High-Penetration, High-Energy Down-the-Hole Hammers for 1.0–3.3 MPa Drilling Conditions
High pressure DTH hammers are the essential choice for deep-hole drilling, fast penetration, and hard rock formations where powerful impact energy is required. The Dminingwell DHD340, DHD350, DHD360, and DHD380 are engineered for demanding projects such as mining, quarrying, water wells, construction piling, and geothermal development.
For users who want to understand how a High Pressure system differs from standard DTH configurations, our guide What Is a DTH Hammer and How It Works? is a great place to start.
Product Overview
The DHD series is globally recognized for its stable structure, powerful impact, and long maintenance intervals.
Model overview:
DHD340 - Medium-large hole drilling (110–135 mm)
DHD350 - Larger hole drilling (135–155 mm)
DHD360 - Heavy-duty large hole drilling (150–190 mm)
DHD380 - Ultra-large hole drilling (195–254 mm)
These hammers deliver excellent energy transfer with optimal airflow, making them suitable for deep and hard-rock drilling operations.
Key Features of Dminingwell High Pressure DHD Series
The piston structure has been optimized to achieve maximum striking force, ensuring faster penetration in granite, basalt, and other challenging formations.
Despite being High Pressure models, the internal airflow design minimizes wasted air, improving drilling efficiency and reducing compressor load.
All core components are manufactured from high-grade alloy steel, heat-treated for exceptional abrasion resistance.
Ensures universal compatibility with global drilling systems.
High Pressure models maintain stable performance even at 1.0 MPa, but unleash maximum power at 1.8–3.3 MPa.
Applications
DHD High Pressure hammers are suitable for:
Deep water wells
Hard-rock mining
Blast hole drilling
Quarry drilling
Foundation and piling engineering
Hydrogeological and geothermal drilling
For optimizing drilling efficiency, see:
Daily Maintenance Guide for DTH Hammers
Why High Pressure DTH Hammers?
High Pressure designs (1.0–3.3 MPa) allow the hammer to deliver:
Stronger impact force
Higher piston velocity
Faster penetration in hard formations
Better hole quality and straighter drilling
Which air compressor should I use with DHD360 or DHD380?
You need a High Pressure diesel screw air compressor with:
18–34 m³/min flow
1.8–3.3 MPa pressure
See the internal guide:
👉 "How to Select Air Compressors for DTH Hammers"
What bit shank do these models use?
The Dminingwell High Pressure hammers use the following thread connections:
DHD340: API 2 3/8" REG
DHD350: API 2 3/8" REG
DHD360: API 3 1/2" REG
DHD380: API 4 1/2" REG
Compatibility with industry-standard DHD bits is guaranteed.
How often should I service a High Pressure DTH hammer?
Routine service should be done daily or every 300–500 meters, including:
Cleaning internal parts
Checking wear on piston & inner cylinder
Lubricating O-rings
Removing moisture and debris
Inspecting top sub and drive chuck
👉 Internal link (maintenance guide):
/how-to-maintain-dth-hammer
Why choose Dminingwell High Pressure hammers over other brands?
Imported alloy steel
Optimized piston structure
Lower air consumption compared with others
Full set of spare parts available
Compatible with Numa, Atlas Copco, Sandvik, and DHD bits
Factory-direct pricing
Specifications
|
Model |
DHD340 |
DHD350 |
DHD360 |
DHD380 |
|
Length(Lessbit) |
1032 mm |
1209 mm |
1063 mm |
1492 mm |
|
Weight (Lessbit) |
43kg |
78.5kg |
100.5kg |
190 kg |
|
External diameter |
99mm |
125mm |
142mm |
180mm |
|
Hole Range |
φ110-135 mm |
φ135-155 mm |
φ150-190 mm |
φ195-254 mm |
|
Connection Thread |
API2 3/8"REG |
API2 3/8"REG |
API3 1/2"REG |
API4 1/2"REG |
|
WorkingPressure |
1.0-2.2MPa |
1.0-2.5MPa |
1.0-2.5MPa |
1.5-3.3MPa |
|
Recommended rotation speed |
30-60 r/min |
30-60 r/min |
30-60 r/min |
30-60 r/min |
|
Air consumption |
5.5m³/min (1.0MPa) |
9m³/min (1.0MPa) |
20m³/min (1.0MPa) |
26m³/min (1.8MPa) |
|
10m³/min (1.8MPa) |
15m³/min (1.8MPa) |
28m³/min (1.8MPa) |
34m³/min (2.4MPa) |
|
|
Parts |
Weight (kg) |
|||
|
Top sub |
8.8 |
14.7 |
20.3 |
42 |
|
"O" Ring |
0.01 |
0.02 |
0.02 |
0.02 |
|
Check Valve |
0.46 |
1 |
0.8 |
1.3 |
|
Spring |
0.04 |
0.06 |
0.05 |
0.09 |
|
Rubber Buffer |
0.2 |
0.06 |
0.3 |
0.4 |
|
Valve Seat |
2.1 |
4.2 |
5 |
13 |
|
Inner Cylinder |
2.45 |
4.9 |
4 |
9.1 |
|
Piston |
9 |
15.5 |
23.5 |
41.5 |
|
Piston Case |
159 |
30.3 |
37.2 |
62.5 |
|
Retainer Ring |
0.2 |
0.3 |
0.6 |
1.2 |
|
Drive Chuckk |
3.7 |
7.1 |
6 |
18.2 |
|
Adjuster Ring |
/ |
0.1 |
/ |
0.2 |
|
Ring Lock |
/ |
0.2 |
/ |
/ |
|
adjuster Shim |
/ |
/ |
/ |
0.2 |
|
Guided Sleeve |
/ |
/ |
2.5 |
/ |
Performance Advantages
1. Maximum Energy Transfer
High Pressure chambers accelerate the piston to extreme impact speed, improving drilling efficiency in all rock types.
2. Lower Operating Cost per Meter
Fast penetration = less fuel + shorter drilling cycles.
3. Stable Performance in Deep & Complex Formations
Designed for:
solid granite
quartzite
basalt
mixed formations
4. Modular Structure for Easy Service
Only a few components need periodic replacement, lowering maintenance cost.
Conclusion
The Dminingwell DHD340, DHD350, DHD360, and DHD380 are built for powerful, efficient, and reliable drilling under High Pressure conditions. With superior penetration rates, long service life, and compatibility with global drilling systems, they are ideal for mining, construction, and deep-hole drilling operations.
For related solutions, also explore:
👉 "Middle Pressure DTH Hammers "
This forms a complete DTH hammer product system for all drilling conditions.
Shipping&Payment
Every piece of Miningwell equipment and drilling rig undergoes a rigorous load security check to ensure the safety of the cargo in the container.
Our payment methods: credit card, L/C, T/T, Western Union, and we support shipping by air and by sea.
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