China supplier 4D Series Cast Iron Qd Bushing Sheaves Pulley for D Belts pulley band

Product Description

4D Series Cast Iron QD Bushing Sheaves Pulley for D Belts

Product Description

4D series four-groove QD bushed sheaves are manufactured for D-series classic v-belts and D-banded belts; they range from 12.64″ to 58.64″ in diameter. Depending on the sheave size, they are made to use an F, J, or M QD (quick detachable) bushings, which we also stock. Most of our 4D QD sheaves 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.

Product Parameters



Bushing Type


Pitch Diameter

Outside Diameter





Sheave Weight (LBS)

4D120F F A 12.0″ 12.64″ 31/32″ 6-1/16″ 3-3/4″ 1-11/32″ 83
4D130F F A 13.0″ 13.64″ 31/32″ 6-1/16″ 3-3/4″ 1-11/32″ 86
4D135F F A 13.5″ 14.14″ 31/32″ 6-1/16″ 3-3/4″ 1-11/32″ 89
4D140F F A 14.0″ 14.64″ 31/32″ 6-1/16″ 3-3/4″ 1-11/32″ 92
4D145F F A 14.5″ 15.14″ 31/32″ 6-1/16″ 3-3/4″ 1-11/32″ 95
4D150F F A 15.0″ 15.64″ 31/32″ 6-1/16″ 3-3/4″ 1-11/32″ 99
4D155F F A 15.5″ 16.14″ 31/32″ 6-1/16″ 3-3/4″ 1-11/32″ 102
4C160F F A 16.0″ 16.64″ 31/32″ 6-1/16″ 3-3/4″ 1-11/32″ 106
4D180J J A 18.0″ 18.64″ 1/8″ 6-1/16″ 4-5/8″ 1-5/16″ 120
4D200J J A 20.0″ 20.64″ 1/8″ 6-1/16″ 4-5/8″ 1-5/16″ 132
4D220J J A 22.0″ 22.64″ 1/8″ 6-1/16″ 4-5/8″ 1-5/16″ 155
4D270J J A 27.0″ 27.64″ 1/8″ 6-1/16″ 4-5/8″ 1-5/16″ 193
4D330M M B 33.0″ 33.64″ 11/32″ 6-1/16″ 6-3/4″ 1-1/32″ 280
4D400M M B 40.0″ 40.64″ 11/32″ 6-1/16″ 6-3/4″ 1-1/32″ 348
4D480M M B 48.0″ 48.64″ 11/32″ 6-1/16″ 6-3/4″ 1-1/32″ 380
4D580M M B 58.0″ 58.64″ 11/32″ 6-1/16″ 6-3/4″ 1-1/32″ 420


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 CHINAMFG to the presence of customers at home and abroad, seeking CHINAMFG benefits and joint cause development.

Warehouse Stock

The warehouse covers an area of 5000 square CHINAMFG 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)

Request Sample

variable pulley

Are there different types of variable pulleys, and how do they vary in applications?

Yes, there are different types of variable pulleys, also known as variable speed pulleys or adjustable pulleys. These pulleys vary in their design and mechanism, leading to differences in their applications and functionality. Here are some common types of variable pulleys and their respective applications:

1. V-Belt Variable Pulleys:

V-belt variable pulleys consist of two cone-shaped pulleys that can move closer or farther apart. As the distance between the pulleys changes, the effective diameter of the pulley changes, thereby altering the speed ratio. These pulleys are commonly used in applications such as:

  • Automotive engines
  • Industrial machinery
  • Power transmission systems

2. Variable Speed Belt Pulleys:

Variable speed belt pulleys are similar to V-belt variable pulleys but use flat belts instead of V-belts. They provide stepless speed variation by adjusting the axial position of the two pulleys. These pulleys find applications in:

  • Machine tools
  • Woodworking equipment
  • Textile machinery

3. Variable Diameter Pulleys:

Variable diameter pulleys, also known as step pulleys or cone pulleys, have multiple steps with different diameters. By manually shifting the belt between different steps, the effective diameter of the pulley changes, resulting in variable speed ratios. These pulleys are commonly used in:

  • Drill presses
  • Lathes
  • Milling machines

4. Variable Pitch Pulleys:

Variable pitch pulleys have a unique design with movable flanges that can change the groove width, altering the effective pitch diameter of the pulley. This adjustment allows for variation in speed ratios. These pulleys are used in applications such as:

  • Conveyor systems
  • Material handling equipment
  • Printing presses

5. Toroidal or Continuously Variable Pulleys:

Toroidal or continuously variable pulleys consist of two discs with a groove in a unique shape. These pulleys provide stepless and continuous variation of the speed ratio by changing the position of the belt along the groove. They are commonly found in:

  • Automotive continuously variable transmissions (CVT)
  • Industrial machinery requiring precise speed control

Each type of variable pulley offers specific advantages and is suitable for different applications based on factors such as the required speed range, torque, precision, and ease of adjustment. By selecting the appropriate type of variable pulley, engineers and designers can optimize the performance of machinery and equipment in various industries.

variable pulley

What maintenance procedures are necessary to ensure the reliability of variable pulleys?

To ensure the reliability and longevity of variable pulleys, regular maintenance procedures should be followed. These maintenance procedures help prevent premature wear, ensure optimal performance, and extend the lifespan of the pulleys. Here are some essential maintenance procedures for variable pulleys:

1. Cleaning and Inspection:

Regular cleaning of variable pulleys is crucial to remove dirt, dust, and debris that can accumulate on the pulley surfaces. The pulleys should be inspected for any signs of wear, damage, or misalignment. If any issues are detected, appropriate actions, such as repairs or replacement, should be taken to prevent further damage.

2. Lubrication:

Proper lubrication is essential for smooth operation and reduced friction in variable pulleys. Lubricants should be applied to the pulley bearings, shafts, and other moving parts as recommended by the manufacturer. This helps minimize wear and ensures efficient power transmission.

3. Belt Tension Adjustment:

The tension of the belts or chains used with variable pulleys should be regularly checked and adjusted if necessary. Proper belt tension ensures optimal grip and power transmission efficiency. If the belts are too loose or too tight, it can lead to slippage, reduced performance, and increased wear on the pulleys and belts.

4. Alignment:

Variable pulleys should be properly aligned with the input and output shafts of the machinery. Misalignment can cause uneven belt wear, increased vibration, and reduced power transmission efficiency. Regular inspection and adjustment of the pulley alignment can prevent these issues and ensure smooth operation.

5. Belt or Chain Replacement:

Over time, belts or chains used with variable pulleys may wear out and require replacement. It is important to monitor the condition of the belts or chains and replace them when signs of wear, cracking, or stretching are observed. This helps maintain optimal power transmission and prevents unexpected failures.

6. Regular Performance Testing:

Periodic performance testing of variable pulleys is recommended to ensure they are operating as intended. This can involve measuring speed ratios, torque transmission, and overall efficiency. Performance testing helps identify any deviations from the desired specifications and allows for timely corrective actions.

7. Following Manufacturer’s Guidelines:

It is crucial to follow the maintenance guidelines provided by the pulley manufacturer. These guidelines may include specific maintenance intervals, recommended lubricants, inspection procedures, and other important instructions. Adhering to the manufacturer’s guidelines ensures that the pulleys are maintained correctly and in accordance with their design specifications.

By following these maintenance procedures, variable pulleys can remain reliable and perform optimally throughout their lifespan. Regular cleaning, inspection, lubrication, belt tension adjustment, alignment checks, belt or chain replacement when necessary, regular performance testing, and adherence to manufacturer’s guidelines contribute to the overall reliability and longevity of variable pulleys.

variable pulley

How does a variable pulley assist in changing the speed and power transmission?

A variable pulley, also known as a variable speed pulley or a variable drive pulley, plays a crucial role in changing the speed and power transmission in mechanical systems. Let’s explore how it accomplishes these functions:

1. Speed Adjustment:

A variable pulley allows for continuous speed adjustment by changing the effective diameter of the pulley system. When the movable pulley half is positioned closer to the fixed pulley half, the effective diameter increases. This results in a larger belt or chain contact area and a higher speed ratio between the input and output shafts. Conversely, when the movable pulley half is positioned farther away, the effective diameter decreases, leading to a smaller contact area and a lower speed ratio. By adjusting the position of the movable pulley half, the speed of the driven components can be precisely controlled without the need for manual gear changes or transmission adjustments.

2. Power Transmission:

A variable pulley transfers power from the input shaft to the output shaft through the belt or chain. By changing the speed ratio, the variable pulley adjusts the rotational speed of the output shaft relative to the input shaft. This allows for optimization of power transmission in mechanical systems. For example, in applications where high torque is required, the variable pulley can be adjusted to provide a lower speed ratio, resulting in increased torque at the output shaft. Conversely, when higher speeds are desired, the variable pulley can be adjusted to provide a higher speed ratio, sacrificing some torque in favor of increased rotational speed.

3. Smooth Transitions:

One of the advantages of a variable pulley is its ability to provide smooth transitions between different speed ratios. The actuation mechanism associated with the variable pulley allows for precise and controlled movement of the movable pulley half. This enables gradual adjustments in the effective diameter, ensuring seamless speed changes without sudden jolts or disturbances in power transmission.

4. Flexibility and Adaptability:

Variable pulleys offer flexibility and adaptability in mechanical systems. They can accommodate different load conditions, operational requirements, and variations in input power. By adjusting the position of the movable pulley half, the speed and power transmission characteristics can be tailored to suit specific needs, resulting in efficient and optimized performance.

Overall, a variable pulley assists in changing the speed and power transmission by providing continuous speed adjustment, optimizing power transfer, enabling smooth transitions, and offering flexibility in mechanical systems. Its ability to precisely control speed ratios without the need for manual gear changes makes it a valuable component in various applications, ranging from automotive systems and manufacturing machinery to exercise equipment and power transmission systems.

China supplier 4D Series Cast Iron Qd Bushing Sheaves Pulley for D Belts   pulley band	China supplier 4D Series Cast Iron Qd Bushing Sheaves Pulley for D Belts   pulley band
editor by CX


variable pulley

As one of leading variable pulley manufacturers, suppliers and exporters of products, We offer variable pulley and many other products.

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