Trailer Idler Hub Kits 5 on 4.5 in for 3500 lb Axles - Set of 2

In this review of the Trailer Idler Hub Kits 5 on 4.5 in for 3500 lb axles, the bottom line is straightforward: these kits are aimed at trailer owners who need a cost-effective way to rebuild or replace idler hubs without swapping the entire axle. The reviewer found the complete set-spindles, bearings, seals, EZ lube caps and hardware-gives a practical, one-stop repair option for 3500 lb trailer axles, delivering solid durability from alloy steel construction and clear packaging that protects parts in transit.

Key Features

• Complete kit: Each set includes 2 axle spindles, 2 hubs, bearings, seals, grease caps and nuts so a full wheel end service can be completed without sourcing extra parts.
• #84 spindle fit: The included spindles have a 1.75 in largest diameter and 8.25 in overall length, matching common #84 trailer axle applications for a straightforward fit.
• Load capacity: Rated for 3500 lb axles with a spindle capacity of 1750 lb per wheel, suitable for single-axle and tandem setups where each wheel carries that load.
• Alloy steel construction: The hubs and spindles use alloy steel for improved corrosion resistance and long-term durability under towing conditions.
• Packaged for protection: Parts arrive in bubble boxes to reduce risk of damage during shipping, so components are ready for installation on arrival.
• Hardware included: The kit supplies cotter pins, spindle nuts, washers and ten cone wheel nuts, reducing the need to purchase complementary fasteners.

Who It's For

The kit suits DIY trailer owners, small fleet operators, and repair shops that service 3500 lb trailer axles and want a single-purchase solution for idler hub replacement. It is especially useful when the spindle and hub need to be replaced together and the customer prefers to avoid sourcing individual bearings and seals separately.

Those who should look elsewhere include owners of heavier commercial trailers or nonstandard axles that require different spindle sizes or bolt patterns. Also, if a vehicle needs a matched factory hub with a specific brand warranty, this universal-style kit may not be the right choice.

Pros & Cons

Pros

• Comes as a near-complete wheel end package so most installations need no extra parts.
• Alloy steel hubs and spindles offer solid corrosion resistance and longevity for towing use.
• Clearly a cost-effective option compared with replacing an entire axle assembly.
• Packaging protects components, reducing arrival damage and simplifying inspection before install.

Cons

• Installation feedback is mixed, so buyers should have mechanical experience or access to a shop for proper fitting and adjustment.
• Designed for 5 on 4.5 in bolt pattern and #84 spindles only, so it is not universal for all trailer axles.

Specifications

Application	3500 lb trailer axles
Spindle type	#84 trailer axle spindle
Spindle largest diameter	1.75 in
Spindle overall length	8.25 in
Bolt pattern	5 on 4.5 in
Spindle capacity	1750 lb per wheel
Included bearings and seals	L68149 inner, L44649 outer, 1.719 in I.D x 2.565 in O.D grease seals

Our Verdict

The Trailer Idler Hub Kits 5 on 4.5 in for 3500 lb axles are a practical, value-minded option for anyone rebuilding wheel ends on common 3500 lb trailers. They include the essential spindles, hubs, bearings and hardware needed for a complete service and use durable alloy steel construction. Buyers should be comfortable with mechanical installation or have access to professional help, but for the price these kits represent good value compared with larger repairs.

Frequently Asked Questions

Do these kits include bearings and seals?
Yes, each kit includes L68149 inner cone bearings, L44649 outer cone bearings and 1.719 in I.D x 2.565 in O.D grease seals.

What bolt pattern and spindle size do they fit?
The hubs use a 5 on 4.5 in bolt pattern and the package includes #84 spindles designed for a 1.75 in largest diameter.

Is hardware included to install the hubs?
Yes, the kit supplies cotter pins, spindle nuts, spindle washers, EZ Lube grease caps with rubber plugs and cone wheel nuts with 1/2-20 threads.