EZ Loader D-Shaped Spindle Washer (D-Flat) 290-034114

D-shaped spindle washer designed for trailer axles with a flat (D-shaped) spindle surface—used to maintain alignment, prevent rotation, and support proper hub assembly.

Unlike standard round washers, this washer locks onto the spindle flat to prevent spinning under load and ensure proper hardware positioning.

• D-shaped washer for flat spindle surfaces
• Prevents rotation under torque
• Maintains alignment in hub assembly
• Critical for proper spindle hardware fitment

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

Part Name: D-Shaped Spindle Washer (Flat)
Part Number: 290-034114

Fitment Clarification

👉 Not all D-shaped spindle washers are the same.

• multiple sizes exist
• dimensions and spindle fitment vary
• this part must match your spindle size and flat profile

Using the incorrect size can result in improper seating, rotation, or premature wear within the hub assembly.

What Makes This Washer Different

This is not a standard washer.

The flat edge aligns with the spindle flat to:

• prevent rotation
• maintain alignment
• ensure proper hardware seating

Function & Purpose

• prevents washer rotation under torque
• maintains correct positioning of spindle hardware
• supports proper preload and alignment
• acts as a mechanical locking interface

Cross-Compatibility

This washer design is not exclusive to EZ Loader.

Used across multiple trailer manufacturers with similar D-flat spindle designs.

Fitment must always be verified by spindle shape and dimensions—not brand alone.

Specifications

• Style: D-shaped (flat side)
• Material: Steel

Why This Part Matters

👉 Prevents rotation and maintains proper alignment within the hub assembly.

Using a standard round washer or incorrect size can lead to improper seating, hardware movement, and premature wear.

Real-World Insight

At 411-Trailers Group, we work with trailer axle systems regularly. One of the most common issues we see is incorrect spindle hardware being substituted for application-specific components like this washer.

Matching the correct washer to the spindle design is critical for proper assembly and long-term reliability.