China Professional Casing and Tubing Coupling with API Standard coupling bolt

Product Description

Casing and Tubing Coupling with API Standard


1. Structure of Casing and Tubing Coupling Description

Casing and tubing coupling can be widely used in cold and hot water supply, heating supply, fire protection, medicinal gas, industrial petroleum pipeline system etc. 

It has already replaced welding fittings in most Europe countries, Asia countries, America, Australia and some other countries.

2. Main Features of Casing and Tubing Coupling

The quality of our products are very good, customers are all very satisfied. We have professional service team and export experience for a lot of years, our products have exported to more than 200 countries in the world. Here you can take easy choosing your needed products.

Diameters: 2 3/8″, 2 7/8″, 3 1/2″, 4 1/2″
Grades: J55, K55, N80-1, N80Q, L80, P110
Connections: EUE, NUE
Other options: Special Beveled
Special Clearance
Directive 10 ( D-10 ) Couplings
Others CZPT request

Stocks availability: 2 3/8″, 2 7/8″, 3 1/2″, 4 1/2″



API Tubing Coupling
Descriptions and size Type of Thread O.D*L
Tubing Coupling 1.050 NUE 33.35*80.96 0.23
1.050 EUE 42.16*82.55 0.38
1.315 NUE 42.16*82.55 0.38
1.315 EUE 48.26*88.90 0.57
1.660 NUE 52.17*88.90 0.59
1.660 EUE 58.88*95.25 0.68
1.900 NUE 55.88*95.25 0.56
1.900 EUE 63.50*98.42 0.84
2-3/8″ NUE 73.02*107.95 1.28
2-3/8″ EUE 77.80*132.82 1.55
2-7/8″ NUE 88.90*130.18 2.34
2-7/8″ EUE 93.17*133.35 2.40
3-1/2″ NUE 107.95*142.88 3.71
3-1/2″ EUE 114.30*146.05 4.10
4″ NUE 120.65*146.05 4.35
4″ EUE 127.00*152.40 4.82
4-1/2″ NUE 132.08*155.58 4.89
4-1/2″ EUE 141.30*158.75 6.05

API Casing Coupling
Descriptions and size Type of Thread O.D*L
Casing Coupling 4-1/2″ STC 127.00*158.75 5.23
4-1/2″ LTC 127.00*177.80 4.15
4-1/2″ BTC 127.00*225.42 4.55
5″ STC 141.30*165.10 4.66
5″ LTC 141.30*196.85 5.75
5″ BTC 141.30*231.78 5.85
5-1/2″ STC 153.67*171.45 5.23
5-1/2″ LTC 153.67*203.20 6.42
5-1/2″ BTC 153.67*234.95 6.36
6-5/8″ STC 187.71*184.15 9.12
6-5/8″ LTC 187.71*222.25 11.34
6-5/8″ BTC 187.71*244.48 11.01
7″ STC 194.46*184.15 8.39
7″ LTC 194.46*228.60 10.83
7″ BTC 194.46*254.00 10.54
7-5/8″ STC 215.90*190.50 12.30
7-5/8″ LTC 215.90*234.95 15.63
7-5/8″ BTC 215.90*263.52 15.82
8-5/8″ STC 244.48*196.85 16.23
8-5/8″ LTC 244.48*254.00 21.67
8-5/8″ BTC 244.48*269.88 20.86
9-5/8″ STC 269.88*196.85 18.03
9-5/8″ LTC 269.88*266.70 25.45
9-5/8″ BTC 269.88*269.88 23.16
10-3/4″ STC 298.45*203.20 20.78
10-3/4″ BTC 298.45*269.88 25.74
11-3/4′ STC 323.85*203.20 22.64
11-3/4′ BTC 323.85*269.88 28.03
13-3/8″ STC 365.12*203.20 25.66
13-3/8″ BTC 365.12*269.88 31.77
16″ STC 431.80*228.6 34.91
16″ BTC 431.80*269.88 40.28
18-5/8″ STC 508.00*228.60 51.01
18-5/8″ BTC 508.00*269.88 62.68
20″ STC 533.40*228.6 43.42
20″ LTC 533.4*292.10 57.04
20″ BTC 533.40*269.88 50.10



After-sales Service: 1 Year
Warranty: 1 Year
Certification: ISO 9001:2000
Power Source: Hydraulic
Operation Pressure: Atmospheric Pressure
Applicable Medium: Crude Oil


Customized Request


Types of Couplings

A coupling is a device that connects two shafts together. It transmits power from one end to another and is used for joining rotating equipment. A coupling is flexible and can accommodate a certain amount of end movement and misalignment. This allows for more flexibility in applications. Various types of couplings are available, and each one serves a specific purpose.

Shaft couplings

There are many types of shaft couplings, and they are used in a wide range of applications. The type you need depends on the torque, speed, and horsepower you need, as well as the size of the shaft and its spatial limitations. You may also need to consider whether the coupling will accommodate misalignment.
Some shaft couplings are flexible, while others are rigid. Flexible couplings can accommodate up to two degrees of misalignment. They are available in different materials, including aluminum, stainless steel, and titanium. They can also be known by different names, depending on the industry. Some couplings can also be used in a single or multiple-shaft application.
The first type of shaft coupling is a rigid coupling, which consists of two parts that fit together tightly around the shafts. These couplings are designed to have more flexibility than sleeved models, and they can be used on fixed shafts as well. The flanged coupling, on the other hand, is designed for heavy loads and is made of two perpendicular flanges. The flanges are large enough to accommodate screws and are generally used with heavy-duty applications.
CZPT shaft couplings are a great choice if you’re looking for a shaft coupling that delivers high performance, durability, and low cost. These metal disc-style couplings provide low backlash and high torsional stiffness. Their high misalignment tolerance reduces reaction loads on connected components, which makes them ideal for high-speed precision applications. Available in single and double-disc models, they have torque ratings of up to 2,200 in-lbs. (250N) and are available in fourteen sizes.
When using shaft couplings, it is important to choose the right type for your application. Backlash can cause a shaft coupling to break or become unusable. In order to prevent this from happening, you should replace worn or loose parts, and ensure that the hub and key are evenly positioned with the shaft. If you’re using a shaft coupling in a motion-control system, it is important to keep the torque level consistent.

Flexible couplings

Flexible couplings are a type of coupling used to connect two shafts. They are made of rubber or plastic and allow for axial movement of the connected equipment. They do not require lubrication and are resistant to fatigue failure. Flexible couplings are useful for a number of applications. A common type of flexible coupling is the gear coupling, which has gear teeth inside its sleeve. Another type of flexible coupling is the metallic membrane coupling. A metallic membrane coupling is flexible due to flexing metallic discs.
One major disadvantage of flexible couplings is their inability to fit certain types of pipe. This is because most couplings need to be stretched to fit the pipe. This problem is often the result of a change in pipe technology. Traditionally, drain and soil pipe is made of ductile iron or cast iron. Today, most pipes are made of PVC, which has a larger outside diameter than either cast or ductile iron. Because of these changes in pipe technology, many coupling manufacturers have not updated their mold sizing.
Flexible couplings can be either metallic, elastomeric, or a combination of the three. While there are some common characteristics of each type, you should always consider the tradeoffs of each type before choosing one. Generally, the most important considerations when selecting a flexible coupling are torque, misalignment, and ease of assembly and maintenance.
Flexible couplings are used in a wide range of industries. They are useful for connecting two pipes to ensure torque transfer. Although the types available are different, these are the most adaptable couplings in the market. They can withstand movement, vibration, and bending without causing any damage to the piping.

Clutch couplings

A clutch coupling connects two rotating shafts by friction. The clutch engages power when the engine is running, disengaging power when the brake is applied. Clutch couplings are used in applications where the speed of a machine is variable or where continuous service is required. The clutch can transmit power, torque, and axial force.
Clutch couplings come in a variety of styles and configurations. Some couplings are flexible, while others are rigid. Flexible couplings are available in a variety of materials, including stainless steel and aluminum. Some couplings also have a non-backlash design, which helps compensate for misalignment.
Clutch couplings may be synchronous or asynchronous. Synchronous couplings engage and disengage automatically when the driven machine exceeds its output speed. These couplings are synchronized by a synchronizing mechanism. When the output speed is exceeded, the synchronizing mechanism initiates the engagement process. The synchronizing mechanism does not engage or disengage when the output speed drops.
High speed clutches are available from a variety of manufacturers. Some manufacturers offer OEM assembly, repair services, and third-party logistics. These manufacturers serve the automotive, chemical, food, and wood industries, as well as the oilfield and material handling industries. Custom clutches can be manufactured for specific applications and can be fitted with additional features, such as precision machined teeth or keyway slots and grooves.
Couplings are available in PCE, C/T, and metric bores. Typically, the size of the input and output shafts will determine which type of coupling is needed. In addition, clutches may be configured for intermediate or high speeds, depending on the required torque.

Clamped couplings

Clamped couplings are commonly used in a variety of industries. They can be used in medical equipment, dental equipment, military equipment, laboratory equipment, and in precision industrial controls. They are available in a wide variety of sizes and keyways. This type of coupling offers a number of advantages, including ease of installation and quick and easy replacement.
A clamp coupling connects two parts by compressing them together. The clamping elements can be formed in a variety of ways, but they all have a gap between their surfaces. This friction squeezes the two parts together, much like pulling two rubber gloves apart. This type of coupling is also useful for joining two hoses or piping units.
Clamped couplings are designed with a single or double clamping shaft. The clamping parts are mounted in two halves and are held together by eight socket head cap screws. They offer high torque capacity and require little installation space. Their high rigidity ensures good positioning accuracy, making them ideal for dynamic drives. In addition, they are wear-free and offer simple radial assembly.
The invention relates to a method and system for clamping pipes to a tank vessel. This invention also relates to a method of loading and unloading tank vessels. The method can be used in oil production platforms and other platforms. A single point mooring method is also used in oil production platforms.
Clamped couplings can also be flexible. They can join two shafts together while allowing a small amount of end movement and misalignment. These couplings may also be used in the assembly of motors and gearboxes.

CZPT’s coupling

CZPT couplings are designed to be flexible, allowing them to accommodate misaligned shafts and transmit torque in either direction. They are made with three discs, two hubs, and a center that are arranged with grooves and fins. These features allow for two degrees of freedom during assembly, and can accommodate misalignment of up to 5% of the shaft diameter.
CZPT couplings have many uses. For example, they can be used to join two parallel coaxial rotating shafts. Their ability to transmit torque at the same rotation mechanism and speed makes them ideal for applications where electrical currents may be a problem. Because the couplings are not made of metal, they are electrically isolated. Designers should test their couplings during the prototype stage to ensure they are working properly.
The CZPT coupling consists of two hubs with one slot on each. An intermediate disk is located between the two hubs. The discs are used to reduce or prevent wear on other machine parts. CZPT couplings are inexpensive and easy to replace. They also have electrical insulation, which makes them easy to repair or replace.
CZPT couplings are a popular choice for stepper motor-driven positioning stages. The plastic center disc offers electrical isolation and absorbs shocks from frequent start/stops. These couplings are available in through-hub and blind-bore styles and can be installed in many applications.
CZPT couplings also allow for small degrees of shaft misalignment. This allows them to function in systems where shaft access is limited. They are easily removed without tools.
China Professional Casing and Tubing Coupling with API Standard   coupling boltChina Professional Casing and Tubing Coupling with API Standard   coupling bolt
editor by CX 2023-04-20