Specification :

Yantai Yunsheng Petroleum Machine Accessories, Co., Ltd , funded in 1997, presently is one of biggest enterprises producing double protection sucker rod joint inside China. Our company has fixed assets RMB 10, 000, 000.00 yuan, 150 employees, among them there are 26 engineers. It covers 30000 square metres, and construction area is 15000 square metres.
We own the advanced technology, especially about the alloy coat abrasion-proof sucker rod joint is on top level of the world. The products earned the good reputation from domestic clients such as Shengli Oil Field and Daqing Oil Field, also having sold into the markets of Europe, Southeast Asia and Middle East. Moreover, our company have past the attestation of ISO9001: 2000 and API SPEC 11B Certifications and become Alibaba gold supplier of various sucker rod couplings.
Paramater of coupling perfomance
3/ 4" * 7/ 8" FS API Sub coupling
1 Type: T& SM
2 Material: Carbon steel AISI 5I40 or AISI 4135
3 SM Coupling Spray Material Ni60A Alloy Coating
4) Basic Hardness: HRC 16-23
5 SM Coupling Surface Hardness: HRC 55-62
6 SM Coupling Coat Thickness( in) : 0.01in ~ 0.02in
7 SM Coupling Hole rate:  2%
8 SM Coupling Min. Hardness of the layer: 595HV0.2
9 Standard: API Spec 11B
10 Coupling diameter: 3/ 4" * 7/ 8"
11) Weight: 0.92 KG/ Pcs
12) Package: wooden case
13) Payment Terms: T/ T