Double threading casing drilling core bit
KINGDRILLING Diamond CO., LTD is one of the most professional private enterprise specialized in researching and producing Concentric casing drilling bit, Eccentric drilling system, DTH hammer, down the hole bit, thread drill bits, taper drill bits, Anchor, coal mining tools and so on.
Rock drilling tools factory KINGDRILLING professionally produce double casing drilling systems by down the hole hammer which are designed to drill and case a hole simultaneously through unstable ground conditions.
It can be used in drilling for grouting holes in projects such as cofferdam, foundation and geothermal well and etc.
As water or compressed air for medium, the discharge head make the casing tube and drill rod rotated and penetrate.
Drill Rod Dia. (mm)
Buttons Dia. (mm)
Bore Hole Dia. (mm)
Thread size (mm)
Buttons Dia. (mm)
How to order?
Crown Ring Bits: Casing OD + Bit OD + Thread Size
Inner Bits: Bit Diameter + Thread Size
Tool Joints: Diameter + Length + Thread Size
Outer/Inner Tube: Diameter + Length + Wall Thickness + Thread Size
1. How about the common packing?
A: If there is no special packing demand, we will take it as our normal packing. First in small carton, and then put in the bigger carton together to make sure goods completed.
2. How to check the product are the exact one you want?
A: If possible, please attach one reference picture to avoid any misunderstanding or any links from our website for a better understanding.
A: Sample order: we suggest Courier express delivery such as DHL/UPS/TNT/FEDEX or by air
Bulk order: by air or by sea we suggest.
4.What is the materials?
Steel is TIMKEN, Alloy is from T6 from Element Six.
5.How to choose the suitable Pneumatic DTH hammer?
It is better for you to choose the one which the outside diameter is nearest to the hole diameter. This will reduce the hole collapse, and the hole cleaning is easier.
You must consider about the consumption of compressed air when you use the Pneumatic DTH hammer. Generally speaking, with the raising of the size of hammer, peak performance requires higher compressed gas consumption and lower pressure. In order to make sure each hammer will be used in the proper consumption of compressed air and pressure, please refer to the attachment.
c.Drill rig Capacity:
The larger bit and hammer will need the drilling rig to provide greater torque and promoting force, but do not exceed the maximum load of the drill. As for the other questions about drill ability, please consult your sales representative
6.How to choose the buttons:
Domes/round buttons are usually used as gauge buttons of DTH bits, suitable for very abrasive and very hard formations.
Parabolic buttons are usually used as gauge buttons and front buttons of DTH Bits, suitable for medium abrasive and hard formations.
Ballistic button are usually used as front buttons of DTH bits, suitable for medium abrasive and medium hard formations. They can also be used as gauge buttons if the rock is soft.
7.What is your main products?
A: Our main products are listed as follows: Concentric casing drilling bit, Eccentric drilling system, Casing tube, Casing shoe, drill pipe, DTH hammer, down the hole bit, thread drill bits, taper drill bits, Anchor tools, coal mining bits, and so on.