How to Determine if Slipper Spring SP-177275 Will Fit Trailer

Question

Question:

Slipper spring, Item # SP-177275. Will this fit a Harbor Freight 4 foot x 8 foot folding trailer? The current springs are about 22-1/2 inch long and 20-1/2 inch between the mounting bolts. Thanks.

asked by: Brian O

0

Expert Reply:

I can tell you how to determine if the 2-Leaf Slipper Spring for 1,000-lb Trailer Axles # SP-177275 will fit your trailer, though we do not have information regarding fits for individual trailers.

The best way to determine if a slipper spring will fit is by measuring the length from the center of the spring eye to the end end of the spring, as you can see in the accompanying diagram. The best way to get an accurate length of a leaf spring is with the trailer up on jacks with the axle hanging. You will also need to know the width of the spring you need and the weight rating of your axle.

Slipper Spring # SP-177275 measures 24-5/8" from the center eye to the end of the spring so it is likely going to be too long for your trailer, though this is the shortest spring we offer.

The best we an offer is for you to convert to a double eye spring such as 3-Leaf Double-Eye Spring for 2,000-lb Trailer Axles - 23-1/2" Long # SP-113275 for which you'd also need a Hanger Kit such as the Single-Axle Trailer Hanger Kit for Double-Eye Springs - 1-1/2" Front, 1-1/4" Rear # APS2 or 3-1/4" Front, 1-1/4" Rear # APS4.

I have added links to our entire selection of double eye and slipper springs, as well as links to help articles on slipper spring and double eye spring suspension which I highly recommend checking out.

expert reply by: Kyle S

0

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Jim J.

7/13/2020

I have a two leaf slipper spring that is 26and3/4“ long and 1and 3/4“ wide. Do you have a spring for me?

Reply

Chris R.

7/17/2020

The closest option we have available is the 4-Leaf # SP-264275. This 1-3/4" wide slipper spring has a 26-1/4" length and is designed for 4,300 pound axles. It's pretty normal for older springs to stretch out a bit over time so the shorter length might actually be correct for your trailer, assuming the axle rating also matches.

Reply

Jim J.

7/23/2020

@ChrisR how would I determine my axle rating?

Reply

Jim J.

7/23/2020

@ChrisR Is there a flat end receiver that is capable of being bolted onto my trailer versus being welded on. I could then move that attachment forward to accommodate the shorter 2 leaf spring you have available. Call me if you like, 715-834-0365 or 715-577-5055.

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See All (4) Replies to Jim J. ∨

Answer 1

For a single axle trailer, you want the shackle strap to be able to move so that you have the spring deflection needed for your suspension. Angled like the photo or even almost vertical is fine you just don't want the shackle strap to bind and…

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Answer 2

In most cases switching from double eye to slipper spring requires new hangers and mounting hardware. This would require you to cut the old spring hangers off the trailer and mount the new hangers in the correct location for the slipper springs. Due…

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Answer 3

We offer a 1000 lb spring (2000 lbs/axle) spring as part #SP-179275 which has the same 24-5/8 inch length as the #SP-177275 spring you've already purchased, so the spring would be a perfect fit without needing to move any of the spring hangers.…

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Answer 4

The hole diameters for the Demco Channel Tongue Trailer Coupler item #12564 are 1/2 inch. It is recommended to use grade 8 hardware to attach the coupler to your trailer frame. You can find these bolts at a local hardware store as they do not come…

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Answer 5

The shackle straps need to be placed on the outside of the rear leaf spring hangers which you can see in the attached photo. Furthermore, the distance between the two mounting plates (inside to inside) on your leaf spring hangers should be…

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Answer 6

For double eye leaf springs, I recommend going with the 4-Leaf Double-Eye Spring #SP210275. This spring is 25-1/8 inches long x 1-3/4 inches wide and designed for 3,500 pound axles. These springs are a common length for 3,500 pound trailers. One…

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Answer 7

When choosing between the Single-Axle Trailer Hanger Kit for Double-Eye Springs part #APS1, part #APS2, and part #APS3 it will be best to use the one that has measurements that most closely resemble what is already on your trailer. For example, if…

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Answer 8

If you're referring to the bolts that attach the shackles in your suspension system to your #APS4 hangers, you won't need to torque them to a specific rating since over tightening those bolts would squeeze the shackles against the leaf…

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Answer 9

In order to determine the torque rating for the lug nuts on your trailer you will need to know check out the chart I attached that shows all of the torque specs for all the trailer lugs available based on stud size, wheel material and wheel size.

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Answer 10

To find the load capacity for your axle you should look on the trailer VIN plate or sticker that lists the VIN number. The weight rating of the axle should be listed on that same plate or sticker. Also, the axle could have a tag or plate on it that…

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Answer 11

The difference between the Class II and Class III hitches has to do with their Gross Trailer Weight (GTW), their Tongue Weight (TW), and their Hitch Receiver Size. Class II trailer hitch receivers have a 1-1/4 inch receiver and can be rated up to…

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Answer 12

Thank you for providing the specs for the suspension components that you already have. Correct hanger spacing really depends on the components being used such as springs, hangers and equalizers. Most of the hanger spacing dimensions that we have are…

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