| Customization: | Available |
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| After-sales Service: | 12 Months |
| Warranty: | 12 Months |
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API Casing Couplings refer to the steel couplings that used in connecting casing pipe and tubing. Also known by OCTG coupling, it is usually manufactured in seamless type, material grade same with the pipe body (API 5CT K55/J55, N80, L80, P110 etc),. Same heat treatment also applicable, except there is an special requirements. The two joints of casing are threaded into opposite ends of the casing coupling.All our products are produced and processed according to API SPEC5B5CT, with the materials of steel grade including J55,K55,N80,N801, N80Q,L80,P110 and so on.
Raw material selection
Mechanical test including tensile strength
Impact test
Chemical properties control
Sulfide stress cracking test (for Material grades in C90 or T95)
Size tolerances, OD, Wall Thickness, Length and Straightness
Threads control, threads quantity per inch, threads angle etc (Premium threads option will be more rigorous)
Heat treatment
| Casing Size OD(in) |
Coupling size OD(in) |
Length(in) |
Weight per coupling(kg) |
Quantity per pallet | Pallet weight(kg) |
| 4 1/2 | 5.000 | 7.000 | 4.15 | 294 | 1220 |
| 5 | 5.563 | 7.750 | 5.75 | 210 | 1208 |
| 5 1/2 | 6.050 | 8.000 | 6.42 | 180 | 1156 |
| 6 5/8 | 7.390 | 8.750 | 11.34 | 100 | 1134 |
| 7 | 7.656 | 9.000 | 10.83 | 100 | 1083 |
| 7 5/8 | 8.500 | 9.250 | 15.63 | 80 | 1250 |
| 8 5/8 | 9.625 | 10.000 | 21.67 | 48 | 1040 |
| 9 5/8 | 10.625 | 10.500 | 25.45 | 40 | 1018 |
Dongying Zhaoxin Industry and Trade Co.,Ltd is an ISO-9001, ISO-14001, OHSAS-18001 certified company and has all the quality systems in place for design, planning,manufacturing and quality monitoring & traceability to ensure that Dongying Zhaoxin Industry and Trade Co.,Ltd products match the highest quality & reliability Standards similar to any International major in this field.
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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