Caster wheel replacement parts — precision ball bearings, roller bearings, axles, spanner bushings, washers, bumpers, and hardware that wears out before the wheel does. 1/2″ and 3/8″ standard caster wheel sizes covered. Zinc-plated and stainless steel options. Stocked at our Mansfield, TX facility.
Match bearing ID to your wheel size, axle to your caster spec. Spanner bushings convert smaller-bore wheels to fit standard caster axle threads.
| Part Type | Common Size | Material | Use | Replaces |
|---|---|---|---|---|
| Precision Ball Bearing | 1/2" ID x 1-3/16" OD | Sealed Steel (Q34) | Inside caster wheel hub | Failed bearing — keeps wheel rolling |
| Roller Bearing | 1" ID x 1-15/16" OD | Carbon steel | 3"+ wide wheels | Worn straight roller bearing |
| Spanner Bushing | 1/2" ID x 3/4" OD | Steel | Bore reducer | Bushing wear, axle play |
| Spanner Bushing | 3/4" ID x 1" OD | Steel | 3" wide wheels | Worn bushing on heavy-duty wheel |
| Zerk Axle & Nut | 1/2" x 3-3/8" | Zinc-plated | Wheel-to-yoke pin | Bent or worn axle |
| Zerk Axle & Nut | 1/2" x 3-3/8" | Stainless steel | Washdown environments | Rusted axle |
| Flanged Combo Washer | 3/4" x 1-3/16" | Polymer | Reduces axle wear | Cracked nylon washers |
| Corner Bumper | 3" x 3" | Steel + Polyurethane | Cart corner protection | Damaged corner bumpers |
Look at the existing axle diameter on your caster. Most 4-5" industrial wheels use 1/2" ID bearings; 3" and smaller use 3/8". Standard 8-10" wheels use 5/8" or 3/4". Mismatch causes wheel wobble and premature failure.
Sealed precision ball bearings handle higher speeds and lower drag — the standard for poly and steel wheels. Straight roller bearings handle higher impact and shock loads — standard for cast iron and rubber-on-iron wheels. Match the replacement to what was originally specified.
A spanner bushing reduces a large axle hole to a smaller diameter. Width of bushing must match wheel hub width within 1/16". Too short and the wheel binds. Too long and the axle threads cannot tighten. Measure your wheel hub before ordering.
Zinc-plated is the default — handles 99% of indoor industrial use. Stainless is required for washdown environments (food, hospital, lab) and outdoor or salt-air exposure. Stainless costs ~3x zinc but lasts 5x longer in corrosive service.
Symptoms: wheel wobbles under load, rolls noisily, drags when pushed, won't free-spin when lifted off the floor. Bearings fail before wheels in most industrial applications — a $4 bearing replacement saves a $40 wheel replacement.
Most 4-5" industrial caster wheels use 1/2" ID x 1-3/16" OD sealed precision ball bearings (Q34 series). 3" wheels often use 3/8". Some heavy-duty 4" wheels use 5/8". Pull the existing bearing or measure the axle hole before ordering.
A spanner bushing (also called a reducer or sleeve) is a metal tube that fits inside a wheel's bearing bore to reduce the effective axle diameter. Lets you mount a wheel with a 5/8" bore on a 1/2" axle. Required when wheel bore and caster axle don't match.
Block the cart, remove the cotter pin from the axle nut, unscrew the nut, slide out the bolt, then remove the wheel. Insert the new axle, replace the wheel, hand-tighten the nut, install a new cotter pin. 5-10 minute job per caster.
Yes — stainless bearings work everywhere. The trade-off is cost (~3x zinc-plated). For dry indoor service, zinc-plated gives equivalent life. Specify stainless only where corrosion is a real factor: wet floors, food acids, sanitizers, salt air, outdoor exposure.
Yes — browse our wheel collections (shop-wheels) for replacement wheels. This collection is for the small hardware parts that wear out separately from the wheel itself: bearings, bushings, axles, washers, and bumpers.
Precision (Q34 / ABEC-rated) sealed ball bearings are pre-loaded and pre-greased for industrial caster use — longer life, lower drag, less noise. Cheaper bearings are unsealed and require periodic re-greasing. Specify precision for any caster that sees daily use.
Industrial duty cycle: 3-5 years on properly sized bearings. Heavy duty cycle (daily multi-shift use): 1-2 years. Light duty cycle (warehouse stockroom, occasional use): 8-10 years. Replace when symptoms appear, not on a fixed schedule.
