The SD Series High Air Pressure DTH Hammer is engineered for high-performance down-the-hole drilling in medium to deep borehole applications. Designed for demanding drilling conditions, it is widely used in water well drilling, mining exploration, quarry blasting, geothermal drilling, and foundation engineering projects where high penetration efficiency and reliable performance are required.
Manufactured from premium heat-treated alloy steel with precision-machined internal components, the SD Series delivers powerful and stable impact energy while maintaining excellent wear resistance under high-pressure air conditions. The optimized air distribution system minimizes energy loss, improves drilling speed, and reduces air consumption, helping contractors achieve higher productivity and lower operating costs.
The SD Series includes multiple models ranging from SD4 to SD12, covering hole diameters from 110 mm to 400 mm. Different hammer sizes are available to match various drilling rigs, drill rods, and bit shanks, making the series suitable for both standard water well drilling and large-diameter foundation drilling applications. The hammers are compatible with standard API thread connections and widely used DTH drilling systems.
With a working pressure ranging from 1.0 MPa to 3.3 MPa, the SD Series provides consistent drilling performance in soft, medium, and hard rock formations. Its robust structure, easy maintenance, and interchangeable spare parts contribute to a long service life and reduced downtime in the field.
Whether for water supply wells, blast hole drilling, geothermal energy projects, or infrastructure construction, the SD Series offers dependable drilling efficiency, stable operation, and cost-effective performance for professional drilling contractors worldwide.
To start cooperation: send your inquiry → get a tailored technical solution & quotation → confirm order → production & testing → fast shipment → long-term spare parts & technical support. We respond quickly and support you throughout the whole project.
Not sure which DTH hammer series fits your job?Tell us your required hole diameter and depth, our engineers will recommend the best-matched hammer series and model for your rig and formation.
SD4 Parts List |
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| Ref. | Parts | Weight | Part No. |
| 1 | Top Sub | 8.8 Kg | 01-SD4-01 |
| 2 | "O" Ring | 0.01 Kg | 01-SD4-02 |
| 3 | Check Valve | 0.46 Kg | 01-SD4-03 |
| 4 | Spring | 0.04 Kg | 01-SD4-04 |
| 5 | Rubber Buffer | 0.2 Kg | 01-SD4-05 |
| 6 | Valve Seat | 2.1 Kg | 01-SD4-06 |
| 7 | Inner Cylinder | 2.45 Kg | 01-SD4-07 |
| 8 | Piston | 9 Kg | 01-SD4-08 |
| 9 | Piston Case | 15.6 Kg | 01-SD4-09 |
| 10 | Retainer Ring | 0.2 Kg | 01-SD4-10 |
| 11 | "O" Ring | 0.01 Kg | 01-SD4-11 |
| 12 | Drive Chuck | 4 Kg | 01-SD4-12 |
| 13 | Drill Bit | — | 01-SD4-13 |
Technical Parameters |
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| Item | Parameter | ||
| Length (Less bit) | 1082 mm | ||
| Weight | 43 Kg | ||
| Outer Diameter | 99 mm | ||
| Connection Thread | API 2 3/8" REG | ||
| Bit Shank | SD4 | ||
| Hole Range | 110–135 mm | ||
| Work Pressure | 1.0–2.2 MPa | ||
| Recommended rotation speed | 30–60 r/min | ||
| Air Consumption (1.8 MPa) | 5.5 m³/min | ||
| Air Consumption (2.4 MPa) | 10 m³/min |
SD5 Parts List |
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| Ref. | Parts | Weight | Part No. |
| 1 | Top Sub | 14.7 Kg | 01-SD5-01 |
| 2 | "O" Ring | 0.02 Kg | 01-SD5-02 |
| 3 | Check Valve | 1 Kg | 01-SD5-03 |
| 4 | Spring | 0.06 Kg | 01-SD5-04 |
| 5 | Rubber Buffer | 0.2 Kg | 01-SD5-05 |
| 6 | Valve Seat | 4.1 Kg | 01-SD5-06 |
| 7 | Inner Cylinder | 4.4 Kg | 01-SD5-07 |
| 8 | Piston | 17.3 Kg | 01-SD5-08 |
| 9 | Piston Case | 23.5 Kg | 01-SD5-09 |
| 10 | Retainer Ring | 0.5 Kg | 01-SD5-10 |
| 11 | "O" Ring | 0.01 Kg | 01-SD5-11 |
| 12 | Drive Chuck | 7.8 Kg | 01-SD5-12 |
| 13 | Drill Bit | — | 01-SD5-13 |
Technical Parameters |
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| Item | Parameter | ||
| Length (Less bit) | 1178 mm | ||
| Weight | 73.6 Kg | ||
| Outer Diameter | 125 mm | ||
| Connection Thread | API 2 3/8" REG | ||
| Bit Shank | SD5 | ||
| Hole Range | 135–155 mm | ||
| Work Pressure | 1.0–2.5 MPa | ||
| Recommended rotation speed | 30–60 r/min | ||
| Air Consumption (1.8 MPa) | 9 m³/min | ||
| Air Consumption (2.4 MPa) | 15 m³/min |
SD6 Parts List |
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| Ref. | Parts | Weight | Part No. |
| 1 | Top Sub | 20.3 Kg | 01-SD6-01 |
| 2 | "O" Ring | 0.02 Kg | 01-SD6-02 |
| 3 | Check Valve | 0.8 Kg | 01-SD6-03 |
| 4 | Spring | 0.05 Kg | 01-SD6-04 |
| 5 | Rubber Buffer | 0.3 Kg | 01-SD6-05 |
| 6 | Valve Seat | 5 Kg | 01-SD6-06 |
| 7 | Inner Cylinder | 4 Kg | 01-SD6-07 |
| 8 | Piston | 23.5 Kg | 01-SD6-08 |
| 9 | Piston Case | 34.5 Kg | 01-SD6-09 |
| 10 | Retainer Ring | 0.5 Kg | 01-SD6-10 |
| 11 | "O" Ring | 0.01 Kg | 01-SD6-11 |
| 12 | Guided Sleeve | 1.6 Kg | 01-SD6-12 |
| 13 | Drive Chuck | 8 Kg | 01-SD6-13 |
| 14 | Drill Bit | — | 01-SD6-14 |
Technical Parameters |
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| Item | Parameter | ||
| Length (Less bit) | 1277 mm | ||
| Weight | 99 Kg | ||
| Outer Diameter | Φ142 mm | ||
| Connection Thread | API 3 1/2" REG | ||
| Bit Shank | SD6 | ||
| Hole Range | 150–190 mm | ||
| Work Pressure | 1.0–2.5 MPa | ||
| Recommended rotation speed | 30–60 r/min | ||
| Air Consumption (1.8 MPa) | 20 m³/min | ||
| Air Consumption (2.4 MPa) | 28 m³/min |
SD8 Parts List |
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| Ref. | Parts | Weight | Part No. |
| 1 | Top Sub | 42 Kg | 01-SD8-01 |
| 2 | Adjuster Shim | 0.2 Kg | 01-SD8-02 |
| 3 | "O" Ring | 0.02 Kg | 01-SD8-03 |
| 4 | Check Valve | 1.3 Kg | 01-SD8-04 |
| 5 | Spring | 0.09 Kg | 01-SD8-05 |
| 6 | Rubber Buffer | 0.4 Kg | 01-SD8-06 |
| 7 | Valve Seat | 12.7 Kg | 01-SD8-07 |
| 8 | Inner Cylinder | 9.1 Kg | 01-SD8-08 |
| 9 | Piston | 43.5 Kg | 01-SD8-09 |
| 10 | Piston Case | 64.5 Kg | 01-SD8-10 |
| 11 | Retainer Ring | 1.25 Kg | 01-SD8-11 |
| 12 | "O" Ring | 0.02 Kg | 01-SD8-12 |
| 13 | Guided Sleeve | 3.35 Kg | 01-SD8-13 |
| 14 | Drive Chuck | 16 Kg | 01-SD8-14 |
| 15 | Drill Bit | — | 01-SD8-15 |
Technical Parameters |
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| Item | Parameter | ||
| Length (Less bit) | 1463 mm | ||
| Weight | 194 Kg | ||
| Outer Diameter | 180 mm | ||
| Connection Thread | API 4 1/2" REG | ||
| Bit Shank | SD8 | ||
| Hole Range | 195–254 mm | ||
| Work Pressure | 1.5–3.3 MPa | ||
| Recommended rotation speed | 30–60 r/min | ||
| Air Consumption (1.8 MPa) | 26 m³/min | ||
| Air Consumption (2.4 MPa) | 34 m³/min |
SD10 Parts List |
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| Ref. | Parts | Weight | Part No. |
| 1 | Top Sub | 60 Kg | 01-SD10-01 |
| 2 | "O" Ring | 0.03 Kg | 01-SD10-02 |
| 3 | Check Valve | 1.5 Kg | 01-SD10-03 |
| 4 | Spring | 0.2 Kg | 01-SD10-04 |
| 5 | Valve Seat | 12.8 Kg | 01-SD10-05 |
| 6 | Inner Cylinder | 13.5 Kg | 01-SD10-06 |
| 7 | Piston | 71 Kg | 01-SD10-07 |
| 8 | Piston Case | 85 Kg | 01-SD10-08 |
| 9 | Retainer Ring | 2.76 Kg | 01-SD10-09 |
| 10 | "O" Ring | 0.02 Kg | 01-SD10-10 |
| 11 | Guided Sleeve | 5 Kg | 01-SD10-11 |
| 12 | Drive Chuck | 21 Kg | 01-SD10-12 |
| 13 | Drill Bit | — | 01-SD10-13 |
Technical Parameters |
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| Item | Parameter | ||
| Length (Less bit) | 1413 mm | ||
| Weight | 273 Kg | ||
| Outer Diameter | 225 mm | ||
| Connection Thread | API 5 1/2" REG | ||
| Bit Shank | SD10 | ||
| Hole Range | 254–311 mm | ||
| Work Pressure | 1.5–3.3 MPa | ||
| Recommended rotation speed | 25–50 r/min | ||
| Air Consumption (1.8 MPa) | 40 m³/min | ||
| Air Consumption (2.4 MPa) | 60 m³/min |
SD12 Parts List |
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| Ref. | Parts | Weight | Part No. |
| 1 | Top Sub | 134 Kg | 01-SD12-01 |
| 2 | Adjuster Shim | 0.8 Kg | 01-SD12-02 |
| 3 | "O" Ring | 0.04 Kg | 01-SD12-03 |
| 4 | Check Valve | 1.5 Kg | 01-SD12-04 |
| 5 | Spring | 0.2 Kg | 01-SD12-05 |
| 6 | Valve Seat | 21 Kg | 01-SD12-06 |
| 7 | Inner Cylinder | 29 Kg | 01-SD12-07 |
| 8 | Piston | 118 Kg | 01-SD12-08 |
| 9 | Piston Case | 220 Kg | 01-SD12-09 |
| 10 | Retainer Ring | 5.2 Kg | 01-SD12-10 |
| 11 | "O" Ring | 0.03 Kg | 01-SD12-11 |
| 12 | Guided Sleeve | 5.2 Kg | 01-SD12-12 |
| 13 | Adjuster Shim | 0.8 Kg | 01-SD12-13 |
| 14 | Drive Chuck | 53.5 Kg | 01-SD12-14 |
| 15 | Drill Bit | — | 01-SD12-15 |
Technical Parameters |
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| Item | Parameter | ||
| Length (Less bit) | 1825 mm | ||
| Weight | 589 Kg | ||
| Outer Diameter | 275 mm | ||
| Connection Thread | API 6 5/8" REG | ||
| Bit Shank | SD12 | ||
| Hole Range | 295–400 mm | ||
| Work Pressure | 1.5–3.3 MPa | ||
| Recommended rotation speed | 25–50 r/min | ||
| Air Consumption (1.8 MPa) | 50 m³/min | ||
| Air Consumption (2.4 MPa) | 70 m³/min |
1. Water Well Drilling
The SD Series is widely used in residential, agricultural, and small municipal water well drilling projects. It provides stable penetration performance in both soft soil and hard rock formations, making it ideal for shallow to medium-depth wells.
2. Small to Medium Mining Projects
Suitable for blast hole drilling in small mining operations. The SD hammer delivers consistent impact energy, ensuring efficient rock fragmentation and stable drilling performance.
3. Quarrying Operations
Used in limestone, granite, and other quarry drilling applications. It provides reliable performance for medium-depth blast hole drilling with reduced operational cost.
4. Construction Foundation Engineering
Applied in building foundations, slope stabilization, and anchor hole drilling. The compact structure allows operation in confined or complex working environments.
5. Geological Exploration
Ideal for geological survey drilling and sampling projects requiring stable penetration and accurate borehole formation.
High impact energy for faster penetration rate
Optimized air distribution system for lower air consumption
Heat-treated alloy steel body for long service life
Stable performance in medium to hard rock formations
Easy maintenance and simple structure design
Compatible with standard DTH drilling systems
Suitable for deep borehole drilling operations
Q1: What type of drilling projects is the SP hammer suitable for?
It is suitable for water well drilling, mining exploration, quarry blasting, construction foundation, and geothermal drilling projects.
Q2: What drill bit sizes are recommended?
The recommended DTH bit sizes range from 115mm to 165mm, with 138mm, 146mm, and 152mm being the most commonly used sizes.
Q3: What air compressor is required?
A high-pressure screw air compressor with a working pressure of 1.7–3.5 MPa is recommended for optimal performance.
Q4: How deep can it drill?
The SP Series can reach drilling depths of approximately 100–400 meters, depending on rock conditions and equipment configuration.
Q5: Can it be used with existing drilling rigs?
Yes, it is compatible with standard DTH drilling systems and can be easily integrated into most conventional rigs.
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