Dongying ZhizaoMade-in-Dongying directory

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OCTG & Materials

Shortlist Dongying OCTG and tubular-materials makers. Use this hub with the API 5CT suppliers page, then verify Monogram status on the Composite List before RFQ.

Popular sourcing termspackerssucker rodsBOPChristmas treeOCTGtop drive
0Verified suppliers
50API / ISO source records
144Listed products
AllCasing & tubing 172Drill pipe & collars 5Line pipe & coatings 9Precision castings & seals 3

OCTG & materials suppliers in Dongying

This hub lists Dongying manufacturer profiles tagged to OCTG and related materials — casing, tubing, and associated tubular products buyers typically RFQ alongside Spec 5CT grades and connections. Shortlist here, then open the API 5CT · Suppliers hub and verify licenses on the API Composite List before committing.

Directory counts are mappings only. “Certification records” chips are navigational source archives, not live issuer status.

Related hubs

Spec → product family map (illustrative)

Illustrative mapping for RFQ drafting only — confirm Spec edition, facility scope and mill capability with the supplier. Not a claim that any listed firm covers every row or product family.

API SpecTypical product familiesNotes for buyers
API 5CTCasing, tubing, pup joints, couplingsConfirm OD × wall, grade, connection; verify Monogram on Composite List
API 5BThreading / gauging for OCTG connectionsOften paired with 5CT connection / thread scope on the quote
API 5LLine pipe (adjacent tubular RFQs)Pipeline / gathering RFQs — distinct from well OCTG under 5CT

What to put in an OCTG RFQ

Bulk RFQ response target ~24h (not a contractual SLA). Verify playbook: How to verify an API certificate before you RFQ.

FAQ

What is the OCTG & Materials category on Dongying Zhizao?
A Dongying directory slice for oil country tubular goods and related materials, linked to standards hubs such as API 5CT.
What is API 5CT and why does this hub link it?
Spec 5CT covers casing, tubing, pup joints, couplings and related tubulars; many OCTG RFQs reference it. Verify Monogram status on the Composite List.
What should an OCTG RFQ include?
Size, grade, connection, qty, delivery, inspection, docs, and expected Composite List facility/license.
Are “Certification records” the same as an active API license?
No — they are navigational chips only.

Find suppliers

178 related · 12 primary

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Labels reflect public certificate records, not current issuer verification. No match does not mean no certificate. Search by API standard or certificate number. Retrieved: 2026-10-22

No suppliers have completed cluster verification yet. Source matches do not confer verification; the sourcing desk can receive requirements.

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Comparison shows listed business information; it is not certification or endorsement.

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RFQ response target ~24h (not a contractual SLA)

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