1. API SPEC 11B 2. BASIC MATERIAL: AISI 5140 COAT LAYER: NI60A 3.USED TO CONNECT THE SUCKER ROD FOR OIL EXTRACTION Yantai Yunsheng Petroleun Machine Accessories Co., Ltd. has been specialized in manufacturing sucker rod couplings for over ten years.We obtained the API SPEC 11B certificate on June 1, 2009. Since then, we have exported our couplings to America, Peru, Argentina, Kuwait, India, ...
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