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High Pressure Rock Drilling DTH Hammer DHD350 Hammer , Downhole Hammer with Foot Valve

1 set
High Pressure Rock Drilling DTH Hammer DHD350 Hammer , Downhole Hammer with Foot Valve
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Model: DHD350 Down The Hole Hammer, DTH Hammer
Delivery Time: Stocks Is Available
Material: Tungsten Carbide
Usage: Water Well Drilling, Mining Drilling
Processing: Forging
Tools: Down The Hole Drilling
Machine: Crawler Drill Rig
Thread: API Reg. Pin, Box
Hole Range: 90-1200mm
Pressure: High Pressure
Use: Quarry Drilling, Blast Hole Drilling
High Light:

dth drilling tools


down hole tools

Basic Infomation
Place of Origin: CHINA
Brand Name: ROSCHEN
Certification: ISO
Model Number: DHD350
Payment & Shipping Terms
Packaging Details: Poly wooden box
Supply Ability: 10000 sets
Product Description

High Pressure Rock Drilling DTH Hammer , Downhole Hammer with Foot Valve

High Pressure Rock Drilling DTH Hammer DHD350 hammer, Downhole Hammer with Foot Valve



High Pressure Rock Drilling DTH Hammer , Downhole Hammer with Foot Valve

5 inch COP54 , DHD350R Shank High pressure rock drilling DTH hammer with foot valve


Drill bits

Selecting the right bit

Roschen has a comprehensive range of DTH drill bits to match all conceivable applications.

Each bit is made from quality alloy steel, and has been precision machined to produce a perfect body, heat treated to the required hardness, given surface compression for fatigue resistance, and fitted with precision buttons manufactured in-house. 

Five basic designs are available: Convex, Flat front, Speed Bit, Concave, and Rocket bit. These are designed for specific applications for all rock types, hardness's and conditions Bit life and rate of penetration are the most important criteria in selecting the right bit for a particular application.

In most cases, the focus is on productivity, so the fast cuttings removal features of the SpeedBit and Convex/Ballistic designs are preferable, to ensure the buttons are cutting clean, with the minimum of recrushing.

In hard and abrasive formations, however, the flat front design offers best bit life, having strong gauge rows with large spherical buttons which are easy to regrind and maintain. The Speed Bit offers improved productivity with the same gauge as the Flat front, but with ballistic buttons in the front for faster penetration. An alternative is the Concave design with spherical buttons.

The Rocket bit can be dressed with ballistic buttons for use in soft to medium hard formations where fractured rock can be expected, or can be supplied with spherical buttons for hard and abrasive formations.
Bits are manufactured to match all diameters of Secoroc hammers.

It is a kind of valveless high air pressure DTH hammer with foot valve.

The rock hammer has the fellow advantages:

1: Valveless air distribution. more reliable.
2. The rock impacter are simple design of the piston, long life.
3. More efficient energy transfter,faster drilling speed, lower air consumption and lower oil consumption.
4. Fewer internal parts, simple structure, long life, less failure and easier to maintain because all the parts are heat treated.

5. Easy to disassemble because the top sub, the drive chuck and the external cylinder are connected multi-step thread.

Hammer shank available:

1. BR shank series: BR1, BR2, BR3;
2. Cop shank series: Cop32, Cop34, Cop44, Cop54, Cop64, Cop84;
3. DHD shank series: DHD3.5, DHD340,DHD350, DHD360, DHD380;
4. SD shank series: SD4, SD5, SD6, SD8, SD10, SD12, SD15, SD18;
5. Mission shank series: Mission40, Mission50, Mission 60, Mission 80;
6. QL shank series: QL30, QL40, QL50, QL60, QL80;
7. NUMA shank series: NUMA120, NUMA125, NUMA180, NUMA240;

Other hammer shanks can be available according to customer's drawing or samples.

Technical Parameters of High air pressure DTH hammer with foot valve



DHD 350 Hammer Parts List
Item Description Weight Parts No.
1.Top Sub 15 RD5501
2.O-Ring of Top Sub 0.01 RD5502
3.Check Valve 1 RD5503
4.Spring 0.04 RD5504
5.Compression Buffer 0.06 RD5505
6.Air Distributor 3.7 RD5506
7.Internal Cylinder 4.5 RD5507
8.Piston 15.5 RD5508
9.External Cylinder 30 RD5509
10.O-Ring of stop ring 0.01 RD5510
11.Stop Ring 0.3 RD5511
12.Drive Chuck 6.4 RD5512
13.Drill Bit 16 RD5513


According to customer's requirement, the top sub can be made into two spanners, and put protection buttons, An air controllinghole can be drilled on the check valve to provide more efficient cuttings discharge. 


Technical Parameters
Length (Less bit) Weight (Less bit) External Dia. Bit Shank Hole Range Connection Thread
1214mm 76.5kg 125mm COP54, DHD350R 135-155mm API 2-3/8''REG
API 3-1/2''REG
Working Pressure Impact rate at 0.5 Mpa Recommended Rotation Speed Air Consumption
1.2-2.5Mpa 25HZ 20-35r/min 1.0Mpa 1.8Mpa 2.4Mpa
9m3/min 15m3/min 23m3/min


Any more technical question of this DTH Hammer&Bits please feel free contact with our DTH drilling Tools department. 

ROSCHEN DTH Hammers Specifications
Hammer Size Bit Shank ROSCHEN Code Connection Thread Suitable bit Working pressure Air consumption
2" BR2 ROS 11
ROS 22
RD50 box ¢70-¢90mm 0.7-1.75Mpa 0.7Mpa 4.5m3/min
1.0Mpa 4m3/min
1.4Mpa 5m3/min
3" DHD3.5 ROS 32 API 2 3/8" Reg ¢90-¢110mm 1.0-1.5Mpa 1.0Mpa 4.5m3/min
M30 1.5Mpa 9m3/min
4" DHD340 ROS 34 API 2 3/8" Reg ¢110-¢135mm 1.0-2.5Mpa 1.0Mpa 6m3/min
SD4 1.8Mpa 10m3/min
M40 2.4Mpa 15m3/min
5" DHD350 ROS 52 ROS 54 API 2 3/8"Reg/API 3 1/2" Reg ¢135-¢155mm 1.0-2.5Mpa 1.0Mpa 9m3/min
SD5 1.8Mpa 15m3/min
M50 2.4Mpa 23m3/min
6" DHD360 ROS 62 ROS 64 API 3 1/2" Reg ¢155-¢190mm 1.0-2.5Mpa 1.0Mpa 10m3/min
SD6 1.8Mpa 20m3/min
M60 2.4Mpa 28.5m3/min
8" DHD380 ROS 82 ROS 84 API 4 1/2" Reg ¢195-¢254mm 1.0-2.5Mpa 1.0Mpa 15m3/min
QL80 1.8Mpa 26m3/min
SD8 2.4Mpa 34m3/min
10" SD10 ROS 100 API 6 5/8" Reg ¢254-¢311mm 1.0-2.5Mpa 1.0Mpa 22m3/min
Numa100 1.8Mpa 40m3/min
ROS 100 2.4Mpa 55m3/min
12" DHD1120 ROS 120 API 6 5/8" Reg ¢305-¢445mm 1.0-2.5Mpa 1.0Mpa 30m3/min
SD12 1.8Mpa 56m3/min
Numa120 2.4Mpa 78m3/min
Notes: Any special size of DTH bits will be available by requests.
Metzke, Remet thread is available!



The information about dth drill bit you may like to know before order:

1. Methods of Payment:
T/T (Telegraphic Transfer) or Western Union or L/C at sight

2. Handling time for an order
Based on order quantity, normally it takes 20 days for production.
in 3 working days after receiving the advance payment

3. Shipping way
Sample order: we suggest Courier express like DHL/UPS/TNT/FEDEX or by air
Bulk order: we suggest by air or by sea.

4. Quality Control
We have our own experienced QC.
There will be strict inspection and testing for every order before shipping out.

5. After Services:
a. Our sales team will response for your question within 24 hours (Holidays Excluded)
b. Technical Support will be available in any time

6. Quality & Service:
A. There will be strict inspection and testing for every order before shipping out.
B. Our sales team and Technical Support will response for your question within 24 hours through skype: ROSCHEN.TOOL and WhatsApp/Wechat: +86-13764195009
C. Free replacement will provide once the failure confirmed caused or our product quality.

For more information please contact:




WeChat: +86-137 6419 5009 ; +86-135 8585 5390

WhatsApp: +86-137 6419 5009 ; +86-135 8585 5390

Email: ;

Website: ; ; ;

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Get in touch with us
Contact Person : Bill, George, Michael
Tel : 8613764195009
Fax : 86-021-54380177
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