API SPEC 11B Sucker Rod Couplings, Class SM

Made in accordance with API standard, the couplings are high in quality and low in price. The basic material is AISI 5140.
Yunsheng is the professional manufacturer of API sucker rod couplings and has been in this business for many years.

We got the API certifivate on June 1, 2009. The couplings have been exported to many countries and enjoy high reputation from our customer.

3.API Class SM Full Size sucker rod coupling
7/8"Full Size Spray Metal Sucker Rod Coupling
1) Material: Seamless Alloy Steel 40Cr (AISI 5140)
2) Standard: API Spec 11B
3) Main specification:
OD:1-13/16" (46.04mm)
ID: 1-3/16"(30.16mm)
Length: 4" (101.6mm)
Weight: 0.74kg
4)Smoothness: 3.1*10-3
5)Coat Thickness(in): 0.01in ~ 0.02in
6)Basic hardness: HRC 16-23
7)Surface Hardness: HRA 58-62
8)Intergrate intension(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 centigrade
13)Life: > 180 days
14) Package: wooden case, 1000pcs each case.
15) Usage: oil exploration equipment, accessories, oil sucker rod coupling

4. API Class SM Slim Hole sucker rod coupling
7/8" Slim Hole Spray Metal Sucker Rod Coupling
1) Material: Seamless Alloy Steel 40Cr (AISI 5140)
2) Standard: API Spec 11B
3) Main specification:
OD:1 5/8" (41.3mm)
ID: 1 3/16"(30.16mm)
Length: 4" (101.6mm)
Weight: 0.52kg
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)Intergrate intension(Mpa): 484
9)Hole rate: <2%
10)Min. Hardness of the layer: 595HV0.2
11)Min. Tensile Strength: 655 Mpa
12)Operating Temperature: -1000°C~400°C
13)Life: > 180 days

For more information please do not hesttate to contact me.