China wholesaler The CZPT Pulley Lfr50/4-4npp, Lfr50/4-4 2RS 4*13*6mm Bearing near me supplier

Product Description

The CZPT pulley lfr50/4-4npp, lfr50/4-4 2RS  4*13*6mm  bearing as replace the imported brand

Cage : TH glass fiber reinforced phenolic resin

1.lfr50/4-4npp, lfr50/4-4 2RS  guide roller are the most widely used and economical products in linear CZPT roller, which can be adapted to cylindrical CZPT rails.

2.lfr50/4-4npp, lfr50/4-4 2RS   roller and CZPT rail contact with 2 points of contact, with good contact performance.

3.lfr50/4-4npp, lfr50/4-4 2RS  roller are designed with double row angular contact ball bearings and the outer ring with extra thickness, which has higher bearing capacity.

4.lfr50/4-4npp, lfr50/4-4 2RS   roller is made of high quality bearing steel, which is processed by heat treatment and precision grinding and is filled with high quality oil with long life. JPG  can also provide all kinds of rollers of R angular outer ring, internal thread, concentric shaft, eccentric shaft and corrosion-resistant stainless steel.

Our company supplies LFR series CZPT roller bearings for a long time. The specific model is as follows:

Lfr50/5-4kdd, r50/5-4zz, lfr50/5-4npp, r50/5-4 2RS, lfr50/5kdd, r50/5-6zz, lfr50/5npp, r50/5-6 2RS, lfr50/8kdd, r50/8-6zz, lfr50/8npp, r50/8-6 2RS, LFR5201KDD, r201-10zz, LFR5201NPP, LFR5202NPP, LFR5202NPP, r202npp, r202npp, r202npp, r202npp, r202npp, r202npp, r202npp, r202npp, r202npp, r202npp, r202npp, r202npp, r202npp, r202npp, r202npp, r202npp, r202npp, r202npp, r202npp, r202npp, r202npp, r202npp, r202npp, r202npp, r202npp, r202npp, r202npp, r202npp 2RS, LFR5301KDD, R301-10ZZ, LFR5301NPP, R301-10 2RS, LFR5302KDD R302-10ZZ, LFR5302NPP, r302-10 2RS, lfr5201-12kdd, r5201-12zz, lfr5201-12npp, r5201-12, 2RS, lfr5201-14kdd, r5201-14zz, lfr5201-14npp, r5201-14. 2RS, lfr5204-16kdd, r5204-16zz, lfr5204-16npp, r5204-16 2RS, lfr5206-20kdd, r5206-20zz, lfr5206-20npp, r5206-20, 2RS, lfr5206-25kdd, lfr5206-25, lfr5206-25npp, r5206-25. 2RS, lfr5207-30kdd, r5207-30zz, lfr5207-30npp, r5207-30 2RS, lfr5208-40kdd, r5208-40zz, lfr5208-40npp, r5208-40 2RS.

Specification as followings :

≈(g) Dw D D C B A Cw(Kn) Cow(Kn)
LFR50/4NPP   3.5 5 4 13 6 7 8.04 1.05 0.85
LFR50/5-4NPP R50/5-42RS 7.5 4 5 16 7 8 9 1.2 0.86
LFR50/5NPP R50/5-62RS 8 6 5 17 7 8 10.5 1.27 0.82
LFR50/8NPP R50/8-62RS 24 6 8 24 11 11 14 3.67 2.28
LFR50/8-8NPP   24 8 8 24 11 11 14.75 3.67 2.28
LFR5200KDD R5200-8ZZ 50 8 10 32 14 14 18 5.6 3.6
LFR5201KDD R5201-10ZZ 68 10 12 35 15.9 15.9 20.65 8.5 5.1
LFR5201-12KDD R5201-12ZZ 68 12 12 35 15.9 15.9 21.75 8.5 5.1
LFR5201-14KDD R5201-14ZZ 107 14 12 39.9 20 19 24 8.9 5
LFR5301KDD R5301-10ZZ 130 10 12 42 19 15.9 24 13 7.7
LFR5202KDD R5202-12ZZ 80 12 15 40 15.9 19 23.4 10 7.8
LFR5302KDD R5302-10ZZ 163 10 15 47 19 20 26.65 16.2 9.2
LFR5204KDD R5204-16ZZ 195 16 20 52 20.6 20.6 31 16.8 9.5


The precision of the bearing is more careful than the general mechanical parts to install and debug.
1) keep the bearings and their surrounding environment clean, and try to install them in closed or semi-closed conditions;
2) use suitable tools and methods (heating) to install the bearing to avoid the brutal percussion, which will cause a strong impact on the bearing and destroy the internal channel;
3) keep the bearings well lubricated and use proper lubricant;
4) pay attention to bearing rust protection, avoid using in damp places, and wear gloves when installing and disassembling;
5) to formulate daily operation specifications for bearing;
6) in case of high temperature, high speed and other special conditions, please communicate with our company in advance, and we will make appropriate adjustments to the products to meet the requirements.


The bearings are coated with anti-rust oil and anti-rust paper in the factory. As long as the packaging is not damaged, the quality of the bearing will be guaranteed.
But long stored in humidity below 65%, the temperature is 20 ºC about conditions, the shelf in 30 cm above the ground is advisable.
In addition, the storage area should avoid direct sunlight or contact with the cold wall.


1.Neutral Package:Plastic Bag + Carton + Pallet;
2.Commercial Package:Plastic Bag + Box + Carton + Pallet;
3.As the clients’ requirement.

1.Less than 1000 pcs , we will send by express.( Door to Door, Convenient ),
Or by  air transport.( Fastest and safest, but expensive )
2.More than 1000pcs , we will send by sea.( Cheapest, safe )

1.Less than 1000 pcs , 100% T/T, Western Union in advance.
2.Between 1000-10000pcs, TT, Western Union, MoneyGram.
3.More than 10000pcs , TT, L/C ,Western Union, MoneyGram.


Types of pulleys and their advantages and disadvantages

There are several types of pulleys. Learn the basic equations of the pulley system. Then learn about the different uses for pulleys. The disadvantages of using pulleys will be covered. Knowing these, you can buy the pulley that suits your needs. Here are some of the best pulley types and their pros and cons.

Basic equations of pulley systems

A pulley system is a mechanism that allows 2 blocks of a certain mass to be connected by a taut rope. The acceleration of each block is the same in magnitude and direction. The external force acting on each block is the weight of the block (10g) and the tension in the string. The tension between the 2 blocks is the total tension and the force acting on the pulley is the weight of the 2 blocks.
This simple mechanism uses 2 simple equations to explain how the system works. First, the mass of the weight on both sides of the pulley must be the same. When the weight is forced to move, the rope tightens and the second pulley descends. The weight is also attached to the second pulley and must be the same distance as the first pulley. This will result in a speed ratio of 2 times the distance covered by the first pulley.
Second, we have to calculate the force required to lift the object. The lower mass is supported by a wire configuration passing through all pulleys, while the uppermost pulley is used to apply the force. The lower block is used to support the weight. The applied force needs to travel a distance nx to move the weight. This distance, called MA, can be written as:
Once we have gathered the necessary information, we can apply the calculations to the pulley system. We can also use the Mechanical Advantage Calculator to calculate the force on the anchor. To do this, we must apply a force to the load as well as to the pulley itself. Using this equation, we can calculate the force required by the load to lift the load.

Types of pulleys

There are 3 basic types of pulleys: movable, fixed and compound. Both types of pulleys translate the force applied to them. The ideal mechanical advantage of pulleys is two. This is because a single movable pulley only doubles the force, whereas a compound pulley doubles or triples the force. This type of pulley is often used with other types of pulleys.
Movable pulls move with the weight of the load, and the force pulling them increases on the lift side. They are often found in utility elevators and construction cranes. These systems are very simple, inexpensive and quiet to use. The force required to lift the object depends on the mechanical advantage of the system. The 2 most common types of pulleys are listed below. Let’s take a closer look at each one.
V-shaped pulleys are used in vehicles and electric motors. These pulleys require a “V” belt to function properly. Some have multiple “V” grooves to avoid slipping. They are used in heavy duty applications to reduce the risk of power slip. These pulleys also have more than 1 “V” groove. V-belt pulleys are commonly used in vehicles and electric motors.
Composite pulleys are made from more than 1 type of cable or rope wrapped around the wheel. They can be fixed or hinged and are usually made of stainless steel or bronze. Composite pulleys have multiple layers and can be a single unit or many different components. There are 3 main types of pulleys: fixed pulleys and composite pulleys. These are the most common types. Almost every type of pulley is used for some type of application.
Fixed pulleys have 1 advantage over movable pulleys: they change direction as the weight of the load increases. They are typically used in heavy construction equipment. Gun tackles, patio tackles, and stationary tackles are examples of equipment that use a pulley mechanism. These devices are very common and can be found on most modern construction sites. They provide great convenience for lifting large loads.


What are the applications of pulleys? Simply put, a pulley is a mechanical device that transforms a difficult task into an easier one. It consists of ropes and pulleys. It is usually used to lift objects. Usually, people wrap a rope around a pulley and pull up to lift the object. One disadvantage of using pulleys is that they require the same force as lifting the object directly.
One of the most popular applications of pulleys is lifting heavy objects. They help people pull up heavy objects and blocks. The system can also be used in seeders, lifts, grinders, etc. Other applications include raising flags, loading cargo, pulling curtains and rock or mountain climbing. Students can learn about the various uses of pulleys and the physics behind them.
Pulleys can be made of many different materials, depending on the application. Some are movable, which means they move with the object they are used to lift. This pulley system can be made of nylon, wire rope or fiber material. The best part about these systems is that they are easy to install and maintain. For a better grasp, use the guide or video tutorial to learn more about the pulley system and how it works.
Tapered pulleys are common in paper mills. They are high-quality pulleys that transmit power to connected parts. They can be dynamic or static and have different balances. Because pulley systems are highly customized, most industrial applications require systems designed specifically for specific applications. In this way, the system is safe, simple and inexpensive. The benefits of this design are endless.
The most common use of pulleys is for motor drives. They are used to minimize noise by applying force to the shaft to reduce the workload. They are also less expensive than gears and do not require lubrication. Furthermore, they can change the direction of the applied force. They are also less expensive than gears and are often used with other components. A screw is a cylindrical member with helical ribs used to connect something.


Although the pulley system makes it easier to move heavy objects, it still has some drawbacks. When using a pulley system, you must remember that the force required to lift the weight increases with the number of cycles. In addition, the distance between the puller and the heavy object increases, which may lead to accidents. Also, moving heavy objects can be tricky if the rope slips. Pulley systems are not very expensive and can be easily assembled. However, it does require a lot of space.
First, it is not efficient. Besides being inefficient, pulleys produce different forces at different speeds. Fixed pulleys use more force than the load, while movable pulleys move with the load. A movable pulley requires less force than a fixed pulley, but the combined system travels a long distance. Therefore, this method is not as efficient as the fixed method.
Pulleys are not only used in industrial processes. You can see them in various places in your daily life. For example, large construction cranes use pulleys to lift heavy loads. Even flagpoles, blinds, clotheslines, ziplines, motors and climbing equipment use pulleys. Still, despite their advantages, the disadvantages are not too serious.
Another disadvantage of the pulley is its wear and tear. While a pulley’s housing is theoretically infinite, its bearings and locking components typically wear out over time. To overcome this problem, a new bearing and locking assembly can be installed. No need to replace the housing and shaft, the entire assembly can be re-bonded and painted to replicate the original look. Alternatively, the pulley can be replaced with a new housing and shaft.
Using pulleys can also reduce the advantage of pulleys. On the other hand, interception and tackle is a system in which 2 pulleys are connected to each other using ropes. Unlike pulleys, pulley pulley systems can be adjusted in the direction of travel and can move heavy loads up to 4 times their force when used in hydraulic lifts.

China wholesaler The CZPT Pulley Lfr50/4-4npp, Lfr50/4-4 2RS 4*13*6mm Bearing     near me supplier China wholesaler The CZPT Pulley Lfr50/4-4npp, Lfr50/4-4 2RS 4*13*6mm Bearing     near me supplier