| After-sales Service: | Yes |
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| Warranty: | 1 Year |
| Manufacturing Process: | Casting |
| Surface Treatment: | Galvanized |
| Operation Pressure: | Atmospheric Pressure |
| Material: | Alloy |
| Samples: |
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| Customization: |
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Audited Supplier Polished rod couplings are designed for connecting polished rod to the top rod of the string. Contrary to rod couplings, polished rod couplings have a female cone that eliminates the coupling twist-off in the course of operation.
Sub-couplings
Sub-couplings have different sizes of box threads in each end and are used for connecting two sizes of sucker rods or a polished rod to a sucker rod string. Sub-couplings may be used on sucker rods or polished rods
Class T and Class SM coupling for sucker rods are manufactured as per API Specification 11B. For the thread cutting, we are using cold form rolled by displacing rather than by removing of material for making the coupling thread. The thread rolling cutting results in a compressive stress at the root of the thread, giving maximum strength to the traditional weak point of cut-thread couplings.
| pin size in | full size/Slim Hole | outside diameter mm | coupling Length inch | Weight per coupling KG |
| 5/8 | FS | 38.1 | 4 | 0.58 |
| SH | 31.75 | 4 | 0.34 | |
| 3/4 | FS | 41.28 | 4 | 0.63 |
| SH | 38.1 | 4 | 0.47 | |
| 7/8 | FS | 46.04 | 4 | 0.77 |
| SH | 41.28 | 4 | 0.52 | |
| 1 | FS | 55.56 | 4 | 1.23 |
| SH | 50.8 | 4 | 0.89 | |
| 1 1/8 | FS | 60.33 | 4 1/2 | 1.48 |
| SH | 57.15 | 4 1/2 | 1.21 |
Dongying Zhao Xin Industry and Trade Co., Ltd. was established in 2001. Our company is located in Dongying city which has the second largest Oilfield (Shengli Oilfield) in China. We are a company, which conducts scientific research, development, manufacture, sale and after sale service, is one enterprise for oilfield tool and equipment manufacturer. We cover an area of more than 9000 square meters which manufacture different oilfield products. Our main products include drilling equipment, oil production equipment, oil well service tools. Such as sucker rod, drill pipe, OCTG products, bridge plug. Currently, our products are already exported to North America, South America, Middle East, Middle Aisa, India and other countries and regions. The warranty period of all our products is 18 months.
We are an I S O 9 0 0 1, I S O 1 4 0 0 1, I S O 4 5 0 0 1,API certified company and have all the quality systems in place for design, planning, manufacturing and quality monitoring & traceability to ensure that all products match the quality & reliability Standards. We also have an independent measurement and inspection department, the inspection and measuring tools are fully equipped, we control each process to ensure that all products are qualified.
Dongying Zhaoxin Industry and Trade Co.,Ltd with perfect attitude, product and service, is going to make further development together with customers at home and abroad .
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