Your Professional Drill Tools Supplier
We are a professional manufacturer and trading company specializing in water well drilling rigs, mining exploration rigs, and related equipment. Supported by an experienced technical team, we operate a modern factory equipped with CNC machining centers, automated welding systems, and advanced testing instruments. Our streamlined production lines and strict quality control ensure consistent reliability and performance. With years of R&D and manufacturing experience, we provide both standard products and customized solutions to meet diverse project requirements.
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![High-pressure DTH Drill Bit]()
High-pressure DTH Drill BitHigh-pressure (HAP) down-the-hole hammer drill bits are core components that work with high-pressure down-the-hole hammers, specifically designed for efficient drilling in ultra-hard rock formations (f=12-20). Our drill bits utilize...view more -
![Top Hammer Drill Bit]()
Top Hammer Drill BitTop hammer drill bits are high-performance rock drilling tools that can be used with top hammer rock drills, rock drills, impact drills, and integrated drilling rigs. They feature high-strength forged steel drill bodies and...view more -
![3 Inch DTH Hammer]()
3 Inch DTH HammerThe 3-inch DTH hammer, part of the ND Valveless series DTH Hammer (model ND35A), is a high-pressure down-the-hole hammer designed and developed independently by our company, using a nylon-tube-less drill bit. It is one of the most...view more -
![4 Inch DTH Hammer]()
4 Inch DTH HammerBrand: YRview more
Model:DHD340
The 4-inch DTH pneumatic hammer equipped with a high-pressure down-the-hole hammer with a nylon tubing drill bit is a valveless high-pressure hammer designed by our company. -
![5 Inch DTH Hammer]()
5 Inch DTH HammerThe 5 inch DTH hammer is a large-diameter, high-efficiency drilling power unit primarily used in large-scale mining, deepwater well drilling, ground-source heat pump projects, and infrastructure projects requiring large-scale...view more -
![6 Inch DTH Hammer]()
6 Inch DTH HammerThis 6-inch down-the-hole hammer (ND65A model), paired with a high-pressure down-the-hole impactor using a nylon-tube-less drill bit, was independently designed and developed by our company and is one of the most advanced impactors in...view more -
![7 Inch DTH Hammer]()
7 Inch DTH HammerThe 7 inch DTH hammer is a top-tier heavy-duty drilling equipment, designed for ultra-large boreholes and extremely demanding drilling conditions. Its standard drilling diameter range is typically between 180mm and 220mm. It represents...view more -
![8 Inch DTH Hammer]()
8 Inch DTH HammerThe 8 inch DTH hammer is a giant in the drilling industry, sitting at the pinnacle of drilling technology and engineering capabilities. Its standard borehole diameter typically ranges from 200mm to 250mm. Designed for ultra-large...view more
Why choose us
Advanced Production Technology
CNC machining, automated welding, and precision testing equipment enable high accuracy and reliability throughout the manufacturing process.
Customized Solutions
We provide flexible customization services based on geological conditions, target depth, borehole diameter, and budget to meet diverse project requirements.
Sales Market
Our products are exported to numerous countries and regions in Africa and Asia, demonstrating our global reach and the trust international markets place in our products.
Quality Control and Testing
Our strict quality control measures and rigorous testing protocols ensure that every product meets international standards for safety, durability, and performance.
3 Inch DTH Hammer
The 3 Inch DTH Hammer is a powerful tool used in drilling operations and is highly sought after by professionals in the industry. This tool is designed to deliver high-power drilling performance and brings about positive results.Equipped with cutting-edge technology and rugged design, the 3 Inch DTH Hammer is perfect for deep drilling and tough terrains. It is a tool that inspires confidence in drillers and provides them with a reliable option for their drilling needs. With its efficiency and reliability, the 3 Inch DTH Hammer has earned a reputation as one of the best drilling hammers in the market.
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Diameter |
Gauge Buttons(mm) |
Front Buttons(mm) |
Weight(KG) |
Part Number |
||||
|
mm |
Inch |
Flat Face |
Convex Face |
Concave Face |
Face Type |
|||
|
90 |
3 1/2 |
Φ14*6 |
Φ12*2 |
Φ13*2 |
/ |
Convex Face |
4.5 |
LN-DHD3.5-90CV |
|
90 |
3 1/2 |
Φ14*6 |
Φ12*4 |
/ |
/ |
Flat Face |
4.5 |
LN-DHD3.5-90FF |
|
95 |
3 3/4 |
Φ14*6 |
Φ13*2 |
Φ13*2 |
/ |
Convex Face |
4.6 |
LN-DHD3.5-95CV |
|
100 |
3 15/16 |
Φ14*6 |
Φ13*2 |
Φ13*3 |
/ |
Convex Face |
4.8 |
LN-DHD3.5-100CV |
|
105 |
4 1/8 |
Φ14*6 |
Φ13*2 |
Φ13*3 |
/ |
Convex Face |
5.0 |
LN-DHD3.5-105CV |
|
105 |
4 1/8 |
Φ13*8 |
Φ12*6 |
/ |
/ |
Flat Face |
5.0 |
LN-DHD3.5 |
Advantages of 3 Inch DTH Hammer
Extended Tool Life
High-quality materials and heat treatments significantly increase bit longevity, reducing replacement frequency and inventory costs.
Increased Productivity
Faster penetration and reliable performance enable more meters drilled per shift, boosting project throughput.
Reduced Operational Downtime
Durable construction and efficient debris removal minimize unplanned stops and bit changes.
Lower Cost Per Meter
Despite higher upfront cost, long-term savings in labor, fuel, and maintenance make these bits economically advantageous.
Adaptability Across Projects
One bit type serves multiple applications, simplifying logistics and training for field crews.
Type of 3 Inch DTH Hammer
Spiral Bits
Designed with helical grooves, spiral DTH bits enhance cuttings removal and allow smooth rotation of the drill pipe. Available in single or double spiral configurations with varying helix angles and groove depths.
Drop-Shaped Bits
Also known as oval or teardrop bits, these feature a streamlined shape that improves hole stability and reduces wall friction. Designed with a reinforced gauge row to prevent hole collapse.
Toe-Paddled Bits
Equipped with stabilizing paddles near the toe (bottom edge), these bits offer enhanced directional control and reduced wall friction. The paddles help maintain consistent hole diameter and alignment.
Multi-Face Bits
The most versatile and widely used 3-inch DTH bits, featuring multiple flat wings (typically 4–12) with various face layouts including round, square, and offset configurations for optimal rock fragmentation.
Applications of 3 Inch DTH Hammer
3-inch DTH bits are widely preferred in deep water well construction due to their precision in maintaining consistent borehole diameter, which is critical for casing installation and long-term well stability.
In quarries, precise blast hole drilling is essential for controlled fragmentation and efficient material extraction. The 3-inch DTH bit provides uniform hole diameter and depth, which enhances the effectiveness of explosive charges by ensuring even energy distribution.
During tunnel construction, 3-inch DTH bits are employed for drilling ventilation shafts, pilot holes, and access tunnels where precision and depth are paramount.
Geothermal energy projects require drilling into high-temperature, abrasive formations to access underground heat sources. 3-inch DTH bits are specifically designed to withstand extreme thermal stress and abrasive rock conditions, thanks to advanced tungsten carbide inserts (TCI) and heat-resistant steel bodies.
In civil engineering, deep foundation systems such as pile sockets, micropiles, and anchored retaining walls demand high-precision drilling to ensure structural stability. The 3-inch DTH bit excels in creating clean, deep holes in bedrock or hard strata, providing a solid base for concrete pouring or anchor installation.
Working Principle of 3 Inch DTH Hammer
Piston and Impact Bit
Inside the 3 Inch DTH Hammer, there is a piston that moves up and down under the influence of compressed air. This motion impacts the back of the drill bit, transmitting a powerful force to the drill bit's face.
Drilling Process
The hammering action combined with the rotational force (if the drill string is rotating) breaks the rock or other materials at the drill bit's face, creating a borehole.
Removing Cuttings
The high-pressure air or drilling fluid also helps to flush out the cuttings from the hole to the surface.
Specifications of 3 Inch DTH Hammer
Outer Diameter (3")
Ensure compatibility with drill rig, hammer, and casing requirements; verify tolerance standards
01
Gauge Buttons
Look for tungsten carbide inserts; check for uniform wear resistance and spacing
02
Shank Type (e.g., T38)
Match exactly with hammer connection; verify thread integrity and sealing surfaces
03
Crown Design
Concave for mixed rock; flat for hard rock; dome for sticky formations
04
Material Hardness (HRC)
Optimal range: 45–52 HRC for body; WCIs should exceed 85 HRA
05
Design and Structure of 3 Inch DTH Hammer
Button Pattern
Radial or spiral arrangements affect rock fracturing efficiency. More buttons increase durability in hard rock; fewer, larger buttons enhance ROP in softer formations.
Flute Design
Wider, deeper flutes improve cuttings evacuation in deep or wet holes. Closed or semi-closed designs offer more structural strength in abrasive conditions.
Face Profile
Flat-face bits are versatile; dish-face designs improve self-centering and straight-hole drilling; convex faces are ideal for very hard rock.
Material & Hardening
Look for bits with through-hardened steel bodies and high-grade tungsten carbide inserts (e.g., 10% cobalt content) for superior wear resistance.
Maintenance
Regular Inspection: Examine the bit after each drilling cycle for signs of damage such as cracked buttons, worn gauge areas, damaged threads, or eroded flushing ports. Early detection prevents further degradation and potential failure downhole.
Cleaning Procedures: Remove mud, rock dust, and debris immediately after use. Soak the bit in warm, soapy water and gently scrub with a soft brush. For stubborn buildup, use low-pressure water washing—avoid high-pressure jets that could damage seals or carbide inserts.
Lubrication Management: Apply manufacturer-recommended grease to threads and O-ring grooves before installation. Proper lubrication reduces galling, prevents corrosion, and ensures smooth coupling and uncoupling of connections.
Storage Conditions: Store bits in a dry, temperature-controlled environment, preferably in protective cases or racks. Avoid stacking bits directly on top of each other to prevent impact damage.
Repair and Refurbishment: Damaged components such as worn O-ring grooves, stripped threads, or broken shanks can often be repaired through re-machining or welding by certified technicians. Refurbished bits can restore up to 90% of original performance at a fraction of replacement cost.
FAQ
As one of the leading drill tools manufacturers and suppliers in China, we warmly welcome you to buy high-grade drill tools for sale here from our factory. All customized products are with high quality and competitive price.
