Hub Cap 3434024 Aluminum Hubcaps for Trailer Axle - Pack of 4

In this review the reviewer looks at a budget-friendly set of four aluminum hub caps intended for trailer axle use, noting the clear win is the complete kit and easy fitment for common replacements. The pack contains 4 hub caps with gaskets and plugs plus an extra set of 4 gaskets and plugs, which makes it a practical buy for anyone maintaining multiple hubs or preparing for service. The transparent oil window and robust sealing are highlighted as the primary reasons to consider this kit for routine bearing maintenance and oil-level checks.

Key Features

• Complete kit: Comes with 4 hub caps, 4 gaskets and plugs plus an extra 4 gaskets and plugs so a single purchase covers multiple hubs or a spare set for repairs.
• Exact fit dimensions: Bolt size 5/16 with overall depth 2-5/8 and flange outer diameter 5-1/4 in to match common hub housings and simplify replacement.
• Transparent oil window: Clear oil window allows quick visual checks of lubricant level without disassembly, helping prevent under-lubrication.
• High quality seal: The replacement features a tight sealing surface aimed at keeping dirt and water out to protect wheel bearings and extend service life.
• Compatibility: Designed to replace STEMCO 343-4024 and fit many OEM part cross-references so it is useful for older trailers and mixed fleets.

Who It's For

This kit is best for trailer owners, fleet mechanics, and DIYers who need a straightforward replacement for common hub cap part numbers and value having spare gaskets and plugs on hand. The clear oil window and included extras make it especially useful for regular maintenance schedules on trailers and commercial wheels.

Those requiring an OEM-branded part or an exact match for a niche or uncommon hub should double-check measurements before buying. A few users have reported leakage on some units, so anyone needing a guaranteed leakproof, heavy-duty factory original might prefer a different sourced part.

Pros & Cons

Pros

• Includes extra gaskets and plugs for immediate spares or future service.
• Transparent oil window simplifies oil monitoring and helps prevent bearing failure.
• Solid fit for the listed cross-reference parts and standard bolt sizes, offering good value for money.

Cons

• Some customers reported occasional leakage, so fit and seal quality can vary between units.

Specifications

Contents	4 hub caps with gaskets and plugs, plus 4 extra gaskets and plugs
Bolt Size	5/16
Overall Depth	2-5/8 in
Inside Depth	1-7/8 in
Flange Inner	3-1/2 in
Flange Outer Diameter	5-1/4 in
Compatible With	Replaces STEMCO 343-4024 and cross-references listed OEM part numbers

Our Verdict

The aluminum hub cap pack is a sensible, cost-effective option for trailer owners who need a ready-to-install replacement with spare gaskets and a visible oil window for maintenance. It offers good value and broad compatibility for routine use, though buyers should inspect seals at installation because a minority of users reported leakage issues.

Frequently Asked Questions

Does this kit include spare parts?
Yes. The package contains 4 hub caps with gaskets and plugs plus an extra 4 gaskets and replacement plugs.

Will these fit my trailer hub?
They match bolt size 5/16 and flange outer diameter 5-1/4 in; confirm those dimensions against your hub and the listed cross-reference numbers before purchasing.

Can I check oil level without removal?
Yes. The hub caps include a transparent oil window for quick visual checks of lubricating oil.