Two-way globoidal protection SM Coupling,API 11B
Grade SM, DIA: 5/8"~1-1/8". be used to vertical wells and inclined shafts.

In total,we have two types of coupling are available which meet API Specifications: regular API Class T coupling and spray metal coupling for anti corrosion. Dimensions and tolerances conform to API Specification 11B.

We produce the whole API sucker rod coupling line, including sucker rod coupling, subcoupling, polished rod coupling,slim hole(SH) coupling,class SM coupling. Spraying Metal coupling combines top quality steel with a cold rolled thread that increase fatigue resistance. Our T and SM coupling are manufactured from high quality steel pipe in accord with API standard.

This is API Coupling, class SM,  

1)Material: seamless alloy steel
2)Standard: API Spec 11B
3)Grade SM, Fullsize or slimehole
4)coupling diameter: 5/8"~1-1/8"

Product introduction:

The Internal chamber in the main body of the coupling is continuous internal thread,the middle shape of the main body just like a croquet mallet. The middle of the outside body is cambered outwards and makes perfect arc line. Its outer appearance is a hyperbolid of revolution. On both sides of symmetry, and all by customers different requirements, in the middle position has a ride wrench groove,or has not.

Beneficial effects are:

 to be effectively slow up the eccentric wear problem of the pumping well pipe rod, which can effectively protect and centralize the sucker rod,and make the sucker rod coupling successfully contact with the tubing camber;To reduce the friction between the rod and coupling,and extend the exemption period of the oil well; It can be used to vertical wells and inclined shafts.