Big Hole DTH Hammer for Well Drilling

Big Hole DTH Hammer is used for wells , oil, gas and construction drilling. It is suit for the Hole Range about 300mm to 800mm....

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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”. 

A rotation drill rig, air compressor and the “DTH drill string” are the essential unit for DTH drilling while the “DTH drill string” is always made up of DTH drill rods, DTH hammer and DTH bits. As one of key component, the DTH hammer acts as a role of converting the air pressure to the impact energy, simultaneously transferring impact energy and rotation force to DTH bits. 

Our DTH hammers are all 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).   


Bit Shank: GD330, GD450, GD525

Hole Range: φ350mm-800mm


Big Hole DTH Hammer


Two Types DTH Hammer

INCHBit ShankConnection ThreadExternal DiameterBit DiameterLength (without bit)Working PressureRecommended Rotation Speed 

Code No.
15GMD330API 7 5/8"REG 330350-660387010501-2.515-25
18GMD450According to your request450550-700219514501-2.515-25
24GMD525According to your request525610-800265028951-2.515-25

Big Hole Size DTH Hammer-1

Big Hole Size DTH Hammer-2


Big Hole DTH Hammer for Well Drilling


 Big Size DTH Hammer

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Big Hole  DTH Hammer and Bit

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

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



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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