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ProAxles 8K Trailer Axle Beam - 8000 lb Capacity, 3.5-inch Tube
Customizable ProAxles 8K Trailer Axle Beam - 8000 lb Capacity
ProAxles 8000 lb Trailer Axle Beam with Underslung Design
ProAxles 3.5K Trailer Axle Beam - 3500 lb Electric Brake - 5 Lug for Custom Trailers

8K Trailer Axle – 8000 lb Beam Only

08BMPA
Estimated delivery dates: Apr 5, 2025 - Apr 7, 2025

$499.00 $799.99 17% OFF

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ProAxles 8K Trailer Axle Beam - 8000 lb Capacity, 3.5-inch Tube
8K Trailer Axle - 8000 lb Beam Only
$499.00 $799.99 17% OFF

Trailer Axles FAQ

Downloadable Files

Files that will help teach you or guide you in finding the measurements for your Trailer Axles. 

4, 6, 8 Bolt Pattern
5 Bolt Pattern (option 1)
5 Bolt Pattern (option 2)
Printable Bolt Pattern Finder
Spring Center & Hubface

Trailer Axle Measurement Guide – TowParts.com

When working with trailer axles, a few key measurements are essential to ensure proper fitment and performance. Accurate measurements are crucial to avoid unnecessary wear, damage, or safety issues. Below, we’ll explain how to measure your axle with confidence.

Getting Started

To make the process easier, it’s best to remove your tires and wheels before taking measurements. This allows for more precise readings. If removing them isn’t possible, you can measure from the center of one tire to the center of the opposite tire. Having a friend assist by holding one end of the tape measure is helpful but not absolutely necessary.

Hub Face Measurement

What is it?

The hub face measurement is the distance from the outer face of one hub (where the wheel mounts) to the outer face of the opposite hub. This is the most important measurement when replacing or upgrading an axle.

How to measure:

1.Hook your tape measure to the outer face of one hub (the side facing the wheel).

2.Extend the tape measure across the axle to the outer face of the hub on the opposite side.

3.Be careful not to measure to the inside face of the hub—measure only to the outer face for accuracy.

Spring Center Measurement

What is it?

The spring center measurement is the distance between the centers of the leaf springs. This measurement is critical for proper axle placement and load distribution. If the springs are installed incorrectly, it can lead to bent axles and unsafe towing conditions.

How to measure:

1.Have a friend hold one end of the tape measure at the exact center of one spring.

2.Stretch the tape measure to the exact center of the opposite spring.

3.If you’re working alone, hook the tape measure on the outside edge of one spring and measure to the inside edge of the opposite spring. Subtract the width of the spring to determine the center-to-center distance.

Tips for Accurate Measurements

•Always double-check your measurements before ordering or installing a new axle.

•If you’re unsure or need help, reach out to our experts at TowParts.com for guidance.

•Use a high-quality tape measure with clear markings to avoid errors.

Pro Tip: Keep these measurements handy when contacting TowParts.com for axle replacements or upgrades. Our team is happy to assist you with any questions or concerns!

 

Trailer Axle and Hub Selection Guide – TowParts.com

Proper axle positioning and hub selection are essential for building or repairing your trailer. Here’s a detailed guide to help you make the right choices with confidence.

How to Purchase the Correct Trailer Hub or Drum

Selecting the right hub or drum is a critical step in repairing your trailer axle. Follow these simple steps to ensure you get the correct fit:

Step 1: Remove the Hub or Drum

Carefully remove the hub or drum from your trailer axle. This will allow you to measure and inspect the components for identification.

Step 2: Measure the Bolt Pattern

Determine your axle’s capacity by measuring the bolt pattern. This step is crucial if the capacity is unknown. Use a bolt pattern diagram to identify the correct measurements.

Helpful Tip: A 5-lug bolt pattern can sometimes be tricky. Use our bolt pattern guide for accurate results.

Step 3: Identify the Bearings and Seal

1.Remove the front and rear bearings and the seal from the hub.

2.Look for numbers stamped on the bearings. These numbers correspond to the spindle size.

3.If the numbers are not readable, measure the inside dimensions of the bearings and seal using calipers.

4.Refer to our bearing measurement guide for step-by-step instructions.

Step 4: Select the Best Hub or Drum for Your Needs

Once you have the measurements and information, choose the hub or drum that fits your requirements.

Need Help?

If you’re unsure, the TowParts.com team is here to assist! We’ll guide you through selecting the correct hub or drum to ensure a perfect fit for your trailer.

Why Choose TowParts.com?

•Expert Assistance: Our knowledgeable team is ready to help with your trailer needs.

•High-Quality Products: We offer durable, reliable parts built to last.

•Comprehensive Resources: Explore our website for diagrams, measurement guides, and installation tips.

For more information, contact us at 1 (888) HAUL 360 or visit TowParts.com. Let us help you get back on the road safely and efficiently!

Description

Product Overview

ProAxles 8K Trailer Axle Beam - 8000 lb Capacity, 3.5-inch Steel Tube
High-strength 8K Trailer Axle Beam with 3.5-inch steel tube for heavy-duty trailers

Upgrade your trailer with the ProAxles 8K Trailer Axle Beam—a robust, high-performance axle beam designed to handle heavy-duty loads with ease. With a 8,000 lbs capacity, this axle beam is perfect for a wide range of applications, from utility trailers to car haulers. Engineered with precision and built from high-strength steel, it ensures stability, durability, and a smooth ride every time you hit the road.

Key Features of our 8K Trailer Axle Beam – 8000 lb Capacity:

  • High-Capacity Design: 8,000 lbs weight capacity, ideal for heavy-duty trailers.
  • Durable Construction: 3.5″ high-strength steel tube provides exceptional stability and longevity.
  • Underslung Configuration: Spring seats welded on the bottom allow for a lower ride height, enhancing stability.
  • Customizable Fit: Designed to accommodate various hub, brake, and bearing configurations (sold separately).
  • Easy Integration: Compatible with industry-standard components for seamless replacement or upgrade.

Specifications of our 8K Trailer Axle Beam – 8000 lb Capacity:

  • Weight Capacity: 8,000 lbs
  • Axle Tube Diameter: 3.5″
  • Axle Type: Straight axle beam with underslung design
  • Finish: Raw steel or black powder-coated (options may vary)
  • Spindle Type: Standard spindles compatible with 8K hub and brake assemblies (sold separately)
  • Spring Centers: Customizable to fit your trailer’s requirements
  • Hub Face Length: Customizable for precise fitment

Features:

  • High-Strength Spindle Welds: Ensures durability and peace of mind during heavy-duty operations.
  • Compatibility: Designed for use with double eye springs for optimal performance.
  • Versatile Applications: Suitable for utility trailers, car haulers, landscape trailers, flatbeds, livestock trailers, cargo trailers, enclosed trailers, RVs, dump trailers, lowboys, and more.
  • Underslung Design: Allows for a lower ride height, enhancing stability and ease of loading.

Why Choose ProAxles?

  • Lifetime Transferable Warranty on Spindle Welds: Confidence in our craftsmanship means peace of mind for you.
  • 100% Interchangeability: Our axle beams are designed to seamlessly replace your current setup without compatibility issues.
  • Superior Quality Assurance: Manufactured under stringent quality controls to meet and exceed industry standards.
  • Exceptional Traceability: Each axle beam is fully verified for accuracy in bearing adjustment on each wheel end, backed by extensive manufacturing expertise.

Application:

Ideal for heavy-duty applications, the ProAxles 8K Trailer Axle Beam is built to handle demanding loads with ease. Whether you’re hauling equipment, vehicles, livestock, or large cargo, this axle beam provides the reliability and performance you need.

fast shipping 🚛

We offer fast shipping to the lower 48 states on all trailer axle beam purchases, delivering ProAxles’ unmatched quality right to your door.

Unmatched Quality and Performance

ProAxles stands out in the trailer axle industry by combining innovation with superior durability. Our 8K Trailer Axle Beam features 40% stronger spindle welds compared to other manufacturers, ensuring it can withstand the rigors of frequent use and heavy loads without compromising safety or performance. Investing in ProAxles means investing in an axle beam that is built to last.

Customize Your Axle Beam

The axle beam is designed to be compatible with a variety of hubs, brakes, and bearing kits (sold separately), allowing you to tailor your setup to your specific needs. Whether you require specific bolt patterns, brake configurations, or bearing setups, this axle beam provides a solid foundation for your custom trailer build.

Upgrade Your Trailer Today

Enhance your trailer’s performance and reliability with the ProAxles 8K Trailer Axle Beam. With its robust construction, customizable options, and industry-leading warranties, it’s the perfect choice for those who demand the best for their trailers.

Order Now and Get Back on the Road

Don’t let a worn-out axle slow you down. Order your new 8K Trailer Axle Beam today and experience the ProAxles difference. With fast shipping and a product that’s ready for your customization, you’ll be back on the road in no time.

Need Components?

We offer a full range of compatible components sold separately, allowing you to complete your axle assembly according to your specific requirements:

  • Hub/Drum Assemblies
  • Electric Brake Assemblies
  • Bearing Kits
  • Brake Flanges
  • Spring Seats and U-Bolt Kits

Contact Us

For any questions or assistance with your purchase, feel free to contact our customer support team. We’re here to help you find the perfect fit for your trailer needs.

Experience the ProAxles Advantage

With over 200 years of combined axle manufacturing expertise, ProAxles delivers products that meet the highest standards of quality and performance. Choose ProAxles for unmatched durability, reliability, and peace of mind on every journey.

Additional information

Weight N/A
Dimensions N/A
Hubface / Spring Center: No selection

75/56 (5'0), 95/78 (6'10") + $100, Custom Hubface / Spring Center (+ 2 Weeks) + $200

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Additional information

Weight N/A
Dimensions N/A
Hubface / Spring Center: No selection

75/56 (5'0), 95/78 (6'10") + $100, Custom Hubface / Spring Center (+ 2 Weeks) + $200

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What You Need to Know When Ordering Your New Trailer Axle

How To Measure your Hub Face for Your Trailer Axle

The hub face measurement (also known as the axle track) is one of the most important measurements you’ll need to find when replacing your axle.

The hub face (where your axle contacts the wheel and tire) is measured from the outer edge of one hub face to the outer edge of the opposite hub face.

Missing your axle hub? Try measuring brake-flange-to-brake-flange instead.

 This method isn’t quite as accurate as the hub face measurement, but if your axle’s hubs are missing, you can use what’s called a brake flange measurement instead. Measure from the outside face of one brake flange to the outside face of the opposite brake flange.Most axles have a standard amount of space between the brake flanges and hubs, depending on the axle size. If you know what capacity your axle is and you know your brake flange measurement, just add the standard flange-to-hub dimension to your brake flange length to obtain your hub face measurement. So what’s the standard distance between brake flanges and hubs? it depends on the axle’s weight capacity. For instance, 3,500-lb axles generally have 3″ between each flange and hub. So if we add 6″ (3″ for each side) to our brake flange measurement, we get our hub face number. (See our chart below for the correct number of inches to add to your brake flange measurement.)

How To Find Your Spring Center Measurement

The spring center measurement might be the most important to get right. You want to make sure your new axle’s springs are located in the same place as the old ones so they don’t obstruct the wheels, tires, or other components on your trailer. While holding your tape measure in the center of your spring, measure to the center of the opposite spring. (You’ll use the same method regardless of whether your trailer’s springs are mounted above or below the axle.)

Tip: If you don’t have a friend nearby to hold the end of the tape measure, you can still get this measurement solo. By hooking your tape measure on the outside edge of one spring, you can then measure to the inside edge of the other spring. This measurement will be identical to a center-to-center measurement.

Other Identifying Axle Features

Axle Capacity / Tube Diameter

Choose a new axle with the same capacity as your current axle. You can usually find your capacity on a sticker or stamp on the axle (or sometimes on the trailer itself, if your axles came OEM). If you can’t find your capacity this way, you can narrow it down by measuring the tube diameter.

A Wheel Bolt/Lug Pattern

Your trailer’s wheel bolt pattern is another feature you can use to find the axle you need. Specific bolt patterns are commonly seen on specific axle sizes

How to Measure a Broken Trailer Axle

If your trailer has Multiple Axles

If your trailer axle has been through it and is bent or damaged in some way, you may not be able to use the traditional measurements. In this case, here are a few other options.

If your trailer has a Single Axle

If you’ve only got one axle to work with, you might still be able to find your hub face measurement, even if your axle doesn’t have brake flanges. If your axle has brake flanges, use the brake flange to brake flange measurement we discussed above. 

If your axle doesn’t have brake flanges, and one of your hubs is missing or your axle is broken from the outer edge of the leaf spring, you can use the method below to find your measurement. (You cannot use this method if your axle has broken anywhere between the two leaf springs.

This will prevent you from measuring accurately, leading to an incorrect hub face measurement.)

  • Measure the distance from the center of one leaf spring to the outside edge of the hub face(measurement A)
  • Double the value 
  • Add the value to your spring center measurement

How To Measure your Bolt Pattern

For Hubs and Drums with Even Number of Bolts

To measure between the holes on a wheel with an even number of holes, simply measure from the center of one bolt hole to the center of its opposite to determine the diameter of the lug pattern.

For Hubs and Drums with Odd Number of Bolts

Measuring the diameter of a bolt circle with an odd number of lugs isn’t as straightforward.

You can’t measure straight across because there is no opposite bolt hole.

However, there are a few ways to get around this and figure out the bolt pattern you need for your new wheel.

Option 1

Measure from Center to Edge

An easy way to determine bolt hole circle diameter on wheels with 5 bolt holes is to measure from the center of one bolt hole to the farthest edge of one of the two farthest holes.

Option 2

Measure to Imaginary Bolt Hole Center

Measure from the center of one bolt hole to a point on the rim where the bolt hole would be on an odd-lug wheel. You must guess where this point is located if you want to measure the diameter this way.

Option 3

Measure Adjacent Holes

You can also measure the center-to-center distance of adjacent holes. Then, compare the distance to those in the list below to find the circle diameter.

Distance:

2-5/8″ – The bolt pattern is 5 on 4-1/2
2-3/4″ – The bolt pattern is 5 on 4-3/4
3″ – The bolt pattern is 5 on 5
3-1/4″ – The bolt pattern is 5 on 5-1/2