Product Description

Product Index
  Ductile iron Grey iron
Craft Iron Casting Iron Casting
China QT400-18 QT450-10 QT500-7 QT600-3 QT700-2 QT800-2 QT900-2 HT350 HT300 HT250 HT200 HT150
Germany GGG40 GGG50 GGG60 GGG70 GGG80 GG15 GG20 GG25 GG30 GG35
United state 60-40-18 65-45-12 70-50-5 80-60-03 100-70-03 120-90-02 NO60 NO50 NO45 NO35 NO30 NO20
International EN-GJS400 EN-GJS450,; EN-GJS500,; EN-GJS600 EN-GJL-150 EN-GJL200,; EN-GJL250 EN-GJL300
Chemical elements content C:;3.;5-3.;8% C:;3.;2-3.;7%
Si:;2.;3-2.;8% Si:;1.;8-2.;5%
Mn:;0.;3-0.;5% Mn:;0.;6-0.;9%
P:; ≤0.;09% P:;≤0.;12%
S:; ≤0.;03% S:;≤0.;06%
CT 7∼8 7∼8
Thinkness ≥3.;5mm ≥2.;5mm

Our advantage
1.;We offer OEM and ODM service.;
2.;High quality iron and metal casting manufacturer.;
3.;Experienced technical and inspection team.;
4.;Abundant experience in exporting casting products.;
5.;Regularly production reports.;

Packing and delivery
Packing:; Standard export packaging (Wooden,; steel,; carton case or pallet );
Shipping:;sea freight,; air freight,; express 

Company Infomation
HangZhou Xin Rong CZPT Casting Co.;,; Ltd was established in 1993( originally named HangZhou Rongxiang Casting plant);.; This is 1 of the leading OEM foundry with over 20 years experience in this field.; We specialized in sand casting,; metal casting,; shell mold casting etc.; 
Facilities:; shell core machines,; melting furnaces,; shot blast chambers,; grinding machines,; checkout chemical,; examination equipment,; CZPT front analyzer brinell hardness testers,; CNC machining center.;
Products including:; Auto parts (steering knuckle / spindle,; brake disc,; brake drum,; wheel hub,; motor cover,; impeller,; pulley,; gear,; valve,; etc.;); kitchenware (gas stove parts,; pan support,; floor drain etc.;); Garden protection ( wrought iron gate,; fence parts,; etc.;); road construction ( manhole cover,; road floor drain,; etc.;); pipe fitting etc.; 

Our Services
 1.; We will ensure you that we will reply you within 12 hours for any questions about our products or quotation.;
  2.; We will provide you the reasonable quotation
  3.; we are follow the trade assurance mission which is ensure the on-time shipment and pre shipment product quality.; 
  4.; All of the technical detail,; drawings are confidential ,; unless we receive your permit in writing
  5.; the sample will be provided according to your request.; The sample cost and the freight cost will be shouldered by the customer,; the sample is refundable when you place the volume order.; 

1.; Q:; Are you a factory or trading company?
   We’re a manufacturer with over 20 years of experience in casting.;
2.; Q:; How does your factory handle quality control?
   We are ISO9001 certified and product quality is our priority.;We will test all our raw material before production,; and have third party to do the professional inspection.;
3.; Q:;How to deal with the defective product?
   a.; We will need you to fill up the product defective form with some pictures,; we might also request for a sample of the defective product ( we will take care of the freight cost if it is manufacturing defective);
   b.; We will check and solve the issue,; then repair the defective items or send the replacement accordingly.; 
   c.; We are willing to comply with customer’s reasonable requests.;

Three basic types of pulleys, their applications and ideal mechanical advantages

There are 3 basic types of pulleys: movable, fixed and compound. Each has its advantages and disadvantages, and you should be able to judge which type is best for your needs by looking at the table below. Once you have mastered the different types of pulleys, you can choose the right pulley for your next project. Now that you have mastered the 3 basic types, it is time to understand their applications and ideal mechanical advantages.


The stress characteristics of a pulley depend on its size and construction. These stresses are derived by comparing the stress characteristics of different pulley designs. Stress criteria include static and fatigue strength analyses and specify maximum stress ranges. Stresses are calculated in a 3D stress field, including radial, tangential and axial stresses. The stress characteristics of pulleys are critical to the design and manufacture of industrial machines.
The principal stresses on the pulley shell are distributed in the tangential and hoop directions, close to the centerline of the pulley. If the pulley has a wide face, the axial stress occurring near the shell/disk junction can be large. The stress distribution was determined using British Standard BS5400 Part 10: Stresses at the shell and end disc connections for infinite fatigue life.
Another type of composite is a pulley with a belt section. Such structures are well known in the art. The corresponding help chapters for these elements contain detailed descriptions of the internal structure of these components. Chamfers between pulleys can also be defined using multiple tapers, with a smaller taper extending from midpoint 44 to large diameter 42. Additionally, the pulley can have multiple taper angles, and as the pulley moves away, the taper angle is from the center.


A pulley system uses a rope to move the object and 1 side of the rope to lift the load. The load is attached to 1 end of the pulley, while the other end can move freely in space. The force applied to the free end of the rope pulls the load up or down. Because of this, the mechanical advantage of the movable pulley is 2 to one. The greater the force applied to the free end of the rope, the greater the amount of movement achieved.
There are 3 common types of pulleys. The cast-iron variety has a rim at the front and a hub at the back. The arms of the pulley can be straight or curved. When the arms contract and yield instead of breaking, they are in tension. The top of the pulley centers the belt in motion and is available in widths ranging from 9mm to 300mm.
The rope, hub and axle are mounted on the pulley. They are common and versatile mechanical devices that make it easier to move or lift objects. Some pulleys change the direction of the force. Others change the magnitude. All types of pulleys can be used for a variety of different applications. Here are some examples. If you’re not sure which type to choose, you can find more resources online.


The applications for pulleys are almost limitless. This simple machine turns complex tasks into simple ones. They consist of a rope or chain wrapped around a wheel or axle. Using ropes, 1 can lift heavy objects without the enormous physical exertion of traditional lifting equipment. Some pulleys are equipped with rollers, which greatly magnifies the lifting force.
When used properly, the pulley system can change the direction of the applied force. It provides a mechanical advantage and allows the operator to remain separate from heavy objects. They are also inexpensive, easy to assemble, and require little lubrication after installation. Also, once installed, the pulley system requires little maintenance. They can even be used effortlessly. Despite having many moving parts, pulley systems do not require lubrication, making them a cost-effective alternative to mechanical lifts.
Pulleys are used in many applications including adjustable clotheslines in different machines, kitchen drawers and motor pulleys. Commercial users of pulley systems include cranes. These machines use a pulley system to lift and place heavy objects. They are also used by high-rise building washing companies. They can easily move a building without compromising its structural integrity. As a result, many industries rely on technology to make elevators easier.

Ideal mechanical advantage

The ideal mechanical advantage of a pulley system is the result of rope tension. The load is pulled to the center of the pulley, but the force is evenly distributed over the cable. Two pulleys will provide the mechanical advantage of 2 pulleys. The total energy used will remain the same. If multiple pulleys are used, friction between pulleys and pulleys reduces the return of energy.
Lever-based machines are simple devices that can work. These include levers, wheels and axles, screws, wedges and ramps. Their ability to work depends on their efficiency and mechanical superiority. The ideal mechanical advantage assumes perfect efficiency, while the actual mechanical advantage takes friction into account. The distance traveled by the load and the force applied are also factors in determining the ideal mechanical advantage of the pulley.
A simple pulley system has an MA of two. The weight attached to 1 end of the rope is called FA. Force FE and load FL are connected to the other end of the rope. The distance that the lifter pulls the rope must be twice or half the force required to lift the weight. The same goes for side-by-side pulley systems.

Materials used in manufacturing

While aluminum and plastic are the most common materials for making pulleys, there are other materials to choose from for your timing pulleys. Despite their different physical properties, they all offer similar benefits. Aluminum is dense and corrosion-resistant, and plastic is lightweight and durable. Stainless steel is resistant to stains and rust, but is expensive to maintain. For this reason, aluminum is a popular choice for heavy duty pulleys.
Metal can also be used to make pulleys. Aluminum pulleys are lightweight and strong, while other materials are not as durable. CZPT produces aluminium pulleys, but can also produce other materials or special finishes. The list below is just representative of some common materials and finishes. Many different materials are used, so you should discuss the best options for your application with your engineer.
Metals such as steel and aluminum are commonly used to make pulleys. These materials are relatively light and have a low coefficient of friction. Steel pulleys are also more durable than aluminum pulleys. For heavier applications, steel and aluminum are preferred, but consider weight limitations when selecting materials. For example, metal pulleys can be used in electric motors to transmit belt motion.


Replacing a tensioner in a car’s engine can cost anywhere from $90 to $300, depending on the make and model of the car. Cost can also be affected by the complexity of the pulley system and how many pulleys are required. Replacement costs may also increase depending on the severity of the damage. The cost of replacing pulleys also varies from car to car, as different manufacturers use different engines and drivetrains.
Induction motors have been an industrial workhorse for 130 years, but their cost is growing. As energy costs rise and the cost of ownership increases, these motors will only get more expensive. New technologies are now available to increase efficiency, reduce costs and improve safety standards.
The average job cost to replace an idler varies from $125 to $321, including labor. Parts and labor to replace a car pulley can range from $30 to $178. Labor and parts can cost an additional $10 to $40, depending on the make and model of the car. But the labor is worth the money because these pulleys are a critical part of a car’s engine.

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