Hanger Spacing Dimensions for Installing Double-Eye Leaf Springs on a Trailer

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Question:

how far apart are hanger brackets to be placed - center to center of bolt holes

asked by: ken

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Expert Reply:

The Trailer Leaf Spring, 2250 lbs. 6 Leaf, item # e27SR, is sold as a replacement spring for older trailers and measures 26 inches for eye to eye, center to center. If you are replacing the springs and hangers you will need to use the same center to center dimension as the original mounting brackets. These springs are designed for a 4,500 pound axle.

If you are building a new trailer you will need to determine the weight capacity of the axle you will be using and order springs and hangers accordingly. We have several springs designed to be used for new construction. I will list the part numbers, weight capacities and dimensions below.

Trailer Leaf Spring, 1,750 lbs. 4 Leaf, item # e54SR, is designed for 3,500 pound axles and is used on 99 percent of trailers using 3,500 pound axles. The hangers for the # e54SR springs, are placed 24-7/8" inches apart for a single axle setup

For a tandem axle set up the front to center bracket dimension is 29-1/2 inches and the center to rear hanger dimension is 29-1/2 inches.

Trailer Leaf Spring, 4 Leaf, item # e28SR, is designed for up to 5,000 pound axles, the Trailer Leaf Spring, 5 Leaf, item # e34SR, is designed for up to 6,000 pound axles, and the Trailer Leaf Spring, 6 Leaf, item # e64SR, is designed for 7,000 pound axles. The hanger bracket measurements for all of these springs are the same as the SP-212275 dimensions stated above.

We have a spring hanger kit designed to work with the above mentioned springs. For a single axle trailer use Single Axle Trailer Hanger Kit for 1-3/4 inch Double Eye Springs, item # APS1, and for a tandem axle trailer the Tandem Axle Trailer Hanger Kit for 1-3/4 inch Double Eye Springs, item # APT5.

The number of springs in the spring pack are not directly related to spring capacity or durability, springs should be selected based on the weight capacity of the axle or axles being used. I have included a link to our double-eye spring FAQ article that lists the replacement parts needed.

expert reply by: Robert G

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Answer 1

When changing the size of the equalizer that is on a trailer, this will affect the size of hangers needed or the spacing of the hangers. For example, if you were to go with an equalizer that is one inch taller, you could keep the center hanger the…

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Answer 2

Torque value ranges for lug nuts depend primarily on the diameter of the stud and the material the wheel is made of, 1/2-inch studs and a steel wheel in your case. In this instance a torque range of 90 - 120-ft/lbs is appropriate.

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Answer 3

From that number you supplied, it appears you have axles that are 5,200-lb to 6,000-lb with a 12" - 6 on 5-1/2 bolt pattern. For brake assemblies I recommend #AKEBRK-7R-SA for the right hand side and #AKEBRK-7L-SA for the left. This is a…

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Answer 4

Spring Hanger location dimensions are normally figured by the manufacturer and provided with the spring hanger kit, that includes all of the parts for installing the springs on the trailer frame. I have provided a chart that shows the spring hanger…

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Answer 5

Well shackle length is mainly based on the height difference between the front and rear hangers. The rear hanger normally doesn't hang as low as the front so that the shackle can offset the difference and add the ability to move. What is the…

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Answer 6

Square axles can be tough to determine capacity. Often times the same spindle fits a range of axle capacities. The best way to determine the capacity is to get the inner and outer bearing numbers stamped into the metal of the bearings like you did.…

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Answer 7

I checked with our engineering dept and they said the salt spray rating for our galvanized springs like the #e48SR is 700 hours. That is a huge difference and in my opinion easily makes it worth the extra money over non-coated springs especially for…

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Answer 8

Square axles normally don't have spring seats like a round axle but do have a hole for the leaf spring bolt to fit into. Take a look at the CE SMITH #CE33201GA-HUB for a visual. The U-bolt mounting kits will have a hole in the center for the…

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Answer 9

You can refer to the linked articles on trailer axle spacing and leaf spring suspensions to help you determine where to position your spring hangers on your tandem axle trailer build. Hanger spacing depends on axle placement and axle placement should…

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Answer 10

Hey Sam; thanks for the question and yes it is possible to go from a 3,500 lb torsion axle to a spring leaf axle on your boat trailer. You'll need to have new hangers welded on, as well as get leaf springs and, of course, the axle itself. For the…

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Answer 11

As a general rule of thumb on a single axle trailer the hanger spacing should be around 3/8" shorter than the spring eye to spring eye measurement of your leaf spring. So for a 23-1/8" long leaf spring like the #e59SR you would want your…

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Answer 12

Hi Steve; wet bolts are a great idea for all trailers so I would recommend them for your boat trailer. Instead of piecing something together with the #018-026-05 you were looking at I recommend the MORryde Suspension Upgrade Kit. This comes with wet…

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Hanger Spacing Dimensions for Installing Double-Eye Leaf Springs on a Trailer

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