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How To Measure Your Spring

  • Match the existing spring according to its shape and type (double eye, slipper-open eye end, slipper-hook end, slipper-flat end, or slipper-radius end), Length and Width.
  • Count the number of leaves, each layer of spring metal is considered a leaf.
  • Measure the length of the spring when the spring is not under load (jack up trailer by the frame), this is the free length of the spring.
  • Measure from the center of the front bushing in a straight line to the center of the rear bushing for DOUBLE-EYE and OPEN-EYE leaf springs.
  • Measure from the center of front bushing in a straight line to the end of spring for HOOK-END, FLAT-END and RADIUS END leaf springs.
  • The inside diameter of the bushing in the attaching eye of the spring needs to match the shackle bolts and spring hanger holes used to mount spring.
  • An inside diameter of 9/16" is the most common size, but some older trailers used 1/2" bushings/bolts.
  • Every leaf spring we sell is supplied with a 9/16" ID bushing in the closed eye
  • Also note that spring capacity is given per each spring-thus a 4,000 lb. rated axle should be matched with two 2,000 lb. or higher capacity springs.
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Springs & u-bolt kit for 3.5K Axle

SPRING AND U-BOLT KIT FOR 3.5K AXLE

Was: $89.00
Now: $63.45

SW-5 EYE TO EYE SPRING KIT FOR 5.2K AND 6K AXLES. SPRING MEASURES 25.25" FROM EYE TO EYE.

Was: $109.95
Now: $75.95
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