Import Drill Subs — Buy in Bulk from Supplier in China

Drill subs from Dongying Lake Petroleum Technology Co., Ltd are threaded connection components designed to join sections of drill pipe in oil, gas, and geothermal drilling operations. They are manufactured to meet API Spec 7-1 standards for threaded connections and are available in BOX x BOX, BOX x PIN, and PIN x PIN configurations. These subs provide structural continuity and fluid pathway integrity between drill pipe sections under high torque and axial loads.

The subs are forged from low-alloy steel such as 35CrMo or 4145H, with heat treatment to achieve a minimum yield strength of 860 MPa and tensile strength of 965 MPa. Thread profiles conform to API 7-1 Class 2 or Class 3, with full profile and full range threads. Surface treatments include phosphating or zinc-nickel plating for corrosion resistance in sour environments. Dimensional tolerances for thread runout are ±0.15 mm, and concentricity is held within 0.05 mm over the full length.

These subs are used by drilling contractors in the Middle East, Southeast Asia, and North America for both onshore and offshore applications. Buyers require consistent thread geometry and material traceability to ensure compliance with well control regulations. Trade terms are typically FOB Qingdao or CIF destination, with MOQs negotiable based on configuration. Packaging is in steel-reinforced wooden crates with corrosion inhibitors, and lead time ranges from 30 to 45 days depending on order volume.

Dongying Lake Petroleum Technology Co., Ltd is located in Dongying, Shandong Province, China, and specializes in the production of downhole drilling components, including drill subs, stabilizers, and heavy weight drill pipes. The company operates a forging and machining facility with CNC lathes and thread rolling machines. The supplier does not publish certifications, workforce size, or annual revenue. Their profile indicates focus on API-compliant products but does not confirm ISO or API monogram licensing.

They are listed as an 'imported' tier supplier, suggesting they export regularly but lack formal platform verification signals. No client names, project references, or third-party audit reports are disclosed. Their product descriptions emphasize API compliance and customization, but no test reports or material traceability details are provided. Their value lies in production capacity and configurability, not documented quality systems.