Rockwell American 3,500 lb Electric Brake Trailer Axle Kits
Build, repair, or upgrade your trailer with genuine Rockwell American 3,500 lb Electric Brake Trailer Axle Kits designed for utility, cargo, landscape, enclosed, boat, ATV, UTV, and light equipment trailer applications. Available in Axle Only, Suspension Kit, Build Kit, and Running Gear Kit configurations with multiple hub face, spring center, and bolt pattern options to match your trailer.
Features include 10″ x 2-1/4″ electric brake assemblies, Posi-Lube® greaseable spindles, a durable cambered axle beam, double-eye leaf springs on applicable kit levels, and optional 15″ wheels with ST205/75R15 radial trailer tires. Built for dependable braking performance, simplified maintenance, and long-term towing reliability.
Free shipping in the lower 48 states.
Price range: $575.00 through $1,020.00
Rockwell American 3,500 lb Electric Brake Trailer Axle Kits
Build, repair, or upgrade your trailer with a Rockwell American 3,500 lb Electric Brake Trailer Axle Kit designed for dependable towing performance and confident braking. These kits are well suited for utility trailers, cargo trailers, landscape trailers, enclosed trailers, boat trailers, ATV trailers, UTV trailers, and other light-duty single-axle applications.
Choose from Axle Only, Suspension Kit, Build Kit, or Running Gear Kit configurations to match your project. Whether you are replacing a worn axle, rebuilding your trailer suspension, or constructing a trailer from the frame up, each package provides a practical combination of compatible axle and running gear components.
Rockwell American trailer axles are part of the Dexter family of trailer axle brands and feature pre-installed 10″ x 2-1/4″ electric brake assemblies, Posi-Lube® greaseable spindles, a cambered axle beam, and a durable powder-coated finish. Multiple hub face, spring center, and bolt pattern options are available to fit a wide range of trailer applications.
Made in America. Free Shipping in the Lower 48 States.
Compare Kit Options
Select the trailer axle package that best matches your trailer repair, replacement, or new trailer build requirements.
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| Included Components | Axle Only | Suspension Kit | Build Kit | Running Gear Kit |
|---|---|---|---|---|
| Rockwell American 3,500 lb Electric Brake Axle | ✓ | ✓ | ✓ | ✓ |
| Double-Eye Leaf Springs | — | ✓ | ✓ | ✓ |
| U-Bolt Kit | — | ✓ | ✓ | ✓ |
| Single-Axle Hanger Kit | — | — | ✓ | ✓ |
| 15″ 5-Lug Wheels | — | — | — | ✓ |
| ST205/75R15 Radial Trailer Tires | — | — | — | ✓ |
Axle Only: Includes one genuine Rockwell American 3,500 lb electric brake trailer axle with pre-installed electric brake assemblies, hub-and-drum assemblies, and Posi-Lube® greaseable spindles. Ideal for replacing an existing axle while reusing compatible suspension components.
Suspension Kit: Includes the electric brake axle, double-eye leaf springs, and a U-bolt kit. This package is well suited for replacing worn axle, braking, and primary suspension components while retaining an existing hanger system.
Build Kit: Includes everything in the Suspension Kit plus a complete single-axle hanger kit. Ideal for new trailer fabrication, frame-up builds, and complete suspension replacement.
Running Gear Kit: Includes everything in the Build Kit plus matching 15″ wheels and ST205/75R15 radial trailer tires. This is the most complete configuration for new trailer construction or major running gear replacement.
Axle Only and Suspension Kit configurations are commonly selected for repairs and partial upgrades. Build Kit and Running Gear Kit configurations are better suited for complete trailer builds and major rebuilds.
Choose Your Axle Size (Hub Face / Spring Center)
Select the hub face (HF) and spring center (SC) measurements that match your trailer frame and suspension setup. Correct measurements help provide proper wheel positioning, suspension alignment, tire clearance, and overall trailer fitment.
Hub Face (HF): Measure from the wheel-mounting surface on one hub to the wheel-mounting surface on the opposite hub.
Spring Center (SC): Measure from the center of one spring seat to the center of the opposite spring seat.
- Matching the correct hub face and spring center dimensions helps ensure proper fender clearance, spring alignment, wheel positioning, and trailer tracking.
Important: Always measure your existing axle before ordering. Do not select an axle based only on trailer deck width, frame width, fender spacing, or overall trailer width.
Not sure which axle size you need? Read our How to Measure a Trailer Axle Guide or contact us, and we’ll help verify your measurements before you order.
Why Choose Rockwell American?
- Made in America: Genuine Rockwell American axle components manufactured in the USA for dependable fitment and towing performance.
- Dexter Family of Brands: Rockwell American is supported by one of the most recognized names in the trailer axle industry.
- 3,500 lb Axle Capacity: Designed for many utility, cargo, landscape, enclosed, boat, ATV, UTV, and light equipment trailer applications.
- Integrated Electric Brakes: Includes pre-installed 10″ x 2-1/4″ electric brake assemblies for controlled trailer braking.
- Posi-Lube® Spindles: Integrated grease fittings simplify routine bearing lubrication without removing the hubs.
- Cambered Axle Beam: Designed to support proper wheel tracking and tire contact when the axle is loaded.
- Powder-Coated Finish: Provides a durable protective coating for regular road and trailer use.
Electric Brake Axle Performance
Each axle includes pre-installed 10″ x 2-1/4″ electric brake assemblies and matching hub-and-drum assemblies. When connected to a properly installed trailer brake wiring system and compatible in-cab brake controller, the electric brakes help provide controlled stopping support for the trailer.
Proper brake adjustment, wiring, grounding, breakaway-system operation, and brake-controller setup are required for safe and dependable performance. Brake assemblies should be inspected and serviced as part of routine trailer maintenance.
Posi-Lube® Spindle System
Rockwell American Posi-Lube® spindles include built-in grease fittings that direct lubricant through the spindle and into the hub assembly. This design makes routine bearing lubrication more convenient and helps support dependable hub and bearing performance.
Posi-Lube® does not eliminate the need for periodic hub inspection, bearing service, brake inspection, seal replacement, or proper trailer maintenance.
Common Applications
- Utility Trailers
- Cargo Trailers
- Landscape Trailers
- Enclosed Trailers
- Boat Trailers
- ATV and UTV Trailers
- Small Equipment Trailers
- Farm and Property Trailers
- Custom Single-Axle Trailer Builds
Fitment & Capacity Notes
- Verify the selected hub face and spring center measurements before ordering.
- Confirm the selected bolt pattern matches your existing or planned trailer wheels.
- Verify wheel, tire, suspension, brake, and trailer frame ratings before loading.
- Check for adequate tire, fender, and frame clearance throughout the suspension’s full range of movement.
- Confirm your tow vehicle has a compatible brake controller and properly functioning trailer wiring.
- The axle’s 3,500 lb rating does not determine trailer payload or GVWR by itself.
- Final trailer capacity is limited by the lowest-rated component in the complete trailer system.
- Hanger installation, alignment, and welding should be completed by a qualified trailer fabricator when applicable.
Frequently Asked Questions
What is included with each kit configuration?
Axle Only includes the Rockwell American electric brake axle. The Suspension Kit adds double-eye leaf springs and a U-bolt kit. The Build Kit adds a single-axle hanger kit. The Running Gear Kit adds matching 15″ wheels and ST205/75R15 radial trailer tires.
How do I measure my trailer axle?
Measure the hub face from one wheel-mounting surface to the opposite wheel-mounting surface. Measure the spring center from the center of one spring seat to the center of the opposite spring seat. Visit our How to Measure a Trailer Axle Guide for additional help.
What size brakes are included?
These Rockwell American 3,500 lb electric brake axles include pre-installed 10″ x 2-1/4″ electric brake assemblies with matching hub-and-drum assemblies.
Do I need a trailer brake controller?
Yes. Electric trailer brakes require a compatible brake controller in the tow vehicle, properly connected trailer wiring, and a functioning breakaway system where required.
What are Posi-Lube® spindles?
Posi-Lube® spindles use an integrated grease fitting and internal lubrication passage to help direct grease into the hub assembly during routine maintenance.
Can I reuse my existing trailer springs?
Yes, provided your existing springs match the axle capacity, spring width, spring length, and mounting configuration. Many customers choose the Suspension Kit or Build Kit when replacing worn suspension components at the same time.
Does the axle include springs and mounting hardware?
Only the Suspension Kit, Build Kit, and Running Gear Kit include springs and U-bolt hardware. The hanger kit is included only with the Build Kit and Running Gear Kit.
Does the Running Gear Kit include wheels and tires?
Yes. The Running Gear Kit includes matching 15″ wheels and ST205/75R15 radial trailer tires in addition to the axle and suspension components.
What trailers commonly use this axle?
These 3,500 lb electric brake axle kits are commonly used on utility, cargo, landscape, enclosed, boat, ATV, UTV, and other light-duty single-axle trailers.
Resources & Downloads
- Rockwell American Trailer Axle Service Guide
- Trailer Hanger Kit Spacing Guide
- How to Measure a Trailer Axle
- Johnson Trailer Parts YouTube Channel
Installation Video
Watch our video for helpful information about trailer axle measurements, installation, brake setup, suspension alignment, and replacement axle selection.
Need Help?
Need help selecting the correct axle size, bolt pattern, or kit configuration? Our knowledgeable team can help verify your measurements and fitment before you order.
Call or Text: (602) 292-9690
Email: sales@johnsontrailerparts.com
Verify your trailer axle specifications below to help ensure proper fitment, bearing compatibility, suspension alignment, and towing performance.
| Brand | Rockwell American |
|---|---|
| Axle Capacity | 3,500 lbs GAWR |
| Axle Type | Electric brake axle |
| Brake Type | Electric brakes |
| Brake Size | 10″ x 2-1/4″ |
| Available Configurations | Axle Only, Suspension Kit, Build Kit, or Running Gear Kit |
| Bolt Pattern Options | 5 on 4.5″ or 5 on 5″ depending on selected option |
| Lubrication System | Posi-Lube® greaseable spindles |
| Spindle Type | Straight #84 spindles |
| Axle Beam | 2-3/8″ OD round cambered axle tube |
| Leaf Springs | Double-eye 4-leaf trailer springs, 25.25″ eye-to-eye |
| Spring Pads | Underslung, pre-welded spring seats |
| Camber | Yes |
| Hub Face (HF) | Varies by selected option |
| Spring Center (SC) | Varies by selected option |
| Includes Hanger Kit | Included with Build Kit and Running Gear Kit configurations |
| Wheel & Tire Package | Included on Running Gear Kit configurations |
| Wheel Size | 15″ 5-lug trailer wheels |
| Tire Size | ST205/75R15 |
| Tire Type | Radial trailer tires |
| Inner Bearing | L68149 |
| Outer Bearing | L44649 |
| Inner Race | L68111 |
| Outer Race | L44610 |
| Grease Seal | 10-19 double-lip grease seal |
| Wheel Stud Size | 1/2″-20 |
| Country of Origin | Made in USA |
| Warranty | 2-Year Manufacturer Warranty |
