Seamless
API 5CT Seamless Casing
API 5CT seamless casing in J55, K55, N80, L80, P110 and Q125 — for surface, intermediate, and production casing strings in onshore and offshore wells.
API 5CT seamless casing
OVERVIEW
Wellbore integrity from surface to TD.
Global Seamless manufactures API 5CT seamless casing in grades J55 through Q125 for surface, intermediate, and production casing applications. Every joint is produced with full API monogram licensing, drift testing, and material traceability from billet to finished casing.
Our OCTG casing program covers conventional and unconventional wells — from shallow onshore surface casing to deep high-pressure production strings requiring controlled-yield L80 and collapse-resistant P110 grades.
✓ API 5CT licensed with API monogram
✓ Grades: J55, K55, N80, L80, C90, T95, P110, Q125
✓ Connections: STC, LTC, BTC, premium
✓ Full drift, hydrostatic, and NDT testing
✓ Sour service grades to NACE MR0175
✓ Grades: J55, K55, N80, L80, C90, T95, P110, Q125
✓ Connections: STC, LTC, BTC, premium
✓ Full drift, hydrostatic, and NDT testing
✓ Sour service grades to NACE MR0175
API 5CT seamless casing pipe
DIMENSIONAL SPECIFICATIONS
Available size range.
Cold Drawn Seamless (CDS)
| Outside Diameter (OD) | Wall Thickness (WT) | Range | Connection |
|---|---|---|---|
| 4-1/2" – 7" | per API schedule | R2 / R3 | STC / LTC / BTC |
| 7-5/8" – 9-5/8" | per API schedule | R2 / R3 | LTC / BTC |
| 10-3/4" – 13-3/8" | per API schedule | R3 | BTC / Premium |
APPLICATIONS & INDUSTRIES
Where these tubes get used.
High-pressure high-temperature wells requiring premium connections and high-yield casing.
MATERIAL GRADES
J55 through Q125.
SURFACE
J55 · K55
Standard grades for surface and conductor casing in shallow to mid-depth wells.
INTERMEDIATE
N80 · L80
Intermediate and production casing — L80 for sour service per NACE MR0175.
DEEP / HP
P110 · Q125
High-collapse and high-yield grades for deep, high-pressure, and HPHT wells.
TECHNICAL ARTICLES
Latest insights on casing pipe.
ARTICLE
STC vs LTC vs BTC
Choosing the right threaded connection for your casing string.
ARTICLE
Collapse Resistance
Why collapse rating matters and how grade selection affects it.
RELATED PRODUCTS
Often paired with.
GET A QUOTE
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OD, weight, grade, connection, range, quantity — we revert with a technical & commercial proposal.