China manufacturer API 11b Class T and Class Sm Sucker Rod Coupling coupling constant

Product Description

FRP (fiberglass reinforced plastics) sucker rod

FRP (fiberglass reinforced plastics) sucker rod is manufactured in accordance with API 11C and ASTM specifications. The sucker rod receives strict quality control including X-ray nondestructive test and tensile strengt

1. Lightweight and high strength: Fiberglass sucker rods are made of high-strength fiberglass, providing a lightweight solution with excellent strength.
2. Corrosion resistance: These rods possess excellent resistance to corrosion, making them suitable for use in corrosive environments.
3. Rigidity and dimensional stability: Fiberglass sucker rods exhibit superior rigidity and dimensional stability, maintaining their shape and performance over long-term use.
4. Electrical insulation: Being non-conductive, these rods offer good electrical insulation, making them ideal for applications where electrical conductivity needs to be avoided.
5. High-temperature performance: Fiberglass sucker rods can withstand high temperatures, making them suitable for use in high-temperature oil wells or industrial processes.

1. Oil and gas industry: Fiberglass sucker rods are commonly used in oil and gas exploration and production, enabling efficient pumping of oil wells due to their corrosion resistance and high-temperature performance.
2. Chemical industry: These rods find applications in chemical equipment, such as pipelines and fittings, where resistance to corrosion from chemicals is essential.
3. Wastewater treatment and environmental sector: Fiberglass sucker rods play a crucial role in handling and agitating liquids, suspensions, and wastewater treatment processes.
4. Other industries: These rods also find utility in the power industry, aerospace sector, construction engineering, and shipbuilding, catering to specific engineering requirements.













Thread diameter











width of wrench square











Coupling O.D.











Sectional area of rod body






Standard length

mm (ft)

7,620 (25); 8,000 (26.25); 9,140 (30)

Weight of rod with standard length

kg (lb)

13.06 (28.8)

18.43 (40.63)

24.49 (53.7)

31.86 (70.24)

Coupling weight

kg (lb)

0.44 (0.97)

0.52 (1.146)

0.76 (1.675)

1.11 (2.45)

Coupling length (min)

mm (in)

l01.6 (4)

Width of wrench square of couplings

mm (in)

34.9 (13/8)

38.1 (11/2)

41.3 (15/8)

47.6 (15/8)

Specification and parameter of hollow polish rod


Min Y.S

Min T.S

Max T.S














Merchinary property of hollow rucker rod and hollow polish rucker rod.

Strength Grade

Yield Strength

Tensile Strength

Elongation Percentage

Section Contraction

Impact Ductility


Grade D














Detailed Images


Company Profile

For the last couple of years, we focus only on 1 thing: How to make your work better. We think we design, we apply different kinds of accessories to your. Being a design house jointly invested by manufacturers with very different competent and manufacturing processes, we have come up with more than designs covering most of the mainstream. We offer our design with competitive manufacturing process cost to support brands with attitudes and styles. Come talk to us. CNPS. COM LIMITED (CNPS), a professional supplier of petroleum equipment. CNPS can also help our customers source oilfield equipment like OCTG, well logging, MWD, LWD, mud logging, cementing, laser gas detection, etc.

CNPS is a well-resourced and full-service oilfield supplier serving the equipment for oil and gas companies, it is a platform for the exportation of Oilfield Equipments In China, with technical competence, comprehensive expertise of a broad range of equipment, combined with efficient service and a good understanding of the business procedure, will make great benefits to our clients.


Q: Are you trading company or manufacturer ?

A: We are manufacturer in China. 


Q: What is your MOQ?
A: As customer’s request ( For example: FLANGE DN20, MOQ 500KGS).

Q: Can you provide a sample?
A:Sure, Our sample is provided free of charge, but not including courier fees.

Q: What is your terms of payment ?
A: Payment=5000USD

    50%T/T in advance 50%balance before shippment.  




Manufacturing Process: Casting
Surface Treatment: Galvanized
Operation Pressure: None
Material: Alloy
Machine Type: Oil Extraction Equipment
Model No.: Polished Rod
US$ 200/Piece
1 Piece(Min.Order)

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What Is a Coupling?

A coupling is a device used to connect two shafts. It transmits power between them and allows for some misalignment or end movement. There are several types of couplings. The most common ones are gear couplings and planetary couplings. However, there are many others as well.

Transfer of energy

Energy coupling is a process by which two biological reactions are linked by sharing energy. The energy released during one reaction can be used to drive the second. It is a very useful mechanism that synchronizes two biological systems. All cells have two types of reactions, exergonic and endergonic, and they are connected through energy coupling.
This process is important for a number of reasons. The first is that it allows the exchange of electrons and their energy. In a single molecule, this energy transfer involves the exchange of two electrons of different energy and spin. This exchange occurs because of the overlap interaction of two MOs.
Secondly, it is possible to achieve quadratic coupling. This is a phenomenon that occurs in circular membrane resonators when the system is statically deflected. This phenomenon has been gaining a great deal of interest as a mechanism for stronger coupling. If this mechanism is employed in a physical system, energy can be transferred on a nanometer scale.
The magnetic field is another important factor that affects the exchange of energy between semiconductor QWs. A strong magnetic field controls the strength of the coupling and the energy order of the exciton. The magnetic field can also influence the direction of polariton-mediated energy transfer. This mechanism is very promising for controlling the routing of excitation in a semiconductor.


Couplings play a variety of functions, including transferring power, compensating for misalignment, and absorbing shock. These functions depend on the type of shaft being coupled. There are four basic types: angular, parallel, and symmetrical. In many cases, coupling is necessary to accommodate misalignment.
Couplings are mechanical devices that join two rotating pieces of equipment. They are used to transfer power and allow for a small degree of end-to-end misalignment. This allows them to be used in many different applications, such as the transmission from the gearbox to the differential in an automobile. In addition, couplings can be used to transfer power to spindles.


There are two main types of couplings: rigid and flexible. Rigid couplings are designed to prevent relative motion between the two shafts and are suitable for applications where precise alignment is required. However, high stresses in the case of significant misalignment can cause early failure of the coupling. Flexible couplings, on the other hand, allow for misalignment and allow for torque transmission.
A software application may exhibit different types of coupling. The first type involves the use of data. This means that one module may use data from another module for its operation. A good example of data coupling is the inheritance of an object. In a software application, one module can use another module’s data and parameters.
Another type of coupling is a rigid sleeve coupling. This type of coupling has a pipe with a bore that is finished to a specified tolerance. The pipe contains two threaded holes for transmitting torque. The sleeve is secured by a gib head key. This type of coupling may be used in applications where a couple of shafts are close together.
Other types of coupling include common and external. Common coupling occurs when two modules share global data and communication protocols. This type of coupling can lead to uncontrollable error propagation and unforeseen side effects when changes are made to the system. External coupling, on the other hand, involves two modules sharing an external device interface or communication protocol. Both types of coupling involve a shared code structure and depend on the external modules or hardware.
Mechanical couplings are essential in power transmission. They connect rotating shafts and can either be rigid or flexible, depending on the accuracy required. These couplings are used in pumps, compressors, motors, and generators to transmit power and torque. In addition to transferring power, couplings can also prevent torque overload.


Different coupling styles are ideal for different applications, and they have different characteristics that influence the coupling’s reliability during operation. These characteristics include stiffness, misalignment capability, ease of installation and maintenance, inherent balance, and speed capability. Selecting the right coupling style for a particular application is essential to minimize performance problems and maximize utility.
It is important to know the requirements for the coupling you choose before you start shopping. A proper selection process takes into account several design criteria, including torque and rpm, acoustic signals, and environmental factors. Once you’ve identified these parameters, you can select the best coupling for the job.
A gear coupling provides a mechanical connection between two rotating shafts. These couplings use gear mesh to transmit torque and power between two shafts. They’re typically used on large industrial machines, but they can also be used in smaller motion control systems. In smaller systems, a zero-backlash coupling design is ideal.
Another type of coupling is the flange coupling. These are easy to manufacture. Their design is similar to a sleeve coupling. But unlike a sleeve coupling, a flange coupling features a keyway on one side and two threaded holes on the other. These couplings are used in medium-duty industrial applications.
Besides being useful for power transmission, couplings can also prevent machine vibration. If vibration occurs in a machine, it can cause it to deviate from its predetermined position, or damage the motor. Couplings, however, help prevent this by absorbing the vibration and shock and preventing damage to expensive parts.
Couplings are heavily used in the industrial machinery and electrical industries. They provide the necessary rotation mechanism required by machinery and other equipment. Coupling suppliers can help customers find the right coupling for a specific application.

Criteria for selecting a coupling

When selecting a coupling for a specific application, there are a number of different factors to consider. These factors vary greatly, as do operating conditions, so selecting the best coupling for your system can be challenging. Some of these factors include horsepower, torque, and speed. You also need to consider the size of the shafts and the geometry of the equipment. Space restrictions and maintenance and installation requirements should also be taken into account. Other considerations can be specific to your system, such as the need for reversing.
First, determine what size coupling you need. The coupling’s size should be able to handle the torque required by the application. In addition, determine the interface connection, such as straight or tapered keyed shafts. Some couplings also feature integral flange connections.
During the specification process, be sure to specify which materials the coupling will be made of. This is important because the material will dictate most of its performance characteristics. Most couplings are made of stainless steel or aluminum, but you can also find ones made of Delrin, titanium, or other engineering-grade materials.
One of the most important factors to consider when selecting a coupling is its torque capability. If the torque rating is not adequate, the coupling can be damaged or break easily. Torque is a major factor in coupling selection, but it is often underestimated. In order to ensure maximum coupling performance, you should also take into consideration the size of the shafts and hubs.
In some cases, a coupling will need lubrication throughout its lifecycle. It may need to be lubricated every six months or even once a year. But there are couplings available that require no lubrication at all. An RBI flexible coupling by CZPT is one such example. Using a coupling of this kind can immediately cut down your total cost of ownership.
China manufacturer API 11b Class T and Class Sm Sucker Rod Coupling   coupling constantChina manufacturer API 11b Class T and Class Sm Sucker Rod Coupling   coupling constant
editor by CX 2023-08-02