Yunsheng founded in 1997 is the manufacturer of API sucker rod coupling in Shandong China with all the rod coupling produced by API 11 B standard and is also one of ISO qualified international supplier. With more than ten years' experience in oilfields, we offer a complete range of API sucker rod and couplings. We have 20 production lines, and can offer 3,0000 pieces each month. Yunsheng has set an industry standard with the design of the Premier Performance Sucker Rod couplings including both API Class T (through hard) and API Class SM (spray metal) designs. These sucker rod coupling are very cost effective, including class SM sucker rod coupling, class T sucker rod coupling, Sub sucker rod coupling, Full Size coupling, Slim Hole coupling. They are available in 5/8”, 3/4”, 7/8”, 1” and 1-1/8”. Manufactured with high quality Carbon steel AISI 5I40 /4135.
