Specification :

Yantai Yunsheng Petroleum Machine Accessories, Co., Ltd , funded in 1997, presently is one of biggest enterprises producing double protection sucker rod couplings inside China. We now have more than 10 production lines then we can supply 20000 pcs SM sucker rod coupling per month.
All of our couplings including API Class T Sucker Rod Couplings, API spray metal sucker rod couplings and API Change-Over Sucker Rod Couplings are made full in line with API SPEC 11B, with the size range of 5/ 8� , 3/ 4� , 7/ 8� , 1� , 1-1/ 8� .

Paramater of coupling perfomance
1" * 1-1/ 8" FS API Sub coupling
1 Type: T& SM
2 Coupling diameter: 1" * 1-1/ 8"
-O.D: 2-3/ 8" [ 60.33mm]
-Length: 5" [ 127mm]
3 ) Weight 1.56KG/ Pcs
4 Material: AISI 5I40
5 SM Coupling Spray Material Ni60A Alloy Coating
6) Basic Hardness: HRC 16-23
7 SM Coupling Surface Hardness: HRC 55-62
8 SM Coupling Coat Thickness( in) : 0.01in ~ 0.02in
9 SM Coupling Hole rate:  2%
10 SM Coupling Min. Hardness of the layer: 595HV0.2
11) Operating Temperature: -1000~ 400
12) Life: Class SM Sub Coupling > 180 days;
Class T Sub Coupling > 90 days
13 Standard: API Spec 11B
14) Package: wooden case
15) Payment Terms: T/ T

Our New Products
1) Full Size SM Coupling with great bevel edge
2) Two-way Cambered Protection SM Coupling
If you have any interest in our sucker rod couplings, please do not hesitate to let we know, and we’ ll supply you with our high quality products and best services.