was established in 1997. It is a privately owned and proudly company. We have grown to become a leading manufacturer of tricone bit and supplier of high quality drilling tools & equipment, and we excel in designing, manufacturing, and distributing construction industry drilling tools as well as finding custom solutions to complex problems. Our goal is to provide our customers with the best quality tools, accessories and service in the industry. We are supported by many years of experience, trained professionals and a full machine shop.

Hejian Zhongcheng Bit Manufacturering Co.LTD, our brand " SRF" maintains a strong reputation in the construction, exploration, water well, geothermal, mining, and oil & gas industries as a company that can provide dependability and high quality products at excellent value.

" SRF" includes: Tricone bit( steel tooth & TCI bit),PDC drill bit (marix & steel body),step drag bit,HDD Reamer bit (Hole opener),Stabilier,Drill pipe,drill rod,Rock Auger,……

Our broad spectrum of customers allows us to offer a dynamic range of products and solutions, you can trust us to meet your industry"s demands. From working with drilling tool designers, custom part design, drafting, implementation to machining fabrication, assembly and distribution, we are ready to meet any of your industry"s drilling challenges. At " ZHONGCHENG" we feel it is important to work closely with both our customers and suppliers to develop a relationship based on trust and cooperation.

Our company"s machine shop uses state of the art CNC's to manufacture parts to extremely high precision and accuracy. We constantly acquire and stock quality raw materials to reduce lead times on our products, and work closely with our customers to continuously improve their products in an effort to reduce their cost per foot when drilling.

" Hejian Zhongcheng Bit Manufacturering Co.LTD. (SRF)" has a large machine shop with numerous high quality CNC Lathes and Mills including a 4 Axis 26" Diameter Spindle Bore Lathe. We have a large welding area, and commonly preform ARC, MIG, TIG and pressure welding applications. So if you have any request for the Drill bits,drilling tools,please Call us or send inquiry to US at any time.

 Drill bit introduce
1. Drill bit cutting structure
Adopting new formula of new technology of the high quality hard alloy tooth, enhance the cutting teeth mechanical properties.

2. Drill bit diameter structure
Using multiple gage protection structure: Die with multidrug trimming tooth (GT teeth), round back, claw back set have cemented carbide gear, surfacing resistance mo alloy, strengthen ZhaoJian and anterior apply welding, greatly improving the drill gage protection ability.

3. Drill bit bearing structure
Adopting high precision with radial sliding, two way thrust bearings, ball tight. Tooth claw big shaft neck and two stop surface welding have wear-resisting alloy, cone big hole and two stop surface solution and silver inlaid special alloy, increase the abrasion resistance and resistance bearing vice occlusive ability, improve bearing ability of high speed vice adapt.

4. Drill bit seal lubricants
Adopting advanced metal seal, greatly extend the drill life.

5. Drill bit applicable
Metal seal bit stable performance, than common rubber seal bit longer life, suitable for underground power drill and high penetration rate turntable drilling.