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China manufacturer 4b Qd Bushed Sheaves Pulleys for a and B Belts with Hot selling

Product Description

4B QD Bushed Sheaves Pulleys for A and B Belts


Product Description

4B series pulleys are manufactured for A, AX, AA, 4L, B, BX, BB, and 5L v-belts, ranging from 3.75″ to 38.35″ in diameter. Depending on the pulley size, they are made to use with SH, SD, SK, SF, or E QD bushings, which we also stock. Most of our four-groove 4B QD bushed pulleys are manufactured from a high-strength grade 35 cast iron, are phosphate-coated, and are painted for anti-corrosion. All of them are balanced at the factory for smooth machinery operation. The main benefit of using a QD (quick detachable) pulley is that if the bushing (hub) breaks, you don’t have to replace the whole assembly, or if just the pulley gets worn out, the same principle applies. The other significant benefit is that there is a broader range of bore options with QD pulleys than with the “fixed-bore” style.

Product Parameters


Bushing Type

Pulley Type

Pitch Diameter (5L/B)

Pitch Diameter (4L/ A)

Outside Diameter





Pulley Weight (LBS)

4B34SD SD E 3.4″ 3.0″ 3.75″ 2-15/32″ 3-1/4″ 1-13/16″ 1-1/32″ 5.5
4B36SD SD E 3.6″ 3.2″ 3.95″ 2-15/32″ 3-1/4″ 1-13/16″ 1-1/32″ 5.8
4B38SD SD E 3.8″ 3.4″ 4.15″ 2-15/32″ 3-1/4″ 1-13/16″ 1-1/32″ 6.2
4B40SD SD E 4.0″ 3.6″ 4.35″ 2-15/32″ 3-1/4″ 1-13/16″ 21/32″ 6.6
4B42SD SD E 4.2″ 3.8″ 4.55″ 2-15/32″ 3-1/4″ 1-13/16″ 21/32″ 6.9
4B44SD SD E 4.4″ 4.0″ 4.75″ 2-15/32″ 3-1/4″ 1-13/16″ 21/32″ 7.2
4B46SD SD A 4.6″ 4.2″ 4.95″ 21/32″ 3-1/4″ 1-13/16″ 25/32″ 7.6
4B48SD SD A 4.8″ 4.4″ 5.15″ 21/32″ 3-1/4″ 1-13/16″ 25/32″ 8.0
4B50SD SD A 5.0″ 4.6″ 5.35″ 21/32″ 3-1/4″ 1-13/16″ 25/32″ 8.4
4B52SD SD A 5.2″ 4.8″ 5.55″ 21/32″ 3-1/4″ 1-13/16″ 25/32″ 8.8
4B54SD SD A 5.4″ 5.4″ 5.75″ 21/32″ 3-1/4″ 1-13/16″ 25/32″ 9.2
4B56SD SD A 5.6″ 5.2″ 5.95″ 21/32″ 3-1/4″ 1-13/16″ 25/32″ 9.6
4B58SD SD A 5.8″ 5.4″ 6.15″ 21/32″ 3-1/4″ 1-13/16″ 25/32″ 10.0
4B60SD SD A 6.0″ 5.6″ 6.35″ 21/32″ 3-1/4″ 1-13/16″ 25/32″ 10.4
4B62SD SD A 6.2″ 5.8″ 6.55″ 21/32″ 3-1/4″ 1-13/16″ 25/32″ 10.8
4B64SD SD A 6.4″ 6.0″ 6.75″ 21/32″ 3-1/4″ 1-13/16″ 25/32″ 12.0
4B66SD SD A 6.6″ 6.2″ 6.95″ 21/32″ 3-1/4″ 1-13/16″ 25/32″ 12.4
4B68SD SD A 6.8″ 6.4″ 7.15″ 21/32″ 3-1/4″ 1-13/16″ 25/32″ 13.0
4B70SK SK A 7.0″ 6.6″ 7.35″ 7/32″ 3-1/4″ 1-15/16″ 1-3/32″ 13.5
4B74SK SK A 7.4″ 7.0″ 7.75″ 7/32″ 3-1/4″ 1-15/16″ 1-3/32″ 14.0
4B80SK SK A 8.0″ 7.6″ 8.35″ 7/32″ 3-1/4″ 1-15/16″ 1-3/32″ 15.5
4B86SK SK A 8.6″ 8.2″ 8.95″ 7/32″ 3-1/4″ 1-15/16″ 1-3/32″ 17.0
4B94SK SK A 9.4″ 9.0″ 9.75″ 7/32″ 3-1/4″ 1-15/16″ 1-3/32″ 19.0
4B110SK SK A 11.0″ 10.6″ 11.35″ 7/32″ 3-1/4″ 1-15/16″ 1-3/32″ 22.0
4B124SK SK A 12.4″ 12.0″ 12.75″ 7/32″ 3-1/4″ 1-15/16″ 1-3/32″ 29.0
4B136SK SK A 13.6″ 13.2″ 13.95″ 7/32″ 3-1/4″ 1-15/16″ 1-3/32″ 34.0
4B154SF SF A 15.4″ 15.0″ 15.75″ 5/32″ 3-1/4″ 2-1/16″ 1-1/32″ 39.0
4B160SF SF A 16.0″ 15.6″ 16.35″ 5/32″ 3-1/4″ 2-1/16″ 1-1/32″ 42.0
4B184SF SF A 18.4″ 18.0″ 18.75″ 5/32″ 3-1/4″ 2-1/16″ 1-1/32″ 47.0
4B200SF SF A 20.0″ 19.6″ 20.35″ 5/32″ 3-1/4″ 2-1/16″ 1-1/32″ 51.0
4B250E E D 25.0″ 24.6″ 25.35″ 5/32″ 3-1/4″ 2-3/4″ 21/32″ 73.0
4B300E E D 30.0″ 29.6″ 30.35″ 5/32″ 3-1/4″ 2-3/4″ 21/32″ 86.0
4B380E E D 38.0″ 37.6″ 38.35″ 5/32″ 3-1/4″ 2-3/4″ 21/32″ 109.0


Company Profile

HZPT is a professional manufacturer of mechanical parts. Our main products are belt pulleys, sprockets, taper sleeves, coupling, and other transmission parts. Its products are mainly exported to Germany, Britain, France, and other European countries, with an annual export value of 18 million US dollars, accounting for more than 65% of the total output. The annual output value reached 200 million yuan.

Our products all adopt international, European, and American advanced industrial standards, use precise and good processing equipment, develop reasonable production technology, apply efficient and flexible management systems, and improve the quality management system to ensure that the product quality is good and the price is affordable.

Our factory adheres to the enterprise concept of “quality: the basis of enterprise survival, integrity: the basis of enterprise development, service: the source of enterprise development, low price: the instrument of enterprise development.” We are always looking CZPT to the presence of customers at home and abroad, seeking CZPT benefits and joint cause development.

Warehouse Stock

The warehouse covers an area of 5000 square CZPT and can provide all kinds of standard models A/B/C/Z, with complete quantity and large quantity in stock. Meanwhile, it accepts all sorts of non-standard customization for drawing production. The daily production capacity is 10 tons, and the delivery time is short.

Packaging & Shipping


Experienced Workers Packing Pulleys Carefully, safe wooden cases keep parts from being injured or damaged during sea or air shipment.

Certification: CE, ISO
Pulley Sizes: Type F
Manufacturing Process: Forging
Material: Carbon Steel
Surface Treatment: Baking Paint
Application: Chemical Industry, Grain Transport, Mining Transport, Power Plant
US$ 9999/Piece
1 Piece(Min.Order)

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How to use the pulley system

Using a pulley system is a great way to move things around your home, but how do you use a pulley system? Let’s look at the basic equations that describe a pulley system, the types of pulleys, and some safety considerations when using pulleys. Here are some examples. Don’t worry, you’ll find all the information you need in one place!

Basic equations of pulley systems

The pulley system consists of pulleys and chords. When the weight of the load is pulled through the rope, it slides through the groove and ends up on the other side. When the weight moves, the applied force must travel nx distance. The distance is in meters. If there are four pulleys, the distance the rope will travel will be 2×24. If there are n pulleys, the distance traveled by the weight will be 2n – 1.
The mechanical advantage of the pulley system increases with distance. The greater the distance over which the force is applied, the greater the leverage of the system. For example, if a set of pulleys is used to lift the load, one should be attached to the load and the other to the stand. The load itself does not move. Therefore, the distance between the blocks must be shortened, and the length of the line circulating between the pulleys must be shortened.
Another way to think about the acceleration of a pulley system is to think of ropes and ropes as massless and frictionless. Assuming the rope and pulley are massless, they should have the same magnitude and direction of motion. However, in this case the quality of the string is a variable that is not overdone. Therefore, the tension vector on the block is labeled with the same variable name as the pulley.
The calculation of the pulley system is relatively simple. Five mechanical advantages of the pulley system can be found. This is because the number of ropes supporting the load is equal to the force exerted on the ropes. When the ropes all move in the same direction, they have two mechanical advantages. Alternatively, you can use a combination of movable and fixed pulleys to reduce the force.
When calculating forces in a pulley system, you can use Newton’s laws of motion. Newton’s second law deals with acceleration and force. The fourth law tells us that tension and gravity are in equilibrium. This is useful if you need to lift heavy objects. The laws of motion help with calculations and can help you better understand pulley systems.

Types of pulleys

Different types of pulleys are commonly used for various purposes, including lifting. Some pulleys are flexible, which means they can move freely around a central axis and can change the direction of force. Some are fixed, such as hinges, and are usually used for heavier loads. Others are movable, such as coiled ropes. Whatever the purpose, pulleys are very useful in raising and lowering objects.
Pulleys are common in many different applications, from elevators and cargo lift systems to lights and curtains. They are also used in sewing machine motors and sliding doors. Garage and patio doors are often equipped with pulleys. Rock climbers use a pulley system to climb rocks safely. These pulley systems have different types of pinions that allow them to balance weight and force direction.
The most common type of pulley is the pulley pulley system. The pulley system utilizes mechanical advantages to lift weight. Archimedes is thought to have discovered the pulley around 250 BC. in ancient Sicily. Mesopotamians also used pulleys, they used ropes to lift water and windmills. Pulley systems can even be found at Stonehenge.
Another type of pulley is called a compound pulley. It consists of a set of parallel pulleys that increase the force required to move large objects. This type is most commonly used in rock climbing and sailing, while composite pulleys can also be found in theater curtains. If you’re wondering the difference between these two types of pulleys, here’s a quick overview:

Mechanical Advantages of Pulley Systems

Pulley systems offer significant mechanical advantages. The ability of the system to reduce the effort required to lift weights increases with the number of rope loops. This advantage is proportional to the number of loops in the system. If the rope had only one loop, then a single weight would require the same amount of force to pull. But by adding extra cycles, the force required will be reduced.
The pulley system has the advantage of changing the direction of the force. This makes it easier to move heavy objects. They come in both fixed and mobile. Pulleys are used in many engineering applications because they can be combined with other mechanisms. If you want to know what a pulley can do, read on! Here are some examples. Therefore, you will understand how they are used in engineering.
Single-acting pulleys do not change direction, but compound pulleys do. Their mechanical advantage is six. The compound pulley system consists of a movable pulley and a fixed pulley. The mechanical advantage of the pulley system increases as the number of movable wheels decreases. So if you have two wheels, you need twice as much force to lift the same weight because you need a movable pulley.
The mechanical advantage of a pulley system can be maximized by adding more pulleys or rope lengths. For example, if you have a single pulley system, the mechanical advantage is one of the smallest. By using two or three pulleys, up to five times the mechanical advantage can be achieved. You can also gain up to ten times the mechanical advantage by using multiple pulley systems.
The use of a single movable pulley system also adds to the mechanical advantage of the pulley system. In this case, you don’t have to change the direction of the force to lift the weight. In contrast, a movable pulley system requires you to move the rope farther to generate the same force. Using a compound pulley system allows you to lift heavy loads with ease.

Safety Issues When Using Pulley Systems

Pulleys have an incredibly unique structure, consisting of a disc with a groove in the middle and a shaft running through it. A rope or cord is attached to one end of a pulley that turns when force is applied. The other end of the rope is attached to the load. This mechanical advantage means that it is much easier to pull an object using the pulley system than to lift the same object by hand.
Although pulley systems are a common part of many manufacturing processes, some employers do not train their workers to use them properly or install protection to prevent injury. It is important to wear proper PPE and follow standard laboratory safety practices during pulley system activities. Make sure any support structures are strong enough to handle the weight and weight of the rope or rope. If you do fall, be sure to contact your employer immediately.

China manufacturer 4b Qd Bushed Sheaves Pulleys for a and B Belts   with Hot selling	China manufacturer 4b Qd Bushed Sheaves Pulleys for a and B Belts   with Hot selling
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