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API 5CT Steel Casing (OCTG)
Our API 5CT casing pipes are engineered to serve as the structural pipe used to support and protect the wellbore during drilling and production. Designed to withstand collapse pressure, internal pressure, tensile load and downhole service conditions, these pipes ensure the integrity of the wellbore during drilling and production phases.
1. Technical Specifications
Outside Diameter (OD): 4-1/2" to 20" (114.3mm – 508mm)
Wall Thickness (WT): 5.21mm – 16.13mm
Length Range: R1 (4.88m-7.62m), R2 (7.62m-10.36m),R3 (10.36m-14.63m)
Manufacturing Process: Seamless (SMLS) or Electric Resistance Welded (ERW)
2. API 5CT Steel Grades
We provide a full spectrum of grades categorized by strength and environmental resistance:
Group 1:J55, K55, N80-1, N80-Q
Group 2 (Restricted Yield):L80-1, L80-9Cr, L80-13Cr, C90, T95
Group 3 (High Strength):P110
Group 4:Q125
3. Connection & Threading Types
To ensure leak-proof performance under high pressure, we offer standard and premium connections:
STC(Short Round Thread Casing)
LTC(Long Round Thread Casing)
BTC(Buttress Thread Casing)
Premium Connections:Gas-tight threads for extreme high-pressure or sour service (H2S) environments.
4. Key Application Areas
Surface Casing:Protects freshwater zones and supports the blowout preventer.
Intermediate Casing:Isolates high-pressure zones and unstable formations.
Production Casing:The final conduit for oil and gas production, ensuring long-term well stability.
5. Quality Assurance & Protection
Compliance:Full adherence to API Spec 5CT latest edition; supplied with MTC (EN 10204 3.1).
Testing:100% NDT (Ultrasonic & Magnetic Particle), Hydrostatic testing, and Drift testing.
Surface Treatment:External black painting/vanish, color coding as per API standards.
Packaging:Steel strapped bundles with thread protectors (plastic or composite) for secure maritime transit.
Mechanical Properties of API 5CT Casing Grades
| Group | Grade | Type | Total | Yield Strength (Mpa) | Tensile | Hardness max | ||
| % | min. | max. | MPa | HRC | HBW | |||
| 1 | H40 | — | 0.5 | 276 | 552 | 414 | — | — |
| J55 | — | 0.5 | 379 | 552 | 517 | — | — | |
| K55 | — | 0.5 | 379 | 552 | 655 | — | — | |
| N80 | 1 | 0.5 | 552 | 758 | 689 | — | — | |
| N80 | Q | 0.5 | 552 | 758 | 689 | — | — | |
| R95 | — | 0.5 | 655 | 758 | 724 | — | — | |
| 2 | M65 | — | 0.5 | 445 | 586 | 586 | 22 | 235 |
| L80 | 1 | 0.5 | 552 | 655 | 655 | 23 | 241 | |
| L80 | 9Cr | 0.5 | 552 | 655 | 655 | 23 | 241 | |
| L80 | 13Cr | 0.5 | 552 | 655 | 655 | 23 | 241 | |
| C90 | 1 | 0.5 | 621 | 724 | 689 | 25.4 | 255 | |
| T95 | 1 | 0.5 | 655 | 758 | 724 | 25.4 | 255 | |
| C110 | — | 0.7 | 758 | 828 | 793 | 30 | 286 | |
| 3 | P110 | — | 0.6 | 758 | 965 | 862 | — | — |
| 4 | Q125 | 1 | 0.65 | 862 | 1034 | 931 | — | — |
| a. In case of dispute, laboratory Rockwell C hardness testing shall be used as the referee method. | ||||||||
| b. No hardness limits, but the maximum variation is controlled by manufacturer acc API 5CT. | ||||||||
Chemical Composition of API 5CT Casing Grades
| Group | Grade | Type | C | Mn | Mo | Cr | Ni | Cu | P | S | Si | ||||
| min. | max. | min. | max. | min. | max. | min. | max. | max. | max. | max. | max. | max. | |||
| 1 | H40 | — | — | — | — | — | — | — | — | — | — | — | 0.03 | 0.03 | — |
| J55 | — | — | — | — | — | — | — | — | — | — | — | 0.03 | 0.03 | — | |
| K55 | — | — | — | — | — | — | — | — | — | — | — | 0.03 | 0.03 | — | |
| N80 | 1 | — | — | — | — | — | — | — | — | — | — | 0.03 | 0.03 | — | |
| N80 | Q | — | — | — | — | — | — | — | — | — | — | 0.03 | 0.03 | — | |
| R95 | — | — | 0.45 | — | 1.9 | — | — | — | — | — | — | 0.03 | 0.03 | 0.45 | |
| 2 | M65 | — | — | — | — | — | — | — | — | — | — | — | 0.03 | 0.03 | — |
| L80 | 1 | — | 0.43 | — | 1.9 | — | — | — | — | 0.25 | 0.35 | 0.03 | 0.03 | 0.45 | |
| L80 | 9Cr | — | 0.15 | 0.3 | 0.6 | 0.9 | 1.1 | 8 | 10 | 0.5 | 0.25 | 0.02 | 0.01 | 1 | |
| L80 | 13Cr | 0.15 | 0.22 | 0.25 | 1 | — | — | 12 | 14 | 0.5 | 0.25 | 0.02 | 0.01 | 1 | |
| C90 | 1 | — | 0.35 | — | 1.2 | 0.25 | 0.85 | — | 1.5 | 0.99 | — | 0.02 | 0.01 | — | |
| T95 | 1 | — | 0.35 | — | 1.2 | 0.25 | 0.85 | 0.4 | 1.5 | 0.99 | — | 0.02 | 0.01 | — | |
| C110 | — | — | 0.35 | — | 1.2 | 0.25 | 1 | 0.4 | 1.5 | 0.99 | — | 0.02 | 0.005 | — | |
| 3 | P110 | — | — | — | — | — | — | — | — | — | — | — | 0.03 | 0.03 | — |
| 4 | Q125 | 1 | — | 0.35 | — | 1.35 | — | 0.85 | — | 1.5 | 0.99 | — | 0.02 | 0.01 | — |
| a. The carbon content for L80 may be increased up to 0, 50 % maximum if the product is oil-quenched. | |||||||||||||||
| b. The molybdenum content for Grade C90 Type 1 has no minimum tolerance if the WT is less than 17, 78 mm. | |||||||||||||||
| c. The carbon content for R95 may be increased up to 0, 55 % maximum if the product is oil-quenched. | |||||||||||||||
| d. The molybdenum content for T95 Type 1 may be decreased to 0, 15 % minimum if the WT is less than 17, 78 mm. | |||||||||||||||
| e. For EW Grade P110, the phosphorus content shall be 0,020 % maximum and the sulfur content 0,010 % maximum | |||||||||||||||
| NL = no limit. Elements shown shall be reported in product analysis. | |||||||||||||||
API 5CT Casing Dimensional Tolerances
| Items | Allowable Deviation | |
| Out Diameter | D ≤ 101.60mm | ± 0.79mm |
| D ≥ 114.30mm | + 1.0%, -0.5% | |
| Wall Thickness | -12.50% | |
| Mass (Single Lengths) | +6.5%, -3.5% | |
API 5CT Casing Size, Weight and Grade Availability
| DN | O. D. | Weight | W. T. | End Machining Form | ||||||||
| Steel Grade | ||||||||||||
| Inch | mm | lb/ft | kg/m | Inch | mm | H40 | J55 | L80 | N80 | C90 | P110 | |
| K55 | T95 | |||||||||||
| 4 1/2 | 4.5 | 114.3 | 9.5 | 14.14 | 0.205 | 5.21 | PS | PS | – | – | – | – |
| 10.5 | 15.63 | 0.224 | 5.69 | – | PSB | – | – | – | – | |||
| 11.6 | 17.26 | 0.25 | 6.35 | – | PSLB | PLB | PLB | PLB | PLB | |||
| 13.5 | 20.09 | 0.29 | 7.37 | – | – | PLB | PLB | PLB | PLB | |||
| 15.1 | 22.47 | 0.337 | 9.56 | – | – | – | – | – | PLB | |||
| 5 | 5 | 127 | 11.5 | 17.11 | 0.22 | 5.59 | – | PS | – | – | – | – |
| 13 | 19.35 | 0.253 | 6.43 | – | PSLB | – | – | – | – | |||
| 15 | 22.32 | 0.296 | 7.52 | – | PSLB | PLB | PLB | PLBE | PLB | |||
| 18 | 26.79 | 0.362 | 9.19 | – | – | PLB | PLB | PLBE | PLB | |||
| 21.4 | 31.85 | 0.437 | 11.1 | – | – | PLB | PLB | PLB | PLB | |||
| 23.2 | 34.53 | 0.478 | 12.14 | – | – | – | – | PLB | – | |||
| 24.1 | 35.86 | 0.5 | 12.7 | – | – | – | – | PLB | – | |||
| 5 1/2 | 5.5 | 139.7 | 14 | 20.83 | 0.244 | 6.2 | PS | PS | – | – | – | – |
| 15.5 | 23.07 | 0.275 | 6.98 | – | PSLB | – | – | – | – | |||
| 17 | 25.3 | 0.304 | 7.72 | – | PSLB | PLB | PLB | PLBE | PLB | |||
| 20 | 29.76 | 0.361 | 9.17 | – | – | PLB | PLB | PLBE | PLB | |||
| 23 | 34.23 | 0.415 | 10.54 | – | – | PLB | PLB | PLBE | PLB | |||
| 26.8 | 39.88 | 0.5 | 12.7 | – | – | – | – | – | – | |||
| 29.7 | 44.2 | 0.562 | 14.27 | – | – | – | – | – | – | |||
| 32.6 | 48.51 | 0.625 | 15.88 | – | – | – | – | – | – | |||
| 35.3 | 52.53 | 0.687 | 17.45 | – | – | – | – | – | – | |||
| 38 | 56.55 | 0.75 | 19.05 | – | – | – | – | – | – | |||
| 40.5 | 60.27 | 0.812 | 20.62 | – | – | – | – | – | – | |||
| 43.1 | 64.14 | 0.875 | 22.22 | – | – | – | – | – | – | |||
| 6 5/8 | 6.625 | 168.28 | 20 | 29.76 | 0.288 | 7.32 | PS | PSLB | – | – | – | – |
| 24 | 35.72 | 0.352 | 8.94 | – | PSLB | PLB | PLB | PLBE | PLB | |||
| 28 | 41.67 | 0.417 | 10.59 | – | – | PLB | PLB | PLBE | PLB | |||
| 32 | 47.62 | 0.475 | 12.06 | – | – | PLB | PLB | PLBE | PLB | |||
| 7 | 7 | 177.8 | 17 | 25.3 | 0.231 | 5.87 | PS | – | – | – | – | – |
| 20 | 29.76 | 0.272 | 6.91 | PS | PS | – | – | – | – | |||
| 23 | 34.23 | 0.317 | 8.05 | – | PSLB | PLB | PLB | PLBE | – | |||
| 26 | 38.69 | 0.362 | 9.19 | – | PSLB | PLB | PLB | PLBE | PLB | |||
| 29 | 43.16 | 0.408 | 10.36 | – | – | PLB | PLB | PLBE | PLB | |||
| 32 | 47.62 | 0.453 | 11.51 | – | – | PLB | PLB | PLBE | PLB | |||
| 35 | 52.09 | 0.498 | 12.65 | – | – | PLB | PLB | PLBE | PLB | |||
| 38 | 56.55 | 0.54 | 13.72 | – | – | PLB | PLB | PLBE | PLB | |||
| 42.7 | 63.54 | 0.625 | 15.88 | – | – | – | – | – | – | |||
| 46.4 | 69.05 | 0.687 | 17.45 | – | – | – | – | – | – | |||
| 50.1 | 74.56 | 0.75 | 19.05 | – | – | – | – | – | – | |||
| 53.6 | 79.77 | 0.812 | 20.62 | – | – | – | – | – | – | |||
| 57.1 | 84.97 | 0.875 | 22.22 | – | – | – | – | – | – | |||
| 7 5/8 | 7.625 | 193.68 | 24 | 35.72 | 0.3 | 7.62 | PS | – | – | – | – | – |
| 26.4 | 39.29 | 0.328 | 8.33 | – | PSLB | PLB | PLB | PLBE | PLB | |||
| 29.7 | 44.2 | 0.375 | 9.52 | – | – | PLB | PLB | PLBE | PLB | |||
| 33.7 | 50.15 | 0.43 | 10.92 | – | – | PLB | PLB | PLBE | PLB | |||
| 39 | 58.05 | 0.5 | 12.7 | – | – | PLB | PLB | PLBE | PLB | |||
| 42.8 | 63.69 | 0.562 | 14.27 | – | – | PLB | PLB | PLB | PLB | |||
| 45.3 | 67.41 | 0.595 | 15.11 | – | – | PLB | PLB | PLB | PLB | |||
| 47.1 | 70.09 | 0.625 | 15.88 | – | – | PLB | PLB | PLB | PLB | |||
| 51.2 | 76.19 | 0.687 | 17.45 | – | – | – | – | – | – | |||
| 55.3 | 80.3 | 0.75 | 19.05 | – | – | – | – | – | – | |||
| 8 5/8 | 8.625 | 219.08 | 24 | 35.72 | 0.264 | 6.71 | – | PS | – | – | – | – |
| 28 | 41.62 | 0.304 | 7.72 | PS | – | – | – | – | – | |||
| 32 | 47.62 | 0.352 | 8.94 | PS | PSLB | – | – | – | – | |||
| 36 | 53.57 | 0.4 | 10.16 | – | PSLB | PLB | PLB | PLBE | PLB | |||
| 40 | 59.53 | 0.45 | 11.43 | – | – | PLB | PLB | PLBE | PLB | |||
| 44 | 65.48 | 0.5 | 12.7 | – | – | PLB | PLB | PLBE | PLB | |||
| 49 | 72.92 | 0.557 | 14.15 | – | – | PLB | PLB | PLBE | PLB | |||
| 9 5/8 | 9.625 | 244.48 | 32.3 | 48.07 | 0.312 | 7.92 | PS | – | – | – | – | – |
| 36 | 53.57 | 0.352 | 8.94 | PS | PSLB | – | – | – | – | |||
| 40 | 59.53 | 0.395 | 10.03 | – | PSLB | PLB | PLB | PLBE | – | |||
| 43.5 | 64.73 | 0.435 | 11.05 | – | – | PLB | PLB | PLBE | PLB | |||
| 47 | 69.94 | 0.472 | 11.99 | – | – | PLB | PLB | PLBE | PLB | |||
| 53.5 | 79.62 | 0.545 | 13.84 | – | – | PLB | PLB | PLBE | PLB | |||
| 58.4 | 86.91 | 0.595 | 15.11 | – | – | PLB | PLB | PLB | PLB | |||
| 59.4 | 88.4 | 0.609 | 15.47 | – | – | – | – | – | – | |||
| 64.9 | 96.58 | 0.672 | 17.07 | – | – | – | – | – | – | |||
| 70.3 | 104.62 | 0.734 | 18.64 | – | – | – | – | – | – | |||
| 75.6 | 112.5 | 0.797 | 20.24 | – | – | – | – | – | – | |||
| 10 3/4 | 10.75 | 273.05 | 32.75 | 48.74 | 0.279 | 7.09 | PS | – | – | – | – | – |
| 40.5 | 60.27 | 0.35 | 8.89 | PS | PSB | – | – | – | – | |||
| 15.5 | 67.71 | 0.4 | 10.16 | – | PSB | – | – | – | – | |||
| 51 | 75.9 | 0.45 | 11.43 | – | PSB | PSB | PSB | PSBE | PSB | |||
| 55.5 | 82.59 | 0.495 | 12.57 | – | – | PSB | PSB | PSBE | PSB | |||
| 60.7 | 90.33 | 0.545 | 13.84 | – | – | – | – | PSBE | PSB | |||
| 65.7 | 97.77 | 0.595 | 15.11 | – | – | – | – | PSB | PSB | |||
| 73.2 | 108.93 | 0.672 | 17.07 | – | – | – | – | – | – | |||
| 79.2 | 117.86 | 0.734 | 18.64 | – | – | – | – | – | – | |||
| 85.3 | 126.94 | 0.797 | 20.24 | – | – | – | – | – | – | |||
| 11 3/4 | 11.75 | 298.45 | 42 | 62.5 | 0.333 | 8.46 | PS | – | – | – | – | – |
| 47 | 69.94 | 0.375 | 20.24 | – | – | – | – | – | – | |||
| 54 | 80.36 | 0.435 | 8.46 | – | – | – | – | – | – | |||
| 60 | 89.29 | 0.489 | 9.53 | – | – | – | – | – | – | |||
| 65 | 96.73 | 0.534 | 11.05 | – | – | – | – | – | – | |||
| 71 | 105.66 | 0.582 | 14.42 | – | – | – | – | – | – | |||
| 13 3/8 | 13.375 | 339.73 | 48 | 71.43 | 0.33 | 8.38 | PS | – | – | – | – | – |
| 54.5 | 81.1 | 0.38 | 9.65 | – | PSB | – | – | – | – | |||
| 61 | 90.78 | 0.43 | 10.92 | – | PSB | – | – | – | – | |||
| 68 | 101.19 | 0.48 | 12.19 | – | PSB | PSB | PSB | PSB | PSB | |||
| 72 | 107.15 | 0.514 | 13.06 | – | – | PSB | PSB | PSB | PSB | |||
| 16 | 16 | 406.4 | 65 | 96.73 | 0.375 | 9.53 | PS | – | – | – | – | – |
| 75 | 111.61 | 0.438 | 11.13 | – | PSB | – | – | – | – | |||
| 84 | 125.01 | 0.495 | 12.57 | – | PSB | – | – | – | – | |||
| 109 | 162.21 | 0.656 | 16.66 | – | P | P | P | – | P | |||
| 18 5/8 | 18.625 | 473.08 | 87.5 | 130.21 | 0.435 | 11.05 | PS | PSB | – | – | – | – |
| 20 | 20 | 508 | 94 | 139.89 | 0.438 | 11.13 | PSL | PSLB | – | – | – | – |
| 106.5 | 158.49 | 0.5 | 12.7 | – | PSLB | – | – | – | – | |||
| 133 | 197.93 | 0.635 | 16.13 | – | PSLB | – | – | – | – | |||
| P——Plain；S——Short-thread；L——Long-thread；B——Buttress thread；E——Extreme thread | ||||||||||||
Oil Casing &Tubing (Octg) Production Process
We offer a full range of API 5CT Casing & Tubing, including common grades like J55, K55, N80, and L80, available with standard connections (STC, LTC, BTC) or premium connections for specialized drilling environments.
Every pipe is manufactured to strict API 5L and API 5CT specifications and undergoes rigorous Internal Quality Control, including hydrostatic and non-destructive testing, to ensure reliability under downhole pressure.
Yes, all products are delivered with a Mill Test Certificate (MTC) according to EN 10204 3.1, providing complete traceability of chemical composition and mechanical properties required for oil and gas projects.
Mechanical Properties of API 5CT Casing Grades
| Group | Grade | Type | Total | Yield Strength (Mpa) | Tensile | Hardness max | ||
| % | min. | max. | MPa | HRC | HBW | |||
| 1 | H40 | — | 0.5 | 276 | 552 | 414 | — | — |
| J55 | — | 0.5 | 379 | 552 | 517 | — | — | |
| K55 | — | 0.5 | 379 | 552 | 655 | — | — | |
| N80 | 1 | 0.5 | 552 | 758 | 689 | — | — | |
| N80 | Q | 0.5 | 552 | 758 | 689 | — | — | |
| R95 | — | 0.5 | 655 | 758 | 724 | — | — | |
| 2 | M65 | — | 0.5 | 445 | 586 | 586 | 22 | 235 |
| L80 | 1 | 0.5 | 552 | 655 | 655 | 23 | 241 | |
| L80 | 9Cr | 0.5 | 552 | 655 | 655 | 23 | 241 | |
| L80 | 13Cr | 0.5 | 552 | 655 | 655 | 23 | 241 | |
| C90 | 1 | 0.5 | 621 | 724 | 689 | 25.4 | 255 | |
| T95 | 1 | 0.5 | 655 | 758 | 724 | 25.4 | 255 | |
| C110 | — | 0.7 | 758 | 828 | 793 | 30 | 286 | |
| 3 | P110 | — | 0.6 | 758 | 965 | 862 | — | — |
| 4 | Q125 | 1 | 0.65 | 862 | 1034 | 931 | — | — |
| a. In case of dispute, laboratory Rockwell C hardness testing shall be used as the referee method. | ||||||||
| b. No hardness limits, but the maximum variation is controlled by manufacturer acc API 5CT. | ||||||||
Chemical Composition of API 5CT Casing Grades
| Group | Grade | Type | C | Mn | Mo | Cr | Ni | Cu | P | S | Si | ||||
| min. | max. | min. | max. | min. | max. | min. | max. | max. | max. | max. | max. | max. | |||
| 1 | H40 | — | — | — | — | — | — | — | — | — | — | — | 0.03 | 0.03 | — |
| J55 | — | — | — | — | — | — | — | — | — | — | — | 0.03 | 0.03 | — | |
| K55 | — | — | — | — | — | — | — | — | — | — | — | 0.03 | 0.03 | — | |
| N80 | 1 | — | — | — | — | — | — | — | — | — | — | 0.03 | 0.03 | — | |
| N80 | Q | — | — | — | — | — | — | — | — | — | — | 0.03 | 0.03 | — | |
| R95 | — | — | 0.45 | — | 1.9 | — | — | — | — | — | — | 0.03 | 0.03 | 0.45 | |
| 2 | M65 | — | — | — | — | — | — | — | — | — | — | — | 0.03 | 0.03 | — |
| L80 | 1 | — | 0.43 | — | 1.9 | — | — | — | — | 0.25 | 0.35 | 0.03 | 0.03 | 0.45 | |
| L80 | 9Cr | — | 0.15 | 0.3 | 0.6 | 0.9 | 1.1 | 8 | 10 | 0.5 | 0.25 | 0.02 | 0.01 | 1 | |
| L80 | 13Cr | 0.15 | 0.22 | 0.25 | 1 | — | — | 12 | 14 | 0.5 | 0.25 | 0.02 | 0.01 | 1 | |
| C90 | 1 | — | 0.35 | — | 1.2 | 0.25 | 0.85 | — | 1.5 | 0.99 | — | 0.02 | 0.01 | — | |
| T95 | 1 | — | 0.35 | — | 1.2 | 0.25 | 0.85 | 0.4 | 1.5 | 0.99 | — | 0.02 | 0.01 | — | |
| C110 | — | — | 0.35 | — | 1.2 | 0.25 | 1 | 0.4 | 1.5 | 0.99 | — | 0.02 | 0.005 | — | |
| 3 | P110 | — | — | — | — | — | — | — | — | — | — | — | 0.03 | 0.03 | — |
| 4 | Q125 | 1 | — | 0.35 | — | 1.35 | — | 0.85 | — | 1.5 | 0.99 | — | 0.02 | 0.01 | — |
| a. The carbon content for L80 may be increased up to 0, 50 % maximum if the product is oil-quenched. | |||||||||||||||
| b. The molybdenum content for Grade C90 Type 1 has no minimum tolerance if the WT is less than 17, 78 mm. | |||||||||||||||
| c. The carbon content for R95 may be increased up to 0, 55 % maximum if the product is oil-quenched. | |||||||||||||||
| d. The molybdenum content for T95 Type 1 may be decreased to 0, 15 % minimum if the WT is less than 17, 78 mm. | |||||||||||||||
| e. For EW Grade P110, the phosphorus content shall be 0,020 % maximum and the sulfur content 0,010 % maximum | |||||||||||||||
| NL = no limit. Elements shown shall be reported in product analysis. | |||||||||||||||
API 5CT Casing Dimensional Tolerances
| Items | Allowable Deviation | |
| Out Diameter | D ≤ 101.60mm | ± 0.79mm |
| D ≥ 114.30mm | + 1.0%, -0.5% | |
| Wall Thickness | -12.50% | |
| Mass (Single Lengths) | +6.5%, -3.5% | |
API 5CT Casing Size, Weight and Grade Availability
| DN | O. D. | Weight | W. T. | End Machining Form | ||||||||
| Steel Grade | ||||||||||||
| Inch | mm | lb/ft | kg/m | Inch | mm | H40 | J55 | L80 | N80 | C90 | P110 | |
| K55 | T95 | |||||||||||
| 4 1/2 | 4.5 | 114.3 | 9.5 | 14.14 | 0.205 | 5.21 | PS | PS | – | – | – | – |
| 10.5 | 15.63 | 0.224 | 5.69 | – | PSB | – | – | – | – | |||
| 11.6 | 17.26 | 0.25 | 6.35 | – | PSLB | PLB | PLB | PLB | PLB | |||
| 13.5 | 20.09 | 0.29 | 7.37 | – | – | PLB | PLB | PLB | PLB | |||
| 15.1 | 22.47 | 0.337 | 9.56 | – | – | – | – | – | PLB | |||
| 5 | 5 | 127 | 11.5 | 17.11 | 0.22 | 5.59 | – | PS | – | – | – | – |
| 13 | 19.35 | 0.253 | 6.43 | – | PSLB | – | – | – | – | |||
| 15 | 22.32 | 0.296 | 7.52 | – | PSLB | PLB | PLB | PLBE | PLB | |||
| 18 | 26.79 | 0.362 | 9.19 | – | – | PLB | PLB | PLBE | PLB | |||
| 21.4 | 31.85 | 0.437 | 11.1 | – | – | PLB | PLB | PLB | PLB | |||
| 23.2 | 34.53 | 0.478 | 12.14 | – | – | – | – | PLB | – | |||
| 24.1 | 35.86 | 0.5 | 12.7 | – | – | – | – | PLB | – | |||
| 5 1/2 | 5.5 | 139.7 | 14 | 20.83 | 0.244 | 6.2 | PS | PS | – | – | – | – |
| 15.5 | 23.07 | 0.275 | 6.98 | – | PSLB | – | – | – | – | |||
| 17 | 25.3 | 0.304 | 7.72 | – | PSLB | PLB | PLB | PLBE | PLB | |||
| 20 | 29.76 | 0.361 | 9.17 | – | – | PLB | PLB | PLBE | PLB | |||
| 23 | 34.23 | 0.415 | 10.54 | – | – | PLB | PLB | PLBE | PLB | |||
| 26.8 | 39.88 | 0.5 | 12.7 | – | – | – | – | – | – | |||
| 29.7 | 44.2 | 0.562 | 14.27 | – | – | – | – | – | – | |||
| 32.6 | 48.51 | 0.625 | 15.88 | – | – | – | – | – | – | |||
| 35.3 | 52.53 | 0.687 | 17.45 | – | – | – | – | – | – | |||
| 38 | 56.55 | 0.75 | 19.05 | – | – | – | – | – | – | |||
| 40.5 | 60.27 | 0.812 | 20.62 | – | – | – | – | – | – | |||
| 43.1 | 64.14 | 0.875 | 22.22 | – | – | – | – | – | – | |||
| 6 5/8 | 6.625 | 168.28 | 20 | 29.76 | 0.288 | 7.32 | PS | PSLB | – | – | – | – |
| 24 | 35.72 | 0.352 | 8.94 | – | PSLB | PLB | PLB | PLBE | PLB | |||
| 28 | 41.67 | 0.417 | 10.59 | – | – | PLB | PLB | PLBE | PLB | |||
| 32 | 47.62 | 0.475 | 12.06 | – | – | PLB | PLB | PLBE | PLB | |||
| 7 | 7 | 177.8 | 17 | 25.3 | 0.231 | 5.87 | PS | – | – | – | – | – |
| 20 | 29.76 | 0.272 | 6.91 | PS | PS | – | – | – | – | |||
| 23 | 34.23 | 0.317 | 8.05 | – | PSLB | PLB | PLB | PLBE | – | |||
| 26 | 38.69 | 0.362 | 9.19 | – | PSLB | PLB | PLB | PLBE | PLB | |||
| 29 | 43.16 | 0.408 | 10.36 | – | – | PLB | PLB | PLBE | PLB | |||
| 32 | 47.62 | 0.453 | 11.51 | – | – | PLB | PLB | PLBE | PLB | |||
| 35 | 52.09 | 0.498 | 12.65 | – | – | PLB | PLB | PLBE | PLB | |||
| 38 | 56.55 | 0.54 | 13.72 | – | – | PLB | PLB | PLBE | PLB | |||
| 42.7 | 63.54 | 0.625 | 15.88 | – | – | – | – | – | – | |||
| 46.4 | 69.05 | 0.687 | 17.45 | – | – | – | – | – | – | |||
| 50.1 | 74.56 | 0.75 | 19.05 | – | – | – | – | – | – | |||
| 53.6 | 79.77 | 0.812 | 20.62 | – | – | – | – | – | – | |||
| 57.1 | 84.97 | 0.875 | 22.22 | – | – | – | – | – | – | |||
| 7 5/8 | 7.625 | 193.68 | 24 | 35.72 | 0.3 | 7.62 | PS | – | – | – | – | – |
| 26.4 | 39.29 | 0.328 | 8.33 | – | PSLB | PLB | PLB | PLBE | PLB | |||
| 29.7 | 44.2 | 0.375 | 9.52 | – | – | PLB | PLB | PLBE | PLB | |||
| 33.7 | 50.15 | 0.43 | 10.92 | – | – | PLB | PLB | PLBE | PLB | |||
| 39 | 58.05 | 0.5 | 12.7 | – | – | PLB | PLB | PLBE | PLB | |||
| 42.8 | 63.69 | 0.562 | 14.27 | – | – | PLB | PLB | PLB | PLB | |||
| 45.3 | 67.41 | 0.595 | 15.11 | – | – | PLB | PLB | PLB | PLB | |||
| 47.1 | 70.09 | 0.625 | 15.88 | – | – | PLB | PLB | PLB | PLB | |||
| 51.2 | 76.19 | 0.687 | 17.45 | – | – | – | – | – | – | |||
| 55.3 | 80.3 | 0.75 | 19.05 | – | – | – | – | – | – | |||
| 8 5/8 | 8.625 | 219.08 | 24 | 35.72 | 0.264 | 6.71 | – | PS | – | – | – | – |
| 28 | 41.62 | 0.304 | 7.72 | PS | – | – | – | – | – | |||
| 32 | 47.62 | 0.352 | 8.94 | PS | PSLB | – | – | – | – | |||
| 36 | 53.57 | 0.4 | 10.16 | – | PSLB | PLB | PLB | PLBE | PLB | |||
| 40 | 59.53 | 0.45 | 11.43 | – | – | PLB | PLB | PLBE | PLB | |||
| 44 | 65.48 | 0.5 | 12.7 | – | – | PLB | PLB | PLBE | PLB | |||
| 49 | 72.92 | 0.557 | 14.15 | – | – | PLB | PLB | PLBE | PLB | |||
| 9 5/8 | 9.625 | 244.48 | 32.3 | 48.07 | 0.312 | 7.92 | PS | – | – | – | – | – |
| 36 | 53.57 | 0.352 | 8.94 | PS | PSLB | – | – | – | – | |||
| 40 | 59.53 | 0.395 | 10.03 | – | PSLB | PLB | PLB | PLBE | – | |||
| 43.5 | 64.73 | 0.435 | 11.05 | – | – | PLB | PLB | PLBE | PLB | |||
| 47 | 69.94 | 0.472 | 11.99 | – | – | PLB | PLB | PLBE | PLB | |||
| 53.5 | 79.62 | 0.545 | 13.84 | – | – | PLB | PLB | PLBE | PLB | |||
| 58.4 | 86.91 | 0.595 | 15.11 | – | – | PLB | PLB | PLB | PLB | |||
| 59.4 | 88.4 | 0.609 | 15.47 | – | – | – | – | – | – | |||
| 64.9 | 96.58 | 0.672 | 17.07 | – | – | – | – | – | – | |||
| 70.3 | 104.62 | 0.734 | 18.64 | – | – | – | – | – | – | |||
| 75.6 | 112.5 | 0.797 | 20.24 | – | – | – | – | – | – | |||
| 10 3/4 | 10.75 | 273.05 | 32.75 | 48.74 | 0.279 | 7.09 | PS | – | – | – | – | – |
| 40.5 | 60.27 | 0.35 | 8.89 | PS | PSB | – | – | – | – | |||
| 15.5 | 67.71 | 0.4 | 10.16 | – | PSB | – | – | – | – | |||
| 51 | 75.9 | 0.45 | 11.43 | – | PSB | PSB | PSB | PSBE | PSB | |||
| 55.5 | 82.59 | 0.495 | 12.57 | – | – | PSB | PSB | PSBE | PSB | |||
| 60.7 | 90.33 | 0.545 | 13.84 | – | – | – | – | PSBE | PSB | |||
| 65.7 | 97.77 | 0.595 | 15.11 | – | – | – | – | PSB | PSB | |||
| 73.2 | 108.93 | 0.672 | 17.07 | – | – | – | – | – | – | |||
| 79.2 | 117.86 | 0.734 | 18.64 | – | – | – | – | – | – | |||
| 85.3 | 126.94 | 0.797 | 20.24 | – | – | – | – | – | – | |||
| 11 3/4 | 11.75 | 298.45 | 42 | 62.5 | 0.333 | 8.46 | PS | – | – | – | – | – |
| 47 | 69.94 | 0.375 | 20.24 | – | – | – | – | – | – | |||
| 54 | 80.36 | 0.435 | 8.46 | – | – | – | – | – | – | |||
| 60 | 89.29 | 0.489 | 9.53 | – | – | – | – | – | – | |||
| 65 | 96.73 | 0.534 | 11.05 | – | – | – | – | – | – | |||
| 71 | 105.66 | 0.582 | 14.42 | – | – | – | – | – | – | |||
| 13 3/8 | 13.375 | 339.73 | 48 | 71.43 | 0.33 | 8.38 | PS | – | – | – | – | – |
| 54.5 | 81.1 | 0.38 | 9.65 | – | PSB | – | – | – | – | |||
| 61 | 90.78 | 0.43 | 10.92 | – | PSB | – | – | – | – | |||
| 68 | 101.19 | 0.48 | 12.19 | – | PSB | PSB | PSB | PSB | PSB | |||
| 72 | 107.15 | 0.514 | 13.06 | – | – | PSB | PSB | PSB | PSB | |||
| 16 | 16 | 406.4 | 65 | 96.73 | 0.375 | 9.53 | PS | – | – | – | – | – |
| 75 | 111.61 | 0.438 | 11.13 | – | PSB | – | – | – | – | |||
| 84 | 125.01 | 0.495 | 12.57 | – | PSB | – | – | – | – | |||
| 109 | 162.21 | 0.656 | 16.66 | – | P | P | P | – | P | |||
| 18 5/8 | 18.625 | 473.08 | 87.5 | 130.21 | 0.435 | 11.05 | PS | PSB | – | – | – | – |
| 20 | 20 | 508 | 94 | 139.89 | 0.438 | 11.13 | PSL | PSLB | – | – | – | – |
| 106.5 | 158.49 | 0.5 | 12.7 | – | PSLB | – | – | – | – | |||
| 133 | 197.93 | 0.635 | 16.13 | – | PSLB | – | – | – | – | |||
| P——Plain；S——Short-thread；L——Long-thread；B——Buttress thread；E——Extreme thread | ||||||||||||
Oil Casing &Tubing (Octg) Production Process
We offer a full range of API 5CT Casing & Tubing, including common grades like J55, K55, N80, and L80, available with standard connections (STC, LTC, BTC) or premium connections for specialized drilling environments.
Every pipe is manufactured to strict API 5L and API 5CT specifications and undergoes rigorous Internal Quality Control, including hydrostatic and non-destructive testing, to ensure reliability under downhole pressure.
Yes, all products are delivered with a Mill Test Certificate (MTC) according to EN 10204 3.1, providing complete traceability of chemical composition and mechanical properties required for oil and gas projects.
