Eccentric drilling tool/Eccentric Overburden Drill Bit

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US $950-1,500 / Sets | 1 Set/Sets (Min. Order)
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Quick Details
Place of Origin:
Fujian, China (Mainland)
Brand Name:
Model Number:
Drill Bit
Machine Type:
Drilling Tool, Drilling Equipment
Carbon Steel
Processing Type:
Well Drilling
mining/Quarry/Construction/Water well drilling
Key word:
Drill Bit
Supply Ability
Supply Ability:
5000 Set/Sets per Month
Packaging & Delivery
Packaging Details
Packing details:
Bits: Single carton inside with bubble or covering layer, again with wooden case outside, or as per your request
Hammers: Single wooden case outside but with bubble covering layer inside.

 Eccentric drilling tool/Eccentric Overburden Drill Bit


( 36 years manufacturing experience; Certificate: ISO9001:2008 )

Eccentric overburden drilling tools with casing tube (HOD series): 


Product Description

 Eccentric Reamer System Step-by-step  

1. When drilling starts, the reamer swings out and reams the pilot-hole wide enough for the casing tube to slide down behind the drill bit assembly.  

2. When the required depth is reached, rotation is reversed carefully, whereupon the reamer swings in , allowing the drill bit assembly to be pulled up through the casing.  

3. Casing tubes that are to be left in the drill hole should be sealed at the bottom of the hole by means of cement grout or some other sealing agent. 

4. Drilling continues to the desired depth in the bedrock using a conventional drill string.


Application Range 

This product is made of alloy of high quality and apply for advanced high-frequency welding technology and maturity of heat treatment process, greatly improving the intensity, wear resistance and impact toughness of cutter head, increasingly prolonging the working life, enhancing the drilling efficiency.

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

The stable and reliable working performance and the less vibration of drill rig and flexible to open and close.

Order Guide:  product type.




Type1.Casing tube2.Drill pipe3.Guide sleeve4.DTH hammer5.Casing shoe6.Guide device7.Reamer 8.Pilot bit
HOD90Maximum OD:115mm Minimum ID:102mmconnection thread:API 2 3/8"REG OD:76mm wrech flats:65mmEffective length: 174mmHD35,COP32, IR3.5,QL30L3=90mm,L4=55mm, D3=101mm,D4=93mmL1=35mm,L2=138mm, D1=92mm,D4=100mmD5=91mm,L5=70mm, reaming diameter=123mm, reamer has4*Φ12buttonsD6=90mm,L6=59mm, gauge button=8*Φ12mm, face button:6*Φ10mm
HOD115Maximum OD:142mm Minimum ID:128mmconnection thread:API 2 3/8"REG OD:76mm wrech flats:65mmEffective length: 174mmHD45,COP44, SD4,DHD340A,QL40,HM4L3=76mm,L4=55mm, D3=127.5mm,D4=117mmL1=48mm,L2=136mm, D1=115mm,D4=126mmD5=114mm,L5=89mm, reaming diameter=152mm, reamer has5*Φ14buttonsD6=114mm,L6=67mm, gauge button=8*Φ14mm, face button:6*Φ13mm
HOD140Maximum OD:171mm Minimum ID:155.6mmconnection thread:API 2 3/8"REG OD:89mm wrech flats:65mmEffective length: 205mmHD55,COP54, SD5,DHD350R,QL50L3=90mm,L4=63mm, D3=155.3mm,D4=143mmL1=55mm,L2=160mm, D1=141mm,D4=154mmD5=138mm,L5=69.5mm, reaming diameter=185mm, reamer has7*Φ14buttonsD6=138mm,L6=66.5mm, gauge button=8*Φ16mm, face button:8*Φ14mm
HOD165Maximum OD:195mm Minimum ID:182.6mmconnection thread:API 3 1/2"REG OD:114mm wrech flats:95mmEffective length: 225mmHD65,COP64, SD6,DHD360, QL60L3=95mm,L4=55mm, D3=181.5mm,D4=166mmL1=61.5mm,L2=181.5mm, D1=165mm,D4=178mmD5=164mm,L5=79.5mm, reaming diameter=211mm, reamer has7*Φ14buttonsD6=165mm,L6=82.5mm, gauge button=8*Φ16mm, face button:8*Φ16mm
HOD190Maximum OD:222mm Minimum ID:205mmconnection thread:API 3 1/2"REG OD:114mm wrech flats:95mmEffective length: 285mmHD65,COP64, SD6,DHD360, QL60L3=110mm,L4=70mm, D3=204.5mm,D4=193mmL1=62.5mm,L2=184.5mm,D1=191mm,D4=203mmD5=185.5mm,L5=90.2mm, reaming diameter=237mm, reamer has7*Φ16buttonsD6=190mm,L6=82mm, gauge button=9*Φ18mm, face button:9*Φ16mm
HOD240Maximum OD:273mm Minimum ID:260.4mmconnection thread:API 3 1/2"REG OD:114mm wrech flats:95mmEffective length: 343mmHD85,COP84, SD8,DHD380, QL80L3=110mm,L4=65mm, D3=259mm,D4=241mmL1=70mm,L2=190mm, D1=240mm,D4=256mmD5=238mm,L5=100mm, reaming diameter=308mm, reamer has14*Φ16buttonsD6=240mm,L6=89.5mm, gauge button=12*Φ16mm, face button:18*Φ16mm
HOD280Maximum OD:324mm Minimum ID:305mmconnection thread:API 4 1/2"REG OD:114mm wrech flats:95mmEffective length: 305mmSD10,NUMA100L3=125mm,L4=75mm, D3=304mm,D4=281mmL1=97mm,L2=254mm, D1




Factory and workshop




Products process

Materials: Tungsten carbide and high strength alloy steels. 

Processing: CNC milling and proprietary "hot (thermal) -insertion" processing procedure to insert the buttons as same as internationally well-known brand ,military grade requirements of heat-treatment guarantee durability .

01.Raw materials cutting 


03.Numerical control operation 

04.Through rough finish 

   Turning/spines mining 

05.Heat treatment (8hours) 

06.Button bits fitting 

07.Fine finishing 

08.Quality test; 

09.Finished products 

10.Packing and transportation

In order to quote you the best price, please tell us the details as following:

01.Grade and specification or drawings;

02.Quantity and quality level;

03.Operation environment;

04.Other special requirement. 




Packaging & Shipping

 Packing details can be customized as per your requirement

Timely shipment can be made upon our negotiation





 The information you may like to know before order: 

1. Methods of Payment:

  T/T (Telegraphic Transfer) or Western Union or L/C at sight,,Escrow,Paypal 

2. Handling time for an order

  Based on order quantity, normally it takes 25 days for production.

  Only 2 or 3 days if we have stock on your request size.

3. Shipping way

  Sample order: we suggest Courier express like DHL/UPS/TNT/FEDEX or by air

  Bulk order: we suggest by air or by sea.

4. Quality Control

  We have our own experienced QC.

  There will be strict inspection and testing for every order before shipping out.

5. After Services:

  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 

In order to quote you the best price, please tell us the details as following:

01.Grade and specification or drawings;

02.Quantity and quality level;

03.Operation environment;

04.Other special requirement. 



 About Us:

1. Our factory has been specialized in manufacturing drilling tools and spare parts since 1980.

2. We have advanced technology and equipment.

3. Our technician has more than 36 year’s professional working experience.

4. Rock drilling tools are exported throughout the world. Main market: Brazil, Chile, Colombia, Uruguay, Australia,Ukraine,Russia, ,Norway, Turkey, USA,Canada, Iran, Malaysia, Thailand, India, etc. 

5. We accept OEM manufacturing and produce on your design.







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