you need to know, including what size is an 8mm drill bit, 8mm drill bit in inches, material applications, and how it compares to imperial and fractional drill sizes.
An 8mm drill bit is a metric drill bit with a nominal diameter of 8 millimeters. It is widely used in CNC machining, fabrication workshops, construction, and maintenance work due to its balanced size—large enough for structural holes while still offering good control and precision.
Many users often ask what is an 8mm drill bit or what size is an 8mm drill bit, especially when working with machines or tooling systems based on imperial standards. Understanding size conversion is essential when selecting the correct drill bit for your application.
One of the most common questions is:
What is an 8mm drill bit in inches?
8mm drill bit in inches = 0.31496 inches
Since imperial drill bits are usually available in fractional or numbered sizes, there is no exact inch equivalent. The closest to 8mm drill bit in imperial sizing is:
5/16 inch drill bit = 0.3125 inches
This makes the 8mm drill bit equivalent in inches slightly larger than 5/16". For precision work, using the correct metric drill is always recommended.
Many buyers search for 8mm drill bit to fraction or 8mm drill bit fractional equivalent. Here is a quick reference:
8mm drill bit to inches fraction ≈ 5/16"
8mm drill bit in fraction: No exact match
8mm drill bit to imperial: Closest is 5/16"
Because the difference matters in tight-tolerance applications, understanding 8mm drill bit conversion to fraction is especially important for CNC machining and metalworking.
An 8mm drill bit for metal is commonly used for drilling steel, stainless steel, alloy steel, and aluminum. Carbide or coated drill bits are preferred for high-speed machining and long tool life.
Typical uses include:
CNC machining centers
Fabrication and structural components
Automotive and aerospace parts
For metal applications, proper geometry and coatings significantly improve performance.
An 8mm drill bit for wood is often used in carpentry, furniture manufacturing, and installation work. While wood is softer than metal, a sharp cutting edge ensures clean holes and prevents tear-out.
Woodworking applications usually do not require coatings, but precision still matters when fitting dowels or fasteners.
An 8mm drill bit for concrete or 8mm drill bit masonry is designed with a reinforced tip, often carbide-tipped, to handle abrasive materials such as concrete, brick, and stone.
These drill bits are commonly used in:
Construction projects
Anchoring and fastening systems
Electrical and plumbing installations
Using a standard metal drill bit on concrete is not recommended.
The 8mm drill bit in standard systems is part of the ISO metric drill size range, making it widely accepted across Europe and Asia. However, users in the US often search for 8mm drill bit to US or 8mm drill bit to standard size.
Metric drill bits are increasingly used worldwide, especially in CNC machining, even in regions where imperial sizing was traditionally dominant.
For industrial machining, 8mm drill bit size selection often goes beyond diameter. Coolant delivery plays a critical role:
Internal coolant 8mm drill bit: Ideal for deep holes and high-speed machining
External coolant 8mm drill bit: Suitable for shallow to medium-depth drilling
Choosing the right configuration improves chip evacuation and tool life.
When selecting an 8mm drill bit, consider the following factors:
Material to be drilled (metal, wood, concrete)
Required hole tolerance
Machine type (CNC or manual)
Metric vs imperial system compatibility
Understanding what size is an 8mm drill bit in standard or imperial systems helps avoid costly mistakes.
The 8mm drill bit is a versatile and widely used tool across multiple industries. From understanding 8mm drill bit in inches and 8mm drill bit to fraction, to selecting the right drill bit for metal, wood, or concrete, proper knowledge ensures better drilling results and longer tool life.
Whether you are working in CNC machining, fabrication, or construction, choosing the correct 8mm drill bit size and standard is essential for accuracy, efficiency, and 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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