3,500 lb Electric Brake Axle Running Gear Set

3,500 lb Electric Brake Axle Running Gear Set (Single-Axle) — Rockwell American

Get your trailer stopping safely and reliably with this complete 3,500 lb electric brake axle running gear set from Rockwell American (a Dexter company). Designed for precise fitment and smooth tracking on utility, cargo, landscape, and light-duty equipment trailers.

Includes the axle, hubs, double-eye leaf springs, U-bolt kit, and hanger kit for a full setup. Features high-tensile strength tube, powder-coated finish, Posi-Lube spindles, and 10″ electric brakes for enhanced safety. Free Shipping in the Lower 48 states.

Rockwell American trailer axles are made in the USA with a 2-year manufacturer’s warranty, ensuring consistent tolerances and structural integrity for reliable performance.

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What’s Included in This 3,500 lb Electric Brake Axle Running Gear Set:

• (1) 3,500 lb Electric Brake Axle with Hubs: Pre-assembled with 5 on 4.5 bolt pattern hubs, bearings, seals, races, grease caps, lug nuts, and 10″ electric brakes for easy bolt-on installation and reliable stopping power.
• (2) Double-Eye Leaf Springs: 1.75″ wide, rated at 1,750 lbs each (3,500 lbs total), made from high-strength steel for smooth ride and load support—perfect for utility or cargo trailers.
• (1) U-Bolt Kit: Fits round 2.375″ axles with 5.5″ length and 1/2″-20 threads; includes tie plates, washers, and nuts for secure spring mounting and vibration resistance.

*Verify hub face, spring center and hub pattern in the options above. Selections may vary to match your trailer’s specs for a custom fit.

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Choose Your Axle Size (HF/SC Measurements)

Select the exact hub-face (HF) and spring-center (SC) measurements to match your trailer’s frame width, hanger spacing, and tire/fender clearance—ensuring safe, stable towing and preventing issues like rubbing or misalignment.

Hub-Face (HF): Measured from the outer face of one hub to the outer face of the other (across the full axle length). Common hub-face sizes range from 61″ to 95″ for standard trailers.

Spring-Center (SC): Measured from the center of one spring seat to the center of the other. This aligns with your trailer’s spring hanger brackets. Typically your spring center is 2″ less then your frame width.

Not sure which hub-face / spring-center (HF/SC) you need? Contact us—we’ll verify your measurements before you order. See our How to Measure a Trailer Axle guide or call (602) 292-9690.

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Key Features and Specifications

• Brand: Rockwell American (a Dexter company)—trusted quality with American-made durability.
• Axle type: Electric brake for added stopping power and safety on highways.
• Capacity: 3,500 lb GAWR for reliable performance on utility, cargo, and landscape trailers.
• Posi-Lube® Spindles: Enable quick, clean bearing service with grease zerk for reduced maintenance time and continuous protection, ensuring long-term reliability on the road.
• Powder-Coated Axle Tube: Provides superior corrosion resistance against weather and road salt, extending the life of your 3500 lb idler axle in tough conditions.
• 5 on 4.5 (5×4.5) bolt pattern: Fits most 5-lug 13″–15″ trailer tire & wheel assemblies; confirm your bolt pattern before ordering.
• Cambered axle tube: (2-3/8” OD) with underslung, pre-welded spring pads for stable tracking and a lower deck height.
• Technical Components:
  • Spindle Size: #84 with grease zerk for standard 3,500 lb applications.
  • Brake Drum: #94545 – 10″ x 2-1/4″ Hub & Drum For 3,500lb Axles
  • Backing Plates: #4701-L (left) and 4701-R (right). Brake assembly, Electric, 10″x.25″ (3.5k cap per pair)
  • Inner Bearing: L68149 (1.378″ ID)
  • Outer Bearing: L44649 (1.063″ ID)
  • Inner Race: L68111 (2.361″ OD)
  • Outer Race: L44610 (1.98″ OD)
  • Grease Seal: Part #10-19 (1.719″ x 2.565″)
  • Wheel Stud Size: 1/2″-20

*Verify hub face, spring center and hub pattern in the options above. Selections may vary to match your trailer’s specs for a custom fit.

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Documents & How-To Resources

Access these helpful guides and videos to install and maintain your 3,500 lb Electric Brake Axle Running Gear Set with confidence. Our resources cover everything from axle servicing to brake setup for optimal trailer performance.

• • Operation & Service Manual — Rockwell American Trailer Axles (PDF): Step-by-step instructions for maintenance, lubrication, and troubleshooting your Rockwell American axle.
  • Trailer Suspension Diagram & Hanger Kit Spacing (Image): Visual reference for single and tandem axle hanger spacing with double-eye springs—perfect for ensuring proper alignment during installation.
  • Johnson Trailer Parts — YouTube How-To Videos: Watch our tutorial videos on trailer assembly, axle replacement, and brake installation for kits like this one.

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Frequently Asked Questions (FAQs)

Got questions about the 3,500 lb Electric Brake Axle Running Gear Set? We’ve got answers to help you choose and install with confidence.

How do I measure hub-face (HF) and spring-center (SC)?

Measure HF from the outer face of one hub to the outer face of the other. Measure SC from the center of one welded spring seat to the other. Match both to your trailer’s hanger spacing and frame width for optimal tire/fender clearance and safe towing. See our How to Measure a Trailer Axle guide for diagrams and tips.

Will this kit fit my wheels?

This axle uses a 5 on 4.5 bolt pattern, common for many trailer wheels. Check your wheel’s bolt pattern (measure lug hole spacing) and center bore to confirm compatibility. Fits most 5 lug 13-15″ trailer wheels. If unsure, contact us with your specs for verification.

Do you have installation videos?

Yes—watch step-by-step installs, measurement tips, and maintenance guides on our YouTube channel. Search for “trailer axle installation” or check the video below for a quick overview.

Installation Video

Watch this quick video tutorial on installing a similar trailer axle running gear set—get tips on measurements, assembly, and common pitfalls to avoid for a smooth setup.

 

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Questions? We’re Here to Help with Your Trailer Axle Setup

Have questions about the 3,500 lb Electric Brake Axle Running Gear Set? Our experts can confirm your HF/SC measurements, bolt pattern compatibility, and even source custom sizes if needed. Get personalized advice to ensure a perfect fit for your trailer—reach out today for fast, friendly support.

Call (602) 292-9690, email sales@johnsontrailerparts.com, or use our Contact page.