High Air Pressure DTH Hammer with Foot Valve

The “DTH” is the abbreviation of “Down The Hole” and sometimes it is also called “RAB” in some markets, and the “RAB” is short for “Rotary Air Blasting”....

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Our High Air Pressure DTH Hammer is simple structure, easy to assemble and disassemble, as well as reliable quality and long service life. GMD has various hammer models suitable to drill holes from 64mm to 1000 mm (2-1/2” ~ 39-3/8”) in diameter; and come with three kind: low pressure (5 ~ 7 bars), middle pressure (7 ~ 15 bar) and high pressure ­­(7~ 30 bars).    

There are two different types High Air DTH Hammer: DTH Hammer with Foot valve and DTH Hammer without Foot Valve, details, kindly check below:


Our DTH Hammer has below advantages:

● Deliver maximum energy to drilling bit, fast drilling speed and low air consumption.

● Smooth performance and long service life due to high quality alloy steel materials and advanced processing technology adapted.

● Low problem rate and easy to maintenance because of simple , reliable and easy assemble and disassemble inner structure of hammer.

● Easy to depart bit from hammer based on the multi-head thread connecting chuck and cylinder of hammer.

● Interchangeable with DTH bit and dill pipe manufactured by Atlas copco and Ingersoll-rand.


High Air Pressure DTH Hammer (with foot valve) Technical Data
DTH hammer typeDHD35DHD340DHD350DHD360DHD380DHD1120
Bit shankDHD3.5COP44   DHD340COP54 DHD350RCOP64   DHD360COP84    DHD380DHD1120
Hole range(mm)Φ90-110Φ110-135Φ135-155Φ155-190Φ195-254Φ305-445
Connection threadAPI 2 3/8” Reg.API 2 3/8"RegAPI 2 3/8"RegAPI 3 1/2"RegAPI 4 1/2"RegAPI 6 5/8"Reg

API 3 1/2"Reg

Working pressure1.0-1.5Mpa1.0-2.5Mpa1.0-2.5Mpa1.0-2.5Mpa1.0-2.5Mpa1.0-2.5Mpa
DTH hammer typeQL40QL50QL60QL80

Bit shankQL40QL50QL60QL80

Hole range(mm)Φ110-135Φ135-155Φ155-190Φ195-254

Connection threadAPI 2 3/8"RegAPI 3 1/2"RegAPI 3 1/2"RegAPI 4 1/2"Reg

Working pressure1.0-2.5Mpa1.0-2.5Mpa1.0-2.5Mpa1.0-2.5Mpa

DTH hammer typeSD4SD5SD6SD8SD10SD12
Bit shankSD4SD5SD6SD8SD10SD12
Hole range(mm)Φ110-135Φ135-155Φ155-190Φ195-254Φ254-311Φ305-445
Connection threadAPI 2 3/8"RegAPI 3 1/2"RegAPI 3 1/2"RegAPI 4 1/2"RegAPI 4 1/2"Reg    API 6 5/8"Reg

API 6 5/8"Reg
Working pressure1.0-2.5Mpa1.0-2.5Mpa1.0-2.5Mpa1.0-2.5Mpa1.0-2.5Mpa1.0-2.5Mpa
DTH hammer typeNUMA100NUMA120NUMA125

Bit shankNUMA100NUMA120NUMA125

Hole range(mm)Φ254-311Φ305-445Φ305-445

Connection threadAPI 6 5/8"RegAPI 6 5/8"RegAPI 6 5/8"Reg

Working pressure1.0-2.5Mpa1.0-2.5Mpa1.0-2.5Mpa

N---DTH Hammer- 12

DTH Hammer & Bit

High Air Pressure DTH Hammer Available For the Bit With Foot Valve

It has the following characteristics: 

1, Valveless air distribution. More reliable.  '

2, Simple design of the piston, long life.

3, More efficient energy transfer, faster drilling speed, lower air consumption and lower oil consumption. 

4, Fewer internal parts, simple structure, longer 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 by multi- step thread.

High Air Pressure DTH Hammer-2


DTH Bit With Foot Valve

DTH Bit With Foot Valve

High Air Pressure DTH Hammer Available For the Bit With Foot Valve

DTH Hammer With Foot Valve




Packing Picture




The information you may like to know before order:

1. Q:Methods of Payment:

   A: T/T (Telegraphic Transfer) or Western Union or L/C at sight

2. Q: Handling time for an order

   A: Generally it is 5-10 days if the goods are in stock. or it is 15-20 days if the goods are not in stock, it is according to quantity.

3. Q: Shipping way

   A: Sample order: we suggest Courier express like DHL/UPS/TNT/FEDEX or by air

     Bulk order: we suggest by air or by sea.

4. Q: Quality Control

   A: We have our own experienced QC.

  There will be strict inspection and testing for every order before shipping out.

5. Q: After Services:

   A: (1). Our sales team will response for your question within 24 hours (Holidays Excluded)

  (2). Technical Support will be available in any time

  (3). Free replacement will provide once the failure confirmed caused by our product quality


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DTH Hammer for Water Wells, Oil, Gas and Construction Drilling

High Air Pressure DTH Hammer Available For the Bit With Foot Valve

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