Knowledge Center

Technical guides for buyers

Written for procurement engineers: what the products are, which standards and HS codes apply, and how to send an RFQ that gets a fast, accurate quotation. No filler.

Oilfield Drilling Tools

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Sourcing from China

Jul 18, 2026

How to Buy API 7-1 Drill Collars from China

A practical sourcing guide: what API Spec 7-1 covers, how to qualify a Chinese drill collar manufacturer, which documents to demand, and the exact information to put in your RFQ.

Product Explainers

Jul 18, 2026

What Is a Non-Magnetic Drill Collar?

What a non-magnetic drill collar does in the BHA, why P550 austenitic steel is used, how magnetic permeability is verified, and what to include in an RFQ.

Export & Cross-Family Guides

HS Codes & Export

Jul 18, 2026

HS Codes for Oilfield Tools, Pipe Molds and Rolling Mill Parts

The HS classifications buyers actually use: 8431.43 for drill collars and stabilizers, 8480.49 for DI pipe molds, 8455.30/8455.90 for mill rolls and spares, and 8483.10 for forged shafts — with the reasoning behind each.

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