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API 5CT Oil Tubing (OCTG)
Our API 5CT Tubing is the primary conduit used to transport crude oil and natural gas from the producing formation to the surface. API 5CT tubing is used as the production conduit for oil and gas wells. Buyers should confirm size, weight, grade, connection type, upset type, length range and inspection requirements before ordering.
1. Technical Specifications
Outside Diameter (OD): 1.050" to 4-1/2" (26.67mm – 114.3mm)
Wall Thickness (WT): 2.87mm – 16.0mm
Length Range: R1 (6.10m-8.53m),R2 (8.53m-9.75m), R3 (9.75m-12.80m)
Manufacturing Process:Seamless (SMLS) or Electric Resistance Welded (ERW)
2. Material Grades & Service Environments
We offer a complete range of API grades tailored to specific downhole conditions:
Standard Service:H40, J55, K55, N80-1, N80-Q
Sour Service (H2S Resistance):L80-1, C90, T95
Corrosion Resistance (CO2/Brine):L80-9Cr, L80-13Cr
High Strength:P110
3. Connection & Threading Types
Available in non-upset (NUE) and external upset (EUE) configurations to ensure maximum joint strength:
EUE (External Upset End):Reinforced ends for higher tensile strength in deep wells.
NUE (Non-Upset End):Used for shallower or lower-pressure applications.
Premium Connections:Special gas-tight threads for high-pressure gas wells and thermal recovery.
4. Key Applications
Production Strings:The main flow path for oil and gas extraction.
Injection Wells:Used for water or gas injection in Enhanced Oil Recovery (EOR).
Workover & Completion:Essential for well maintenance and intervention services.
5. Quality Control & Surface Treatment
Testing:100% Non-Destructive Testing (NDT), Hydrostatic pressure testing, and Drift testing (Full Length Drift).
Surface Protection:External black painting, vanish coating, and internal lining (optional) for corrosion prevention.
Packaging:Steel-strapped bundles with heavy-duty thread protectors; color-coded bands for grade identification according to API 5CT.
Tubing pipe specifications chart
| Nominal OD (inch) | OD (mm) | Wall Thickness (mm) | Nominal Weight (lb/ft - PPF) | Linear Weight (kg/m) | Common Thread Types |
| 1.05 | 26.67 | 2.87 | 1.14 | 1.7 | NU |
| 1.315 | 33.4 | 3.38 | 1.7 | 2.53 | NU, EU |
| 1.66 | 42.16 | 3.56 | 2.3 | 3.42 | NU, EU |
| 1.9 | 48.26 | 3.68 | 2.75 | 4.09 | NU, EU |
| 2-1/16 | 52.4 | 3.91 | 3.25 | 4.84 | IJ (Integral Joint) |
| 2-3/8 | 60.33 | 4.24 | 4 | 5.95 | NU, EU, PH6, FJ |
| 2-3/8 | 60.33 | 4.83 | 4.6 | 6.85 | NU, EU, PH6 |
| 2-3/8 | 60.33 | 6.27 | 5.8 | 8.63 | EU, PH6, FJ |
| 2-7/8 | 73.03 | 5.51 | 6.4 | 9.52 | NU, EU, PH6, FJ |
| 2-7/8 | 73.03 | 7.01 | 7.9 | 11.76 | EU, PH6, FJ |
| 2-7/8 | 73.03 | 8.64 | 9.35 | 13.91 | EU, PH6 |
| 3-1/2 | 88.9 | 5.49 | 7.7 | 11.46 | NU |
| 3-1/2 | 88.9 | 6.45 | 9.2 | 13.69 | NU, EU, PH6, FJ |
| 3-1/2 | 88.9 | 7.34 | 10.2 | 15.18 | EU, PH6, FJ |
| 3-1/2 | 88.9 | 9.22 | 12.7 | 18.9 | EU, PH6, FJ |
| 3-1/2 | 88.9 | 11.4 | 15.5 | 23.07 | EU, PH6 |
| 4 | 101.6 | 5.74 | 9.5 | 14.14 | NU, EU |
| 4 | 101.6 | 6.65 | 11 | 16.37 | NU, EU, FJ |
| 4-1/2 | 114.3 | 5.69 | 10.5 | 15.63 | NU |
| 4-1/2 | 114.3 | 6.35 | 11.6 | 17.26 | NU, EU, BTC |
| 4-1/2 | 114.3 | 7.37 | 13.5 | 20.09 | EU, BTC, LTC |
| 4-1/2 | 114.3 | 8.56 | 15.1 | 22.47 | EU, BTC, LTC |
| 4-1/2 | 114.3 | 10.54 | 18.9 | 28.13 | EU, PH6 |
Mechanical Properties of API 5CT Tubing Grades
| Grade Group | Steel Grade | Yield Strength Rt 0.5% (psi) | Yield Strength (MPa) | Tensile Strength Rm (min psi) | Tensile Strength (min MPa) |
| Group 1 | H40 | 40,000 – 80,000 | 276 – 552 | 60,000 | 414 |
| J55 | 55,000 – 80,000 | 379 – 552 | 75,000 | 517 | |
| K55 | 55,000 – 80,000 | 379 – 552 | 95,000 | 655 | |
| N80-1 / N80-Q | 80,000 – 110,000 | 552 – 758 | 100,000 | 689 | |
| Group 2 | L80 (1/9Cr/13Cr) | 80,000 – 95,000 | 552 – 655 | 95,000 | 655 |
| C90 | 90,000 – 105,000 | 621 – 724 | 100,000 | 689 | |
| T95 | 95,000 – 110,000 | 655 – 758 | 105,000 | 724 | |
| C110 | 110,000 – 120,000 | 758 – 827 | 115,000 | 793 | |
| Group 3 | P110 | 110,000 – 140,000 | 758 – 965 | 125,000 | 862 |
| Group 4 | Q125 | 125,000 – 150,000 | 862 – 1,034 | 135,000 | 931 |
API 5CT Steel Grades Chemical Components
| Chemical Components (%) | ||||||||
| Steel Grade | C | Mn | Mo | Cr | Ni | P (max) | S (max) | Si (max) |
| H40 | - | - | - | - | - | 0.03 | 0.03 | - |
| J55 | - | - | - | - | - | 0.03 | 0.03 | - |
| K55 | - | - | - | - | - | 0.03 | 0.03 | - |
| N80-1/Q | - | - | - | - | - | 0.03 | 0.03 | - |
| L80 (Type 1) | 0.43 | 1.9 | - | - | 0.25 | 0.03 | 0.03 | 0.45 |
| L80 (9Cr) | 0.15 | 0.30–0.60 | 0.90–1.10 | 8.0–10.0 | 0.5 | 0.02 | 0.01 | 1 |
| L80 (13Cr) | 0.15–0.22 | 0.25–1.00 | - | 12.0–14.0 | 0.5 | 0.02 | 0.01 | 1 |
| C90 (Type 1) | 0.35 | 1.2 | 0.25–0.85 | 1.5 | 0.99 | 0.02 | 0.01 | 0.45 |
| T95 (Type 1) | 0.35 | 1.2 | 0.25–0.85 | 1.5 | 0.99 | 0.02 | 0.01 | 0.45 |
| C110 | 0.35 | 1.2 | 0.50–1.00 | 0.40–1.50 | 0.99 | 0.02 | 0.01 | 0.45 |
| P110 | - | - | - | - | - | 0.03 | 0.03 | - |
| Q125 | 0.35* | 1.35 | 0.85 | 1.5 | 0.99 | 0.02 | 0.01 | 0.45 |
Oil Casing &Tubing (Octg) Production Process
They usually compare corrosion risk, connection reliability, well depth, and pressure exposure rather than only grade names. Tubing decisions often reflect production conditions more than catalog familiarity. Typical long-tail phrases include API 5CT tubing pipe for oil production, J55 or L80 tubing, and tubing pipe for sour service wells.
Differences often come from upset type, connection route, inspection level, and whether the supplier is quoting for a straightforward well or a more demanding completion program. Buyers often need to compare scope, not just price. This is common when buyers compare J55 tubing, N80 tubing, and L80 tubing for different production conditions and corrosion risks.
The most useful starting question is usually what the well environment is likely to attack first: strength margin, sour service, or corrosion. That quickly narrows the realistic choices. That question comes up most in oil production tubing, gas well tubing, and corrosion-sensitive field development projects.
Approvals often get held up by thread details, upset configuration, premium connection expectations, and document review. Those are common late-stage friction points in OCTG buying. Execution delays are common in API 5CT tubing supply when EUE, NUE, or premium connection expectations are clarified only after the first quote.
Tubing pipe specifications chart
| Nominal OD (inch) | OD (mm) | Wall Thickness (mm) | Nominal Weight (lb/ft - PPF) | Linear Weight (kg/m) | Common Thread Types |
| 1.05 | 26.67 | 2.87 | 1.14 | 1.7 | NU |
| 1.315 | 33.4 | 3.38 | 1.7 | 2.53 | NU, EU |
| 1.66 | 42.16 | 3.56 | 2.3 | 3.42 | NU, EU |
| 1.9 | 48.26 | 3.68 | 2.75 | 4.09 | NU, EU |
| 2-1/16 | 52.4 | 3.91 | 3.25 | 4.84 | IJ (Integral Joint) |
| 2-3/8 | 60.33 | 4.24 | 4 | 5.95 | NU, EU, PH6, FJ |
| 2-3/8 | 60.33 | 4.83 | 4.6 | 6.85 | NU, EU, PH6 |
| 2-3/8 | 60.33 | 6.27 | 5.8 | 8.63 | EU, PH6, FJ |
| 2-7/8 | 73.03 | 5.51 | 6.4 | 9.52 | NU, EU, PH6, FJ |
| 2-7/8 | 73.03 | 7.01 | 7.9 | 11.76 | EU, PH6, FJ |
| 2-7/8 | 73.03 | 8.64 | 9.35 | 13.91 | EU, PH6 |
| 3-1/2 | 88.9 | 5.49 | 7.7 | 11.46 | NU |
| 3-1/2 | 88.9 | 6.45 | 9.2 | 13.69 | NU, EU, PH6, FJ |
| 3-1/2 | 88.9 | 7.34 | 10.2 | 15.18 | EU, PH6, FJ |
| 3-1/2 | 88.9 | 9.22 | 12.7 | 18.9 | EU, PH6, FJ |
| 3-1/2 | 88.9 | 11.4 | 15.5 | 23.07 | EU, PH6 |
| 4 | 101.6 | 5.74 | 9.5 | 14.14 | NU, EU |
| 4 | 101.6 | 6.65 | 11 | 16.37 | NU, EU, FJ |
| 4-1/2 | 114.3 | 5.69 | 10.5 | 15.63 | NU |
| 4-1/2 | 114.3 | 6.35 | 11.6 | 17.26 | NU, EU, BTC |
| 4-1/2 | 114.3 | 7.37 | 13.5 | 20.09 | EU, BTC, LTC |
| 4-1/2 | 114.3 | 8.56 | 15.1 | 22.47 | EU, BTC, LTC |
| 4-1/2 | 114.3 | 10.54 | 18.9 | 28.13 | EU, PH6 |
Mechanical Properties of API 5CT Tubing Grades
| Grade Group | Steel Grade | Yield Strength Rt 0.5% (psi) | Yield Strength (MPa) | Tensile Strength Rm (min psi) | Tensile Strength (min MPa) |
| Group 1 | H40 | 40,000 – 80,000 | 276 – 552 | 60,000 | 414 |
| J55 | 55,000 – 80,000 | 379 – 552 | 75,000 | 517 | |
| K55 | 55,000 – 80,000 | 379 – 552 | 95,000 | 655 | |
| N80-1 / N80-Q | 80,000 – 110,000 | 552 – 758 | 100,000 | 689 | |
| Group 2 | L80 (1/9Cr/13Cr) | 80,000 – 95,000 | 552 – 655 | 95,000 | 655 |
| C90 | 90,000 – 105,000 | 621 – 724 | 100,000 | 689 | |
| T95 | 95,000 – 110,000 | 655 – 758 | 105,000 | 724 | |
| C110 | 110,000 – 120,000 | 758 – 827 | 115,000 | 793 | |
| Group 3 | P110 | 110,000 – 140,000 | 758 – 965 | 125,000 | 862 |
| Group 4 | Q125 | 125,000 – 150,000 | 862 – 1,034 | 135,000 | 931 |
API 5CT Steel Grades Chemical Components
| Chemical Components (%) | ||||||||
| Steel Grade | C | Mn | Mo | Cr | Ni | P (max) | S (max) | Si (max) |
| H40 | - | - | - | - | - | 0.03 | 0.03 | - |
| J55 | - | - | - | - | - | 0.03 | 0.03 | - |
| K55 | - | - | - | - | - | 0.03 | 0.03 | - |
| N80-1/Q | - | - | - | - | - | 0.03 | 0.03 | - |
| L80 (Type 1) | 0.43 | 1.9 | - | - | 0.25 | 0.03 | 0.03 | 0.45 |
| L80 (9Cr) | 0.15 | 0.30–0.60 | 0.90–1.10 | 8.0–10.0 | 0.5 | 0.02 | 0.01 | 1 |
| L80 (13Cr) | 0.15–0.22 | 0.25–1.00 | - | 12.0–14.0 | 0.5 | 0.02 | 0.01 | 1 |
| C90 (Type 1) | 0.35 | 1.2 | 0.25–0.85 | 1.5 | 0.99 | 0.02 | 0.01 | 0.45 |
| T95 (Type 1) | 0.35 | 1.2 | 0.25–0.85 | 1.5 | 0.99 | 0.02 | 0.01 | 0.45 |
| C110 | 0.35 | 1.2 | 0.50–1.00 | 0.40–1.50 | 0.99 | 0.02 | 0.01 | 0.45 |
| P110 | - | - | - | - | - | 0.03 | 0.03 | - |
| Q125 | 0.35* | 1.35 | 0.85 | 1.5 | 0.99 | 0.02 | 0.01 | 0.45 |
Oil Casing &Tubing (Octg) Production Process
They usually compare corrosion risk, connection reliability, well depth, and pressure exposure rather than only grade names. Tubing decisions often reflect production conditions more than catalog familiarity. Typical long-tail phrases include API 5CT tubing pipe for oil production, J55 or L80 tubing, and tubing pipe for sour service wells.
Differences often come from upset type, connection route, inspection level, and whether the supplier is quoting for a straightforward well or a more demanding completion program. Buyers often need to compare scope, not just price. This is common when buyers compare J55 tubing, N80 tubing, and L80 tubing for different production conditions and corrosion risks.
The most useful starting question is usually what the well environment is likely to attack first: strength margin, sour service, or corrosion. That quickly narrows the realistic choices. That question comes up most in oil production tubing, gas well tubing, and corrosion-sensitive field development projects.
Approvals often get held up by thread details, upset configuration, premium connection expectations, and document review. Those are common late-stage friction points in OCTG buying. Execution delays are common in API 5CT tubing supply when EUE, NUE, or premium connection expectations are clarified only after the first quote.
