5/16" Stainless Steel Lock Washer — 290-002635-S

5/16" Stainless Steel Lock Washer — Part #290-002635-S

OEM EZ Loader replacement fastener commonly used with 5/16" trailer hardware where a corrosion-resistant locking washer is required.

The stainless steel construction makes this washer appropriate for marine trailer environments where exposure to water, road spray, and moisture is common. Lock washers help resist loosening caused by vibration when used with the correct matching bolt, stud, or nut.

This is a small hardware component used in a variety of EZ Loader trailer assemblies. Exact factory usage can vary by trailer model, year, and application, so buyers should confirm the required fastener size before ordering.

Confirm the Correct Size Before Ordering

EZ Loader trailers use several different fastener sizes throughout the frame, suspension, bunk, winch, lighting, and accessory systems. The presence of another stainless fastener nearby does not necessarily mean this 5/16" washer is correct for that location.

When possible, compare the original washer and mating hardware or confirm the required fastener diameter before ordering.

Marine Trailer Hardware

Stainless steel hardware is commonly selected for marine trailer applications because of its corrosion resistance. Correct installation still matters: use the proper matching fastener size and tighten the assembly according to the requirements of the component being secured.

Need Help Identifying an EZ Loader Part?

If you are uncertain whether this washer is correct for your trailer, send us clear photos of the assembly, your EZ Loader VIN tag when available, and a description of the part or repair you are working on. Measurements are especially helpful when identifying small trailer hardware.

Independent EZ Loader Parts Dealer Notice

EZLoaderParts411.com is an EZ Loader OEM replacement parts supplier owned and operated by 411MarineCom, Inc. and the 411Marine family, serving customers since 1998 from Hardeeville, South Carolina.

411MarineCom is a high-volume independent EZ Loader trailer dealer and direct-to-factory source for new EZ Loader marine boat trailers, OEM replacement parts, and fitment support.

We are a dealer resource, not the manufacturer. Our team helps previous trailer customers and new customers identify the correct EZ Loader parts using trailer VIN details, photos, measurements, real trailer comparisons, hands-on parts experience, publicly available resources, our websites, and direct customer conversations whenever possible.