12K Trailer Hub Assembly Kit — 8 on 6.5 — 5/8"-18 Studs
Complete 12,000 lb trailer hub kit with bearing cups installed, bearings, oil seal, oil cap, and eight 6-108 lug nuts for heavy-duty brake drum applications.
Overview
This complete 12K trailer hub assembly is commonly used on heavy-duty trailer brake drum applications. It uses an 8 on 6.5 bolt pattern, 5/8"-18 pressed-in wheel studs, and pre-installed bearing cups, and it is commonly used as a replacement for Dexter 8-214 style hubs. The kit includes the matching inner and outer bearings, oil seal, oil cap, and eight 6-108 lug nuts so the wheel end arrives as a ready-to-service package.
R&P Service Insight
On heavy-duty hubs, getting the bearing, seal, and stud package right matters just as much as matching the bolt pattern. A hub can look correct at a glance and still be wrong at the spindle.
- Bolt Pattern: Confirm the wheel uses an 8 on 6.5 pattern before ordering.
- Bearing Match: Verify the spindle is set up for 3984 inner and 28682 outer bearings.
- Hardware Included: This kit is intended to include eight 6-108 lug nuts with the hub assembly.
R&P Knowledge Hub
Compatibility: Common replacement for Dexter 8-214 style heavy-duty trailer hubs used in brake drum applications.
Vehicle / System Fit: Heavy-duty trailer axle wheel ends using an 8 on 6.5 bolt pattern, 5/8"-18 studs, 3984 inner bearing, 28682 outer bearing, and 3.125" ID oil seal.
Installation Notes: Verify spindle dimensions, bearing numbers, seal size, wheel bolt pattern, and brake compatibility before installation.
Performance Insight: A complete hub kit helps reduce downtime and missed parts at installation, especially when servicing heavy-duty drum hubs in the field or shop.
R&P Repair Insight
Before ordering or installing a heavy-duty hub, match the wear components to the spindle and confirm that the hardware package matches the wheel end you are servicing.
- Bearing Check: Confirm 3984 inner and 28682 outer bearing numbers on the existing setup.
- Seal Check: Verify the hub uses oil seal 010-056-00 with a 3.125" ID requirement.
- Stud / Nut Check: This hub uses 5/8"-18 studs and should include eight 6-108 lug nuts with the kit.
Features
Heavy-Duty Hub Assembly
Built for 12K brake drum applications and commonly used as a Dexter 8-214 style replacement.
8 on 6.5 Bolt Pattern
Matches common heavy-duty trailer wheel applications using the standard 8-lug pattern.
5/8"-18 Stud Setup
Uses 5/8"-18 pressed-in wheel studs and is intended to include eight matching 6-108 lug nuts.
Ready-to-Service Kit
Bearing cups are installed, and the kit includes bearings, seal, oil cap, and lug nut hardware.
Specifications
| Specification | Detail |
|---|---|
| Part Number | 99-86512-H-KIT-LN |
| Product Type | Trailer Hub Assembly Kit |
| Application | 12K brake drum hub application |
| Material / Finish | Heavy-duty hub assembly with pre-installed bearing cups and studs |
| Key Measurement | 8 on 6.5 bolt pattern |
| Fitment | Dexter 8-214 style hub application |
| Bearing Set | Inner 3984 / Outer 28682 |
| Seal / Stud Size | 010-056-00 seal / 5/8"-18 studs |
Fitment / Application
| Category | Details |
|---|---|
| Vehicle / System | Heavy-duty trailer axle brake drum wheel end |
| Primary Fit | 12K trailer hub application using 8 on 6.5 wheels |
| Secondary Fit | Common replacement for Dexter 8-214 style hubs |
| Notes | Verify spindle dimensions, bearing numbers, seal size, and brake compatibility before ordering. |
Included Components
| Quantity | Item |
|---|---|
| 1 | 12K hub assembly with bearing cups installed and 5/8"-18 wheel studs pre-installed |
| 1 | Inner bearing 3984 |
| 1 | Outer bearing 28682 |
| 1 | Oil seal 010-056-00 (3.125" ID) |
| 1 set | Oil cap and eight 6-108 lug nuts for 5/8"-18 studs |
