Concentric Symmetric Casing System

Concentric Symmetric Casing System Drill Bits For 194 Mm Casing Tube

Material	Carbon steel
Application	water well drilling
Advantage	Good quality and lower price.
Color	Green, Gold, Black or based on customer requirements.
Certification	ISO

Product Description

The symmetric/Concentric drilling system is designed to drill and case a hole simultaneously through unstable ground conditions. The driver bit incorporated with a satisficial ring or reusable ring makes a full face head design which significantly improves the penetration rate and hole straightness of drilling. The internal flushing grooves together with the built-in casing shoes gives a good seal to the button of the drilling hole, and thus minimizing the disruption of the surrounding of the drill hole.

Application Range:

It is suitable for drilling water wells , geothermal wells , short miscopies ,medium mini-type grouting hole of building , dam and harbor project .

Ring bit and casing shoe assembly is welded to casing prior to drilling. Lock the assembly into pilot bit with hammer. The pilot bit’s upper shoulder engages the shoulder of the casing shoe.
Hammer’s percussive energy is transferred through the pilot and ring bits, crushing rock . Part of impact energy advances casing.
On completion of drilling and casing , the drill string with pilot bit is retrieved by a slight reverse rotation to unlock the bayonet coupling . The ring bit stays in the hole , and can be recovered only if the casing is retrieved
Drilling continues to the desired depth in the bedrock using a conventional drilling.

Model	(mm) Casing Tube O.D	D(mm)Bit Diameter ( Button Included)	(mm) Casing Shoe I.D.	(mm) Maximum Reaming 0.D.	Hammer Style
146Concentric Casing	φ146	φ123.5	φ116	φ156	4″
168Concentric Casing	φ168	φ146	φ140	φ184	5″
178Concentric Casing	φ178	φ157	φ150	φ194	5″
183Concentric Casing	φ183	φ160	φ152	φ198	5″
194Concentric Casing	φ194	φ178	φ164	φ208	6″
219Concentric Casing	φ219	φ203	φ192	φ234	6~7″
245Concentric Casing	φ245	φ217	φ205	φ260	6~8″
273Concentric Casing	φ273	φ246	φ233	φ291	8″
325Concentric Casing	φ325	φ297	φ282	φ340	8~10″
377Concentric Casing	φ377	φ351	φ332	φ405	10~12″

Competitive Advantage

Very competitive price
Professinal service team and special after sale team
Fast response about all questions from clients
Design based on your specific requirements
Delivery on time

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Frequently Asked Questions

Q：Are you manufacturery or trade company?

A:We are manufacturer, has more than 10 years of professional production experience .Products including DTH Hammer and Bit、Drill Pipe Casing System、Tricone Bit、Top Hammer Drill Rod、 Drill Bit、Tapper Button Bit and Rod、 Integral Drill Rod etc.

Q: Do you offer warranty on your products?

A: Yes. For different products we offer different warranty that cover all manufacturing defects in materials and workmanship. The longest period of warranty is 6 months after shipping date.

Q: How is your quality control?

A: We have our own experienced quality control. There will be strict inspection and testing for every order before shipping out.

Q: How long is your delivery time?

A: 1-5days for the products in stock； regular order delivery in 2-3weeks.

Q: After Services

A:(1) Our sales team will response for your question within 24 hours (Holidays included).

(2) Technical Support will be available in any time.

(3)Free replacement will provide once the failure confirmed caused by our product quality.

Q:Methods of Payment

A:We offer different payment terms, including T/T, D/A, D/P, L/C and O/A, etc. You can choose your preferred payment methods before we shipping the goods.

Q: Do you offer OEM service?

A:Yes, we can offer OEM service if you have regular requirement.

Q: Where did you export ?

A:Till 2022 we have exported to 50+ countries.