Yantai Yunsheng Petroleum Machine Accessories Co.,Ltd. produce API approved sucker rod couplings, including Class SM couplings, Class T couplings, Full size couplings and Slim Hole Couplings with the size range of 5/8", 3/4", 7/8", 1" 1-1/8". The basic materials of the couplings is AISI 5140. And the coat layer is Ni60 alloy powder.

All of our products are excellent in quality and low in price, which satisfied many of our customers home and abroad. We also have the API Spec 11B certificate, so we are the reliable supplier you can trust in China.

API Class SM Full Size Sucker Rod Coupling

  1) Material: AISI 5140

  2) Standard: API Spec 11B
  3) Size: 5/8",3/4", 7/8", 1", 1-1/8"
 4)Smoothness: 3.1×10-3
 5)Coat Thickness(in): 0.01in ~ 0.02in
 6)Basic hardness: HRC 16-23
 7)Surface Hardness: HRC 55-62
 8)Bonding Strength(Mpa): 484
 9)Hole rate: <2%
 10)Min. Hardness of the layer: 595HV0.2
 11)Min. Tensile Strength: 655 Mpa
 12)Operating Temperature: -1000~400
 13)Life: > 180 days
14) Package: Wooden Case

For more information, please contact me at any time.

Yantai Yunsheng Petroleum Machine Accessories Co. Ltd., founded in 2005, is a professional manufacturer of API Spec 11B Sucker Rod Couplings, including Spray Metal coupling, class T coupling, Sub OD coupling, with various type of Full size, Slim Hole, Over Size, with Big Chamfer, with Wrench Flat, with Bidirectional Cambered Surface Protection, etc., and the thread size are available at 5/8", 3/4", 7/8", 1", 1-1/8".  Owning world top level equipments and technicians, the monthly production capacity is more than 20,000pcs.  All of our couplings are excellent in Quality and reasonable in Price, and the production & inspection are being done fully in accordance with API Spec11B standard.