EZ Loader 4" Delrin Structural Washer (Crossmember Mount) | 290-017329

OEM EZ Loader 4" Delrin washer designed for structural connection points on galvanized boat trailers—used where crossmembers attach to the main frame (“boom”).

This is not a standard washer. It is a large-format structural isolation washer used to manage friction, protect surfaces, and maintain long-term integrity at key frame connection points.

• Used at crossmember-to-frame connections
• Isolates metal-to-metal contact
• Distributes load across a wider surface
• Protects galvanized coatings from wear

👉 Not sure if this is the correct washer? Call us—we’ll help you match it properly.

Part Name: 4" Delrin Structural Washer
Part Number: 290-017329

What This Washer Does

At crossmember-to-frame connections, trailer structures experience load transfer, vibration, and slight movement during towing and launching. This washer is installed between those components to:

• Isolate metal-to-metal contact
• Distribute load across a wider surface
• Allow controlled movement without binding
• Protect galvanized coatings from wear

Material: Delrin (Why It’s Used)

Made from Delrin (acetal)—a high-performance engineered plastic, not nylon.

• Very low friction (self-lubricating)
• High strength and rigidity
• Excellent wear resistance
• Dimensional stability (does not absorb moisture)

Why Not Metal Washers

• Create metal-to-metal contact
• Wear through protective coatings
• Increase friction and binding
• Lead to corrosion over time

Delrin acts as a protective interface between components.

Designed for Galvanized Trailers

Used on EZ Loader galvanized trailers at crossmember mounting points where protection and controlled movement are critical.
👉 Structural application—not general hardware use.

Fitment Clarification

• For large structural connection points
• Not for bracket mounting
• Not for light-duty hardware
• Not a general-purpose washer

Smaller Delrin Washer Option

For smaller mounting applications:

👉 1.38" Delrin Washer (290-023061)

• Bolt-level surface protection
• Bracket mounting points
• Aluminum and galvanized trailers

290-017329 = structural interface washer
290-023061 = hardware protection washer

Why This Part Matters

👉 Protects critical structural connection points.

• Prevents metal wear
• Protects coatings
• Reduces corrosion risk
• Eliminates noise and binding

Real-World Insight

At 411-Trailers Group in Hardeeville, SC, customers regularly visit to compare parts and understand real-world function. Images reflect actual inventory from our location.

Final Note

👉 This is not just a washer—it is part of the structural design of the trailer.
Correct size and application ensure proper fitment, protection, and long-term performance.