Note: Always contact your supplier to determine if the coronavirus (COVID-19) will affect your order.

Eccentric overburden Odex-178-146mm drilling pilot bit for 5inch dhd350 DTH hammer

1 Piece
>=2 Pieces
Min. Order
1 Piece
Choose your specifications
Company Information

Qingdao Worldrill Co., Ltd.

CN Manufacturer, Trading Company
Response Time
Response Rate:
US$ 100,000+
4 Years Paid Supplier Gold Supplier Onsite Check Trade Assurance
Learn More

Quick Details

Applicable Industries: Construction works ,Energy & Mining
Place of Origin: CHINA
Type: Drill Bit
Machine Type: Drilling Equipment
Certification: ISO9001
Material: Carbide
Processing Type: Forging
Use: Well Drilling
Product name: PILOT BIT
Application: Guide reaming
Color: Green
Size: 5 inch
Advantage: Long Service Life
outer Diameter: 178mm
Item: Mining Rock Drill Tool Bit
Quality: Excellent
Thread: API 3 1/2" Reg
Reamed Dia: 195mm
Selling Units: Single item
Single package size: 40X20X20 cm
Single gross weight: 80 KG
Package Type: wood-box
Package Preview:
Working principle

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 caerfully,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 botton 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 drilling.
Product Parameters
Outer Dia.(mm)
Inner Dia.(mm)
The Max.Wall Thickness
Reamed Dia.(mm)
Inner Dia.of Casing Shoe That Pilot Bit Can Pass Through
Inner Dia.of Casing shoe
Hammer Type
Drill Pipe (mm)
DHD350   QL50
Product Details Show
Why Choose Us

About us

.WORLDRILL® DTH drilling tools including DTH hammers and bits are widely used in a variety of application formations in more than 50 countries in the world.

Equipment & technology

Our hammer and bits are made of high quality alloy steel with advanced heat treatment to assure the good drilling performance and long service life. They are widely used by our customers all over the world.


 " I am so impressive with WORLDRILL and thanks for their good service and understanding "
            --- Alexander from South Africa
" I have found the best provider"
                      --- From an Indian Partner

Product Processing

Q1: Can I have a sample for testing?
A:Samples are still to be paid but discounted price can be provided.

Q2: Do you have the inspection procedures?
A:100% strict inspection and testing for every order before packing.

Q3: How can i get the after sale services?
A:Free replacement will provide once the problems casued by our product quality.

Q4: Can I have a visit to your factory before the order?
A: Sure, welcome.

Main Products


For drilling solutions or custom manufacture, please contact WORLDRILL now to find out what more we can do for you: