Tag Archives: belts and pulleys

5B QD Bushed Sheaves Pulleys for “A” and “B” Belts

Size Bushing Type Pulley Type Pitch Diameter (5L/B) Pitch Diameter (4L/ A) Outside Diameter (E) (F) (L) (M) Pulley Weight (LBS)
5B34SD SD E 3.4″ 3.0″ 3.75″ 3-7/32″ 4″ 1-13/16″ 1-1/32″ 6.1
5B36SD SD E 3.6″ 3.2″ 3.95″ 3-7/32″ 4″ 1-13/16″ 1-1/32″ 6.6
5B38SD SD E 3.8″ 3.4″ 4.15″ 3-7/32″ 4″ 1-13/16″ 1-1/32″ 7.1
5B40SD SD E 4.0″ 3.6″ 4.35″ 2-27/32″ 4″ 1-13/16″ 21/32″ 7.4
5B42SD SD E 4.2″ 3.8″ 4.55″ 2-27/32″ 4″ 1-13/16″ 21/32″ 8.0
5B44SD SD E 4.4″ 4.0″ 4.75″ 2-27/32″ 4″ 1-13/16″ 21/32″ 8.5
5B46SD SD A 4.6″ 4.2″ 4.95″ 21/32″ 4″ 1-13/16″ 1-17/32″ 9.0
5B48SD SD A 4.8″ 4.4″ 5.15″ 21/32″ 4″ 1-13/16″ 1-17/32″ 9.4
5B50SD SD A 5.0″ 4.6″ 5.35″ 21/32″ 4″ 1-13/16″ 1-17/32″ 10.0
5B52SD SD A 5.2″ 4.8″ 5.55″ 21/32″ 4″ 1-13/16″ 1-17/32″ 10.4
5B54SK SK A 5.4″ 5.0″ 5.75″ 17/32″ 4″ 1-13/16″ 1-17/32″ 10.8
5B56SK SK A 5.6″ 5.2″ 5.95″ 17/32″ 4″ 1-13/16″ 1-17/32″ 11.3
5B58SK SK A 5.8″ 5.4″ 6.15″ 17/32″ 4″ 1-13/16″ 1-17/32″ 12.0
5B60SK SK A 6.0″ 5.6″ 6.35″ 17/32″ 4″ 1-13/16″ 1-17/32″ 14.0
5B62SK SK A 6.2″ 5.8″ 6.55″ 17/32″ 4″ 1-13/16″ 1-17/32″ 15.0
5B64SK SK A 6.4″ 6.0″ 6.75″ 17/32″ 4″ 1-13/16″ 1-17/32″ 16.0
5B66SK SK A 6.6″ 6.2″ 6.95″ 17/32″ 4″ 1-13/16″ 1-17/32″ 17.0
5B68SK SK A 6.8″ 6.4″ 7.15″ 17/32″ 4″ 1-13/16″ 1-17/32″ 18.0
5B70SF SF A 7.0″ 6.6″ 7.35″ 15/32″ 4″ 1-15/16″ 1-15/32″ 19.0
5B74SF SF A 7.4″ 7.0″ 7.75″ 15/32″ 4″ 1-15/16″ 1-15/32″ 20.0
5B80SF SF A 8.0″ 7.6″ 8.35″ 15/32″ 4″ 1-15/16″ 1-15/32″ 21.0
5B86SF SF A 8.6″ 8.2″ 8.95″ 15/32″ 4″ 1-15/16″ 1-15/32″ 22.0
5B94SF SF A 9.4″ 9.0″ 9.75″ 15/32″ 4″ 1-15/16″ 1-15/32″ 24.0
5B110SF SF A 11.0″ 10.6″ 11.35″ 15/32″ 4″ 1-15/16″ 1-15/32″ 29.0
5B124SF SF A 12.4″ 12.0″ 12.75″ 15/32″ 4″ 1-15/16″ 1-15/32″ 34.0
5B136SF SF A 13.6″ 13.2″ 13.95″ 15/32″ 4″ 1-15/16″ 1-15/32″ 38.0
5B154SF SF A 15.4″ 15.0″ 15.75″ 15/32″ 4″ 1-15/16″ 1-15/32″ 46.0
5B160SF SF A 16.0″ 15.6″ 16.35″ 15/32″ 4″ 1-15/16″ 1-15/32″ 49.0
5B184SF SF A 18.4″ 18.0″ 18.75″ 15/32″ 4″ 1-15/16″ 1-15/32″ 55.0
5B200E E A 20.0″ 19.6″ 20.35″ 3/32″ 4″ 2-3/4″ 1-5/32″ 65.0
5B250E E A 25.0″ 24.6″ 25.35″ 3/32″ 4″ 2-3/4″ 1-5/32″ 86.0
5B300E E A 30.0″ 29.6″ 30.35″ 3/32″ 4″ 2-3/4″ 1-5/32″ 102.0
5B380E E A 38.0″ 37.6″ 38.35″ 3/32″ 4″ 2-3/4″ 1-5/32″ 132.0

5B 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 SD, SK, SF, or E QD bushings, which we also stock. Most of our 5-groove 5B 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.

5B Style QD Bushed Pulley Size Chart

What Role Does the QD Bushing Play in the Pulley?

Quick-Disconnect (QD) bushings are used to mount pulleys to shafts. They help transfer loads between the shaft and pulley and prevent keying out. QD bushings are also designed to provide a secure mounting point for devices.

1. Quick-Disconnect (QD) bushings are used to attach pulleys to shafts

Quick-Disconnect bushings are a popular choice for attaching pulleys to shafts and motors. They provide quick and easy removal without damaging the shaft or other drive components. They are also designed to eliminate fretting corrosion on shafts.

Quick-Disconnect bushings are easily installed and removed and are very easy to use. They are typically made of bronze or PTFE and are available in different sizes and materials. QD bushings are available for various applications, including hydraulic cranes, wind turbines, satellite antennas, and extractors.

Quick-Disconnect bushings are an excellent choice for attaching pulleys to shafts because they are easy to install. The flange-less design of these bushings provides a strong clamping force and minimizes axial runout, while the symmetrical hole pattern offers a good balance.

2. They transfer loads

QD bushings are used to transfer loads in the pulley. The bushing’s size must match the shaft’s size. Bushing tolerances are specified in the MPTA Detachable Bushing and Mating Hub Xihu (West Lake) Dis.lines. Maintaining a gap of approximately 1/8 to 3/8-in between the bushing’s flange and pulley hub is essential to prevent bottoming out or cracking.

Bushings can be made with different types of materials. For example, some industries have traditionally used specific bushing types. For instance, large bore and flanged bushings can be installed in conventional orientation, while small diameter pulleys must be mounted. Bushings with a long bore length and symmetrical hole pattern minimize axial runout and offer a good balance. They can be secured in place with a set screw.

3. They mount devices on shafts

QD bushings are used to mount devices on shafts. The bushings are mounted on rotating device shafts and can be reversed to use them on different shafts. The bushings are precision machined to fit a particular device. They come in a variety of sizes, ranging from JA to M.

The bushings allow for smaller diameter solid shafts, yet they are as strong as keyed shafts. In addition, they can be installed in both the axial and angular directions, making installation and removal easy. Keyless bushings are often cheaper for low-volume applications since they do not require threads. They also allow for generous shaft-to-hub tolerances.

4. They prevent keys from working out of the keyway

QD bushings are an excellent way to prevent a key from working out of the keyway. They control the key from working out of the keyway by preventing it from rotating on its axis. They are available in stainless steel and are made to order to fit the exact dimensions of your key. They are helpful for various automotive, machine tools, and marine applications.

Before installing a QD bushing, you should first clean the keyway and the bushing. You should also remove any oil or anti-seize lubricants. Next, install the bushing by placing the flange end first, then securing the bushing to the shaft. Then, slide the sprocket CZPT the shaft, with the large end of the sprocket in line with the bushing. Once the bushing is in place, drill the bolt holes and insert the pull-up bolts. Lock washers should be installed on the sprocket if it is tapered.

5. They handle different levels of torque and loads

QD bushings are used for shaft-mounted devices to transfer torque and reduce vibration. They come in various styles, including keyless, split taper, and taper locking. Keyless bushings are ideal for tightening shafts without backlash. Quick disconnect bushings are easy to install and provide strong clamping force. They can also be keyed or split to prevent shaft rotation.

QD bushings are metals, such as iron, steel, and gray iron. The material they’re made from varies according to the torque and load they’re designed to handle, but they’re typically used on pulleys.

Technological Processing

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 U.S. 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 forward 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 meters 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.


Q1. Are you a manufacturer or a trading company?

A: We are a manufacturer and trading company.

Q2. What is your sample policy?

A: We can supply the sample if we have finished parts in stock, but customers need to pay for the sample cost and shipping fee.

Q3. Can you produce according to the samples?

A: We can produce power transmission parts according to your samples or technical drawings. We can build the molds and fixtures.

Q4. Do you test all your goods before delivery?

A: Yes, we have 100% test before delivery.

Q5. Can you customize pulleys?

A: Yes, please send us your drawing for an accurate quotation.

Q6. How long is your delivery time and shipment?

A: 1. Sample Lead-times: 10-20 days.

2. Production Lead-times: 30-45 days after the order is confirmed.

Q7. How do you make our business a long-term and good relationship?

A: 1. We keep good quality and competitive price to ensure our customers’ benefits ;

2. We respect every customer as our friend and sincerely do business and make friends with them, no matter where they come from.

Q8: What are your advantages?

1. The most competitive price and good quality.

2. Perfect technical engineers give you the best support.

3. OEM is available.

Additional information

Calculate the ideal mechanical advantage of pulleys

The basic equations for pulleys can be found in this article. It will also cover the different types of pulleys, the ideal mechanical advantages of pulleys, and some common uses of pulley systems. Read on to learn more! After all, a pulley is a simple mechanical device that changes the direction of a force. Learn more about pulleys and their common uses in engineering.

pulley basic equation

Pulleys work the same way as gravity, so they should withstand similar forces. Newton’s laws of motion can be used to calculate the forces in a pulley system. The second law of motion applies to forces and accelerations. Similar to this is Newton’s third law, which states that the directions of forces are equal and opposite. The 4th law dictates the direction of force. The Fifth Law states that 10sion is in equilibrium with gravity.
A pulley is a simple mechanism that transmits force by changing direction. They are generally considered to have negligible mass and friction, but this is only an approximation. Pulleys have different uses, from sailboats to farms and large construction cranes. In fact, they are the most versatile mechanisms in any system. Some of their most common applications and equations are listed below.
For example, consider 2 masses m. Those of mass m will be connected by pulleys. The static friction coefficient of the left stop is ms1, and the static friction coefficient of the right stop is ms2. A no-slip equation will contain multiple inequalities. If the 2 blocks are considered to be connected by a pulley, the coefficient of kinetic friction is mk. In other words, the weight of each block carries the same mass, but in the opposite direction.

Types of pulleys

A pulley is a device used to pull and push objects. Pulley systems are ropes, cables, belts or chains. The “drive pulley” is attached to the shaft and moves the driven pulley. They are available in a variety of sizes, and the larger they are, the higher the speed of power transmission. Alternatively, use small pulleys for smaller applications.
Two-wheel pulleys have 2 mechanical advantages. The greater the mechanical advantage, the less force is required to move the object. More wheels lift more weight, but smaller pulleys require less force. In a 2-wheel pulley system, the rope is wound around 2 axles and a fixed surface. As you pull on the rope, the shafts above slowly come together.
Compound pulleys have 2 or more rope segments that are pulled up on the load. The mechanical advantage of compound pulleys depends on the number of rope segments and how they are arranged. This type of pulley can increase the force by changing the direction of the rope segment. There are 2 main types of pulleys. Composite pulleys are most commonly used in construction. The ideal mechanical advantage of pulleys is 2 or more.
Construction pulleys are a basic type. They are usually attached to wheel rails and can be lifted to great heights. Combinations of axes are also common. Construction pulleys can be raised to great heights to access materials or equipment. When used in construction, these pulleys are usually made of heavy materials such as wood or metal. They are secured with ropes or chains.

The ideal mechanical advantage of pulleys

The pulley system is a highly complex system with high mechanical advantages. Use a single pulley system to reduce the force required to lift an object by cutting it in half. The mechanical advantage increases as you add more pulleys, such as 6 or 7. To calculate the mechanical advantage of a pulley system, you need to count the number of rope segments between the pulleys. If the free end of the rope is facing down, don’t count it. If it’s facing up, count. Once you have your number, add it up.
The required mechanical advantage of a pulley is the number of rope segments it has to pull the load. The more rope segments, the lower the force. Therefore, the more rope segments the pulley has, the lower the force. If the rope segments are 4, then the ideal mechanical advantage is 4. In this case, the composite pulley quadrupled the load force.
The ideal mechanical advantage of a pulley system is the sum of the mechanical force and the force required to lift the load at its output. Typically, a single pulley system uses 2 ropes, and the mechanical force required to lift the load is multiplied by the 2 ropes. For a multi-pulley system, the number of ropes will vary, but the total energy requirement will remain the same. The friction between the rope and pulley increases the force and energy required to lift the load, so the mechanical advantage diminishes over time.

Common uses of pulley systems

A pulley system is a simple mechanical device typically used to lift heavy objects. It consists of a rotating wheel attached to a fixed shaft and a rope attached to it. When the wheel moves, the force applied by the operator is multiplied by the speed of the pulley, and the force is multiplied by the weight of the object being lifted. Common uses for pulley systems include pulling, lifting, and moving heavy objects.
The oil and petroleum industries use pulley systems in a variety of applications. Most commonly, pulleys are used in drilling operations and they are installed on top of the rig to guide the cable. The cable itself is attached to 2 pulleys suspended in the derrick, where they provide mechanical energy to the cable. Using a pulley system in this application provides the force needed to move the cable safely and smoothly.
The main advantage of the pulley system is that it minimizes the force required to lift an object. The force used to lift the object is multiplied by the desired mechanical advantage. The more rope segments, the lower the force required. On the other hand, a compound pulley system can have many segments. Therefore, a compound pulley system can increase the force a worker can exert on an object.
Safety Precautions to Take When Working on Pulley Systems

There are many safety precautions that should be observed when working on a pulley system. The first is to wear proper protective gear. This includes hard hats that protect you from falling objects. Also, gloves may be required. You should limit the amount of movement in the penalty area, and you should also keep the area free of unnecessary people and objects. Also, remember to wear a hard hat when working on the pulley system.
Another important safety precaution when working on a pulley system is to check the Safe Working Load (SWL) of the pulley before attaching anything. This will help you understand the maximum weight the pulley can hold. Also, consider the angle and height of the pulley system. Always use safety anchors and always remember to wear a hat when working on a pulley system.
Safe use of chain hoists requires training and experience. It is important to read the manufacturer’s manual and follow all safety precautions. If you’re not sure, you can actually inspect the hoist and look for signs of damage or tampering. Look for certifications for sprocket sets and other lifting accessories. Look for the Safe Working Load (SWL) marking on the chain hoist.

Example of a pulley system

Pulley systems are often used to lift items. It allows you to reduce the effort to lift and move the load by applying force in 1 direction. Pulley systems can be built and modeled to fit any type of project. This resource focuses on pulley systems and is designed to support the new GCSEs in Engineering, Design and Technology. There are also many examples of pulley systems suitable for various applications.
In the study, participants who read easy text took longer to manipulate the pulley system than those who read challenging text. In general, this suggests that participants with prior scientific experience used their cognitive abilities more effectively. Additionally, students who read simple texts spent less time planning the pulley system and more time on other tasks. However, the study did show that the time required to plan the pulley system was similar between the 2 groups.
In everyday life, pulley systems are used to lift various objects. Flagpoles are 1 of many pulley systems used to raise and lower flagpoles. They can also be used to raise and lower garage doors. Likewise, rock climbers use pulleys to help them ascend and descend. The pulley system can also be used to extend the ladder.

China Machined Solid Plastic PU Polyurethane Pulleys for Round Belts, V-Belts, and Flat Belts Nylon Plastic Pulley with ce certificate top quality Good price

Merchandise Description

Merchandise Description

Introduction of the UHMW-PE machined parts :

UHMWPE shaped pieces is a thermoplastic engineering plastic. It combines the superior performance of all plastic, resistant to abrasion, impact resistance, chemical resistance, selflubricating, low temperature resistance,small wear coefficient, light weight, aging resistance, flame retardant, anti-static and other excellent  performance.


Attributes of the UHMW-PE machined components :

1.Best shock resistance even in low temperature

2.Low frictional factor, and well sliding bearing material 

three.Lubricity (no caking, in adhesion)

4.Best chemical corrosion resistance and stress craze resistance

5.Excellent machinery process ability

6.Lowest water absorption

7.Paragon electric insulativity and anti-static behavior

8.Nice high energy radioactive resistance

nine.Abrasive resistance which always have in thermoelectricity polymer

ten.Density is lower than other thermoplastic


Characterics of the UHMW-PE machined components :







Regular molecular weight



Tensile power (23ºC)



Breaking strength


forty two

Tensile strain at crack



Charpy impact power (notched)


No break

Ball indentation hardness


forty two

Shore D hardness




70-80, metal =a hundred

Static friction coefficient


Kinetic friction coefficient


Drinking water absorption


Elongation at break at 23 degree


>=three hundred

Temperature resistance


-269 to eighty five

Soften temperature


one hundred thirty-one hundred forty



Types of the UHMW-PE machined elements :

 Gear wheels, runners, rope guide rollers, valves, slides (for strongly corrosive media), guide bars, non abrasive strips, wipers, rollers and cam grooves for conveyor belts. Components for pumps, gaskets, punch plates in the leather and plastic industries. Suction bands and boxes for the paper industries. Reflecting plates for sand blasting plants grinding and polishing wheels after incorporating suitable fille




Common measurement

According to your drawings.




Organic, Black, Yellow, Crimson etc. CZPT ized. any colour is okay.


One particular cease procurement


1-200mm, or CZPT ized


Manufacturing unit cost presented


Consumers give style or picture or we produce design and style according to CZPT ers’requirements.



Free of charge sample

Of course


sheet, rod, tube, gear, pulley, guide rail, and so on.


Fedex, DHL,UPS, Sea transportation and so forth.


Plastic luggage, Cartons, CZPT den situation, Pallet, Container and so forth.


Automotive, Agricultural, CZPT ctronics

Thorough Photos

Our Advantages

1. We are manufacturing unit providing CNC services and machining plastic parts
two. Handling components of very tight tolerance and quite complicated geometry
three. Reduced MOQ (1pc is even suitable in some unique conditions)
4. Providing cost-free and swift prototyping ( typically 1 7 days)
five. Sharp on time shipping
six. CZPT high quality confirmed by expert workers, taking care of method and position of services.
7. Providing consultancy provider on elements machining
eight. CZPT ized measurement and spec /OEM CZPT
9. Close to ZheJiang and ZheJiang g,HangZhou, practical transportation.
ten, Our CZPT service for much more than twenty several years of encounter

Much better services

1.QC Method: 100% inspection on vital dimensions just before shipment.
two.Drawing structure: CAD / PDF/ DWG/ IGS/ CZPT /X-T and so on.
three.Packaging: Standardpackage / Pallet or container / As for each CZPT ized specifications
four.Payment Terms: 30 -50%T/T or Paypal/ CZPT ern CZPT in CZPT , 70-50% stability prior to delivery PayPal or CZPT ern CZPT or T/T is suitable.
5.Cargo Phrases: 1) -100kg: categorical&air freight priority, 2) >100kg: sea freight priority, 3) As for every CZPT ized specifications
6.Trade terms: EXW, FOB, CIF perfered

Software Places

Organization Profile

HangZhou CZPT yue CZPT CZPT Co., Ltd. is found in the CZPT CZPT Zone of HangZhou City, ZheJiang Province. It is a single of the earliest organizations engaged in composite components, CZPT plastics, rubber and plastic items.Firm’s main products: POM, MC Nylon, Oil Nylon, HDPE, Abdominal muscles, PBT, PET, PVC, Computer, PU, PP, PTFE, PVDF, PEI, PSU, PPS, CZPT , PAI, PI, PBI.


Our business broad variety of accessories processing problems, these kinds of as mass CZPT ization creation ability, exquisite
production technological innovation and CZPT d production gear, specialist technological tips and following-sales support of

Packaging & CZPT

Packing Details : Interior plastic bag,outdoors carton box,very last is the pallet,all are based mostly on the CZPT ers’ requirments
Delivery Specifics : 10-thirty days after you confirm the samples
Payment terms: Payment=1000USD, thirty% T/T in CZPT ,equilibrium before shippment.If you have another query, pls really feel cost-free to speak to us.


one. Q: Are you investing organization or manufacturer ?
A: We are company.

two. Q: How CZPT is your supply time?
A: According to the trouble and quantity of solution processing,a reasonable arrival time will be provided to you.
Generally 2-5 days for CNC device processing elements. It will consider close to 2-4 weeks for mould generating.

3. Q: Do you provide samples ? is it cost-free or further ?
A: Of course, we could provide the sample for totally free demand but do not pay the value of freight.

four. Q: Can you do assembly and CZPT ized deal for us?
A: We have an assembly manufacturing unit and can assemble all varieties of plastic, steel and digital areas for you. For the completed
goods,we can CZPT ized the retail package and you can market it directly after receiving them.

Make contact with us for far more details



Idler: A pushed wheel that does not transmit energy by means of a shaft. It spins freely, and most driven pulleys are connected to other gear, such as wheels or drives, by way of driveshafts.
China Machined Solid Plastic PU Polyurethane Pulleys for Round Belts, V-Belts, and Flat Belts Nylon Plastic Pulley with ce certificate top quality Good price