Yantai Yunsheng Petroleum Machine Accessories Co., Ltd, founded in 1997, is a modern high-tech enterprise and specialize in manufacturing sucker rod couplings. We have advanced produce lines and the monthly output of the coupling can reach 20,000pcs. Our company is one of the API Spec 11B proved compamies. Now we mainly supply two kinds of sucker rod couplingregular API class T sucker rod coupling and API class SM sucker rod coupling, both of the two kinds are available in full size and slim hole with the size range of 5/8";3/4";7/8";1";1-1/8".

1" API class SM full size sucker rod couplings

 1) Material: AISI 5140
 2) Standard: API Spec 11B
 3) Main specification:
       OD:2-3/16" (55.56mm)
       ID: 1-3/8"(34.93mm)
       Length: 4" (101.6mm)
       Weight: 1.13kg
 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

OUR NEW SPECIAL PRODUCTS
Both-way Protection Globoidal Sucker Rod Coupling

Full Size Spray Metal Coupling with Big Chamfer

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.