KQ Series Low Air Pressure DTH Hammer – Cost-Effective Drilling for Soft to Medium-Hard Rock (Φ50–Φ150mm)

The KQ Series Low Air Pressure Down-the-Hole (DTH) Hammer is a comprehensive product line designed for shallow to medium-deep drilling applications in soft, medium, and hard rock formations. Engineered for simplicity and economy, this series delivers reliable performance with low air consumption, making it the preferred choice for small to medium-sized contractors and mining operations.

Featuring a straightforward valved design, the KQ Series operates efficiently at 4–10 Bar working pressure, perfectly matched with standard low-pressure air compressors (0.5–0.7 MPa). The series covers a wide hole diameter range from Φ50mm to Φ150mm, with models tailored for everything from micro-pile anchoring to large-scale open-pit blasting.

All KQ Series hammers are built with durable materials and heat-treated components to withstand demanding job site conditions. Their modular construction allows for easy maintenance and quick parts replacement, minimizing costly downtime.

1. Water Well Drilling

Used for shallow to medium-depth water well construction in soft to medium-hard rock formations. The KQ Series offers reliable penetration and excellent hole straightness, ensuring efficient water well completion with minimal deviation.

2. Open-Pit Mining & Quarrying

Widely applied in small to medium-sized open-pit mines and quarries for blast hole drilling. Models like KQ90 and KQ110B deliver consistent performance in production blasting, helping operations achieve optimal fragmentation with lower drilling costs.

3. Construction & Civil Engineering

Ideal for anchor drilling, micro-pile installation, and slope stabilization projects. The smaller models (ND65A/CIR50, KQ60) are particularly well-suited for urban construction sites where compact equipment and shallow-hole capability are required.

4. Foundation Engineering & Hydropower Projects

Used for dam foundation anchoring, tunnel pre-grouting, and large-scale foundation works. The KQ Series provides dependable drilling performance in challenging site conditions, contributing to project safety and schedule adherence.

5. Mineral Exploration

Employed in exploration drilling programs where moderate hole depths and variable rock conditions are encountered. The wide model range allows drilling teams to adapt quickly to changing formation requirements.

1. Exceptional Cost-Effectiveness

The KQ Series offers the best price-to-performance ratio among low-pressure DTH hammers. With simple valved construction and low manufacturing costs, these hammers provide reliable drilling performance without requiring expensive high-pressure compressor systems. This makes them the ideal choice for budget-conscious contractors and small to medium-scale operations.

2. Low-Pressure Compressor Compatibility

Engineered specifically for 4–10 Bar working pressure, the KQ Series perfectly matches standard low-pressure air compressors rated at 0.5–0.7 MPa. Operators can utilize existing compressor fleets without capital investment in new high-pressure equipment, significantly reducing operational entry barriers.

3. Comprehensive Model Selection

With hole diameter coverage from Φ50mm to Φ150mm across six distinct models, the KQ Series addresses nearly every shallow to medium-depth drilling requirement. This extensive product range allows users to precisely match the hammer to their specific rock conditions, hole size, and depth needs without over-specifying or under-performing.

4. Simple Maintenance & High Serviceability

Featuring fewer internal components and a straightforward valved design, the KQ Series enables rapid field servicing and component replacement. Spare parts are widely available through global distribution channels, and routine maintenance can be performed with standard workshop tools, minimizing downtime and reducing reliance on specialized technicians.

5. Proven Durability in Harsh Conditions

All critical internal components are heat-treated for enhanced wear resistance, while the robust outer casing provides reliable protection against abrasive drilling environments. This rugged construction ensures consistent impact performance and extended service life, even when drilling in fractured or abrasive rock formations.

6. Versatile Application Coverage

From lightweight anchoring work to heavy-duty production blasting, the KQ Series spans the full spectrum of low-pressure drilling applications. This versatility enables drilling contractors to standardize on a single product family across multiple job sites, simplifying inventory management and operator training.

Q1: What rock hardness is the KQ Series suitable for?

The KQ Series covers soft to hard rock. Choose the model based on your specific rock conditions – harder rock requires larger models with higher impact energy.

Q2: What air pressure is required?

All KQ Series hammers operate at 4–10 Bar (0.5–0.7 MPa), matching standard low-pressure air compressors. Do not exceed the maximum rated pressure.

Q3: How do I select the right model?

Follow this principle: First determine hole diameter and depth → Then select the hammer → Finally match the compressor and drill rig. For anchoring work, choose ND65A/CIR50 or KQ60. For standard quarry blasting, KQ90 is the most popular choice. For large-scale mining, go with KQ110B.

Q4: What happens if my compressor is undersized?

Insufficient air delivery will cause slow penetration, poor chip removal, and increased bit wear. Always ensure compressor output meets or exceeds the hammer's maximum air consumption.

Q5: Can KQ hammers drill in water-bearing formations?

Yes, with proper lubrication and optional non-return valve configurations, KQ hammers can operate effectively in wet drilling conditions.

Q6: What is the service life of KQ Series components?

With proper maintenance and lubrication, internal parts typically last 800–1,500 drilling hours, depending on rock abrasiveness and operating parameters.

Q7: Are spare parts readily available?

Yes, KQ Series hammers are among the most widely used low-pressure hammers globally, and spare parts are stocked by most drilling supply distributors.