Made full accordance with API SPEC 11B, the couplings are high in quality and low in price. The basic material is AISI 5140.

1.API Class T Full Size sucker rod coupling
 1)Material: Seamless Alloy Steel 40Cr (AISI 5140)
2)Standard: API Spec 11B 
3)Size: 5/8"; 3/4"; 7/8"; 1"; 1-1/8"
4)Features: The Class T coupling is manufactured with a through hardness of between 16 and 23 Rc. This result in high tensile and fatigue strengh for the coupling. The outside diameter is smooth to minimize stress concerntrations, and an accurate chamfer allows for controlled contact stress. The threads are rolled full form which results in compressive stresses at the thread root and improved fatigue resistance.

2. API Class T Slim Hole sucker rod coupling
1)Material: Seamless Alloy Steel 40Cr (AISI 5140)
2)Standard: API Spec 11B 
3)Size: 5/8"; 3/4"; 7/8"; 1"; 1-1/8"
4)Features: The Class T coupling is manufactured with a through hardness of between 16 and 23 Rc. This result in high tensile and fatigue strengh for the coupling. The outside diameter is smooth to minimize stress concerntrations, and an accurate chamfer allows for controlled contact stress. The threads are rolled full form which results in compressive stresses at the thread root and improved fatigue resistance.

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

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