When buying a plastic pulley, consider its size, function, type of plastic, weight limit, and whether it needs a mountable frame. Double pulleys can increase versatility, but choose based on application and rope/cable size. Look for grooved pulleys to keep the rope/cable in line.
Light duty applications will benefit from a lightweight and inexpensive plastic pulley. Before buying one, however, be sure to determine exactly how you intend to use the plastic pulley and look for a size and function that will suit your needs. Pulleys can come in various sizes and the life of the pulley can be affected by the type of plastic used to construct it. Consider if you just want a plastic pulley or if you need other components like an axle, frame, and so on.
In many cases, a plastic sheave is designed to be used with a certain diameter of rope or cable. Be sure to find out which one is best for your pulley and make sure the pulley and cable or rope meet your needs. Pulleys can also be rated by weight, so if you intend to lift or move objects using the plastic pulley, be sure to take note of its weight limits. Sometimes more than one plastic sheave can be used in a block and tackle system, increasing the amount of weight the system can carry or pull. Be sure to consider your weight requirements and purchase the appropriate types and numbers of pulleys.
If you intend to mount the pulley to a wall, ceiling, or other fixed object, be sure to choose a pulley that has a mountable frame. This frame can also be made from plastic, although it’s a good idea to look for a plastic pulley mounted in a stronger metal frame that won’t snap, crack or otherwise fail from the force applied to it. Whenever possible, purchase a pulley with a frame that includes mounting hardware so you can install the unit quickly and easily.
A hoist system may require a double pulley. This means that two pulleys are mounted within a single frame and the pulleys are able to rotate independently of each other. This increases the versatility of the unit, especially if you intend to use the pulley as part of a lifting system. Like other systems, the double pulley will need to be chosen based on its applications, as well as the size of rope or cable that will be threaded through it. Look for hollow or grooved pulleys that will help keep the rope or cable in line during use.
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