Hunan New Diamond Construction Machinery Co., Ltd.
Hunan New Diamond Construction Machinery Co., Ltd.

Hunan New Diamond Construction Machinery Co., Ltd.

Home ProductsCasing Drilling System

High Performance Casing Drilling System For Mines / Quarries Alkali Resistance

High Performance Casing Drilling System For Mines / Quarries Alkali Resistance

  • High Performance Casing Drilling System For Mines / Quarries Alkali Resistance
High Performance Casing Drilling System For Mines / Quarries Alkali Resistance
Product Details:
Place of Origin: Hunan, China (Mainland)
Brand Name: New Diamond
Certification: ISO9001:2008
Model Number: NSOD
Payment & Shipping Terms:
Minimum Order Quantity: Negotiable
Price: Negotiable
Packaging Details: Carton packaging and wooden box packing
Delivery Time: 5-8 work days
Payment Terms: L/C, T/T, Western Union
Supply Ability: According to order quantity
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Detailed Product Description
Type: Symmetric Overburden Drilling Equipment Machine Type: Drilling Equipment
Certification: API Material: Carbon Steel, High Quality Alloy Steel
Processing Type: Forging Use: Mining
High Light:

concentric drilling system


dth drilling system




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.


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.




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 model Casing OD(mm) Casing wall max (mm) Ring bit OD(mm)

Ring bit OD


Pilot bte OD(mm) hammer
NSOD114 114.3 6/10 91/78 128/124 100/92.5 ND35
NSOD127 126.7 7 99 140 110 ND35
NSOD140 139.7 7/10 116/94 154/150 124/117.5 ND45/NQL4
NSOD168 168.3 8/12.7 142/121 182/178 150/140 ND55/NQL5
NSOD178 178.3 10 145 195 156 ND55/NQL5
NSOD194 193.7 6/12.7 167/148 212/203 180/167 ND65/NQL6
NSOD219 219.1 7/12.7 186/167 234 203/191 ND65/NQL6
NSOD273 273.0 8/12.7 232/219 292 255/246 ND85/NQL8
NSOD325 323.9 8/12.7 281/270 342/342 306/297 ND85/NQL8
NSOD406 406.4 12.7 328 419 374 NSD10/N125
NSOD508 508.0 15 412 526 470 ND475/SD15
NSOD609 609.6 15 513 637 570 ND525/SD18


Feature Advantage

1. price commitment: in order to ensure the high reliability of products, high-quality brand products are selected for raw material selection. Under the same competitive conditions, no more products will be provided to customers at a favorable price, based on the reduction of the technical performance of products.

2. Quality commitment: product manufacturing and testing have quality records and inspection data; the performance of the product can withstand customer inspection.


3. Customer service: in order to create new diamond brand, enhance the visibility of enterprises,establish corporate image, we serve customers with the principle of "preferential prices, good service, reliable product quality"principle.


Contact Details
Hunan New Diamond Construction Machinery Co., Ltd.

Contact Person: Rick.liao

Tel: +8618692219720

Send your inquiry directly to us
Hunan New Diamond Construction Machinery Co., Ltd.
PinJiang Industry Park,PingJiang county,YueYang City,Hunan,China.
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