API Specification 5CT; API Specification 5B

Casing and Tubing Couplings

Name: Casing and Tubing Couplings
Brand: Tsingshan Steel (Shandong)
SKU: casing-and-tubing-coupling

OCTG casing and tubing couplings matched to the ordered pipe standard, nominal size, grade, connection, thread form, dimensions, inspection, marking, protection, quantity, and service conditions before commercial review. Compatibility is checked against the matching pipe order and exact thread designation.

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PRODUCT ORDER SPECIFICATION CONFIRM FOR QUOTATION

KEY SPECIFICATIONS

Standard: API Specification 5CT; API Specification 5B
Nominal size: Nominal size matched to the parent pipe or assembly; confirm on quotation/PO.
Connection: Exact thread or connection designation and governing standard; confirm compatibility on PO.
Product: Casing and Tubing Couplings

Technical classification

Material / substrate: Carbon Steel
Form: Fitting
Application: Oil & Gas

Product specifications

Send grade, standard, dimensions, and delivery requirements for a matched product quotation.

Product specifications
Property	Value
Product identity
Product	Casing and Tubing Couplings
Material	Carbon Steel
Product form	Fitting
Standards and classification
Standard	API Specification 5CT; API Specification 5B
Dimensions
Nominal size	Nominal size matched to the parent pipe or assembly; confirm on quotation/PO.
Process and connections
Connection	Exact thread or connection designation and governing standard; confirm compatibility on PO.

Overview

A casing or tubing coupling is a threaded OCTG connection component matched to the pipe it joins. It is not specified by straight-pipe outside diameter and wall thickness alone, and it does not use an ASME flange pressure class. The RFQ should identify casing or tubing service, API Specification 5CT edition, nominal pipe size, matched grade, coupling type, and thread connection. API tubing references include EUE and NUE, while casing references include STC, LTC, and BTC where applicable. Proprietary or premium connections need the exact licensed designation, drawing, and inspection criteria. Buyers should state full-length or special-clearance requirements, dimensions, thread inspection, surface treatment, marking, thread protection, quantity, and service conditions. Compatibility with the ordered pipe and connection must be confirmed before release.

Product scope

Couplings are treated as OCTG fittings matched to casing or tubing, not as straight pipe.
Nominal size and connection replace the former generic OD and wall template.
ASME pressure class is not used as the default coupling specification field.

Applications

API casing-string connections
API tubing-string connections
Replacement coupling orders matched to existing pipe and thread data

Surface options

Surface treatment stated by the order
Thread compound and protectors specified for storage and shipment

Processing & form

API thread form by exact designation
Proprietary connection only to an approved drawing and inspection plan

RFQ documents & delivery

Packing, MTC, and inspection path — include them in your RFQ for an actionable quote.

Packing & delivery

Export packing options

Packing is defined after product form, dimensions, unit weight, handling method, storage exposure, and destination are known. The final offer must state the approved packing method.

Quality assurance

Quality documents

Inspection and documents follow the governing standard and accepted purchase order. Reference standards on this page do not confirm a grade, size, test, or certificate as available.

FAQ

What should the RFQ for Casing and Tubing Couplings include?

State Casing or tubing service and API 5CT edition, Nominal pipe size and matched grade, Coupling type and exact connection, API or proprietary thread designation, Inspection, marking, surface, and thread protection, Quantity, service conditions, and destination. Technical availability is confirmed only after the complete order basis is reviewed.

Do reference standards confirm available grades and sizes?

No. A reference standard defines the product and test basis. Grade, size, processing, testing, documents, and shipment availability remain order-specific until confirmed in the offer.

What information is needed to quote Casing and Tubing Couplings?

Send the required grade or standard, dimensions, quantity, destination port and application. Add surface, processing, packing or inspection requirements when they affect the order.

How should I select the grade or standard for Casing and Tubing Couplings?

Use the project specification and end use as the starting point. Share any required reference such as API Specification 5CT, API Specification 5B, together with forming, welding, corrosion or service conditions, so the quotation follows the intended application.

What affects the quotation for Casing and Tubing Couplings?

The material specification, dimensions, quantity, processing, surface, packing and destination all affect the quotation. Final commercial terms are provided against the submitted RFQ.

How is Casing and Tubing Couplings prepared for sea shipment?

Packing is selected for the Fitting form, dimensions, handling method and shipping route. State any pallet, bundle, coil orientation, moisture protection or marking requirements in the RFQ.

Request a quote for Casing And Tubing Coupling

Send the complete Casing and Tubing Couplings order basis, quantity, inspection scope, and destination for technical review.

Request a Quote Check details on WhatsApp

RFQ form: itemized quote, MTC and packing requirements
WhatsApp: quick check of specifications, quantity and port