Yantai Yunsheng Petroleum Machine Accessories Co., Ltd produce API approved sucker rod couplings, including Spray Metal sucker rod coupling, calss T sucker rod coupling, Sub sucker rod coupling, Full size sucker rod coupling and Slim Hole sucker rod coupling, with the size range of 5/8", 3/4", 7/8", 1" 1-1/8". Materials is AISI 5140.

All of our products are excellent in quality and low in price, which satisfied many of our customers home and overseas, with API Spec 11B certificate and the reliable supplier you can trust in China.

API 3/4” Class SM Full Size Sucker Rod Coupling

 1) Material: AISI 5140

 2) Standard: API Spec 11B

 3) Main specification:

   OD:1-5/8" (41.28mm)

   ID: 1-1/16"(26.99mm)

   Length: 4" (101.6mm)

   Weight: 0.60kg

 4)Other Size: 5/8”; 7/8”;1”; 1-1/8"

5)Smoothness: 3.1*10-3

 6)Coat Thickness(in): 0.01in ~ 0.02in

 7)Basic hardness: HRC 16-23

 8)Surface Hardness: HRC 55-62

 9)Bonding Strength(Mpa): 484

 10)Hole rate: <2%

 11)Min. Hardness of the layer: 595HV0.2

 12)Min. Tensile Strength: 655 Mpa

 13)Operating Temperature: -1000~400 Centigrade Temperature

 14)Life: > 180 days

 15) Package: wooden case, 1000pcs each case.

 16) Usage: oil exploration equipment, accessories, oil sucker rod coupling 

For more information, please do not hesitate to contact me.

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.