EZ Loader 1/2" Lug Bolt 290-031573

EZ Loader 1/2" Lug Bolt 290-031573

Wheel Hub Fastener

The EZ Loader 1/2" Lug Bolt 290-031573 is a replacement wheel fastener used on select EZ Loader boat trailer hubs. This lug bolt threads directly into the tapped hub and secures the trailer wheel against the hub flange.

This part is different from a lug nut or a press-in wheel stud. A lug bolt has a threaded shank with an integrated hex head. It is commonly used on many EZ Loader 5-lug hub setups, including compatible oil bath and grease-style hub assemblies.

Built from zinc-plated steel, this fastener is designed for trailer wheel service in freshwater, saltwater, and road-use environments. Replacing worn, corroded, rounded, missing, or damaged lug bolts helps keep the wheel properly secured to the trailer hub.

Key Features

• Replacement 1/2" lug bolt for compatible EZ Loader boat trailer hubs
• 1/2"-20 UNF fine-thread design
• 13/16" hex head for standard lug wrench or socket use
• Zinc-plated steel finish for marine trailer environments
• Threads directly into compatible tapped trailer hub assemblies

Common Search Names for This Part

This part may also be referred to as a lug stud, wheel bolt, bolt lug, trailer lug bolt, or lugbolt. On this EZ Loader application, the correct description is a 1/2"-20 lug bolt because it threads directly into the hub instead of using a separate lug nut on a pressed-in stud.

Typical EZ Loader Trailer Applications

Commonly used on select EZ Loader boat trailer hubs with 5-lug wheel patterns that use threaded hub holes. These hubs may be part of either oil bath or grease-packed bearing systems, depending on trailer model and year.

Because EZ Loader trailers were built with different hub styles over the years, confirm your existing fastener style before ordering.

Installation Considerations

• Verify the existing lug bolt thread size before installation.
• Inspect the hub threads for corrosion, cross-threading, or damage before installing a new bolt.
• Start the lug bolt by hand to avoid damaging the tapped hub threads.
• Use the proper 13/16" socket or lug wrench to avoid rounding the hex head.
• Torque wheel fasteners to the proper specification for your hub, wheel, and trailer setup.

Fitment Guidance

This is not a universal wheel fastener for every boat trailer.

• Confirm whether your hub uses lug bolts or press-in studs with lug nuts.
• Confirm the thread size is 1/2"-20.
• Check the existing hub, wheel, and bolt style before ordering.

Questions or Need Help Matching Parts?

We’re based in Hardeeville, South Carolina, serving customers nationwide.

📞 Call us — we answer the phone and help you get it right.
📧 Send photos if needed — often the fastest way to confirm fitment.

We focus on matching parts correctly the first time.

Real-World Insight

Lug bolts often get damaged from corrosion, over-tightening, cross-threading, or using the wrong socket. If the bolt head is rounded, the threads are stretched, or the bolt does not start cleanly by hand, replacement is the safer choice. A damaged lug bolt can also indicate that the hub threads should be inspected before the wheel is reinstalled.

What to Have Ready When You Call

• Trailer year, make, and model
• VIN, if available
• Hub type: oil bath or grease
• Current lug bolt size and thread pitch
• Photos of the hub, wheel, and existing lug bolt