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spring types used on boat trailers

Trailer Springs: There are 3 basic types of springs used on 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 Trailer Spring Measurement

Double Eye Springs (DE) are measured eye to eye

Single Eye Trailer Spring Measurement

Single Eye Springs (SE) are measured eye to end

Open Eye Trailer Spring Measurement

Open Eye or Hook Springs are measured Eye to Center of Hook

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.