Drag Bit
Durable Rotary Drag Bits are built for reliable performance in soft to medium formations where clean cuttings, steady penetration, and low operating costs matter most.
Designed around simple but highly effective fixed-blade geometry, these bits cut rather than crush, producing clear, easy-to-log cuttings while keeping torque and vibration under control.
They are widely used in water well, environmental, and shallow exploration drilling, especially where consistent hole quality and smooth drilling progress are priorities.
For contractors who need predictable performance in sand, clay, shale, and soft limestone, these drag bits offer a practical balance between speed, durability, and value.
Durable Rotary Drag Bits are among the oldest and most practical cutting tools in rotary drilling, yet they remain highly relevant in modern water well and shallow formation drilling. Their value lies not in complexity, but in intelligent simplicity: fixed blades tipped with tungsten carbide shear the formation cleanly, generate well-formed cuttings, and maintain stable hole geometry without relying on moving parts.
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Basial Specification |
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Drag Bit Size |
2''~17 1/2'' |
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Drag Bit Connection |
2 3/8''~6 5/8'' API reg pin |
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Make up Torque |
4-4.8/6-7.5/9.5-12/16-22/38-43/46-54 |
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Blades Quantity |
3NZ |
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Drag Bit Formation |
soft,medium soft,hard, medium hard,very hard formation |
Specification parameters
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specifications |
Inch |
Model of pdc cutter |
Thread |
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98mm |
3 7/8 inch |
13mm |
2 3/8REG |
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114mm |
4 1/2 inch |
13mm16mm19mm |
2 3/8REG 2 7/8REG |
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130mm |
5 1/8 inch |
13mm16mm19mm |
2 3/8REG 2 7/8REG |
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140mm |
5 1/2 inch |
13mm16mm19mm |
2 3/8REG 2 7/8REG |
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152mm |
6 inch |
13mm16mm19mm |
2 3/8REG 2 7/8REG 3 1/2REG |
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165mm |
6 1/2 inch |
13mm16mm19mm |
2 3/8REG 2 7/8REG 3 1/2REG |
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171mm |
6 3/4 inch |
13mm16mm19mm |
2 3/8REG 2 7/8REG 3 1/2REG |
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178mm |
7 inch |
13mm16mm19mm |
2 3/8REG 2 7/8REG 3 1/2REG |
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190mm |
7 1/2 inch |
13mm16mm19mm |
2 3/8REG 2 7/8REG 3 1/2REG 4 1/2REG |
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200mm |
7 7/8 inch |
13mm16mm19mm |
2 3/8REG 2 7/8REG 3 1/2REG 4 1/2REG |
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215mm |
8 1/2 inch |
13mm16mm19mm |
2 7/8REG 3 1/2REG 4 1/2REG |
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222mm |
8 3/4 inch |
13mm16mm19mm |
2 7/8REG 3 1/2REG 4 1/2REG |
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250mm |
9 7/8 inch |
13mm16mm19mm |
3 1/2REG 4 1/2REG 6 5/8REG |
Product Design & Working Principle
Unlike roller cone or PDC bits that crush or scrape with multiple cutting mechanisms, drag bits rely on continuous shearing action. As the drag bit rotary drill rotates, each blade engages the formation at a controlled angle, slicing the rock or soil while flushing fluid carries cuttings upward through the waterways. This straightforward mechanism reduces mechanical failure risk and makes drag bits exceptionally predictable in soft ground.
Our water well drag bits are engineered with carefully shaped blades and optimized junk slots to balance three critical factors: penetration rate, cuttings evacuation, and bit stability. The blade geometry determines how aggressively the bit cuts, while the spacing between blades ensures that cuttings do not clog or recirculate at the bit face. This combination is particularly effective in sand, clay, soft shale, and unconsolidated sediments.
Key Product Features
- Fixed-Blade Simplicity: No moving parts, fewer failure points, easier maintenance.
- Tungsten Carbide Protection: Hardfacing and carbide inserts are strategically placed on cutting edges to extend wear life.
- Optimized Waterways: Wide junk slots allow efficient cuttings removal and reduce bit balling in sticky formations.
- Stable Drilling Behavior: Balanced blade layout minimizes vibration and helps maintain straight holes.
- Broad Compatibility: Designed to work with standard rotary rigs, top-drive systems, and mud or air flushing.
Manufacturing Process & Material Control
- Every batch of our rotary drag bits begins with high-strength alloy steel forgings that undergo strict chemical composition verification. Blades are precision-cut, heat-treated, and then hardfaced with premium tungsten carbide to enhance abrasion resistance.
- During assembly, we apply controlled welding procedures to ensure uniform bead distribution and minimize residual stress. Each bit is then machined to exact thread tolerances and dynamically balanced before final inspection. This process ensures that our drag bits for water well drilling deliver consistent performance from the first meter to the last.
Quality Inspection & Field Validation
Quality is not just checked in the factory—it is proven in the field. Our inspection protocol includes:
- Visual and dimensional inspection of blades and threads
- Ultrasonic testing of weld integrity on critical zones
- Hardness testing on carbide-treated surfaces
- Trial run simulation to verify flushing efficiency
Only bits that pass all criteria are approved for shipment, ensuring reliability in real-world drilling operations.
Performance Advantages in Water Well Drilling
In water well projects, stable hole quality is as important as speed. Our drag bit drilling solutions are designed to:
- Reduce torque fluctuations in loose formations
- Maintain smooth wall conditions for casing installation
- Produce well-defined cuttings that help geologists interpret strata
- Minimize bit balling in sticky clays through optimized blade spacing
Compared to conventional drag bits, our design improves penetration consistency while extending service life, ultimately lowering cost per meter drilled.
Practical Field Applications
Our drag bits are widely used across:
- Water well drilling
- Environmental site investigation
- Geothermal shallow drilling
- Pilot hole drilling for larger boreholes
- Construction and foundation pre-drilling
They are particularly effective in unconsolidated sediments, soft shale, sandy layers, and weathered rock zones.
Real-World Case Study
- Project Location: South Africa – Rural Water Supply Program (Limpopo Province)
- Formation: Alternating layers of sand, clay, and soft shale
- A local drilling contractor initially used generic step drag bits that wore out quickly and frequently balled up in sticky clay, causing repeated tripping and lost time. After switching to our Durable Rotary Drag Bits (Step Type), they reported significant improvements:
- Bit life increased by approximately 30–35%
- Drilling torque became more stable, reducing rig stress
- Cuttings evacuation improved, with fewer blockages
- Overall drilling efficiency increased by 20%+
Customer feedback:
“The new drag bits handled the clay layers much better. We spent less time cleaning the bit and more time drilling. For rural water wells, this reliability makes a real difference.”
Service, Customization & Delivery
- We offer full customization in terms of blade design, thread type, diameter, and cutting profile to match specific rigs and formations. Our production capacity supports both small batch orders and large project deliveries, with global shipping and technical support available.
- As an ISO-certified manufacturer with advanced CNC facilities and experienced engineers, we ensure consistent quality, fast response times, and reliable after-sales service for all our drag bits.
FAQ
Q1: Are drag bits suitable for hard rock?
A: No. They perform best in soft to medium formations such as sand, clay, shale, and soft limestone. For hard rock, PDC or tricone bits are recommended.
Q2: Which is better, step or chevron drag bits?
A: Step bits are faster in very soft formations, while chevron bits offer better durability in slightly harder or more abrasive ground.
Q3: Can these bits be used with air drilling?
A: Yes, especially in dry or low-water formations, provided adequate airflow is maintained for cuttings removal.
Q4: Do you support custom diameters and threads?
A: Yes. We can customize diameter, thread type, and blade profile based on your rig and formation.
Q5: What affects drag bit lifespan?
A: Formation abrasiveness, weight on bit, rotary speed, flushing efficiency, and operator technique all play key roles.
Q6: Are these compatible with standard rotary rigs?
A: Yes, our drag bits are designed to fit widely used rotary drill systems.
Why Choose Us
Wide range of applications
Our products are widely used in earthwork, mining, oil and gas well drilling, water well engineering and construction, geothermal drilling, geological survey, etc.
Sales market
Our products have gained a strong foothold in over 30 countries, including key markets such as Australia, Canada, South Africa, and Russia.
Quality control
All our products strictly comply with the requirements of the international quality management system. We consistently track and monitor IQC, IPQC, and OQC throughout the entire production process.
Rich experience
Backed by a dedicated R&D team of senior engineers and technical experts with over 20 years of industry experience, TANK continuously innovates to meet the evolving demands of the drilling industry.
Suitable for soft, medium and hard formations.
Super strong material promotes gauge wear resistance to provide long bit life.
PDC cutter can improve the life and shield the risk of complex formation drill not passed.
Drilling dynamic equilibrium design and hydraulic balance design make the drilling process more smooth.
Specification
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Item |
Value |
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Condition |
New |
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Warranty |
6 Months |
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Applicable Industries |
Building Material Shops, Farms, Retail, Construction works , Energy & Mining |
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Weight (KG) |
8 |
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Showroom Location |
None |
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Video outgoing-inspection |
Provided |
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Machinery Test Report |
Provided |
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Brand Name |
YKdrill |
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Type |
DRILL BIT |
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Machine Type |
Drilling Tool |
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Material |
Carbide |
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Processing Type |
Forging |
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Use |
Well Drilling |
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Product name |
Carbide drill bit |
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Use |
Geological drilling and coal mining |
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Usage |
Well drilling ;Coal miniing, Rock drilling |
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Diameter |
Provide Customized |
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Packing |
Wooden Box |
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Blade |
3-6Blades |
Application of Scraper drill bit
Products are widely used in well drilling, geological exploration, coal mines, mining stone, oil and gas mining, roads, railways,bridges, water conservancy and hydropower, engineering anchoring, construction and other industries.
Product Paramenters
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PDC Common size: |
PDC Bits: From 2 7/8” to 36” PDC core bits: 36mm, 45mm, 50mm, 56mm, 60mm, 65mm, 75mm, 94mm, 98mm, 112mm, 118mm, 120mm, 132mm, 140mm, 149mm, 152mm, 171mm,180mm, 190mm, 203mm, 254mm, 280mm, 300mm , 330mm, etc. |
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PDC bolt bit for coal mine: |
26mm/27mm/28mm/29mm/30mm/32mm/42mm/43mm/55mm etc. |
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Blade number: |
2 Blades, 3 Blades, 4 Blades, 5 Blades, 6 Blades, 7 Blades, 8 Blades |
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PDC cutter: |
0905,1004,1005,1304, 1305, 1306,1308, 1313, 1608,1613, 1908, 1913, as required |
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Strata： |
Soft, medium soft, hard, medium hard, very hard formations |
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Material： |
Steel, carbide, diamond, PDC tools |
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Application： |
Water Well Drilling/Mining/Geological Drilling/Oil and Gas Extraction |
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Package： |
Wooden case or carton |
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Payment method： |
T/T,L/C,Western Union ,Paypal |
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Delivery time： |
After receiving payment,Regular products within 2 days, customized products within 15-30 days |
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Delivery conditions： |
Sea or Air or Ground or Express |
Packing & Delivery
FAQ
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