Trailer Bearing Cone – 2.25" ID – Fits 382A Race, 10K GD Inner & 10K HD Outer Hub Applications
Replacement tapered roller bearing cone for compatible heavy trailer hub applications using bearing number 387A. Commonly referenced for 10K General Duty inner bearing use and 10K Heavy Duty outer bearing use where the hub, spindle, and race specifications match.
Key Measurements & Specs
| Specification | Detail |
|---|---|
| Part Number / SKU | 387A |
| Product Type | Tapered roller bearing cone |
| Inner Diameter | 2.250" |
| Matching Race | 382A race |
| Common Position | 10K GD inner / 10K HD outer where 387A is specified |
| Quantity Included | 1 bearing cone |
Fitment / Application
| Category | Details |
|---|---|
| Trailer System | Heavy trailer hub and axle bearing service |
| Primary Fit | Fits hubs requiring bearing number 387A |
| Race Compatibility | Used with matching 382A race |
| Fitment Method | Verify stamped bearing number, race number, spindle journal size, and hub application before ordering |
| Important Note | Application references are fitment guides only. Match the existing bearing and race numbers before installation. |
Top Features
| Feature | Buyer Benefit |
|---|---|
| 387A Bearing Number | Helps match the replacement bearing to the stamped number on the original component |
| 2.250" ID | Designed for compatible spindle journals requiring a 2.25" bearing bore |
| 382A Race Match | Pairs with the common 382A race when replacing bearing and race together |
| Heavy Trailer Use | Suitable for compatible heavy axle hub service where 387A is specified |
Overview
This listing is for one 387A tapered roller bearing cone with a 2.250" inner diameter. It is commonly used in heavy trailer hub applications, including compatible 10K General Duty inner bearing positions and 10K Heavy Duty outer bearing positions where the hub and spindle require bearing number 387A. The matching 382A race is sold separately unless purchased as part of a complete bearing and race kit.
R&P Service Insight
Bearing fitment should be confirmed by the actual bearing number and race number removed from the hub, not by axle capacity alone. Heavy trailer hubs can use different inner and outer bearing combinations depending on axle series, hub number, spindle, and production configuration.
- Match the Numbers: Confirm the existing bearing is stamped 387A before ordering.
- Check the Race: If the race is worn, pitted, grooved, or discolored, replace the matching 382A race at the same time.
- Inspect Before Reassembly: Check the spindle journal, seal surface, hub bore, and lubrication condition before installing the new bearing.
R&P Knowledge Hub
Compatibility: This bearing is intended for applications requiring bearing number 387A and a 2.250" bearing bore. Verify before ordering if your trailer has been modified, repaired previously, or fitted with non-original hubs.
Trailer / Axle Fit: Commonly referenced for heavy trailer axle hub service, including 10K General Duty inner bearing applications and 10K Heavy Duty outer bearing applications where 387A is specified.
Installation Notes: Bearings should be installed clean, properly lubricated, and adjusted according to the hub and axle service requirements. Do not reuse a damaged race with a new bearing.
Performance Insight: Correct bearing and race matching is critical for hub temperature control, load support, and long service life. A close-looking but incorrect bearing can cause premature wear or hub failure.
Brand & Fitment Note
Selling Brand: R&P Carriages aftermarket replacement trailer bearing
Application Reference: Dexter, 10K General Duty, 10K Heavy Duty, and hub-number references are used only as compatibility and application guides where the 387A bearing number and 382A race match the customer’s existing setup.
What This Means: This listing is for one replacement 387A bearing cone, not a complete bearing kit and not a guaranteed OEM-branded item unless specifically stated on the product packaging.
Before Ordering: Verify the bearing number, matching race number, spindle size, hub number, inner/outer bearing position, and quantity needed before installation.
R&P Repair Insight
When servicing heavy trailer hubs, replace parts based on measured condition and stamped part numbers. A failed bearing may also indicate lubrication loss, seal failure, improper adjustment, water intrusion, or race damage.
- Race Condition: Replace the 382A race if there is scoring, pitting, heat discoloration, or uneven wear.
- Seal Check: Inspect the hub seal and seal riding surface, especially on oil bath or heavy-duty hub assemblies.
- Adjustment Check: After installation, adjust bearing preload/endplay according to the axle and hub service procedure.
Features
387A Replacement Bearing
Replacement tapered roller bearing cone for hubs that require bearing number 387A.
2.250" Inner Diameter
Fits compatible spindle journals requiring a 2.25" bearing bore.
Pairs With 382A Race
Designed to run with a matching 382A bearing race when the race is also being replaced.
Heavy Trailer Hub Application
Commonly used in compatible 10K trailer axle hub service positions where 387A is specified.
Included Components
| Quantity | Item |
|---|---|
| 1 | 387A tapered roller bearing cone |
| Not Included | 382A race, seal, washer, nut, cotter pin, oil cap, grease, or other hub hardware |
