Mission Series High Air Pressure DTH Button Bit – Classic Proven Design for Soft to Medium-Hard Rock (Φ108–Φ203mm)

The Mission Series High Air Pressure Down-the-Hole (DTH) Button Bit is a globally recognized, classic design that has been proven in countless drilling operations worldwide. Engineered for excellent value and reliable performance, this series offers a cost-effective solution for soft to medium-hard rock formations, including limestone, sandstone, and other sedimentary rocks.

The Mission Series features a versatile design that performs exceptionally well under unstable air pressure conditions, making it the preferred choice for drilling contractors operating with variable compressor outputs. The robust construction and optimized button configurations ensure consistent penetration rates and extended service life, even in challenging drilling environments.

Available in multiple model families – M30, M40, M50, M60, and M80 – covering head diameters from Φ105mm to Φ305mm, the Mission Series provides comprehensive coverage for a wide range of drilling applications. The HM40, HM50, HM60, and HM5C models offer specific configurations for high-pressure DTH drilling, with optimized shank lengths, spline configurations, and button layouts to ensure perfect compatibility with leading high-pressure DTH hammer brands.

Whether you are drilling blast holes in quarries, production holes in open-pit mines, or water wells in sedimentary rock formations, the Mission Series delivers the performance, durability, and cost-effectiveness you need to maximize productivity and minimize operating costs.

1. Quarrying & Dimension Stone

Widely applied in quarry operations for production blasting and dimension stone extraction in limestone and sandstone formations. The Mission Series offers the button configurations and face designs needed to achieve optimal fragmentation while maintaining hole quality. The HM50 series is a popular choice for medium-sized quarry operations requiring Φ140–178mm holes.

2. Open-Pit Mining

Used extensively for production blasting in open-pit mining operations, particularly in sedimentary rock formations. The Mission Series delivers the impact resistance and penetration rates required for efficient fragmentation while maintaining cost-effectiveness. The HM60 series provides excellent performance for large-diameter blast holes in mining applications.

3. Water Well Drilling

Employed for medium-to-deep water well construction in soft to medium-hard rock formations. The Mission Series provides the durability and penetration rates needed for efficient water well drilling, with the HM50 and HM60 series offering excellent performance for production wells.

4. Construction & Foundation Work

Ideal for foundation piling, rock anchoring, and civil infrastructure projects in soft to medium-hard rock conditions. The Mission Series provides the reliability and cost-effectiveness required for demanding foundation applications.

5. Cost-Sensitive Projects

Specifically designed for projects where budget constraints are a primary consideration. The Mission Series offers excellent value without compromising performance, making it the preferred choice for cost-sensitive drilling operations.

6. Variable Air Pressure Conditions

The Mission Series performs exceptionally well under unstable air pressure conditions, making it ideal for operations where compressor output may fluctuate due to equipment age, maintenance issues, or site power limitations.

1. Classic Proven Design

The Mission Series features a time-tested design that has been proven in countless drilling operations worldwide. This classic design offers reliable performance and predictable results, reducing operational risk and ensuring consistent drilling outcomes.

2. Excellent Cost-Effectiveness

Engineered for exceptional value, the Mission Series delivers reliable drilling performance at a competitive price point. The optimized button configurations and durable construction ensure extended service life, resulting in lower cost per drilled meter and reduced operating expenses.

3. Superior Performance in Soft to Medium-Hard Rock

Specifically designed for limestone, sandstone, and other sedimentary rock formations, the Mission Series offers optimal penetration rates and button life in these rock types. The ball and bullet button combinations provide effective cutting action while maintaining durability.

4. Unstable Air Pressure Tolerance

The Mission Series design performs exceptionally well under variable air pressure conditions, maintaining consistent impact energy and penetration rates even when compressor output fluctuates. This tolerance reduces sensitivity to equipment variations and extends usable compressor life.

5. Versatile Face Designs

Available in convex, flat, and concave face configurations, the Mission Series allows operators to select the optimal face design for their specific rock conditions and drilling requirements.

6. Multiple Shank Compatibility

With options including 228mm (HM40), 260mm (HM50), and 231mm (HM40, HM60, HM5C) shank lengths, and 8-spline (HM5C) or 12-spline (HM40, HM50, HM60) configurations, the Mission Series ensures compatibility with a wide range of high-pressure DTH hammers.

7. Optimized Button Configurations

The spherical, ballistic, and ball + bullet button combinations are specifically engineered for soft to medium-hard rock formations, providing:

Spherical buttons: Superior wear resistance and impact strength.

Ballistic buttons: Enhanced cutting action for faster penetration.

Ball + bullet combination: Balanced performance for variable rock conditions.

8. Broad Hole Diameter Coverage

With models covering head diameters from Φ105mm to Φ305mm across the M30, M40, M50, M60, and M80 families, the Mission Series addresses nearly every drilling requirement in its target rock range.

Q1: What are the shipping methods and delivery lead times?

We offer sea freight (20–30 days), air freight (5–7 days), and express courier (3–5 days). Standard production takes 15–20 working days, with custom orders slightly longer. Exact delivery schedules are confirmed upon order placement.

Q2: What after-sales service and technical support do you provide?

We provide a 12-month warranty against manufacturing defects, free remote technical support via phone, email, or video call, and on-site assistance upon request (travel costs apply). Maintenance manuals and genuine spare parts are also available for long-term support.

Q3: What payment methods do you accept?

We accept T/T (30% deposit + 70% before shipment), L/C at sight or usance, Western Union, and PayPal for samples. Alibaba Trade Assurance is also available. Terms can be negotiated based on order volume and credit history.

Q4: What rock types are the Mission Series suitable for?

The Mission Series is specifically designed for soft to medium-hard rock formations, including limestone, sandstone, and other sedimentary rocks. For harder igneous or metamorphic rocks, we recommend our SP Series high-pressure button bits.

Q5: What is the difference between HM40, HM50, HM60, and HM5C?

HM40 (Φ108–130mm, 228mm shank, 12 spline) is designed for smaller diameter holes. HM50 (Φ140–178mm, 260mm shank, 12 spline) covers medium diameters. HM60 (Φ154–203mm, 231mm shank, 12 spline) is for larger diameter holes. HM5C (Φ140–178mm, 231mm shank, 8 spline) offers 8-spline compatibility for specific hammer models.

Q6: What button types are available in the Mission Series?

The Mission Series features spherical, ballistic, and ball + bullet button combinations. Spherical buttons provide superior wear resistance for harder rock, ballistic buttons offer enhanced cutting action, and ball + bullet combinations provide balanced performance for variable conditions.

Q7: What face designs are available and when should I use each?

Three face designs are available: Convex (ideal for medium-hard rock), Flat (suitable for harder rock and abrasive conditions), and Concave (designed for deep hole drilling and superior hole cleaning).

Q8: Does the Mission Series perform well with unstable air pressure?

Yes. The Mission Series design is specifically engineered to perform exceptionally well under variable air pressure conditions, making it ideal for operations where compressor output may fluctuate.