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Conveyor Pulley Terminology Definition

Pulley/Core Diameter

The outside diameter of the cylindrical body of a conveyor pulley, without coating.

Finish Diameter

The outside diameter of a coated pulley (core diameter + 2 times the coating/wrap thickness).

Face Width

The length of a pulley’s cylindrical body. This area is intended to act as the contact surface for the conveyor belt.

Wall/Rim Thickness

The initial thickness of the tube, pipe, or formed plate that makes up the cylindrical body of the pulley.

End Disks

The plates welded on the ends of a pulley which act as the medium between the hub and rim.

Crown/Profile

A change in the shape of the pulley face designed for the purpose of enhancing belt tracking.

Shaft/Axle

The mounting mechanism for the pulley assembly.

Hub

The point of connection between the shaft and end disk or pulley wall.

Bore Diameter

The inner diameter of a pulley at the point where the shaft is inserted

Bearing Centers

The distance between the center lines of each bearing race in which a pulley is mounted.

Hub Centers

The distance between the center line of each hub contact surface.

Safety Factor

The capacity of a system or component to perform beyond its expected load.

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