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High Strength Symmetrix Overburden Drilling System Stable Working Performance

High Strength Symmetrix Overburden Drilling System Stable Working Performance

High Strength Symmetrix Overburden Drilling System Stable Working Performance

Product Details:

Place of Origin: Hunan, China (Mainland)
Brand Name: teamwhole
Certification: ISO9001
Model Number: Concentric Casing System with blocks

Payment & Shipping Terms:

Minimum Order Quantity: 1
Price: Negotiation
Packaging Details: Inner package with cartons,outer package with wooden cases
Delivery Time: 15 work days
Payment Terms: L/C, T/T
Supply Ability: 300 Set
Detailed Product Description
Machine Type:: Drilling Tool Material:: Carbide
Processing Type:: Casting Use: Coal / Ore / Well Mining
Condition:: New Rock Drilling Tool:: Concentric Overburden Casing System

Teamwhole Overburden Concentric Casing System With Two Blocks



General Introduction


Application Range

It is recommended to drill in rock formation where contains some ovals and fractures.


Design Principles

Make the casing follow easy and the equipment and operation simple


Outstanding Advantages

1. The stable and reliable working performance and the less vibration of drill rig.

2. Flexible to open and close.


Operation Procedure

1. when the drilling starts, the blocks slides down through the grooves on pilot bit,and reams to drive the casing shoes and tubes into the hole.

2. When finished the drilling in overburden rock formations, raise the drilling tools and the blocks will get closed through the grooves , and the drilling tools can be pulled out from the hole.

3. Next construction can be followed.


Raw Material



first class special alloy steel with high strength, heat resistance and wearable

The best tungsten carbides from China are commonly applied.
Tungsten carbide from European is also available.




1. Face: Flat,Convex,Concave,Drop-center.
2. Carbide Button Shape: Spherical,Semi-ballistic,Ballistic and Two-step


Outer Dia. of

Casing Tube

Inner Dia. of

Casing Tube



Min. Inner Dia. of

Casing Shoe

Hammer Type Drill Pipes
mm mm mm mm   mm
168 149-155 184 140 TH122 76,89
178 159-165 194 150 TH122 76,89
193 173-180 206 164 TH139 89,114
219 199-206 234 182 TH139,TH180 89,114
244 224-231 260 210 TH180,TH220 114
273 251-257 305 240 TH180 114,127
323 301-310 348 284 TH180,TH220 127
406 382-388 440 364 TH220,TH275 127,140
457 433-439 488 413 TH275 127,140
508 484-490 538 464 TH275 140
558 534-540 590 514 TH275,TH398 140
610 586-592 642 566 TH275,TH398 140,168
660 636-642 694 615 TH398 168
711 687-693 745 665 TH398 168
762 738-744 798 716 TH600 168
863 839-845 900 815 TH600 168

Overburden Concentric Casing System With Two Blocks


Quality Warranty


Our company response for any quality problem caused by material or machining defect.




Excellent for water well drilling, geothermal hole, hole blasting and etc.


Our Service


Teamwhole offers the market most comprehensive range of DTH hammers. There are hammer solutions for water well drillers, miners and quarry drillers as well as for contractors in construction, oil and gas. Teamwhole's DTH hammers are available in holes sizes from 3.5 to 48 inches in diameter.

Teamwhole's flexible and stable ODEX system wins great reputation in users. Reliable quality,innovative design and professional service ensure the fulfill of many projects.

We even offer reverse circulating RC hammers for exploration. We are the earliest in China for RC since 2004. Now the RC hammer and bits are delivered to Australia,South Africa,Russia and Mongolia in large scales.

More than 30 experts supports the technology and enhance the development.




Northern Europe: foundation, piling

Western Europe: water well and geothermal drilling

Russia: Oil, infrastructure and mining.

South east asia: mining and geothermal

South Africa: mining and water well drilling

Middle east: water well drilling

Oceania: mining, exploration and water well drilling

South America: water well drilling and mining


High Strength Symmetrix Overburden Drilling System Stable Working Performance


Contact Details
Changsha Tianhe Drilling Tools and Machinery Co.,Ltd.

Contact Person: Ms.chen

Send your inquiry directly to us (0 / 3000)