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API 5CT and ISO 11960 Buyer Guide
API 5CT and ISO 11960 provide the product framework for casing, tubing, coupling stock, couplings and selected accessories. A compliant enquiry still needs the applicable edition, complete product designation, connection and purchaser requirements.
Define the product line item
The standard reference is the starting point; size alone is not a purchase description.
- Casing, tubing, coupling stock or finished coupling
- Outside diameter and nominal mass or wall thickness
- Grade, product condition and required length range
- Quantity, end condition and matching components
Specify the connection separately
Thread geometry, clearance and mating compatibility must be stated with the parent tubular.
- API thread form under the applicable API 5B basis
- STC, LTC or BTC casing connection as required
- NUE or EUE tubing connection as required
- Premium or proprietary connection only with authorization and controlled data
Connect grade to service
Grade selection must reflect loads, temperature, produced fluids and the complete service environment—not strength alone.
- Mechanical-property and heat-treatment family
- H₂S, CO₂, chlorides and water phase
- Hardness or supplementary testing when specified
- Design-authority approval for substitutions or severe service
Fix inspection and evidence before release
The agreed inspection plan should identify the checks, acceptance basis and records required for the actual product form.
- Material and heat / lot traceability
- Dimensions, drift and thread gauging
- NDT, pressure or supplementary tests when applicable
- MTC, inspection reports, marking, protection and final dossier
ENQUIRY CHECKLIST
Information to prepare.
Use this list as an initial procurement guide. The governing design and purchase documents remain authoritative.
Send Your Requirement- 01Product type and governing edition
- 02Size, nominal mass / wall, grade and length
- 03Complete connection and coupling designation
- 04Well duty and service environment
- 05Purchaser clauses and supplementary tests
- 06Inspection, documents, packing and destination