What is the difference between a double-eye spring and a slipper spring?

Dec 26, 2023 | Spring Axles, Trailer Axles

What is the difference between a double-eye spring and a slipper spring?

Double-eye and slipper springs are two common types of springs used in trailer suspension systems. They have distinct designs and characteristics, each offering advantages and disadvantages. Here are the key differences between double-eye and slipper springs on spring trailer axles:


  • Double-Eye Springs: Double-eye springs have an eye at each end, resembling a figure-eight or “double-eye” shape. These eyes are used for mounting the spring to the trailer frame and axle.
  • Slipper Springs: Slipper springs have a single eye at one end and a flat, tapered end at the other. The tapered end rests directly on a hanger or bracket mounted on the trailer frame.

Attachment Method:

  • Double-Eye Springs: They attach to the trailer’s frame and axle using separate bushings and bolts. This dual-eye design provides more stability and distributes the load evenly.
  • Slipper Springs: They attach directly to the trailer’s frame through the single eye and do not require additional bushings or bolts. The tapered end sits on the hanger or bracket.

Load Distribution:

  • Double-Eye Springs: Double-eye springs distribute the load more evenly across both ends of the spring. This design is often preferred for trailers that require balanced weight distribution.
  • Slipper Springs: Slipper springs tend to concentrate more load on the side with the single eye, which can make them better suited for trailers with a consistent load or where more weight needs to be focused on a particular axle.

Ride Characteristics:

  • Double-Eye Springs: They typically provide a smoother and more controlled ride because the load is evenly distributed. This design is often chosen for trailers where ride comfort is a priority.
  • Slipper Springs: Slipper springs can provide a slightly stiffer ride due to the load concentration on one end. However, this may be advantageous for certain trailer applications where a firmer suspension is desired.

Maintenance and Replacement:

  • Double-Eye Springs: Replacing double-eye springs can be more straightforward since they use separate bushings and bolts. This makes it easier to change individual components if needed.
  • Slipper Springs: Replacing slipper springs can be simpler because they don’t require additional bushings and bolts. However, if a hanger or bracket becomes damaged, it may be more complex to replace.


  • Double-Eye Springs: They may be slightly more expensive due to the need for extra hardware like bushings and bolts.
  • Slipper Springs: Slipper springs can be more cost-effective since they require fewer additional components.

In summary, the choice between double-eye and slipper springs for your trailer axle depends on your specific trailer’s design, intended use, load distribution requirements, and ride preferences. Both types of springs have their merits, and the decision should be based on what best suits your trailer’s needs and your preferences as a trailer owner.


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