Import Api 3/4"*7/8" Sub Sucker Rod Couplings — Buy in Bulk from Supplier in China

API 3/4"*7/8" sub sucker rod couplings are precision-engineered connectors for oilfield sucker rod strings, designed to meet API 11B specifications. These couplings feature a threaded internal bore matching the pin ends of sucker rods, with a 3/4 inch to 7/8 inch size transition to accommodate tapered rod strings. The design ensures a secure, leak-proof connection under high cyclic loads in downhole environments, with material typically conforming to API modified grade steel for corrosion resistance and fatigue strength.

The couplings are manufactured with tight dimensional tolerances to maintain alignment and reduce stress concentrations during operation. Standard industry practice includes heat treatment to achieve a hardness range of 23-35 HRC, with surface finishes that minimize thread galling. Typical coatings include phosphate or zinc plating for temporary corrosion protection during storage and handling. Buyers should note that while these are standard treatments, the exact process may vary by batch and should be confirmed with the supplier.

These couplings are primarily used in artificial lift systems for onshore and offshore oil wells, where sucker rod pumps require reliable connections to transmit power from the surface to the downhole pump. Common buyers include oilfield service companies, drilling contractors, and equipment distributors. For bulk orders, packaging typically consists of wooden crates or pallets with waterproof wrapping to prevent damage during transit. Lead times and shipping terms should be verified directly with Yantai Yunsheng Petroleum Machine Accessories Co., Ltd, as these depend on current production schedules and port availability.

Yantai Yunsheng Petroleum Machine Accessories Co., Ltd is based in Shengquan Industrial Park, Yantai, Shandong Province, China. The company specializes in manufacturing components for the oil and gas industry, with a focus on sucker rod couplings and related downhole equipment. Its facility is located at Dongxing Road, a region known for industrial manufacturing, particularly for petroleum machinery.

The supplier operates as an imported-tier provider with a harbor trust tier, indicating established credentials in international trade. While the response rate is currently unrecorded, the company’s address and industrial park location suggest a dedicated manufacturing setup. The profile does not specify production capacity, certifications beyond API compliance, or client references, so buyers are advised to request these details directly.