Product Description


Merchandise Description

API Pin Box Device Joint Couplings for H2o Nicely Drill Pipe



1:Instrument Joint: NC26, NC31, NC38, NC40, NC46, NC50

2:Kind of Instrument joint: NC, IF, FH, XH, REG

3:Content: 40CrMo, 35CrMo, 4137H

Instrument joints are quick sections of pipe that are connected to the tubing part of drill pipe by signifies of employing a flash welding method. The internally threaded resource joint is named a “box”, even though the externally threaded instrument joint if the “pin”

All thread are machined by precision CNC lathe and shaping resources, It can not only guarantee the tightness of the drill pipe joint thread, but also guarantee the precision and interchangeability of the drill pipe joint. 
we also can make drill pipe joints in accordance to consumer request.


Packaging & Shipping and delivery


one. Drill pipe joint packed in carton or picket box.

2. Tailored packing is accepted.


Shipping detail: 15days



Our Benefits

Before order to be confirmed ,the raw material of pipe physique and device joint must be booked from renowned large steel enterprises in China.
Raw material’s dimension ,amount,length,mechanical home are checked by our QC employees and manufacturing unit possess laboratory
Ahead of supply clientele could ship 1 QC or position the 3rd social gathering to verify the high quality these kinds of SGS,BV or others. 

After Sales Services


one. We settle for little purchase, MOQ 1pc.

2. Customized purchase is accept.

three. Quick and ideal support, skilled advice.


Q: Are you buying and selling firm or company ?

A: We are a professional manufacturer.

Q: How lengthy is your shipping and delivery time?

A: Generally it is ten~twenty days if the merchandise are in stock. or it is 20~thirty days if the products are not in stock, it is in accordance to amount.

Q: Where is your manufacturing facility found in?

A: Our factory is located in Lu Jiazhuang Industry Zone, JIN ZHOU town, ZheJiang province, China.

Q: What methods of payment are approved?

A: We concur T/T, L/C,1 contact.

Q: What about the shipment?

A: Our typical loading port is Xihu (West Lake) Dis.g port in ZheJiang ,main port in north of China. The merchandise will be packed into bundle as 3*3,4*4 etc,black portray and thread protectors.

Q: do you agree sample get?

A: Yes, we are welcome your sample get to screening our top quality.

Q: Does your drill pipe have rust prevention?

A: Yes, every drill pipe will be with the rust avoidance by paint or anti-corrosive oil ahead of shipping and its thread area will be nitrided.

Q: do you have right after-sale support and warranty service?

A: Any quality or amount dilemma after confirmed, we will be compensate you the identical. Any issue or problem we will be reply you in 24 hours.

Q: How about your least get amount?

A: At least 10 pieces.Tiny orders also can take.

Business Profile

 HangZhou WeiLiDa Prospecting Machinery Co., Ltd. is a specialist maker of drill pipe, drilling rig and other drilling tools. Our manufacturing unit is positioned in HangZhou, HangZhou . 200 km from the money ZheJiang . We have great export problems to ZheJiang port and HangZhou port. Our manufacturing facility addresses an location of 20000 square meters. Its total property is fifty million yuan.

– Secure raw content getting

– Favorable orders adhere to-up management

– Laudable lead-time & shipment handle

– Traceable high quality evaluation

– Versatile payment conditions

– Outstanding after-sale provider



Standard: RoHS, BS, DIN, JIS, AISI, API
Length: 20cm
Usage: Oil Mining, Coal Mining, Well Drilling, Ore Mining
Material: Carbon Steel
Thread Type: 2 3/8" API Reg, 3 1/2" API Reg (API Thread, Custom
Product Technology: Friction Welding, Nitrading, Tempering Treatment


US$ 17/Piece
1 Piece(Min.Order)

Request Sample


Standard: RoHS, BS, DIN, JIS, AISI, API
Length: 20cm
Usage: Oil Mining, Coal Mining, Well Drilling, Ore Mining
Material: Carbon Steel
Thread Type: 2 3/8" API Reg, 3 1/2" API Reg (API Thread, Custom
Product Technology: Friction Welding, Nitrading, Tempering Treatment


US$ 17/Piece
1 Piece(Min.Order)

Request Sample



Programming With Couplings

A coupling is a mechanical device that connects two shafts together and transmits power. Its purpose is to join rotating equipment and allows some degree of end-movement or misalignment. There are many different types of couplings. It’s important to choose the right one for your application.

Mechanical connection between two shafts

There are many ways to achieve mechanical connection between two shafts, including the use of a coupling. One common type is the beam coupling, which is also known as a helical coupling. It is used for transmission of torque between two shafts. This type of connection accommodates axial, parallel and angular misalignments.
The hubs and shafts of a worm gear are connected together by a coupling. This mechanical connection allows one shaft to turn another without causing a mechanical failure. This type of coupling is made from sliding or rubbing parts to transfer torque. However, the coupling is not designed to withstand jerks, so it isn’t suitable for high-speed applications.
The use of a coupling is common in machinery and equipment. It helps transmit power from one drive shaft to the other, while adding mechanical flexibility. It is also useful for reducing the impact and vibration caused by misalignment. It also protects the drive shaft components from wear and tear.
A double-hook coupling can be used to provide a uniform angular velocity at the driven shaft. Another example is a double-jointed coupling. A double-jointed coupling can be used to connect shafts that are not directly intersecting. The double-jointed yoke can be used for the same purpose.
A shaft coupling is a device that maintains a strong mechanical connection between two shafts. It transfers motion from one shaft to another, at all loads and misalignments. Unlike a conventional linkage, a shaft coupling isn’t designed to allow relative motion between the two shafts. Couplings often serve several purposes in a machine, but their primary use is torque and power transmission.

Functions that control the flow of another function

One of the simplest programming constructs is a function that controls the flow of another function. A function can take an argument and return a different value, but it must be ready to return before it can pass that value to another function. To do this, you can use the goto statement and the if statement. Another way to control flow is to use a conditional statement.

Criteria for selecting a coupling

There are several important factors to consider when choosing the right coupling. One of the most important factors is coupling stiffness, which depends on the material used and the shape. The stiffness of a coupling determines its ability to resist elastic deformation. A stiff coupling is desirable for certain types of applications, but it’s undesirable for others. Stiffness can reduce the performance of a system if there’s too much inertia. To avoid this, ensure that the coupling you choose is within the recommended limits.
The size of a coupling is also important. Different coupling types can accommodate different shaft sizes and shapes. Some couplings have special features, such as braking and shear pin protection. When choosing a coupling, you should also consider the type of driven equipment. If you need to connect a high-torque motor, for example, you’ll want to choose a gear coupling. Likewise, a high-speed machine may require a disc coupling.
Another factor to consider when selecting a coupling is the torque rating. Despite its importance, it’s often underestimated. The torque rating is defined as the torque of the coupling divided by its OD. In some cases, torque may fluctuate during a cycle, requiring a coupling with a higher torque rating.
Torsionally flexible couplings are also important to consider. Their design should be able to withstand the torque required during operation, as well as the required speed. The coupling should also have a high degree of torsional stiffness, as well as damping. Furthermore, a damping coupling can reduce the energy wasted through vibration.
The sizing of a coupling is also determined by the torque. Many engineers use torque to select the correct coupling size, but they also take into consideration torsional flexibility and torsional stiffness. For example, a shaft may be able to handle large torque without damaging the coupling, while a disk may be unable to handle large amounts of torque.
Besides torque, another important consideration in coupling selection is the cost. While a coupling may be cheaper, it may be less reliable or easier to maintain. Couplings that are difficult to service may not last as long. They may also require frequent maintenance. If that’s the case, consider purchasing a coupling with a low service factor.
There are many different types of couplings. Some require additional lubrication throughout their lifetime, while others are 100% lubrication-free. An example of a 100% lubrication-free coupling is the RBI flexible coupling from CZPT. This type of coupling can significantly reduce your total cost of ownership.
In addition to the above-mentioned benefits, elastomeric couplings are low-cost and need little maintenance. While they are often cheaper than metallic couplings, they also have excellent shock absorption and vibration dampening properties. However, they are susceptible to high temperatures. Also, they are difficult to balance as an assembly, and have limited overload torque capacity.
China API Pin Box Tool Joint Couplings for Water Well Drill Pipe     coupling devicesChina API Pin Box Tool Joint Couplings for Water Well Drill Pipe     coupling devices
editor by czh 2022-12-20