"Which hammer should we use here-BR2 or BR3?"
This is a common question at job sites where drilling contractors face medium-hard formations. Middle Pressure DTH Hammers-specifically the BR2 and BR3 models-are engineered for stable performance under 8–15 bar, making them the industry's primary choice for medium-pressure applications. From quarry bench drilling to small mining operations, these hammers deliver reliable penetration at a competitive operating cost.
What Are Middle Pressure DTH Hammers?
Middle Pressure DTH Hammers refer to down-the-hole tools operating in the 8–15 bar air pressure range. In the global market, BR2 and BR3 are the only widely recognized and standardized medium-pressure hammer series, designed for light and medium drilling rigs commonly used in:
- Quarry bench blasting
- Small–medium mining applications
- Construction and municipal engineering
- Water well pilot holes
- Road infrastructure drilling
These hammers bridge the gap between low-pressure systems and high-pressure units, offering balanced power, fuel efficiency, and easy maintenance.
Key Features
Optimized for 8–15 Bar Working Pressure
The BR series uses a medium-length piston stroke to generate stable impact energy even at lower air volumes. Benefits include:
- Consistent drilling in fractured or mixed formations
- Lower air consumption than high-pressure hammers
- Reduced fuel cost for compressor systems
2. Compatible with Widely Used Shank Types
The Middle Pressure DTH Hammers are designed for:
BR2 shank bits (typically 64–82 mm drilling)
BR3 shank bits (typically 85–102 mm drilling)
This makes the series versatile across common blast-hole and construction requirements.
3. Durable Alloy-Steel Body
Both Middle Pressure DTH Hammers are produced using:
- High-strength heat-treated alloy steel
- Carburized and quenched splines
- Precision-machined piston chambers
This ensures long life, better energy transfer, and reduced wear.
Proven Reliability in Global Markets
BR2 / BR3 hammers are widely used in:
- Europe
- South America
- Middle East
- Southeast Asia
Their structure is simple, proven, and widely accepted among drilling contractors.
Technical Specifications
| Item | BR2 Middle Pressure DTH Hammer | BR3 Middle Pressure DTH Hammer |
|---|---|---|
| Working Pressure Range | 8–15 bar | 8–15 bar |
| Recommended Bit Size | 3" series, typically Ø 76–90 mm | 3.5" series, typically Ø 90–105 mm |
| Hammer Outside Diameter | approx. 76 mm | approx. 84 mm |
| Weight | approx. 18–20 kg | approx. 23–25 kg |
| Air Consumption | Lower; suitable for small/medium compressors | Medium; needs slightly higher air volume |
| Impact Power | Medium, ideal for standard rock formations | Higher, ideal for harder and denser rock |
| Connection Type | Standard BR2 back-end connection (API or customized) | Standard BR3 back-end connection (API or customized) |
| Foot Valve Structure | Without Foot Valve | Without Foot Valve |
| Suitable Drill Rig Type | Small crawler rigs, civil water wells, small mining | Medium crawler rigs, foundation drilling, water wells |
| Typical Applications | Domestic water wells, small mining, geotechnical drilling | Foundation engineering, water wells, hard rock drilling |
| Cost Performance | Lower cost, easy maintenance | Higher efficiency with slightly higher cost |
| Recommended Air Compressor Output | 2.5–4.5 m³/min | 4–6 m³/min |
| Suitable Drill Rod Diameter | 50–60 mm | 60–76 mm |
| Key Advantages | Lightweight, low air consumption, flexible operation | Strong impact power, higher penetration rate |
| Best for | Small and medium drilling contractors | Professional foundation & water well contractors |
Product Advantages
1. Lower Fuel Cost vs High-Pressure Systems
Since BR2/BR3 operate at medium air pressure, contractors can use:
- Smaller compressors
- Lower diesel usage
- Reduced maintenance consumption
This makes drilling more economical for small and medium projects.
2. Smooth Drilling in Medium-Hard Formations
BR hammers provide excellent performance in:
- Basalt
- Limestone
- Conglomerate
- Sandstone
- Weathered rock
Their stable impact frequency reduces bit wear and deviation.
3. Easy to Service Design
The internal components of BR hammers are fewer and simple:
- Quick disassembly
- Fast cleaning
- Easy replacement of piston and wear rings
Downtime is minimized for contractors working under tight schedules.
Application Scenarios
Quarry Bench Drilling
Middle Pressure DTH Hammers are widely used for bench blasting holes due to their low cost per meter.
Mining & Small Exploration Work
Suitable for small mines requiring economical drilling solutions.
Urban Foundation Projects
Medium pressure hammers cause less vibration, suitable for city construction.
Water Well Pilot Drilling
Used as pre-hole drilling tools before casing installation.
Road Subgrade and Slope Stabilization
Ideal for anchors, bolts, and shotcrete preparation.
FAQ
Q1: What compressor should I use for BR2/BR3?
A: Any medium-pressure compressor in the 8–15 bar range is suitable.
Q2: Can BR hammers drill hard rock?
A: They perform well in medium-hard formations.
For very hard rock, high-pressure DTH hammers may be more effective.
Q3: What bit types are compatible?
A: Only BR2 shank bits (for BR2) and BR3 shank bits (for BR3).
Q4: What is the recommended maintenance interval?
A: Check internal wear every 300–500 meters depending on drilling hardness.
