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Hunan New Diamond Construction Machinery Co., Ltd.
Hunan New Diamond Construction Machinery Co., Ltd.
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Yellow Concentric Drilling System High Wear Resistance For Mines / Quarries

Hunan New Diamond Construction Machinery Co., Ltd.
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Yellow Concentric Drilling System High Wear Resistance For Mines / Quarries

Brand Name : New Diamond
Model Number : NSOD
Certification : API
Place of Origin : Hunan, China (Mainland)
MOQ : Negotiable
Price : Negotiable
Payment Terms : L/C, T/T, Western Union
Supply Ability : According to order quantity
Delivery Time : 5-8 work days
Packaging Details : Carton packaging and wooden box packing
Type : Symmetric Overburden Drilling Equipment
Machine Type : Drilling Equipment
Material : Carbon Steel, High Quality Alloy Steel
Processing Type : Forging
Use : Mining
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NEW DIAMOND Symmetric overburden casing drilling system

Symmetric is a system comprised of an ingeniously simple concentric method of drilling through overburden with casing.

Symmetric can drill straight holes at any angle (including horizontal) and to depths beyond 100 meters. Working together as one efficient drill bit, the components are made up of:
A pilot bit with large internal flushing holes and external flushing grooves.
Symmetrical ring bit (reamer) with internal bayonet coupling
Casing shoe for driving of casing.

The pilot bit is attached to any common DTH hammer shank or top hammer rod thread.

The casing shoe is welded to the casing. The pilot bit and ring bit are locked together by the bayonet coupling. They drill a hole large enough to allow the casing to be pulled into the hole. The pilot bit and ring bit rotate with the drill string while the casing shoe and casing do not rotate. When required depth is reached, the pilot bit is unlocked by a slight reverse rotation of the drill string. The drill string and pilot bit will be retrieved through the casing, the ring bits and casing shoe will be left in the hole for permanent casing system. Also the ring bits and casing can be retrievable through the special design for ring bits and casing shoe. We can manufacture both permanent Symmetric and Retrievable Symmetric system which can meet your comprehensive requirement.

The below size of Symmetric systems which are available, and the special design is upon customer’s requirement:
Symmetric 114, Symmetric 127, Symmetric 140, Symmetric 146, Symmetric 168,
Symmetric 178, Symmetric 195, Symmetric 219, Symmetric 243, Symmetric 273.


Widely used in mines, quarries, earthworks and other engineering drilling blasting hole, guardrail hole, mountain reinforcement, anchorage and other engineering holes,geothermal exploration hole, Well bore and other fields.


Product modelCasing OD(mm)Casing wall max (mm)Ring bit OD(mm)

Ring bit OD


Pilot bte OD(mm)hammer

Product Tags:

dth drilling system


ring bit drilling system

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