#42 Weld-On Spindle - 7000lb Capacity - 2.25" Flanged Round Tail (SP-22542F-7.21)
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#42 Weld-On Spindle - 7000lb Capacity - 2.25" Flanged Round Tail
Precision-machined #42 tapered spindle for 7,000 lb axles. Features a pre-welded 5-bolt brake flange for standard 12" x 2.25" brake assemblies.
Overview
This R&P Carriages #42 weld-on spindle is a high-quality replacement solution designed for 7,000 lb axle applications where measurements and mounting points match. Engineered for heavy-duty trailer builds, the 7.21" extended tail ensures deep structural engagement when welded into a 3" axle tube. The integrated 5-bolt flange comes factory-welded, allowing for a direct bolt-on installation of standard 12" trailer brake backing plates.
R&P Service Insight
This is a solid-steel spindle (Non-Lubed). It is preferred by fabricators who prioritize maximum core strength for heavy equipment haulers and dump trailers.
- Deep Seat: The 7.21" tail allows for multiple plug-weld points.
- Standard Journals: Uses industry-standard 1.75" / 1.25" bearing set.
- Pro-Grade: 1045 cold-rolled steel construction.
R&P Knowledge Hub
Compatibility: Designed for use with #42 hubs and 12" x 2.25" brakes. Requires bearing 25580 (Inner) and 14125A (Outer).
Vehicle / System Fit: Standard fitment for 7,000 lb utility, flatbed, and tandem axle equipment trailers.
Installation Notes: Verify your axle tube ID is 2.25". Requires professional circumferential and plug welding to the axle tube.
Performance Insight: The non-lubed solid core design eliminates the internal hollow channel, offering higher resistance to bending under extreme radial loads.
Brand & Fitment Note
Selling Brand: R&P Carriages / Aftermarket Replacement
Application Reference: Any OEM names (e.g. Dexter) describe compatibility and fitment style only. This is an R&P Carriages curated component.
Before Ordering: Confirm your axle tube dimensions. This spindle tail is 2.25" round and intended for 3" OD tubing with appropriate wall thickness.
R&P Repair Insight
When replacing a bent or damaged spindle, always check the interior of your axle tube for debris or warping from the previous failure.
- Seal Check: Uses a 2.25" seal journal (Seal 10-36). Always use a new seal when installing a new spindle.
- Flange Alignment: The flange is pre-welded; ensure your axle tube is clocked correctly before welding the tail to the tube.
- Hub Fit: This spindle is compatible with 8-lug hubs designed for #42 spindle journals.
Features
Integrated 5-Bolt Flange
Factory-welded for precise alignment with 12" electric or hydraulic brake assemblies.
7.21" Extended Tail
Extra-long tail provides more surface area for structural welding and plug welds.
Solid Cold-Rolled Steel
Constructed from high-tensile 1045 steel for maximum durability under heavy loads.
Precision #42 Taper
Machined to exacting tolerances for standard 25580/14125A bearing combinations.
Specifications
| Part Number | SP-22542F-7.21 |
|---|---|
| Capacity | 3,500 lbs (7,000 lb Axle) |
| Tail Diameter | 2.25" Round |
| Tail Length | 7.21" |
| Brake Flange | 5-Bolt Pattern |
| Lubrication | Non-Lubed (Solid) |
Fitment / Application
| Inner Bearing | 25580 (1.750") |
|---|---|
| Outer Bearing | 14125A (1.250") |
| Grease Seal | 2.250" (10-36) |
| Axle Tube ID | 2.25" Round |
| Brake Size | 12" x 2.25" |
Included Components
| Quantity | Item |
|---|---|
| 1 | #42 Round Weld-on Spindle w/ 5-Bolt Flange |
| 1 | 1"-14 Spindle Castle Nut |
| 1 | 1" Spindle Washer |
| 1 | Cotter Pin |
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