Swivel Casters

Swivel offset (also called lead distance or caster offset) is the horizontal distance between the vertical pivot axis of the swivel and the centerline of the wheel axle. When you push the equipment, the wheel trails behind the pivot point -- just like a shopping cart wheel. Proper offset ensures the wheel self-aligns smoothly to the direction of travel. Too little offset causes shimmy and instability at speed. Too much offset increases the turning radius and requires more effort to steer.

A brake locks the wheel to prevent rolling. A swivel lock locks the swivel raceway to prevent rotation, effectively converting a swivel caster into a rigid caster. A top-lock brake does both -- it locks the wheel and the swivel simultaneously. Use a brake when you need the equipment to stay put. Use a swivel lock when you want rigid (straight-line) tracking during transit. Use a top-lock when you need complete immobility.

A precision raceway uses hardened steel races (the channels the balls run in), uniform hardened ball bearings, and tight machining tolerances. This results in smooth rotation under load, consistent performance over time, and resistance to flat-spotting or galling. Economy casters may use stamped (unhardened) races that deform under heavy loads, leading to rough swiveling and premature failure.

You can, but steering becomes difficult. A cart with four swivel casters can turn in any direction, which is excellent for tight spaces but makes straight-line pushing challenging because the casters do not track a consistent direction. The standard recommendation is two swivel and two rigid for general-purpose carts. All-swivel configurations work best in tight quarters where the cart only needs to move short distances.

Our swivel caster selection is the largest category in our inventory, spanning every duty class from light-duty furniture casters rated at 75 lbs to kingpinless industrial models rated above 5,000 lbs per caster. Wheel diameters range from 1.5 inches to 12 inches, and tread materials cover the full spectrum: soft rubber, hard rubber, polyurethane, cast iron, phenolic, nylon, polypropylene, and forged steel. Mounting options include top-plate, threaded stem, grip ring stem, grip neck stem, and expanding adapter configurations. Optional brakes are available in cam-brake, top-lock, and side-lock styles.

The performance of a swivel caster depends on raceway quality, swivel offset geometry, and bearing type. Our medium-duty and heavy-duty swivel casters use precision ball-bearing raceways with hardened races for consistent, low-effort swiveling over years of use. The swivel offset -- the horizontal distance between the vertical swivel axis and the center of the wheel axle -- determines how easily the caster trails behind the direction of travel. Properly engineered swivel offset prevents flutter, shimmy, and dead spots that plague lower-quality casters.