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Secure 3500 lb idler hub for heavy-duty trailer axles.
Reliable 3500 lb trailer idler hub for safe towing.
Strong and durable 3500 lb idler hub for trailer axles.
Quality 3500 lb idler hub assembly designed for trailer axles.
how to measure

3500 lb Idler Hub, 5 on 5.5 Inch Bolt Pattern

17-120
Estimated delivery dates: Apr 6, 2025 - Apr 8, 2025

$30.99 $119.89 48% OFF

Add to Cart
Secure 3500 lb idler hub for heavy-duty trailer axles.
3500 lb Idler Hub, 5 on 5.5 Inch Bolt Pattern
$30.99 $119.89 48% OFF

Trailer Axle Hub and Drum 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

Answer:

•Identify the Bolt Count: Start by counting the number of bolt holes (e.g., 4, 5, 6, or 8).

•Measure the Pitch Circle Diameter (PCD):

For even bolt patterns, measure from the center of one bolt directly across to the opposite bolt.

For odd-number patterns, measure from the. center of one, skip one, to the center outside of the third.

• Check Consistency: Double-check your measurements to ensure that your wheel or drum will fit properly.

• Visual Inspection: Look for cracks, rust, or uneven wear on the hub face and drum.

• Feel for Vibration or Wobbling: When driving, any noticeable vibrations or misalignment can indicate that the hub or drum is warped or worn.

• Regular Inspection: Check the hub and drum at least once per season or before heavy towing. Look for signs of wear, rust, or damage.

• Cleaning: Keep the surfaces clean to remove any dirt or corrosion that could affect fitting and performance.

• Lubrication: Apply grease where recommended to reduce friction and prevent rust, following the manufacturer’s guidance.

• Professional Servicing: If you notice misalignment or significant wear, consult a trailer specialist to resurface or replace the components.

• Improper Fitment: A wrong bolt pattern or hub face measurement can result in wheels or brake drums not fitting securely.

• Poor Performance: Misalignment may lead to vibrations, increased tire wear, or even brake issues.

• Safety Risks: Ultimately, incorrect measurements can compromise the trailer’s handling and increase the risk of accidents during towing.

• Corrective Action: If you discover issues, it’s important to re-measure, adjust, or consult a professional for repairs or replacement to ensure a safe setup.

Description

3500 lb AxleTek Trailer Idler Hub Assembly – 5 on 5.5 Inch Bolt Pattern

SKU: 17-120

High-quality 3500 lb idler hub assembly for trailer axles.
Reliable and durable 3500 lb idler hub designed to fit various trailer axles. Perfect for utility, camping, horse trailers.

Overview and Features

The 3500 lb AxleTek Trailer Idler Hub Assembly is designed to provide reliable performance for your trailer. This robust 3500 lb Idler Hub, compatible with a wide range of trailer axles, is specifically engineered for use on idler axles and is capable of handling up to 1750 lbs per side (total capacity up to 3500 lbs).

  • Sturdy Iron Construction: Built with a heavy-duty iron body that can withstand the rigors of constant towing.
  • Zinc-Enriched Paint Finish: Provides extra protection against corrosion and rust, ensuring longevity.
  • Pre-Greased for Easy Installation: The hub assembly is pre-greased, making installation quick and hassle-free without the need to pack bearings manually.
  • Limited 1-Year Warranty: Backed by AxleTek’s commitment to quality and customer satisfaction.

Specs

The AxleTek 3500 lb Idler Hub is designed with versatility in mind, fitting a variety of trailer axles. Here are the key specifications:

  • Weight Capacity: 1750 lbs per side (total capacity up to 3500 lbs).
  • Bolt Pattern: 5 on 5.5 inches.
  • Wheel Size Compatibility: Fits wheels ranging from 13″ to 15″.
  • Grease Cap Flange Diameter: 1.988 inches.

3500 lb Idler Hub Bearing, Race, and Seal Information

The 3500 lb Idler Hub includes all necessary components for a complete installation:

  • Inner Bearing (Included): L68149 with an inner diameter of 1.378 inches.
  • Outer Bearing (Included): L44649 with an inner diameter of 1.063 inches.
  • Races (Included):
    • Inner race: L68111
    • Outer race: L44610
  • Grease Seal (Included): Model 58846 with an inner diameter of 1.719 inches and an outer diameter of 2.565 inches.

Determining the Bolt Pattern

To ensure you have the correct hub assembly for your trailer, it’s essential to measure the bolt pattern accurately:

3500 lb Idler Hub Bolt Pattern – Even Number of Holes:
Measure from the center of one bolt hole to the center of the hole directly across from it.
3500 lb Idler Hub Bolt Pattern – Odd Number of Holes:
Measure from the center of any bolt hole to the point halfway between the two holes directly across from it.

To further assist in identifying your 3500 lb Idler Hub’s bolt pattern, measure the distance (D) from the center of one bolt hole on the wheel to the center of a bolt hole right next to it:

  • If D = 2-5/8 inches, then the bolt pattern is 5 on 4-1/2 inches.
  • If D = 2-3/4 inches, then the bolt pattern is 5 on 4-3/4 inches.
  • If D = 3 inches, then the bolt pattern is 5 on 5 inches.
  • If D = 3-1/4 inches, then the bolt pattern is 5 on 5-1/2 inches.

When to Replace Your 3500 lb Idler Hub

Your trailer’s idler hub may need replacement if you notice any of the following signs:

  • Noisy Operation: Excessive noise coming from your wheel can indicate a failing bearing or seal.
  • Visible Damage: Cracks, dents, or other visible damage on the hub assembly.
  • Inability to Turn Freely: If your wheel does not turn freely when you try to spin it by hand.

3500 lb Idler Hub Maintenance Tips

To keep your trailer idler hub in top condition, follow these maintenance tips:

  • Lubrication Check: Regularly inspect the grease seal to ensure it is not damaged and that there are no signs of leakage. Apply new lubricant if necessary.
  • Tightening Lug Nuts: Ensure all lug nuts are tight but do not over-tighten, which could damage the wheel hub assembly.
  • Inspect for Wear: Check regularly for any signs of wear or damage to the bearings, races, and seals. Replace components as needed.

A well-maintained idler hub can significantly extend the life of your trailer axle and reduce unexpected breakdowns on the road. It’s crucial to perform regular checks and replacements when necessary to ensure safety and reliability.

3500 lb Idler Hub Compatibility

The 3500 lb AxleTek Trailer Idler Hub Assembly is compatible with standard axles from most manufacturers, including Dexter, Lippert (LCI), and AL-KO. It’s designed to fit a variety of trailer types:

  • Utility Trailers: Ideal for hauling equipment, tools, or other heavy-duty items.
  • Camping Trailers: Perfect for RV enthusiasts looking for reliable towing performance.
  • Horse Trailers: Ensures safety and comfort when transporting horses over long distances.
  • Pickup Truck Towing Accessories: Suitable for trailers used with pickup trucks, providing secure and stable transportation.

Tips for Installation

When installing the 3500 lb AxleTek Trailer Idler Hub Assembly, follow these steps to ensure proper installation:

  1. Preparation: Remove old components and clean any debris from the hub area.
  2. Bearing Installation: Ensure bearings are properly seated in their races. Apply fresh grease if necessary.
  3. Lug Nuts: Tighten lug nuts to the manufacturer’s recommended torque specifications.
  4. Final Check: Inspect all components for correct alignment and fitment before finalizing installation.

Maintaining your trailer idler hub is essential for ensuring optimal performance and safety during towing. Regular checks, proper installation, and timely replacements can help prevent costly breakdowns and ensure a smooth ride every time you hit the road.

CSA and QAI Certified

All of our products, including the 3500 lb Idler Hub,  are CSA (Canadian Standards Association) and QAI (Quality Assurance International) certified. This ensures that each hub assembly meets the highest safety standards and is rigorously tested for durability and performance. For more information, visit their websites:

Why Choose Tow Parts, LLC?

Tow Parts, LLC is the only authorized AxleTek Technologies parts distributor in the United States. We pride ourselves on offering high-quality trailer parts and exceptional customer service.

  • Authorized Distributor: As an authorized distributor, we provide genuine AxleTek Technologies parts that meet or exceed industry standards.
  • Expertise: Our team of experts is here to help with any questions you may have about installation, maintenance, and troubleshooting.
  • Customer Service: We prioritize customer satisfaction and provide reliable support throughout your purchasing journey.

If you need assistance or have questions about the 3500 lb AxleTek Trailer Idler Hub Assembly, feel free to contact our knowledgeable team. We’re here to ensure that your trailer is always in top condition for any towing adventure.

Order Today!

For more information or to order your 3500 lb AxleTek Trailer Idler Hub Assembly today, visit Tow Parts, LLC. We are dedicated to providing you with the best products and services in the trailer parts industry.

Additional information

Weight 9.5 lbs
Dimensions 8.5 × 7.5 × 4.5 in
Quantity: No selection

One 3.5K Idler Hub, 5×5.5, Two 3.5K Idler Hub, 5×5.5

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Additional information

Weight 9.5 lbs
Dimensions 8.5 × 7.5 × 4.5 in
Quantity: No selection

One 3.5K Idler Hub, 5×5.5, Two 3.5K Idler Hub, 5×5.5

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What you need to know before ordering

Simple Instructions for Measuring a Trailer Hub and Drum Bolt Pattern and Other Considerations Before Purchasing a Replacement

Part 1: Measuring the Bolt Pattern

Understanding your trailer’s bolt pattern is crucial when selecting a replacement hub and drum. Here’s how to measure it:

Step 1: Identify the Number of Lug Holes

• Count the Lug Holes: Determine how many bolt holes (lugs) are on your hub or wheel. Common configurations are 4, 5, 6, or 8 lug holes.

Step 2: Measure the Bolt Circle Diameter (BCD)

The method to measure the bolt circle diameter varies depending on whether you have an even or odd number of lugs.

For Hubs with an Even Number of Lugs (4, 6, 8 lugs):

1. Measure Across the Center:

• Place a ruler or measuring tape over the center of the hub.

• Measure from the center of one lug hole directly across the hub to the center of the opposite lug hole.

2. Record the Measurement:

• This distance is your bolt circle diameter.

Example: If the distance between opposite lug holes is 4 inches, your bolt pattern is “4 on 4” (4 lugs on a 4-inch circle).

For Hubs with an Odd Number of Lugs (5 lugs):

1. Measure from Center to Outer Edge:

• Measure from the center of one lug hole to the outer edge of a lug hole that is directly across from it (skipping one lug hole in between).

2. Alternatively, Use the Chord Measurement Method:

• Measure the Distance (D) between two adjacent lug holes (center to center).

• Use a Multiplier: Multiply this distance by 1.7012 to calculate the bolt circle diameter.

text{Bolt Circle Diameter (BCD)} = D times 1.7012

3. Record the Measurement:

• Round to the nearest common bolt pattern size (e.g., 4.5 inches, 5 inches).

Example: If the distance between adjacent lug holes is 2.75 inches:

text{BCD} = 2.75” times 1.7012 approx 4.68”

This approximates a 5 on 4.5” bolt pattern.

Step 3: Determine the Bolt Pattern Notation

• Express the Bolt Pattern: Use the format “[Number of Lugs] on [Bolt Circle Diameter]”.

Examples:

• “4 on 4” means 4 lugs on a 4-inch circle.

• “5 on 4.5” means 5 lugs on a 4.5-inch circle.

Part 2: Other Important Considerations Before Purchasing a Replacement Hub and Drum

To ensure safety and compatibility, consider the following factors before buying a replacement hub and drum:

1. Axle Capacity

• Know Your Axle Rating: Check your trailer’s axle weight capacity (e.g., 2,000 lbs, 3,500 lbs).

• Match the Hub and Drum: Purchase a hub and drum assembly rated for the same capacity.

2. Spindle Type and Bearing Sizes

• Identify Spindle Type: Determine if you have a straight or tapered spindle.

• Check Bearing Numbers:

• Remove the hub to access the bearings.

• Look for part numbers stamped on the bearings (e.g., L44649, L68149).

• Measure Bearings if Needed:

• Inner Bearing ID: Diameter of the inner bearing opening.

• Outer Bearing ID: Diameter of the outer bearing opening.

• Ensure Compatibility: The new hub must accommodate the same bearing sizes.

3. Grease Seal Size

• Check Seal Numbers: Look for part numbers on the grease seal.

• Measure if Unmarked:

• Inner Diameter (ID): Diameter where the seal fits over the spindle.

• Outer Diameter (OD): Diameter where the seal fits into the hub.

• Match Seal Size: The new grease seal must match these dimensions to prevent leaks.

4. Brake Type and Compatibility

• Determine Hub Type Needed:

• Idler Hub: For trailers without brakes.

• Hub and Drum Assembly: For trailers with drum brakes.

• Brake Size Compatibility:

• Ensure the drum matches your brake assemblies (common sizes are 7”, 10”, 12”).

• Check Brake Hardware:

• Verify that the hub is compatible with your existing brake components.

5. Wheel Compatibility

• Confirm Bolt Pattern: Ensure the new hub’s bolt pattern matches your wheel.

• Check Wheel Stud Size:

• Common stud sizes are 1/2”-20 or 9/16”-18 threads.

• Center Bore and Offset:

• Make sure the hub’s center bore fits your wheel.

• Consider wheel offset if applicable.

6. Spindle Type: EZ-Lube vs. Standard

• Identify Spindle Type:

• EZ-Lube Spindle: Has a grease fitting on the end for easy lubrication.

• Standard Spindle: Requires manual greasing.

• Select Compatible Components:

• Choose hubs and dust caps designed for your spindle type.

7. Material and Finish

• Environmental Considerations:

• For marine or coastal use, consider galvanized or stainless steel hubs to resist corrosion.

• Durability:

• Quality materials extend the life of your hub and drum.

8. Tools and Supplies Needed

• Essential Tools:

• Wrenches or sockets for lug nuts and spindle nuts.

• Torque wrench for proper tightening.

• Pliers or cutters for cotter pins.

• Supplies:

• High-temperature wheel bearing grease (if not pre-greased).

• Grease gun (for EZ-Lube spindles).

• Safety equipment (gloves, eye protection).

9. Installation Tips

• Proper Torque:

• Follow manufacturer specifications for tightening lug nuts and spindle nuts.

• Safety Checks:

• After installation, check for proper wheel rotation and absence of play.

• Regular Maintenance:

• Periodically inspect and grease bearings to extend the life of your hubs.

10. Consult Manufacturer Specifications

• Owner’s Manual:

• Review your trailer’s manual for specific requirements.

• Professional Advice:

• If unsure, consult with a trailer technician or dealer.

By carefully measuring your bolt pattern and considering these factors, you’ll ensure that you purchase the correct replacement hub and drum for your trailer, leading to safe and reliable performance on the road.