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High-capacity 3500 lb Idler Hub with a one-year limited warranty.
CSA & QAI Certified 3500 lb Idler Hub for utility and camping trailers.
CSA & QAI certified 3500 lb Idler Hub with pre-greased bearings.
Pre-greased 3500 lb Idler Hub for easy installation and long-lasting performance.
how to measure

3500 lb Idler Hub, 5 on 4.75 Inch Bolt Pattern

17-125
Estimated delivery dates: Apr 5, 2025 - Apr 7, 2025

$30.99 $119.98 48% OFF

Add to Cart
High-capacity 3500 lb Idler Hub with a one-year limited warranty.
3500 lb Idler Hub, 5 on 4.75 Inch Bolt Pattern
$30.99 $119.98 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 Idler Hub, 5 on 4.75 Inch Bolt Pattern

High-quality 3500 lb Idler Hub for reliable trailer performance.
This 3500 lb Idler Hub from AxleTek is designed to ensure smooth operation and safety on your trailer.

 

The AxleTek 3500 lb idler hub is a critical component for ensuring the safety and reliability of your trailer axles. Designed specifically for use on trailer idler axles with #84 spindles, this high-quality hub assembly features a sturdy iron construction and a zinc-enriched paint finish to withstand harsh conditions.

Key Features

  • Pre-Greased: No need to pack bearings; the hub comes pre-greased with lithium complex, multipurpose grease for easy installation and long-lasting performance.
  • Bearing Components Included: Inner bearing (L68149), outer bearing (L44649), inner race (L68111), outer race (L44610), and a grease seal (58846) are all included.
  • Fits Various Trailers: Compatible with standard axles from most manufacturers, including AxleTek, Dexter, Lippert (LCI), and AL-KO. It’s ideal for trailers ranging from utility to camping models.

Product Specifications

Application: 3,500-lb trailer axles with #84 spindles
Compatible Wheel Sizes: 13″ to 15″
Bolt Pattern: 5 on 4-3/4″
Wheel Stud Dimensions: 1/2″ diameter x 1-5/16″ long
Grease Cap Flange Diameter: 1.988″
Weight Capacity: 1,750 lbs
Warranty: Limited 1-year warranty

Bearing and Seal Information

  • Inner Bearing (L68149): Inner diameter of 1.378″
  • Outer Bearing (L44649): Inner diameter of 1.063″
  • Inner Race (L68111)
  • Outer Race (L44610)
  • Grease Seal: Included with inner diameter of 1.719″ and outer diameter of 2.565″

Determining the Bolt Pattern

The first number in the bolt pattern indicates the number of bolt holes, while the second number denotes the diameter in inches of the circle on which the bolt holes sit.

Even Number of Bolt Holes:

To measure for a wheel with an even number of bolt holes, such as 5 on 4-3/4″, measure from the center of one bolt hole to the center of the hole directly across from it.

Odd Number of Bolt Holes:

To determine the bolt-circle diameter for wheels with an odd number of bolt holes, like our 5 on 4-3/4″, measure from the center of any bolt hole to the point halfway between the two bolt holes directly across from the first.

Side Measurement:

Distance (D) Bolt Pattern
2-5/8″ 5 on 4-1/2″
2-3/4″ 5 on 4-3/4″
3″ 5 on 5″
3-1/4″ 5 on 5-1/2″

What Kind of Trailers Can Use This Hub?

The AxleTek 3500 lb idler hub is suitable for various trailer types, including utility trailers, camping trailers, and boat trailers. Its compatibility with standard axles from leading manufacturers ensures a seamless fit.

Signs Your Idler Hub Needs Replacement

  • Noisy Operation: Excessive noise or grinding sounds can indicate that the hub assembly needs to be replaced.
  • Loose Fit: If you notice any play or movement in the wheel, it’s a sign of worn-out bearings and races.
  • Lack of Lubrication: Worn seals can lead to grease leakage, reducing lubrication efficiency.

Maintenance Tips

To ensure the longevity of your idler hub assembly, follow these maintenance tips:

  1. Regular Inspections: Check for any signs of wear or damage during routine trailer inspections.
  2. Lubrication: Ensure that all moving parts are properly lubricated to prevent premature wear.
  3. Bearing Maintenance: Periodically check and replace bearings if they show signs of wear or corrosion.

Certifications

All products from Tow Parts, LLC are CSA and QAI certified. These certifications guarantee that our parts meet the highest standards for safety and performance (CSA, QAI).

Comparison to Competitors

Product Name Manufacturer Bolt Pattern Weight Capacity Warranty
KH-5475-07-19 AxleTek Trailer Idler Hub Assembly AxleTek 5 on 4-3/4″ 1,750 lbs Limited 1-year warranty
Dexter 84545BX Trailer Idler Hub Assembly Dexter N/A (varies) Varies by model Limited warranty varies by model

This high-quality 3500 lb idler hub from AxleTek is designed to provide reliable performance for your trailer. With its CSA and QAI certifications, you can trust it to meet the highest safety standards.

About Us:

At Tow Parts, LLC, we are dedicated to providing top-quality trailer parts and exceptional customer service. As the only authorized AxleTek parts distributor, we offer a wide range of CSA and QAI certified products that meet the highest safety standards. Our commitment to excellence ensures that our customers receive reliable components designed for durability and performance.

Customer Service:

At Tow Parts, LLC, we pride ourselves on delivering unparalleled customer service. Whether you need assistance with product selection, installation guidance, or technical support, our knowledgeable team is here to help. We understand the importance of getting your trailer back on the road quickly and safely, which is why we strive to provide prompt, professional service every step of the way.

From easy-to-navigate online ordering to comprehensive after-sales support, Tow Parts, LLC is committed to making your experience as seamless and stress-free as possible. Your satisfaction is our top priority!

Additional information

Weight 8.7 lbs
Dimensions 8 × 7 × 5 in
Quantity: No selection

One 3.5K Idler Hub, 5×4.75, Two 3.5K Idler Hub, 5×4.75

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Additional information

Weight 8.7 lbs
Dimensions 8 × 7 × 5 in
Quantity: No selection

One 3.5K Idler Hub, 5×4.75, Two 3.5K Idler Hub, 5×4.75

Product Brand

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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.