3,500 lb Replacement Stub Axle Spindle Kit - 5 on 5 Bolt Pattern #84 Spindle
A complete repair solution designed to replace damaged or bent spindles on 3.5K trailer axles without requiring a full axle beam replacement.
Overview
This R&P Carriages Stub Axle Kit is a high-quality replacement solution designed for 3,500 lb trailer axles where measurements and mounting points match. It is the ideal choice for repairing bent or scored spindles, eliminating the high cost and intensive labor of swapping the entire axle tube. This stub end is engineered to be welded directly into your existing axle beam for a permanent, structural repair.
R&P Service Insight
Stub axle ends are precision components that act as the structural foundation for your hub assembly. Accuracy during the installation phase is paramount for long-term trailer health.
- Welding Prep: Proper alignment and "squaring" of the spindle to the axle beam are critical to prevent uneven tire wear and tracking issues.
- Bearing Care: Always hand-pack or tool-pack bearings with high-temperature grease before final hub assembly.
- Safety Check: This kit services a single side. Always inspect the opposite spindle and hub for wear while the trailer is jacked up.
R&P Knowledge Hub
Compatibility: Designed for standard 3,500 lb trailer axles utilizing #84 spindles with a 1-3/8" to 1-1/16" bearing step down.
Vehicle / System Fit: Common on utility trailers, car haulers, and specialized equipment trailers using 2" round or bored-out square tubing.
Installation Notes: Stub ends require professional-grade structural welding. Ensure the 2" diameter base fits securely into your tube before beginning the weld process.
Performance Insight: The 5 on 5" bolt pattern (approx. 4-3/4" stud spacing) is a specific configuration; verify your wheel bolt pattern to ensure total compatibility.
Brand & Fitment Note
Selling Brand: R&P Carriages / Aftermarket Replacement
Application Reference: Any OEM or platform names mentioned describe compatibility and application style only, based on industry-standard #84 spindle dimensions and 3.5K load ratings.
What This Means: This listing is for a curated R&P repair kit containing high-quality aftermarket components, not a specific axle manufacturer's branded original equipment unless otherwise stated.
Before Ordering: Verify your spindle type (#84), bearing numbers (L68149/L44649), and bolt pattern before purchase.
R&P Repair Insight
Replacing a stub axle is a major repair. Avoid common pitfalls by performing these three checks before the spindle is welded permanently to the axle beam.
- Check 1 (Fitment): Ensure the 2" round base of the spindle slides into your axle tube with minimal play to ensure a strong weld joint.
- Check 2 (Alignment): Use a straight edge or alignment tool to ensure the new spindle is perfectly parallel with the existing axle beam.
- Check 3 (Bearings): Verify your inner bearing is an L68149 (1.375" ID) and outer is an L44649 (1.063" ID) to match this #84 spindle profile.
Features
Cost-Effective Repair
Replaces only the damaged spindle section, saving the expense of a full axle beam and the labor of total removal.
Pre-Installed Races
The included idler hub comes with bearing races already pressed in, reducing assembly time and ensuring a precise fit.
2" Weldable Base
The SP-20084NWC spindle features a 2" round base designed specifically for secure, deep-penetration welding into axle tubes.
Complete Service Kit
Includes everything needed for one side: hub, bearings, seal, and hardware, ensuring all wear components are new.
Specifications
| Specification | Detail |
|---|---|
| Part Number | STUB-84FZ-550-H |
| Axle Rating | 3,500 lb |
| Spindle Type | #84 Spindle |
| Bolt Pattern | 5 on 5" |
| Inner Bearing | L68149 (1-3/8" ID) |
| Outer Bearing | L44649 (1-1/16" ID) |
| Spindle Base | 2.00" Diameter |
| Grease Seal | 10-19 (1.719" ID) |
Fitment / Application
| Category | Details |
|---|---|
| Vehicle / System | Utility, Car Hauler, Equipment Trailers |
| Primary Fit | 3,500 lb Straight or Drop Axles |
| Secondary Fit | Specialized Hub/Wheel 5-on-5" Apps |
| Notes | Requires professional welding. Verify the 5-on-5" pattern vs the common 5-on-4.5" before ordering. |
Included Components
| Quantity | Item |
|---|---|
| 1 | 3,500 lb Idler Hub (5 on 5" Pattern) with Races |
| 1 | #84 Spindle (SP-20084NWC) with 2" Base |
| 1 Set | L68149 Inner & L44649 Outer Bearings |
| 1 | Double Lip Grease Seal (10-19) |
| Kit | 1.98" Dust Cap, 1" Axle Nut, and Spindle Washer |
