1/2"-20 Lug Nut Zinc Plated 60° Seat 290-031564

5 & 6-Lug Wheel Fastener

The 1/2"-20 Lug Nut Zinc Plated 60° Seat 290-031564 is a replacement wheel fastener used on compatible EZ Loader boat trailer hubs. This lug nut is designed for 1/2"-20 fine-thread wheel studs and uses a 60° tapered seat for compatible trailer wheels.

This part is commonly used on compatible EZ Loader 5-lug and 6-lug hub applications. It uses a 13/16" hex head socket and helps secure the trailer wheel to the hub when matched with the correct wheel stud, wheel seat, and hub assembly.

The zinc-plated finish helps provide corrosion resistance for marine trailer use. Because boat trailers deal with road spray, freshwater, saltwater, ramp use, and vibration, replacing worn, rounded, corroded, missing, or questionable lug nuts is important during wheel and hub service.

EZ Loader Lug Nut Features

• Replacement 1/2"-20 lug nut for compatible EZ Loader trailer hubs
• Used on compatible 5-lug and 6-lug hub applications
• 60° tapered seat for compatible trailer wheels
• 13/16" hex head socket size
• Grade 5 zinc-plated steel construction
• Useful for replacing rusted, rounded, worn, or missing lug nuts

Typical EZ Loader Trailer Applications

This lug nut is commonly used on compatible EZ Loader boat trailer hubs with 1/2"-20 wheel studs. It may be used on select 5-lug and 6-lug hub assemblies depending on the hub, wheel, and trailer setup.

Because EZ Loader trailers use different hub and wheel-fastener styles by model, axle rating, and production year, compare your existing lug nut, wheel stud, and wheel seat before ordering.

Important Difference: Lug Nut vs. Locknut vs. Spindle Nut

This part is a 1/2"-20 trailer lug nut. It is used to secure the trailer wheel to compatible wheel studs.

It is not the same as a 1/2"-13 coarse-thread trailer locknut used on brackets or U-bolts, and it is not a spindle nut used to retain the hub on the axle spindle. Using the wrong nut can damage threads, prevent proper clamping, or create a wheel-end safety issue.

Installation Considerations

• Confirm the wheel stud thread size is 1/2"-20 fine thread.
• Confirm the wheel uses a compatible 60° tapered seat.
• Use a proper 13/16" socket or lug wrench.
• Start lug nuts by hand to reduce the chance of cross-threading.
• Replace rounded, stretched, cracked, corroded, or questionable lug nuts before towing.
• Torque wheel fasteners to the correct specification for your trailer, hub, and wheel setup.
• Recheck lug nut torque after wheel service or after installing a replacement wheel.

EZ Loader Lug Nut Fitment Guidance

This is not a universal trailer lug nut.

• Confirm your trailer uses 1/2"-20 wheel studs.
• Confirm the wheel seat style is 60° tapered.
• Confirm the lug nut uses the correct hex size for your service tools.
• Confirm whether your trailer has a 5-lug or 6-lug hub setup.
• Use your trailer VIN, old lug nut, wheel stud, and photos when checking fitment.

Real-World Insight

Lug nuts are small parts, but they carry the clamping load that holds the trailer wheel to the hub. A rounded, rusted, cross-threaded, or mismatched lug nut may not tighten correctly. During wheel or hub service, replace questionable lug nuts instead of reusing hardware that may not hold proper torque.

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.

What to Have Ready When You Call

• Trailer year, make, and model
• VIN, if available
• Current lug nut size and thread pitch
• Hub style: 5-lug or 6-lug
• Photos of the wheel, hub, wheel stud, and old lug nut