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There are 3 basic types of springs for boat trailers.  These are: Double Eye, Single Eye, and Hook or Open Eye.
The following is some guidance on how to measure each type of spring.

Double Eye spring measurement: Measured from Center of Hole (Eye) to Center of hole.

SPRING KIT 25-1/4" 4LF DE 2x2 AXLE PJ1450KIT

Single Eye or Slipper Spring: Measured form Center of Hole (Eye) to Center of tip where Frame of trailer would rest.
SGL Eye Spring List

Open Eye Spring: Measured from Center of Eye to center of Hook.
Open Eye Spring List

There are 1 leaf 2, 3, 4, 5, 6, leaf springs. When measuring to replace springs, it is best to measure where they mount hole-to-hole as the old spring tend to have flattened out and are longer that they were when new.
The most common springs are 20″ double eye, 25-1/4″ double eye, 24″ single eye, 26″ single eye.

  • Leaf spring acts as part of your trailer’s suspension system
  • Provides attachment point for your trailer’s axle
  • Multiple leaves allow flexibility to absorb road shock
  • Allows for a smooth ride
  • Reduces wear and tear on the trailer
  • Ensures level ride on bumpy and uneven surfaces
  • Sturdy steel construction
  • Nylon bushing included on all springs

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