China OEM UL651 4″ Electrical Sch 40 Rigid PVC Conduit Coupling Suppliers-Ctube CT-Sc FT4

Product Description

Product Description

Product Details

Ctube Schedule 40 & 80 Electrical PVC Conduit coupling is sturdy and durable, with excellent properties such as tensile strength, punching resistance, water absorption, etc., and we are a UL Listed manufacturer widely recognized in the industry. Such coupling is used for conneting Schedule 40 & 80 Electrical PVC Conduit pipes.
For over 10 years, we have been committed to offering the best PVC conduit for commercial, residential, and public facilities. Schedule 40 & 80 PVC conduit pipes and fittings can be used in underground, floor, and outdoor environments and will provide years of maintenance-free use. Compared with metal conduits, PVC electrical conduits have the pros such as light weight, good insulation,  sunlight resistance, and lightweight. They are also the best choice for commercial and residential projects.
UL Listed & CSA Approval. UL 651 listed electrical PVC conduit pipes and fittings are prefect match with your project & wholesales in US & CA market. 
UL 94 V-0 & FT4 FIRE RATING. No flaming once cut off the fire source means the greatest fire rating in the industry. 
NON-METALLIC PVC PIPE. heat-,corrosion-,fire-,sunlight-,rust resistant are pros for schedule 40 PVC rigid pipes. 
MULTI-PURPOSE. Whether you routing the electrical wiring conduits aboveground or underground, they both work well.
CUSTOMIZED SERVICES. Thickness and color can be customized to 100% meet your business requirement.


Tensile Strength 5000 CHINAMFG (3.45 kN/cm2)
Extrusion Fusion
Water Absorption <0.50% of Whole Weight After Soak
Resistance to Crushing ID≥70% After Test
Resistance to Impact Less Than 3 of 1/32 inch Cracks &   Tears
Deflection under Load <0.25mm Deformation
Fire Rating UL 94 V-0 & FT4
Resistance to Specific Reagents Less ±2.50% Weight After 60 / 120 Days Soak
Permanency of Printing Yes
Rust & Sunlight Resistant Yes
Color Grey or Customized
Material UPVC
Customized Services Available 
Place of Origin HangZhou, China
Shipping By sea
Samples Available
Length As per standard, can be customized

Information to be marked on conduits,
a) The phrase “rigid PVC conduit,
b) The trade size of the conduit product,
c) The name or trademark of the manufacturer or any other distinctive marking by means of which the organization responsible for the product can be readily identified
d) The date or other dating period of manufacture not exceeding any 3 consecutive months.
For an elbow the date of manufacture is to be the date that:
1) The conduit is extruded when both extrusion and bending occur at the same location or
2) The elbow was formed, where the conduit is extruded at a different location.
f) All markings shall be repeated at uniform intervals and shall appear at least every 10 feet (3 m), but not less than once, on each straight length of PVC conduit.

Quality Assurance
Ctube applied a strict quality management system such as ISO9001:2015 to control the quality of products, and we have established a stricter quality audit system within the factory to ensure that the quality of the products you buy is in the best condition.
At the same time, our products comply with CS A, IEC and other organizational standards, which can ensure that you can buy high-quality products.

Ctube schedule 40 rigid PVC conduits are sunlight resistant and used exposed, encased in concrete, concealed in walls, and in direct burial applications including systems for:
– Utilities;
– Cable, data, and communication lines;
– Institutional, commercial, and industrial buildings;

Size Chart

1/2 CT-SC 0.840 0.109 6000
3/4 CT-SC 1.050 0.113 4400
1 CT-SC 1.315 0.133 3600
1-1/4 CT-SC 1.660 0.140 3300
1-1/2 CT-SC 1.900 0.145 2250
2 CT-SC 2.375 0.154 1400
2-1/2 CT-SC 2.875 0.203 930
3 CT-SC 3.500 0.216 880
3-1/2 CT-SC 4.000 0.226 630
4 CT-SC 4.500 0.237 570
5 CT-SC 5.563 0.258 380
6 CT-SC 6.625 0.280 260
8 CT-SC 8.625 0.322 180

Company Profile

Manufacturing Capability

– Production capacity: 50000 pieces per week
– Packaging methods: plastic bags & PE films, by carton box

Our Advantages



Quality Certification:

– UL Listed
– Compliance with CSA, ETL, and ASTM, NEMA TC-3




Packaging & Shipping





1. What is your MOQ?
    – The MOQ of this product is usually 5000 pieces.
2. What is your delivery time?
    – It depends on the location. Normally the delivery time is around 15-30 days in North America.
3. What is the shipping port?
    – We usually ship the cargo via HangZhou Port.
4. What is your payment term?
    – We accept T/T, or L/C,can be negotiated.
5. How should I contact you?
    – You can contact us by submitting an inquiry form here. → contact us
6. How about the samples?
    – Normally we can provide free samples unless you require too many. 

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rigid coupling

Can Rigid Couplings Be Used in Both Horizontal and Vertical Shaft Arrangements?

Yes, rigid couplings can be used in both horizontal and vertical shaft arrangements. Rigid couplings are designed to provide a solid, non-flexible connection between two shafts, making them suitable for various types of shaft orientations.

Horizontal Shaft Arrangements: In horizontal shaft arrangements, the two shafts are positioned parallel to the ground or at a slight incline. Rigid couplings are commonly used in horizontal setups as they efficiently transmit torque and maintain precise alignment between the shafts. The horizontal orientation allows gravity to aid in keeping the coupling elements securely in place.

Vertical Shaft Arrangements: In vertical shaft arrangements, the two shafts are positioned vertically, with one shaft above the other. This type of setup is often found in applications such as pumps, compressors, and some gearboxes. Rigid couplings can also be used in vertical shaft arrangements, but additional considerations must be taken into account:

  • Keyless Design: To accommodate the vertical orientation, some rigid couplings have a keyless design. Traditional keyed couplings may experience issues with keyway shear due to the force of gravity on the key, especially in overhung load situations.
  • Set Screw Tightening: When installing rigid couplings in vertical shaft arrangements, set screws must be tightened securely to prevent any axial movement during operation. Locking compound can also be used to provide additional security.
  • Thrust Load Considerations: Vertical shaft arrangements may generate thrust loads due to the weight of the equipment and components. Rigid couplings should be chosen or designed to handle these thrust loads to prevent axial displacement of the shafts.

It’s essential to select a rigid coupling that is suitable for the specific shaft orientation and operating conditions. Proper installation and alignment are critical for both horizontal and vertical shaft arrangements to ensure the rigid coupling’s optimal performance and reliability.

rigid coupling

Factors to Consider When Choosing a Rigid Coupling for a Specific System

Choosing the right rigid coupling for a specific system is crucial to ensure proper functionality and reliable performance. Several factors should be considered when making this decision:

1. Shaft Size and Compatibility: The most fundamental factor is ensuring that the rigid coupling is compatible with the shaft sizes of the connected components. The coupling should have the appropriate bore size and keyway dimensions to fit securely onto the shafts.

2. Operating Torque: Consider the torque requirements of the application. The rigid coupling should have a torque rating that exceeds the maximum torque expected during operation to prevent failures and ensure safety.

3. Speed: Determine the rotational speed (RPM) of the connected shafts. Rigid couplings have maximum RPM limits, and the selected coupling should be capable of handling the system’s operating speed.

4. Misalignment Tolerance: Assess the potential misalignment between the shafts. Rigid couplings provide no flexibility, so the system must have minimal misalignment to prevent excessive forces on the components.

5. Temperature and Environment: Consider the operating temperature range and the environment where the coupling will be used. Ensure the chosen material can withstand the temperature and any corrosive or harsh conditions present.

6. Space Limitations: Evaluate the available space for the coupling. Rigid couplings have a compact design, but ensure that there is enough clearance for installation and maintenance.

7. Backlash and Torsional Stiffness: In some precision systems, backlash must be minimized to maintain accurate positioning. Additionally, the torsional stiffness of the coupling can impact system response and stability.

8. Keyway or Keyless Design: Decide between a coupling with a keyway or a keyless design based on the specific application requirements and ease of installation.

9. Material Selection: Consider the material properties of the rigid coupling. Common materials include steel, stainless steel, and aluminum, each with its own advantages and limitations.

10. Maintenance: Determine the maintenance requirements of the coupling. Some couplings may need periodic lubrication or inspections, while others may be maintenance-free.

11. Cost: While cost should not be the sole consideration, it is essential to evaluate the cost-effectiveness of the coupling, taking into account its performance and longevity.

By carefully considering these factors, you can select the most suitable rigid coupling for your specific system, ensuring optimal performance, and longevity of your mechanical setup.

rigid coupling

Advantages of Using Rigid Couplings in Mechanical Systems:

Rigid couplings offer several advantages when used in mechanical systems. These advantages make them a preferred choice in certain applications where precise alignment and high torque transmission are essential. Here are the key advantages of using rigid couplings:

  • 1. High Torque Transmission: Rigid couplings are designed to handle high torque and power transmission without any loss due to flexibility. They provide a direct and solid connection between shafts, allowing for efficient transfer of rotational motion.
  • 2. Precise Alignment: Rigid couplings maintain precise alignment between connected shafts. When installed correctly, they ensure that the two shafts are perfectly aligned, which is crucial for applications where accurate positioning and synchronization are required.
  • 3. Synchronous Rotation: The rigid connection provided by these couplings enables synchronous rotation of the connected shafts. This is particularly important in applications where components must move in precise coordination with each other.
  • 4. Simple Design: Rigid couplings have a straightforward design with minimal moving parts. This simplicity makes them easy to install and maintain, reducing the chances of mechanical failure.
  • 5. Cost-Effective: Compared to some other coupling types, rigid couplings are generally more cost-effective. Their simple design and robust construction contribute to their affordability.
  • 6. High Strength and Durability: Rigid couplings are typically made from strong and durable materials such as steel, stainless steel, or aluminum. These materials can withstand heavy loads and provide long-lasting performance in demanding applications.

Rigid couplings are commonly used in various industries and applications, including high-precision machinery, robotics, automation systems, precision motion control, and machine tools. They are especially beneficial in scenarios where misalignment needs to be minimized or avoided altogether.

It’s important to note that while rigid couplings offer these advantages, they are not suitable for applications where shaft misalignment or shock absorption is required. In such cases, flexible couplings or other specialized coupling types may be more appropriate.

China OEM UL651 4China OEM UL651 4
editor by CX 2024-04-09

As one of leading rigid coupling manufacturers, suppliers and exporters of mechanical products, We offer rigid coupling and many other products.

Please contact us for details.

Mail:[email protected]

Manufacturer supplier exporter of rigid coupling

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