China supplier API 11b Class T and Class Sm Sucker Rod Coupling coupling brass

Product Description

Product Description

JX Petro sucker rod couplings, polished rod couplings and sub-couplings are engineered and designed to meet the challenges existing in today’s rod-pumped applications. They are available in API Class T or SM, and in all Sucker rod sizes. JX Petro.  couplings are manufactured from special quality cold-formed steel extrusions or cold drawn seamless mechanical steel tubing. Sucker rod couplings, polished rod couplings and sub-couplings are available in full size, slimhole or oversize outside diameters with effective-width Enhanced Contact Face (ECF) designs.

The main types of sucker rod couplings are sucker rod couplings, polished rod couplings and sub-couplings.

  1. Sucker rod couplings has same box thread size in both end.
  2. The polished couplings are designed to connecting polished rod and sinker bars.
  3. The sub-coupling is also called cross over coupling. It has different box thread size in both end.

Sucker rod coupling has same box thread size in both end.

Sub-coupling has different box thread size in each end.

Polished rod coupling has same box thread and vanish cone in both end.
All of the 3 types have 2 classes: class T and class SM.

  1. The class T stands for Through-hardened.
  2. The class SM stands for sprayed metal.

The outer diameter of the sucker rod couplings has full size and slim hole types..

  1. Material: high quality carbon steel or alloy steel. (AISI 1045, AISI 4135).
  2. Thread size: 5/8″, 3/4″, 7/8″, 1″ and 1-1/8″.
  3. Length: 4″, 4.5″ and 5″.
  4. Grade: T and SM.
  5. Type: sucker rod coupling, polished coupling and sub-coupling.


  1. Good corrosion and wear resistance.
  2. Black oxide coated for anti-galling and lubricating properties.
  3. Automatic flame spray production minimize the tolerance.


  1. The sucker rod couplings are widely used in the oil industries for connection for sucker rod, polished rod, pony rod and sinker bars.
  2. The sucker rod couplings are used for connecting the sucker rod and sinker bars with the same dimensions. But it is not used in the polished rods, which may cause the fracture of the couplings.
  3. The polished couplings are designed to connect the polished rod and sinker bars.
  4. The sub-coupling is widely used for the connection of different sizes of sucker rod, pony rod and sinker bars

Sucker rod couplings specification

Spec Internal thread spec Length Outside diameter
Full size Slim hole
5/8″ 15/16″ 4″ 38.1mm 31.8mm
3/4″ 1-1/16″ 4″ 41.3mm 38.1mm
7/8″ 1-3/16″ 4″ 46mm 41.3mm
1″ 1-3/8″ 4″ 55.6mm 50.8mm
1-1/8″ 1-9/16″ 4.5″ 60.33mm N/M

Sub-couplings specifications

Spec Internal thread spec Length Outside diameter
Small end Big end Full size Slim hole
5/8″ × 3/4″ 15/16″ 1-1/16″ 4″ 41.3mm 38.1mm
3/4″ × 7/8″ 1-1/16″ 1-3/16″ 4″ 46mm 41.3mm
7/8″ × 1″ 1-3/16″ 1-3/8″ 4.5″ 55.6mm 50.8mm
1″ × 1-1/8″ 1-3/8″ 1-9/16″ 5″ 60.3mm N/M

Polished rod couplings

Spec Internal Thread Spec Length Outside Diameter Vanish Cone
Full Size Slim Hole
5/8″ 15/16″ 4″ 38.1mm 31.8mm
3/4″ 1-1/16″ 4″ 41.3mm 38.1mm
7/8″ 1-3/16″ 4″ 46mm 41.3mm
1″ 1-3/8″ 4″ 55.6mm 50.8mm
1-1/8″ 1-9/16″ 4.5″ 60.3mm N/M


  1. The sucker rod couplings have 2 type of package.
  2. In plastic paper and carton.
  3. In wooden box.

Hot Sales Products

Company Profile

Packaging & Shipping


1) How can I place order?

A: You can contact us by email about your order details, or place order on line.

2) How can I pay you?

A: After you confirm our PI, we will request you to pay. T/T and Western Union are the most usual ways we are using.

3) What’s the order procedure?

A: First we discuss order details, production details by email or TM. Then we issue you an PI for your confirmation. You will be requested to do pr -epaid full payment or deposit before we go into production. After we get the deposit, we start to process the order. We usually need 15-25days if we don’t have the items in stock. Before production has been finished, we will contact you for shipment details, and the balance payment. After payment has been settled, we start to prepare the shipment for you.

4)How do you take care when your clients received defective products?

A: replacement. If there are some defective items, we usually credit to our customer or replace in next shipment.

5)How do you check all the goods in the production line?

A: We have spot inspection and finished product inspection. We check the goods when they go into next step production procedure.

After-sales Service: Yes
Warranty: 1 Year
Manufacturing Process: Casting
Surface Treatment: Galvanized
Operation Pressure: Atmospheric Pressure
Material: High Quality Carbon Steel or Alloy Steel.


Customized Request


Functions and Modifications of Couplings

A coupling is a mechanical device that connects two shafts and transmits power. Its main purpose is to join two rotating pieces of equipment together, and it can also be used to allow some end movement or misalignment. There are many different types of couplings, each serving a specific purpose.


Functions of coupling are useful tools to study the dynamical interaction of systems. These functions have a wide range of applications, ranging from electrochemical processes to climate processes. The research being conducted on these functions is highly interdisciplinary, and experts from different fields are contributing to this issue. As such, this issue will be of interest to scientists and engineers in many fields, including electrical engineering, physics, and mathematics.
To ensure the proper coupling of data, coupling software must perform many essential functions. These include time interpolation and timing, and data exchange between the appropriate nodes. It should also guarantee that the time step of each model is divisible by the data exchange interval. This will ensure that the data exchange occurs at the proper times.
In addition to transferring power, couplings are also used in machinery. In general, couplings are used to join two rotating pieces. However, they can also have other functions, including compensating for misalignment, dampening axial motion, and absorbing shock. These functions determine the coupling type required.
The coupling strength can also be varied. For example, the strength of the coupling can change from negative to positive. This can affect the mode splitting width. Additionally, coupling strength is affected by fabrication imperfections. The strength of coupling can be controlled with laser non-thermal oxidation and water micro-infiltration, but these methods have limitations and are not reversible. Thus, the precise control of coupling strength remains a major challenge.


Couplings transmit power from a driver to the driven piece of equipment. The driver can be an electric motor, steam turbine, gearbox, fan, or pump. A coupling is often the weak link in a pump assembly, but replacing it is less expensive than replacing a sheared shaft.
Coupling functions have wide applications, including biomedical and electrical engineering. In this book, we review some of the most important developments and applications of coupling functions in these fields. We also discuss the future of the field and the implications of these discoveries. This is a comprehensive review of recent advances in coupling functions, and will help guide future research.
Adaptable couplings are another type of coupling. They are made up of a male and female spline in a polymeric material. They can be mounted using traditional keys, keyways, or taper bushings. For applications that require reversal, however, keyless couplings are preferable. Consider your process speed, maximum load capacity, and torque when choosing an adaptable coupling.
Coupling reactions are also used to make pharmaceutical products. These chemical reactions usually involve the joining of two chemical species. In most cases, a metal catalyst is used. The Ullmann reaction, for instance, is an important example of a hetero-coupling reaction. This reaction involves an organic halide with an organometallic compound. The result is a compound with the general formula R-M-R. Another important coupling reaction involves the Suzuki coupling, which unites two chemical species.
In engineering, couplings are mechanical devices that connect two shafts. Couplings are important because they enable the power to be transmitted from one end to the other without allowing a shaft to separate during operation. They also reduce maintenance time. Proper selection, installation, and maintenance, will reduce the amount of time needed to repair a coupling.


Maintenance of couplings is an important part of the lifecycle of your equipment. It’s important to ensure proper alignment and lubrication to keep them running smoothly. Inspecting your equipment for signs of wear can help you identify problems before they cause downtime. For instance, improper alignment can lead to uneven wear of the coupling’s hubs and grids. It can also cause the coupling to bind when you rotate the shaft manually. Proper maintenance will extend the life of your coupling.
Couplings should be inspected frequently and thoroughly. Inspections should go beyond alignment checks to identify problems and recommend appropriate repairs or replacements. Proper lubrication is important to protect the coupling from damage and can be easily identified using thermography or vibration analysis. In addition to lubrication, a coupling that lacks lubrication may require gaskets or sealing rings.
Proper maintenance of couplings will extend the life of the coupling by minimizing the likelihood of breakdowns. Proper maintenance will help you save money and time on repairs. A well-maintained coupling can be a valuable asset for your equipment and can increase productivity. By following the recommendations provided by your manufacturer, you can make sure your equipment is operating at peak performance.
Proper alignment and maintenance are critical for flexible couplings. Proper coupling alignment will maximize the life of your equipment. If you have a poorly aligned coupling, it may cause other components to fail. In some cases, this could result in costly downtime and increased costs for the company.
Proper maintenance of couplings should be done regularly to minimize costs and prevent downtime. Performing periodic inspections and lubrication will help you keep your equipment in top working order. In addition to the alignment and lubrication, you should also inspect the inside components for wear and alignment issues. If your coupling’s lubrication is not sufficient, it may lead to hardening and cracking. In addition, it’s possible to develop leaks that could cause damage.


The aim of this paper is to investigate the effects of coupling modifications. It shows that such modifications can adversely affect the performance of the coupling mechanism. Moreover, the modifications can be predicted using chemical physics methods. The results presented here are not exhaustive and further research is needed to understand the effects of such coupling modifications.
The modifications to coupling involve nonlinear structural modifications. Four examples of such modifications are presented. Each is illustrated with example applications. Then, the results are verified through experimental and simulated case studies. The proposed methods are applicable to large and complex structures. They are applicable to a variety of engineering systems, including nonlinear systems.
China supplier API 11b Class T and Class Sm Sucker Rod Coupling   coupling brassChina supplier API 11b Class T and Class Sm Sucker Rod Coupling   coupling brass
editor by CX 2023-05-18

Leave a Reply

Your email address will not be published. Required fields are marked *