3500 lb Electric Brake Drop Axle (3.5K) – 5 lug – (4″ Drop)

(3 customer reviews)


📦 Specs and Features:

  • Capacity: 3,500 lbs (3.5K)
  • Lug Pattern: 5 lug
  • Tube Size: 2 3/8″ diameter
  • Drop: Standard 4″
  • Brakes: Electric, 10×2.25 inches, not ABS compatible

Please reference our Min/Max Chart Below for Axle sizing.


Earn up to 8,990 Points.




Introducing the Ultimate in Towing Safety and Performance: Mrovi’s 3500 lb Electric Brake Drop Axle

Mrovi Trailer Parts proudly presents the 3500 lb Electric Brake Drop Axle, an essential upgrade for anyone seeking enhanced performance and safety in light-duty trailer applications. This axle is perfectly engineered for trailers used for hauling cargo, boats, ATVs, and more, providing not only improved functionality but also increased control during transportation.

Product Specifications:

Capacity: 3500 lbs

Lug Pattern: 5 lug

Tube Size: 2 3/8” diameter

Drop: 4” standard drop

Brakes: Electric, 10×2.25 inches, specifically designed for non-ABS applications

Key Features of the 3500 lb Electric Brake Drop Axle:

Pre-Greased: Comes pre-lubricated with high-temperature axle grease, enhancing durability and readiness for use.

Underslung Design: Features an underslung setup with a cambered tube, providing a lower ride height and facilitating easier loading and unloading.

High-Strength Steel Construction: Manufactured with robust steel, ensuring long-lasting durability and promoting even tire wear.

EZ Lube Design: Equipped with an EZ Lube system that includes a removable rubber plug on the hub cap for simple access to the grease-able zerk fitting.

Why Opt for Mrovi’s 3500 lb Electric Brake Drop Axle?

Enhanced Safety: The electric brakes significantly improve stopping power, essential for safely transporting heavy loads or navigating steep terrains.

Built to Last: The high-strength steel construction withstands the rigors of road travel and heavy use.

Ease of Installation: This axle is delivered fully assembled with loose spring seats for welding, which allows for a custom fit and straightforward installation.

Simple Maintenance: The EZ Lube design simplifies regular maintenance, allowing for quick lubrication without disassembling the axle.

Components Included:

Contains inner and outer bearings, tang washer, hub/dust/grease cap, cotter pin, outer race, inner race, and a double lip grease seal.

Versatile Applications:

The 3500 lb Electric Brake Drop Axle is designed to be a flexible solution for a wide range of trailers. Whether you are upgrading an old trailer or building a new one, this axle is compatible with utility trailers, boat trailers, ATV trailers, and more, enhancing their usability and performance.

Installation and Maintenance Advice:

Axle Alignment: Make sure the axle is properly aligned with your trailer frame to ensure balanced loading and optimal performance.

Brake Connection: Safely connect the electric brake wiring following the manufacturer’s guidelines.

Regular Inspections: Conduct routine inspections of the axle, brakes, and suspension components for any signs of wear, and lubricate regularly to maintain optimal functionality.

Tire Care: Maintain proper tire inflation to extend tire life and enhance the axle’s performance.


Investing in the 3500 lb Electric Brake Drop Axle from Mrovi Trailer Parts means equipping your trailer with a reliable, high-quality component that improves both safety and functionality. Upgrade today and experience the peace of mind that comes with knowing your trailer is ready for any challenge on the road.

2000 lb capacity 2K Idler Trailer Axle by Axis, featuring high-strength construction and EZ Lube Design, ideal for upgrading light-duty trailers.
Boost your trailer’s performance with the durable 2K Idler Trailer Axle, designed for light-duty trailers requiring reliable support.

Additional information


73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96

Bolt Pattern

5 x 4.5, 5 x 5

Axle Option

Axle only ($599), Complete Kit ($899)

Bolt Pattern

MROVI’s Guide for Measuring Trailer Axle Bolt Patterns

How to Measure your Trailer’s Wheel Bolt Circle Lug or Bolt Pattern

In order to replace a hub on your trailer, you will need to know the bolt pattern or lug pattern. Trailer wheel hub patterns can be defined by the number of bolts or lugs per wheel and the diameter of the circle that the bolts are arranged on.  Determining the bolt pattern is rather easy, but it is very important that accurate measurements are taken.  The majority of boat trailers on the road have a 4, 5 or 6 lug pattern.

Determining the bolt pattern on your trailer:

  1. You will need to first count the number of lug bolts on one wheel. Most trailer hubs typically have 4 or 5 lugs per wheel/hub. Heavier duty, higher capacity trailers generally have 6 or 8 Lugs per wheel.
  2. If the trailer hubs have an even number of bolts holding the wheel, measure from the center of one bolt to the center of the bolt directly opposite using a ruler, tape measure or caliper.  The hub lug bolt pattern will be determined by the number of lug bolts and the distance between the opposing hub bolt (see 4-lug hub diagram).  All but 5-lug patterns are measured in this manner.
  3. If your trailer wheel hubs have 5 lug bolts, measuring is slightly different. Choose any lug bolt and measure the distance between the back of one lug to the center of another that is directly across from it. Be sure that you skip one bolt when measuring.  You can measure the distance in either direction
NOTE:  If you are replacing older wheel hubs, wheels, integrated hub/drums or hub/rotors the bearings should be checked for wear and replaced as necessary. Always use a high-temperature wheel bearing grease when re-packing your trailers hubs.

Hub Face & Spring Center

Axle Min/Max Sizes

Chart displaying minimum and maximum sizes for trailer axles, including hub face to hub face, spring center, and overall length measurements
Chart showing the minimum and maximum sizes for trailer axles, including critical measurements such as hub face to hub face, spring center, and overall length. Ensure accurate measurements for optimal trailer performance and safety.

Understanding Min/Max Measurements for a Trailer Axle

When dealing with trailer axles, understanding the minimum and maximum measurements is crucial for ensuring a proper fit, safe operation, and optimal performance. These measurements help determine the correct axle size for your trailer and ensure it can handle the required load.

1. Hub Face to Hub Face (HF to HF) Measurement

  • Definition: The distance from the outer edge of one hub face to the outer edge of the other hub face.
  • Importance: This measurement determines the overall length of the axle and ensures that the wheels are correctly positioned under the trailer. The correct HF to HF measurement ensures that the wheels do not extend beyond the trailer’s sides or sit too far inward.

2. Spring Center (SC) Measurement

  • Definition: The distance between the center of one spring mount to the center of the opposite spring mount.
  • Importance: This measurement ensures the axle aligns properly with the trailer’s spring hangers. Correct spring center measurement is crucial for balanced load distribution and maintaining the trailer’s stability and alignment during towing.

3. Overall Length (OL) Measurement

  • Definition: The total length of the axle from end to end.
  • Importance: This includes the hub face distance and any additional parts extending beyond the hub faces. Knowing the overall length helps in understanding the space needed for axle installation and avoiding any potential obstructions.

Min/Max Measurements

Minimum Measurements:

  • Hub Face to Hub Face (HF to HF): The minimum HF to HF measurement ensures the wheels fit within the trailer frame without rubbing against the trailer’s body or fenders.
  • Spring Center (SC): The minimum SC measurement ensures that the axle can be securely mounted to the trailer frame with the existing spring hanger placements.
  • Overall Length (OL): The minimum overall length ensures the axle fits within the designated area of the trailer without interfering with other components.

Maximum Measurements:

  • Hub Face to Hub Face (HF to HF): The maximum HF to HF measurement ensures the wheels are not too far apart, which could lead to excessive stress on the axle and poor handling.
  • Spring Center (SC): The maximum SC measurement ensures the axle is adequately supported by the trailer’s spring hangers and prevents excessive flexing or bending.
  • Overall Length (OL): The maximum overall length ensures the axle does not extend too far beyond the trailer, which could affect the trailer’s balance and aerodynamics.

Why Min/Max Measurements Matter

  1. Safety: Ensuring that the axle fits within the specified measurements prevents issues such as improper wheel alignment, excessive tire wear, and instability during towing, which can lead to accidents.
  2. Performance: Proper axle measurements ensure balanced load distribution and optimal suspension performance, leading to a smoother and more efficient towing experience.
  3. Compliance: Adhering to the correct measurements ensures the trailer meets industry standards and regulations, preventing potential legal issues and ensuring roadworthiness.
  4. Durability: Correct axle fitment reduces stress on trailer components, preventing premature wear and extending the lifespan of the axle and associated parts.

Measuring Tips

  • Accurate Tools: Use a reliable measuring tape or laser measurement tool to ensure precision.
  • Level Surface: Ensure the trailer is on a level surface to avoid skewed measurements.
  • Multiple Checks: Measure multiple times to confirm accuracy, and consult the trailer manufacturer’s specifications for guidance.

By understanding and adhering to the minimum and maximum measurements for your trailer axle, you can ensure a safe, reliable, and efficient towing experience.

3 reviews for 3500 lb Electric Brake Drop Axle (3.5K) – 5 lug – (4″ Drop)

  1. Justin

    Great service ever. Trailer axles are best. I will give them five stars …

  2. Richard

    I found needed parts, they have car hauler and flat bed need parts as well, definitely do business with them. 3.5k axles beam are working properly

  3. Lashari

    Great prices. They talked to me in a very friendly way. Thanks Juan..

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