Fulton trailer bearing protectors replace the plain outer grease cap with a spring-loaded protector that helps maintain grease pressure and resist water intrusion. Unlike an ordinary steel dust cap, a protector has a serviceable grease fitting. The protector body must match the machined hub bore, and the optional vinyl cover must match the protector diameter.
Compare actual products available from NewRVParts
Each photo leads to the exact corresponding store listing. Identify the part number before choosing a replacement.
BPC1980604 — Fulton 1.980-Inch Wheel Bearing Protectors With CoversSpring-loaded bearing protectors, pair, with vinyl dust covers
BP244S0604 — Fulton 2.441-Inch Trailer Bearing ProtectorsSpring-loaded bearing protectors, pair; covers not listed
BB19800112 — Fulton Vinyl Covers for 1.980-Inch Bearing ProtectorsTwo flexible vinyl covers, without bearing protectors
001505 — Fulton 1.988-Inch Trailer Hub Grease Cap1.988-inch nominal grease cap, zinc-plated steel
001520 — Fulton 2.446-Inch Zinc-Plated Trailer Hub Cap2.446-inch nominal cap with a taller crown profile
Compare the exact Fulton protector parts
| Fulton MPN | Listed diameter | What's in the package |
|---|---|---|
| BPC1980604 | 1.980 in | Pair of spring-loaded chrome-plated steel protectors with dust covers |
| BP244S0604 | 2.441 in | Pair of spring-loaded chrome-plated steel bearing protectors; no vinyl covers listed |
| BB19800112 | 1.980 in protector | Two vinyl replacement dust covers only |
| 001505 | 1.988 in grease-cap diameter | One plain steel grease cap, not a spring-loaded protector |
| 001520 | 2.446 in grease-cap diameter | One plain steel grease cap, not a bearing protector |
How the parts differ
| Component | Function |
|---|---|
| Protector metal body | Seats in a suitable hub opening and carries the spring-loaded pressure mechanism. |
| Grease fitting | Allows grease service through the protector body according to the maker's instructions. |
| Pressure mechanism | Maintains the protector's internal spring-loaded grease pressure; does not replace the axle grease seal. |
| BPC1980604 included covers | Covers the grease-fitting end to reduce road dirt and splash exposure. |
| BB19800112 replacement covers | Two-piece vinyl cover package for the matching 1.980-inch Fulton protector, not the 2.441-inch version. |
| BP244S0604 protector kit | Larger nominal 2.441-inch protector; do not order using the 1.980-inch cover part number. |
| Ordinary 001505/001520 grease caps | Passive press-in dust caps without a grease fitting or spring-loaded protector action. |
| Hub bore and seal condition | Confirm the hub's machined seating diameter and inspect the axle seal before relying on a protector. |
Before ordering or installation
Do not treat a 1.980-inch bearing protector as a confirmed substitute for a 1.988-inch grease cap, or a 2.441-inch protector as automatically fitting any 2.446-inch cap application. Those are different manufacturer specifications; check the actual hub opening and the protector installation requirements. Excessive greasing can damage a hub seal. Service bearings and replace damaged seals according to the axle manufacturer's instructions.