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Starting at $17.95, AutoBuffy stocks 1 wheel bearing dust caps from Elring. A dust cap is the small press-fit or threaded cover that seals the center of a hub or drum, blocking dirt, water, and road debris from reaching the wheel bearing and grease. When it's missing, cracked, or corroded, contamination accelerates bearing wear and can lead to premature failure.
The most important variable is fitment: dust caps are sized by outer diameter and depth, and even a few millimeters off will prevent proper seating or allow the cap to fall out. Beyond fit, choose between OE-style steel caps, grease-filled caps for serviceable bearings, and plastic or snap-in caps used on sealed bearing assemblies.
| Option | Best for | What you get |
|---|---|---|
| OE-Style Stamped Steel Cap | Daily drivers and direct OEM replacement | Press-fit steel construction matching original dimensions; resists deformation and stays seated over bumps and temperature cycles |
| Grease-Filled / Pre-Greased Cap | Trailer axles, boat trailers, and serviceable tapered bearing hubs | Cap pre-loaded with grease that continuously lubricates the bearing; extends service intervals in wet or corrosive environments |
| Plastic Snap-In Cap | Modern sealed hub assemblies and light-duty applications | Lightweight, corrosion-proof cover for hubs that use sealed bearings requiring no re-greasing; typically a low-cost protective cover only |
| Stainless Steel or Zinc-Plated Cap | High-moisture environments, coastal driving, or frequent off-road use | Enhanced corrosion resistance over standard steel; maintains a tight press fit longer in conditions that cause ordinary caps to rust and loosen |
Removing the old cap typically requires prying around its perimeter with a flat tool while working evenly to avoid distorting the bore. The new cap is seated by tapping it in with a rubber mallet or a dedicated cap driver, working around the edge to keep it level until it sits flush and feels secure with no wobble. If the bearings are serviceable tapered-roller units, inspect and repack the grease before driving the new cap home.