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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.
API 5CT tubing carries produced or injected fluids inside the well. Specify OD, nominal weight, grade, range, connection, service condition, drift, hydrostatic or NDT requirements, coupling details, inspection level and document package before quotation.
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)
We offer a complete range of API grades tailored to specific downhole conditions:
Standard Service:H40, J55, K55, N80-1, N80-Q
Project-specified sour service candidates: L80-1, C90 and T95, subject to the actual H2S environment and required qualification.
Corrosion Resistance (CO2/Brine):L80-9Cr, L80-13Cr
High Strength:P110
Available in non-upset (NUE) and external upset (EUE) configurations to ensure maximum joint strength:
EUE (External Upset End): An external-upset connection option; confirm joint capacity, clearance and completion compatibility.
NUE (Non-Upset End): A non-upset connection option where the completion design and joint requirements permit it.
Premium Connections: Project-specific connection systems for leak-tightness or demanding service, subject to licensed mill and approved connection availability.
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.
Testing: NDT, hydrostatic pressure testing, drift and thread inspection are performed to the extent required by the governing API 5CT edition, grade, purchase order and approved ITP.
Surface Protection:External black painting, varnish 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.
API 5CT tubing should be selected from the well conditions and approved completion design, not from grade or connection name alone.
| Service condition | Confirm before selection | Evidence to request |
|---|---|---|
| Production well | Depth, pressure, temperature, produced fluid, tubing movement and required flow area | Approved size/weight/grade, connection, drift and tubing tally requirements |
| Water or gas injection | Injection pressure, medium, temperature, corrosion allowance and workover plan | Material compatibility basis, pressure/test requirement and connection acceptance |
| CO2, brine or corrosive fluid | Actual fluid chemistry, temperature, corrosion-control method and expected life | Grade/CRA route, heat treatment, chemistry and project-specific corrosion evidence |
| H2S or sour service | H2S partial pressure, pH, chloride, temperature and governing project requirements | Specified SSC/HIC or other qualification, acceptance criteria and traceable reports |
| Connection route | Typical evaluation point | What must be confirmed |
|---|---|---|
| NUE | Non-upset API tubing connection where the completion design permits it | Joint strength, clearance, make-up requirements and coupling dimensions |
| EUE | External-upset API tubing connection where added end section and joint capacity are required | Connection dimensions, drift/clearance, make-up and compatibility with completion equipment |
| Premium or project-specific connection | High-pressure gas, leak-tightness, thermal or other demanding service | Licensed mill availability, exact connection name, performance envelope and approved procedures |
RFQ fields: API 5CT edition, OD, nominal weight or wall thickness, grade, quantity, R1/R2/R3, NUE/EUE or exact premium connection, upset/coupling details, drift, service conditions, hydrostatic and NDT scope, thread inspection, MTC, third-party inspection, marking and packing.
· API 5CT Tubing Guide for Production, Injection and Corrosive Service
· API 5CT Casing and Tubing Complete Guide
· Standard API Threads vs Premium Connections
· API 5CT Pre-Shipment Inspection Checklist
· API 5CT Couplings, Pup Joints and Crossovers
· Surface Casing vs Intermediate vs Production Casing vs Liner
| 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 |
| 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 |
| 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 |
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.
