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Bearings, V-Belts, Pulleys and Couplings

Radial bearings, V-belts and pulleys, sprockets, bushings, collars and shaft couplings for transmitting power between machines. 693 products from $1.57 to $1,356.99. Tb Wood'S, Ruland Manufacturing, Dayton and more.

693 products from $1.57

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Bearings and bushings: bore, width and shaft fit

Bearings and bushings come first in this aisle, then belts, pulleys and couplings. A bearing is identified by bore, outside diameter and width, usually encoded in the part number; a 17 mm bore, for instance, fits a 17 mm shaft. Open bearings suit lubricated housings, while shielded or sealed ones keep grease in and dirt out. Taper-lock and QD bushings let a pulley or sprocket clamp to a shaft of a different size, so match the bushing's bore and keyway. Shaft collars hold parts in position along a shaft, and clamp-on types grip without marring it; step-up adapters change a bore in fixed steps.

V-belts, pulleys and couplings: matching the drive

V-belts are classified by cross-section, such as the classical A and B sections or the narrow 3V and 5V series, and the pulley groove must match the belt section or the belt wears quickly. Length is given as an outside or pitch length, so read the number on the old belt. Pulley (sheave) diameters set the speed ratio between motor and driven shaft, and multi-belt drives wear evenly with matched sets. A coupling joins two shafts and must suit both shaft diameters and the misalignment it has to absorb.

Questions about Bearings, V-Belts, Pulleys and Couplings

How do I find the right replacement V-belt?
Read the number printed on the old belt, which gives its section and length. If it is worn off, measure the top width and depth to identify the section, then measure the length around the belt, and compare against the maker's cross-reference.
What is a QD or taper-lock bushing?
It is a split tapered bushing that locks a pulley or sprocket to a shaft. Because the bore is in the bushing rather than in the pulley, one pulley can fit different shaft sizes, and removal is simple. Match bushing type, bore size and keyway to the hub.
Open, shielded or sealed bearing: which one?
Open bearings take lubrication from the housing and suit gearboxes and oil-fed systems. Shielded bearings keep grease in against light dust; sealed bearings add contact seals that exclude more dirt and water but add friction. Choose to match the environment and speed.