What products does API 5CT cover?

Primarily casing, tubing, pup joints, couplings, and related accessory or coupling-stock materials under the licensed facility scope.

How do I verify an API 5CT monogram or certificate claim?

Open https://mycerts.api.org/search/compositesearch, search by company name, license number, or API 5CT, and confirm Active status plus facility and scope match the quote.

What does “Certification records” on Dongying Zhizao mean?

Public source-record chips that help buyers filter supplier cards. They are not live confirmation of API license status.

What should I include in an RFQ for casing or tubing?

OD/wall/length, grade, connection, quantity, delivery, inspection, mill docs, and the facility/license you expect on the Composite List.

ابحث عن المورّدين / التوريد حسب سلسلة قيمة النفط والغاز

API 5CT · Suppliers

Find supplier source records for API 5CT. Source labels do not replace issuer verification; scope remains facility-specific.

عبارات توريد شائعةpackers sucker rods BOP Christmas tree OCTG top drive

0مورّدون موثّقون

50سجلات مصادر API / ISO

144منتجات مُدرجة

What is API Spec 5CT?

API Spec 5CT is the American Petroleum Institute specification for steel casing, tubing, pup joints, couplings, and related tubular materials used in oil and gas wells. It sets requirements for grades, dimensions, mechanical properties, inspection, marking, and related manufacturing controls. Manufacturers may hold an API Monogram license for Spec 5CT for a defined facility and product scope; buyers should confirm current status on the قائمة API Composite List.

Grades buyers commonly RFQ

Illustrative (not exhaustive): J55, K55, N80, L80, P110, Q125. Confirm edition and supplementary requirements with the seller. The 11th edition of Spec 5CT was published December 2023; Addendum 1 was published May 2025 — check the current Spec rather than outdated PSL framing.

Related standards on this site

API 5B — threading / gauging related to OCTG
API Q1 — quality-management system registration (not a product monogram by itself)
أنابيب OCTG والمواد category hub

How to verify an API 5CT claim (before you RFQ)

Open mycerts.api.org Composite List search.
Search by company legal name, license / certificate number, or specification (API 5CT).
Confirm ساري status, facility address, and licensed scope match the quotation and shipping plant.
If status is suspended, cancelled, or applicant-only, do not treat it as authorized monogram use.

Monogram vs Q1 vs this site’s “Certification records”

An API Monogram license is facility- and product-spec-specific. API Spec Q1 is a QMS registration. Dongying Zhizao “Certification records” are public source-record chips for navigation — they are not live issuer verification. No match on this site also does not prove a facility has no certificate. Full steps: How to verify an API certificate before you RFQ.

Typical buyer fields (illustrative)

Illustrative examples for RFQ drafting only — confirm edition, grade, connection and mill capability with the supplier. Not a claim that any listed firm offers every row.

Field	Illustrative values	Notes
OD / size	e.g. 2-3/8″–13-3/8″ tubing/casing range	Confirm available OD × wall with mill
Grade	J55, K55, N80, L80, P110, Q125 (examples)	Confirm Spec edition + SR; not exhaustive
Connection / thread	API LTC / STC / BTC; premium as quoted	Often paired with API 5B threading scope
Length range	Range 1–3 / pup joints as specified	State preferred length and end finish

What to put in an API 5CT RFQ

OD / wall / length; grade; connection / thread
Quantity and delivery window; destination / Incoterms
Inspection (NDT, hydro); marking / monogram expectation; mill test docs
License number and facility address you expect to appear on the Composite List

Use the bulk RFQ on this page or open a supplier profile #rfq. Playbook: How to source oilfield equipment from Dongying.

FAQ

What is API Spec 5CT?: API Spec 5CT covers steel casing, tubing, pup joints, couplings, and related tubular materials for oil and gas wells, including grades, dimensions, inspection, and marking. Confirm any Monogram license on the API Composite List.
What products does API 5CT cover?: Primarily casing, tubing, pup joints, couplings, and related accessory / coupling-stock materials under the licensed facility scope.
How do I verify an API 5CT monogram or certificate claim?: Search the official Composite List, confirm Active status plus facility and scope match, then RFQ. Directory labels here do not replace issuer checks.
What does “Certification records” on Dongying Zhizao mean?: Public archive chips used to filter supplier cards. They are not a live confirmation of API license status.
What should I include in an RFQ for casing or tubing?: Size, grade, connection, qty, delivery, inspection, docs, and the facility/license you expect on the Composite List.

ابحث عن المورّدين

Six Dongying source-record matches shown below; always re-check the Composite List before RFQ.

6 من النتائج

التسميات تعكس سجلات شهادات علنية لا تحققًا حيًا لدى الجهة المُصدِرة. غياب المطابقة لا يعني غياب الشهادة. ابحث بمعيار API أو رقم الشهادة. Retrieved: 2026-10-22

لم يُكمل أي مورّد تحقق التجمع بعد. مطابقة المصادر لا تمنح التحقق؛ يمكن لمكتب التوريد استلام المتطلبات.

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