Hybrid 8K Trailer Hub Drum Service Kit – 8 on 6.5 – 9/16" Studs – Bearings, Seal & Oil Cap
Complete one-side hybrid hub drum service kit for matching 8000 lb trailer axle applications. Includes hub drum, bearings, grease seal, oil cap, center plug, O-ring, and eight 9/16"-18 coned lug nuts.
Overview
This R&P Carriages hybrid hub drum service kit is built around the 99-865-916HD hub drum for matching 8000 lb trailer axle applications. The kit includes the hub drum and matching service components listed in the B.O.M.: inner bearing, outer bearing, grease seal, oil cap, center oil plug, O-ring, and eight coned lug nuts. This is intended as a complete one-side hub drum service kit when all listed specifications match the trailer being serviced.
R&P Service Insight
This is sold as a complete kit, but fitment still needs to be confirmed against the trailer’s existing hub drum, spindle, cap, seal, and wheel hardware.
- Kit Fitment: Confirm the full kit matches your axle application, not just the hub drum number.
- Bearing Match: Verify the 25580 inner bearing and 2475 outer bearing before ordering.
- Seal / Cap Match: Confirm the 10-225 grease seal and 21-35 oil cap style before installation.
R&P Knowledge Hub
Compatibility: Complete hybrid hub drum kit for matching 8000 lb trailer axle applications using the listed bearing, seal, cap, and lug hardware combination.
Trailer / System Fit: 8 x 6.5 wheel bolt pattern with 9/16" studs and included 9/16"-18 coned lug nuts.
Installation Notes: Match the bearing numbers, grease seal size, cap size, stud size, wheel bolt pattern, and axle application to your existing trailer parts before ordering.
Performance Insight: This replacement kit does not increase the trailer’s GVWR. Always follow the lowest-rated component in the axle, suspension, wheel, tire, frame, and coupler system.
Brand & Fitment Note
Selling Brand: R&P Carriages trailer parts listing.
Application Reference: Hybrid hub drum kit, 8000 lb, 8 x 6.5, AM, 9/16" stud, with bearings, cap, and grease seal. Comparable to Lippert Hybrid L347627-style applications where all measurements and components match.
What This Listing Includes: One complete hub drum kit with all B.O.M. components listed below.
Before Ordering: Verify measurements, bearing numbers, seal size, cap thread, stud size, wheel pattern, axle application, and included components before installation.
R&P Repair Insight
When installing a hub drum kit, inspect the complete spindle and brake area before reassembly. A correct kit can still fail early if installed over a damaged spindle, worn brake assembly, or mismatched seal surface.
- Check the Spindle: Look for scoring, heat marks, pitting, or damage at the bearing journals and seal surface.
- Check the Brakes: Inspect shoes, magnets, springs, adjusters, and backing plate condition before installing the drum.
- Check the Wheel Hardware: Confirm wheel compatibility with an 8 x 6.5 bolt pattern and 9/16" studs.
Features
Complete Hub Drum Kit
Sold as one complete kit with hub drum, bearings, grease seal, oil cap components, O-ring, and lug nuts included.
8000 lb Application
Listed for matching 8000 lb trailer axle hub drum applications where all component specifications match.
8 x 6.5 Wheel Pattern
Built around an 8-lug hub drum using an 8 x 6.5 bolt circle for matching trailer wheel applications.
9/16" Stud Setup
Uses 9/16" studs and includes eight 9/16"-18 coned lug nuts for one hub drum position.
Specifications
| Specification | Detail |
|---|---|
| Kit SKU / Part Number | 99-865-916HD-G-KIT |
| Selling Brand | R&P Carriages |
| Product Type | Hybrid hub drum service kit |
| Listed Capacity | 8000 lb application |
| Hub Drum Included | 99-865-916HD |
| Bolt Pattern | 8 x 6.5 |
| Stud Size | 9/16" |
| Lug Nut Size | 9/16"-18 coned lug nut |
| Quantity Sold | One complete kit |
Fitment / Application
| Category | Details |
|---|---|
| Axle Application | Matching 8000 lb trailer axle hub drum applications |
| Wheel Pattern | 8 x 6.5 |
| Seal Reference | 10-225 grease seal, 2.25" x 3.38" |
| Application Reference | Comparable to Lippert Hybrid L347627-style applications where the existing hub drum, bearing set, seal, cap, stud size, and wheel bolt pattern match. |
| Fitment Notes | Confirm the full kit contents match your axle, spindle, hub drum, cap, seal, bolt pattern, and stud size before ordering. |
Detailed Measurements
| Key Dimension | Measurement |
|---|---|
| Bolt Pattern | 8 x 6.5 |
| Stud Size | 9/16" |
| Lug Nut Thread | 9/16"-18 |
| Grease Seal Size | 2.25" x 3.38" |
| O-Ring Size | 2.609" I.D. x .139" |
| Oil Cap Reference | 21-35, Dexter-style reference, 2.875"-12 |
Complete Kit Includes / B.O.M.
| Kit Qty | Part Number | Component Included In Kit |
|---|---|---|
| 1 | 99-865-916HD | Hub drum, 8000 lb listed application, 8 x 6.5, AM, 9/16" stud |
| 1 | 25580 | Bearing, 1.75" I.D., fits 25520 race / 12" drum / big hubs |
| 1 | 2475 | Bearing, 1.25" I.D., fits 02420 race / 7200 lb / 8000 lb axle applications where matched |
| 1 | 10-225 | Grease seal, 2.25" x 3.38", fits matching post-90 5200 lb / 6000 lb / 8000 lb style applications |
| 1 | 21-35 | Oil cap, Dexter-style reference, 2.875"-12, 6K-8K and pre-89 9K reference, fits matching Lippert-style applications |
| 1 | 046-032-00 | Oil plug, center plug for hole in center of oil cap |
| 1 | 010-045-00 | O-ring, 2.609" I.D. x .139", for 021-035-00 / 21-35 style cap applications |
| 8 | 6-053 | 9/16"-18 coned lug nuts |
