Spanner bushings (also called shoulder bushings or spacers) — steel spacer sleeves that go between the caster frame and the wheel bearing. Maintains proper axle alignment, prevents the bearing from being squeezed, ensures the wheel spins freely. Required when the wheel is narrower than the caster frame gap. Stocked at our Mansfield, TX facility.
Spanner bushings are the small steel tubes that go around the axle between the caster frame and the bearings on each side. They keep the wheel centered and prevent the axle bolt from squeezing the bearings as it's tightened.
The bushing length must match the gap between caster frame and wheel hub on each side. Too short = bearing squeezed. Too long = wheel won't fit.
Inside diameter matches axle diameter. 5/16, 3/8, 1/2 inch most common.
Standard spanner bushings are zinc-plated steel. Stainless for wet environments.
When replacing just the wheel (not the whole caster), check if your existing wheel has spanner bushings — order replacements if needed.
Need help? Contact CasterHQ for support.
CasterHQ stocks 8 configurations at our Mansfield, TX facility. 99 percent ship same or next business day.
A steel spacer between caster frame and wheel bearing. Maintains proper alignment.
When replacing a caster wheel, check the existing spanner bushing. If worn or missing, replace.
Match axle diameter (5/16, 3/8, 1/2 inch) and length to your caster frame gap.
Zinc-plated steel standard. Stainless for wet/wash-down.
Sometimes — check listing.
99 percent same or next business day from Mansfield TX.
