Manufacturing specification: API 11B
Material
1. Chemical Composition
The material shall be per manufacturer’s specification and shall have a maximum sulfur content of 0.05%.
2. Mechanical Properties
Mechanical properties shall be in accordance with the manufacturer’s specification with a minimum tensile strength of 95,000psi(655MPa). One of the following means shall be used to conform to the tensile requirements:
---determination of the metal material hardness of 56 to 62 HRA inclusive; or
---material test report per 6.3.2.2 for the heat of steel from the original mill if further processing does not change mechanical properties; or
---a tensile test per ASTM A370, OR ISO 6892 with s minimum of two tests performed after final thermal

* They are available in reduced slim hole (SH) diameters as well as normal full size (FS) for both API Class T(through-hardened) and Class SM (Spray Metal).

3/4" 7/8" 1" T Sucker Rod Coupling SM SH FS Coupling packing 

Puyang Zhongshi Group Company Ltd was founded in 1996,which is the restructured enterprise of Central Plains oilfield branch company of SINOPEC . The company registered capital is 6083 million yuan,with annual output value 200 million yuan, 580 employees, including more than 160 technical and administrative staff. Oil machinery is our main products, the leading products include Pumping Unit,Subsurface Sucker Rod Pump, wellhead (Christmas Tree), pressure vessels,drilling solid control series products and Cementing Accessories, We had attained ISO 9001 in 1998 and API Certificates in 2002 .

We have 9 factories, more than 500 employees, and many kinds of production equipments.
We have certificates of API 5CT,6A,10D,11AX,11E, ISO 14001 and 9001.
With 10 years exporting experience,we have exported to more than 30 countries such as America,Canada,Russia,Venezuela,Columbia,Thailand,Indonesia ,UAE,Saudi Arabia,Kazakhstan etc.

All products purchased in our company are guaranteed to keep in good repair for one year. If quality problems happen in guarantee period, our company will maintain for free. Additionally, our company provides technical support and fittings for life. After-sales service isn't restricted by time and we will assign technical personnel to solve your problems immediately after receiving telephone and hear feedback idea of users and deal with them in time. If you are caught in some problems when using our products, welcome to contact us at any time.

Tina Chen