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DTH Drill Bits
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At Eazydrill, we focus on the design, manufacture, and supply of high-quality DTH (Down-The-Hole) drill bits. Produced in our well-equipped facilities in China, our products are tailored to perform effectively in a variety of drilling conditions. Whether you’re drilling through hard rock formations in mining, quarrying, or constructing deep foundations, Eazydrill provides reliable solutions that can be customized to meet your specific requirements.
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Whether you need help choosing the right DTH drill bit or have a specific project in mind, our team is here to assist. Submit your inquiry now, and we’ll respond promptly with a tailored quote just for you.
2025 DTH Drill Bits Comprehensive Purchase Guide
Bit Design
Face Designs
| Face Design | Characteristics | Advantages | Application Areas |
|---|---|---|---|
| Convex Face | Bulged surface that focuses percussive force towards the center. | Enhances penetration rate; stabilizes the bit to reduce deviation. | Medium-hard to hard rock formations like granite and basalt; suitable for quarry drilling and deep foundations. |
| Concave Face | Recessed surface focusing shock wave and flushing to the center. | Provides excellent control over hole direction; ensures fast penetration rates and efficient clearing of cuttings. | Soft to medium formations; ideal for water well drilling and geological explorations where straight holes are critical. |
| Flat Face | Smooth, flat surface that distributes impact energy evenly. | Minimizes bit sticking; handles rock fissures well; resistant to gauge wearing. | Very hard or abrasive rock formations like quartzite and volcanic rock; used in construction for high precision drilling. |
| Drop Center Face | Lowered center area with raised buttons around the edge. | Focuses force at the center, enhancing penetration rate and stability; efficient debris removal. | Medium to hard rock conditions; used in mining and for utility holes where speed and straightness are crucial. |
| Double Gauge Face | Features an extra row of gauge buttons for additional bit body protection and improved hole alignment. | Enhances bit durability and stability; maintains hole diameter in variable conditions. | Uneven and highly abrasive formations; suitable for large-scale drilling projects like oil and gas exploration. |
Bit Design
Button Configuration
Button Types
| Button Type | Characteristics | Advantages | Applications |
|---|---|---|---|
| Domed/Round Button | Large surface area, durable profile | Excellent wear resistance, suited for various rock types | Ideal for hard and abrasive rock formations |
| Parabolic/Semi-Ballistic Button | Shape between round and ballistic | Balances penetration and wear resistance | Effective in medium-hard to hard rock |
| Ballistic Button | Pointed, bullet-shaped tip | High penetration rate, faster drilling | Best used in soft to medium-hard, non-abrasive rock |
| Sharp Button | Sharp, chisel-like edge | Enables precision cutting through hard rock | Suited for extremely hard and compact rocks |
| Flat Button | Flat surface with minimal protrusion over the bit face | Offers stability, less prone to breakage, spreads impact | Recommended for extremely abrasive conditions |
Impact of Button Configuration on Drilling Performance
Ballistic buttons generally increase penetration rate but may wear faster in hard, abrasive conditions. Spherical buttons are slower but more durable.
The arrangement and type of buttons influence how effectively a bit can fracture the rock. Dense patterns are better for hard, compact rocks, while sparse patterns excel in softer materials.
Detailed Disassembly
Full Face Exposure
Partial Face Exposure
Dense Patterns
Sparse Patterns
Outer Rows
Inner Rows
Bit Design
Flush Hole Diameter
Impact of Flush Hole Diameter
Larger diameters allow for a faster and more voluminous flow of drilling fluid, which can remove cuttings more efficiently, especially in faster drilling operations or when drilling deeper holes.
The size determines the velocity and pressure of the drilling fluid exiting the bit, which in turn affects the lifting capacity of the fluid to carry cuttings to the surface.
Larger flush holes can facilitate better cooling of the bit by allowing more fluid to pass through, which is critical in high-friction drilling scenarios.
General Guidelines for Flush Hole Diameters
| Drilling Condition | Typical Diameter Range | Considerations |
|---|---|---|
| Soft Rock Drilling | 6mm to 10mm | Smaller diameters often suffice as debris is easier to evacuate and doesn't require high fluid velocity. |
| Hard Rock Drilling | 10mm to 15mm | Larger diameters are beneficial for handling the larger, more abrasive debris typical in hard rock drilling. They facilitate better debris flow and prevent clogging. |
| Deep Hole Drilling | 10mm to 15mm or more | Deeper holes require larger diameters to ensure the cuttings can be effectively lifted out of the borehole, especially as hydrostatic pressure increases with depth. |
Factors Affecting Diameter Selection
Drilling Fluid Type
- Water-Based Fluids: Smaller diameters can be effective due to water's lower viscosity.
- Oil-Based Fluids: Larger diameters might be necessary to overcome the higher viscosity and ensure adequate cutting removal.
Drilling Speed
- High-Speed Drilling: Larger diameters help to remove cuttings quickly and maintain high drilling speeds by preventing bit overload.
- Low-Speed Drilling: Smaller diameters may be sufficient, especially if the rate of debris production is lower.
Material Composition
Steel Quality
Key Factors in Steel Selection
- Toughness: The ability of the steel to absorb energy and deform without fracturing. Higher toughness is essential in unpredictable or varied rock conditions to prevent premature failure.
- Hardness: A measure of the steel’s resistance to surface deformation. Harder steels can resist wear better, especially important in abrasive rock conditions.
- Strength: The maximum stress the steel can withstand while being stretched or pulled before breaking. High strength is crucial to withstand the intense stresses of drilling.
- Fatigue Resistance: The ability to withstand the cyclic load of drilling, where the bit experiences repeated stress from rotational and percussive forces.
Common Steel Grades Used in DTH Drill Bits
This is a low-alloy steel that contains chromium, molybdenum, and manganese. It is well-known for its outstanding toughness, good ductility, and excellent resistance to abrasion. Its hardness can be increased through heat treatment, making it suitable for moderate to tough drilling conditions.
An alloy steel known for high strength, toughness, and resistance to wear and fatigue. It contains nickel, chromium, and molybdenum, which give it the ability to perform well in high-stress applications. It is often used in oil and gas exploration where deep drilling into hard rock formations is required.
A high-carbon chromium steel that offers high hardness and excellent wear resistance, making it ideal for drill bits used in very abrasive environments. However, it is generally less tough than 4140 and 4340, making it more susceptible to cracking under severe impact.
A tungsten-based high-speed steel with high hardness at high temperatures and excellent wear resistance. It is used for drill bits that need to maintain sharpness and resist softening under high drilling temperatures.
Heat Treatment Processes
Heat treatment involves the controlled heating and cooling of metals to alter their physical and mechanical properties without changing the product shape. For DTH drill bits, heat treatment is designed to improve hardness, toughness, and resistance to wear and fatigue, making the bits suitable for the harsh conditions encountered during drilling.
| Heat Treatment Process | Process Description | Purpose | Benefits for DTH Bits |
|---|---|---|---|
| Annealing | Slowly heating the steel to a high temperature and then cooling it slowly, usually in a furnace. | Reduces hardness, increases ductility, and relieves internal stresses. | Prepares the steel for further shaping and machining, making it less likely to crack or distort. |
| Normalizing | Heating the steel to a temperature slightly above its critical point and then allowing it to air cool. | Refines the grain structure, enhancing mechanical properties and making them more uniform. | Provides a consistent material for further processing; enhances strength and toughness of the steel. |
| Quenching and Tempering | Heating the steel to a high temperature and then rapidly cooling (quenching); followed by reheating at a lower temperature (tempering). | Increases hardness and strength of the steel; tempering adjusts hardness and ductility. | Produces bits that are extremely hard yet maintain some ductility to absorb impacts during drilling. |
| Case Hardening | Techniques like carburizing, nitriding, and carbonitriding enrich the surface with carbon or nitrogen, followed by quenching. | Produces a hard, wear-resistant surface layer while keeping the underlying material tough. | Enhances surface hardness to resist wear, extending the life of bits in abrasive conditions. |
| Induction Hardening | Using induction coils to heat the steel rapidly with eddy currents and then quenching it almost immediately. | Selectively hardens specific areas of the bit that are more prone to wear. | Allows precise control over the hardness and depth of the hardened layer, focusing on enhancing durability of areas requiring high wear resistance. |
Material Composition
Carbide Inserts
Types of Tungsten Carbide
| Type of Tungsten Carbide | Characteristics | Applications | Advantages |
|---|---|---|---|
| Fine-Grained Tungsten Carbide | Smaller grain size results in higher hardness and better wear resistance. | Suitable for abrasive rock formations where wear resistance is critical. | Provides a sharper edge for improved penetration rates and maintains form longer under abrasive conditions. |
| Medium-Grained Tungsten Carbide | Offers a balance between hardness and impact resistance. | Ideal for varied rock conditions, where both abrasion resistance and impact strength are needed. | Ensures reliable performance across a spectrum of rock types, from medium-hard to hard formations. |
| Coarse-Grained Tungsten Carbide | Lower hardness but increased toughness and impact resistance. | Best used in impact drilling situations and hard, non-abrasive rock where toughness is more important than wear resistance. | Reduces the likelihood of fracture under high impact and stress. |
Impact of Carbide Quality on Drill Bit Performance
Wear Resistance
Higher quality, finer-grained carbide maintains its form longer, allowing for more extended periods of drilling without the need for bit replacement or sharpening.
Penetration Efficiency
Sharper, harder carbide can achieve higher penetration rates, which can significantly reduce drilling time and associated costs.
Overall Durability
The right carbide selection will lead to fewer bit failures and less downtime, improving the efficiency and cost-effectiveness of drilling operations.
Size and Dimensions
Diameter Range
Range
Typically from 2 inches (51 mm) to 4 inches (102 mm)
Applications
Used for shallow hole drilling, utility work, and in applications where precision and maneuverability are required.
Range
Commonly from 5 inches (127 mm) to 8 inches (203 mm)
Applications
Ideal for general drilling purposes such as water well drilling, blast hole drilling in mining, and medium-depth geotechnical applications.
Range
Ranging from 9 inches (229 mm) to 12 inches (305 mm) or larger
Applications
Used for deep hole drilling, large-scale mining operations, and for drilling large diameter holes in construction and oil and gas extraction.
Selection Criteria Based on Diameter
Project Specifications
Drilling Equipment Compatibility
Material Being Drilled
Depth of Drill
Customization Options
Many manufacturers offer custom diameters beyond standard sizes to meet specific drilling needs. Custom-sized bits can be designed to maximize drilling efficiency and bit life based on unique project requirements and geological conditions.
Shank Types
Shank Profiles
Common Shank Profiles
| Shank Profile | Design Features | Compatibility |
|---|---|---|
| DHD Shank | Robust, suitable for a broad range of drilling applications. | Fits the most common DTH hammers, offering versatility across different drilling equipment. |
| QL Shank | Excellent air flushing capability, enhancing drilling speed. | Compatible with high-performance hammers, often used in mining and quarrying. |
| SD Shank | Durable and strong, capable of handling high-impact conditions. | Works with hammers designed for deep hole drilling and hard rock environments. |
| Mission Shank | Balances air flushing and wear resistance. | Suitable for a wide range of industrial hammers, commonly used in construction and oil and gas drilling. |
| BR Shank | Smaller and lighter, designed for compact and mobile rigs. | Typically used with lightweight, portable hammers for construction and utility applications. |
| Cop Shank | Optimized for high-frequency impact and precision. | Best suited for advanced hammers used in precise drilling applications, such as geotechnical drilling. |
How to Select the Right Shank Profile?
Choosing the appropriate shank profile for a DTH drill bit involves several considerations
The shank must match the specific hammer used, as each hammer model is designed to fit certain shank profiles for optimal performance.
The choice of shank profile should align with the drilling objectives, such as depth, speed, and the type of material being drilled.
nvironmental factors, such as temperature and ground conditions, can influence the selection of a shank, as some are better suited to extreme conditions than others.
Compatibility and Usage
System Compatibility
Factors Influencing System Compatibility
The interface between the drill bit and the hammer is pivotal. It must ensure a tight and secure fit to effectively transmit the percussive energy required to break the rock.
The shank of the drill bit must match the chuck of the hammer. This match is crucial to avoid energy loss and to prevent damage to both the bit and the hammer.
DTH systems use compressed air for hammer operation and cuttings removal. The drill bit design must align with the hammer’s air flow specifications to optimize the clearing of debris and cooling of the bit during operations.
What Are Common Drilling Systems and Their Compatibility Requirements?
These systems are the most common and require drill bits that match standard shank profiles (e.g., DHD, SD, QL). These bits must be designed to handle the specific air pressure and volume requirements of the hammers used in these systems.
RC systems, used for sample collection, require drill bits that can work with dual-wall drill pipes and specialized RC hammers. The bits should be designed to prevent contamination of the samples and to ensure efficient return of cuttings.
These systems typically use larger bits and require hammers that can generate higher levels of percussive energy. Compatibility here focuses on maximizing the rate of penetration and ensuring the integrity of the wellbore.
How to Ensure Compatibility?
Always refer to the manufacturer's specifications for both the hammers and the bits to ensure compatibility. This includes checking the size, shank type, and operational specifications.
Many manufacturers offer custom-designed bits that are tailored to fit specific hammers or drilling systems. This customization can address unique operational challenges and optimize drilling performance.
Whenever possible, conducting field tests with the bit and hammer combination can provide practical insights into the system’s performance and highlight any potential compatibility issues before full-scale operations begin.
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Feel Free to Reach Out for Further Details.
Feel free to drop us a message using the form below, or if you prefer, give us a call or send us an email. We’re available to support you from Monday to Friday, 9 AM to 5 PM (your timezone).
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Compatibility and Usage
Optimal Applications
Their ability to handle hard rock types and efficient removal of drilling cuttings make them perfect for creating the deep and wide holes necessary for blasting operations.
Used in the construction of buildings, bridges, and other infrastructure, DTH bits drill large diameter holes for piles and foundation supports.
Efficient in extracting large blocks of stone by drilling holes along predefined cutting lines.
Essential for drilling deep wells to access groundwater, DTH bits handle various soil and rock conditions encountered during well construction.
Used to drill deep holes into geothermal reservoirs for the installation of geothermal energy systems.
DTH bits are used in the initial drilling stages to reach and sample underground reservoirs in oil and gas exploration.
Specialized DTH bits are used for environmental sampling and geotechnical testing to ensure minimal contamination and precise sample integrity.
In road construction and maintenance, DTH drill bits are used for creating anchor holes for stabilizations and controlled blasting for new roadways.
For unique applications or specific project requirements, custom DTH bits can be designed to offer optimal performance tailored to unique geological conditions and operational challenges.
Performance Characteristics
Penetration Rates
What are Factors Influencing Penetration Rates?
The hardness and abrasiveness of the rock are inversely related to penetration rates. Harder and more abrasive materials typically reduce the rate of penetration due to increased resistance and wear on the bit.
Features such as face design, button configuration, and carbide quality all play roles. For instance, bits with ballistic buttons are designed for faster penetration in softer rock, whereas flat or dome-shaped buttons are better suited for hard rock but offer slower penetration.
The power output of the drill rig and the efficiency of the hammer's energy transfer significantly affect the bit's penetration rate. Higher air pressure and more powerful rigs generally increase penetration rates.
Operational parameters such as bit load (downward force on the bit) and rotational speed also impact penetration rates. Optimal adjustments can maximize rate depending on the rock conditions.
What are Expected Penetration Rates by Rock Type?
| Rock Type | Typical Rock Hardness (Mohs Scale) | Expected Penetration Rate (feet per minute) |
|---|---|---|
| Soft Rock | 1-3 (e.g., Limestone, Shale) | 10 - 40 |
| Medium Rock | 4-6 (e.g., Sandstone, Basalt) | 5 - 20 |
| Hard Rock | 7-9 (e.g., Quartzite, Granite) | 1 - 10 |
Performance Characteristics
Estimated Lifespan
What are Factors Influencing Lifespan?
Rock Type
Bit Material and Design
Drilling Parameters
Maintenance and Handling
What are Expected Lifespan by Rock Type?
| Rock Type | Typical Rock Hardness (Mohs Scale) | Expected Lifespan (hours of drilling) |
|---|---|---|
| Soft Rock | 1-3 (e.g., Limestone, Shale) | 300 - 600 |
| Medium Rock | 4-6 (e.g., Sandstone, Basalt) | 200 - 400 |
| Hard Rock | 7-9 (e.g., Quartzite, Granite) | 50 - 200 |
FAQ
FAQs
We offer a range of DTH drill bits in sizes varying from 2 inches (51 mm) to 24 inches (610 mm). Our product lineup includes low-pressure, medium-pressure, and high-pressure DTH bits designed to suit various drilling applications, including mining, quarrying, and construction.
Yes, each of our DTH drill bit models comes with a detailed technical specification sheet that includes information on the bit diameter, air pressure ratings, hammer shank type, number of splines, and approximate weight. Additionally, we provide information on recommended rotation speeds and air consumption rates for optimal performance.
Standard features of our DTH drill bits include premium tungsten carbide buttons, robust steel bodies, and optimized flushing holes. Optional features available include face design customization (concave, convex, and flat), enhanced air control systems for better hole cleaning, and reinforced steel bodies for extended wear life.
Our DTH drill bits are manufactured using high-quality alloy steels and premium tungsten carbide for the button tips. This combination provides high strength, exceptional wear resistance, and prolonged operational life under challenging drilling conditions.
We use spherical, ballistic, and conical carbide button types, depending on the application. The choice of button type affects the rate of penetration and the durability of the bit in different rock formations.
We adhere to strict quality control processes starting from the sourcing of raw materials. Each batch of steel and carbide is tested for composition and physical properties using spectrometry and stress testing methods. Compliance with ISO and other relevant standards is ensured in every production step.
Penetration rates vary based on rock hardness and type. For example, in soft rock formations, our bits can achieve penetration rates of 1-2 meters per minute, while in very hard formations, rates might range between 20 and 40 cm per minute.
Our DTH drill bits are designed to handle extreme conditions, including highly abrasive rocks and varying pressures. The design and materials used provide stability and wear resistance, minimizing bit failure and maximizing drilling efficiency.
Typical wear patterns include button flattening, body erosion, and loss of gauge. Our designs mitigate these effects through advanced geometries and reinforced critical areas, extending the service life of the bits.
Yes, we offer customizable options such as varying face designs, button layouts, and special materials to match specific drilling needs and improve drilling efficiency and bit life.
Absolutely. We can design and manufacture DTH drill bits tailored to unique operational requirements, including unusual hole sizes, specific rock conditions, or unique air or fluid flushing requirements.
Our bits are designed to be compatible with a wide range of DTH hammer systems from various manufacturers. We ensure that our shanks and splines meet industry standards for interoperability.
To recommend the most suitable DTH bit, we would need details such as the type of rock, borehole diameter, drilling depth, and the type of drilling rig used. With this information, we can match the optimal bit design to your specific requirements.
Our DTH drill bits are engineered with robust materials and optimized cutting structures to handle mixed and highly abrasive conditions effectively. Features like reinforced button support and special face designs help maintain penetration rates while reducing wear.
Our products are engineered to perform robustly across a spectrum of geological conditions. We offer DTH bits designed for soft, medium, and hard rock formations, ensuring high penetration rates and durability. Specific bit designs incorporate varying carbide button shapes and face profiles to optimize performance in different conditions, such as abrasive, fractured, or consolidated geologies.
To request a quote for our dth bits, please contact our sales team via email at sally@eazydrill.com or use the contact form on our website. Provide details such as product type, sizes, quantities, and any specific requirements you might have. Our team will respond with a detailed quotation within 24 hours.
For bulk orders, we provide tiered discounts based on the quantity purchased. Please contact our sales team for a detailed breakdown of discount levels applicable to your order volume.
We can provide a sample for pre-production confirmation. Please note that the cost of the sample and the international shipping charges will be the responsibility of the customer.
For international orders, we accept TT (Telegraphic Transfer) payments. We require a 30% deposit upon order confirmation, with the remaining 70% balance due prior to shipment.
The average lead time for our orders is about 10 days following receipt of the deposit. This timeframe allows us to ensure that your order meets our strict quality control standards before dispatch.
We offer automobile or rail transportation for destinations in Central Asia. For regions accessible by sea, we arrange shipment directly to the main ports of the destination country using sea transportation. Shipping costs are calculated based on the specific sea freight rates applicable at the time of shipment and will vary according to the destination port and total shipment volume.
We do not directly handle customs clearance and import duties. However, we provide assistance by furnishing all necessary documentation required for customs processes in your country and can advise on best practices to streamline the import process.
Our products are securely packaged using industrial-grade materials designed to withstand long-distance transport. This includes the use of reinforced containers, protective wraps, and moisture barriers to prevent any damage during transit. Each package is clearly labeled with handling instructions to ensure it is treated correctly throughout its journey.
Yes, we provide tracking information for all shipped orders. Once your order is dispatched, you will receive a shipment confirmation that includes a tracking number.
We offer comprehensive after-sales support, including technical assistance, troubleshooting, and warranty services. Our dedicated support team is available via phone, email, or live chat to help resolve any issues and ensure optimal performance of your products.
Yes, we maintain a substantial inventory of spare parts for all our products to ensure quick availability and minimal downtime for our clients. Spare parts can be ordered directly through our customer service or via our online portal.
We provide both training and installation assistance as part of our commitment to customer satisfaction. This can include on-site support from our technicians, as well as comprehensive training materials and video tutorials to ensure you are fully equipped to use and maintain our products effectively.
The maintenance of our DTH bits involves regular inspection for wear and damage, timely replacement of worn bits, and proper storage to avoid corrosion. We recommend cleaning the bits after each use and checking the carbide buttons and flushing holes for blockages or excessive wear. Detailed maintenance guidelines are provided with each product to help extend its lifespan and maintain performance.
Yes, we provide comprehensive operational training materials, including manuals, online tutorials, and live training sessions. These resources cover everything from installation and operation to maintenance and troubleshooting, ensuring that your team can effectively utilize and maintain the equipment.
We offer exclusive distributorship opportunities in various regions, depending on market conditions and the potential partner’s capability to meet sales and support standards. Interested parties are encouraged to contact us directly to discuss the specific requirements and potential for exclusivity in their region.
Long-term partners benefit from preferential pricing, priority support, extended warranties, and exclusive access to new products and innovations. We foster close relationships with our long-term partners, offering them insights into product development and strategic planning to enhance their competitive edge.
Yes, we actively collaborate with overseas partners on product development. This collaboration can range from customizing existing products to meet specific market needs to jointly developing new products. We value the input and expertise of our partners to ensure our products are well-suited to local requirements and market trends.
Send us a message
Feel Free to Reach Out for Further Details.
Feel free to drop us a message using the form below, or if you prefer, give us a call or send us an email. We’re available to support you from Monday to Friday, 9 AM to 5 PM (your timezone).
