How to Measure Trailer Leaf Springs 

We have the ability to modify and repair existing springs by adding or removing leaves and adding or removing arch. Unfortunately, we do not have a furnace for rolling spring eyes and we do not produce full custom packs.

The size of the eye will refer to the bushing inner diameter. New springs will include new bushings. Trailer spring specs are standardised so there may not be a higher arch option available in the lengths that you need but feel free to send us an email or give us a call with your spring measurements and we will be glad to take a look.

1200 pound springs. You will need a hoist or crane to lift the springs into position. Darn heavy!

A slipper spring is only connected to the trailer by a bolt at the end with the eye. The other end slides in the hanger as the spring changes length. The center bolt of the spring is used to center it in the axle so it is important to match existing spring length to ensure a replacement spring does not move the axle location.

The shortest double eye spring with the weight capacity you are looking for is an MTS-168. This is a 20.31" 3 leaf spring with a 700 lb capacity. www.truckspring.com/trailer-parts/trailer-suspension/trailer-springs/double-eye-mts-168.aspx

@@Truckspring That might acctually work for what im doing. Its for a homemade soil screener. Thanks

The weight that each leaf can support will differ depending on the thickness of the leaf. Steel thickness is given for each of our trailer springs and this represents the thickness of each leaf in inches, e.g., .360 Inches. A thicker leaf will support more weight and the leaf composition will change depending on the part number.

That said is a double eye and with the length of the arch skewed from being flattened it would put all other length measurements out.. the part the rear bolts to is not totally at a 90 but is not straight up and down either. Should measurement be based on the length when that piece is straight up and down? So when load is applied it will move it back at an angle with the give of the leafs. Part im talking about is the rear shackle that has 2 eyes and one side bolts to the axle and other to the leafs, the front side of the leafs bolt directly to a welded eye on the axle, the rear shackle is a separate piece that can move with suspension.. but the leafs are damn near about to over extend and go the other way how wavy and flat they are.. maybe theyre under rated as that rear shackle wouldnt stop any over extension like i would think it would be used for... really dont wanna have to go through it like fitting a new pully belt and buy a bunch of different sizes.. is a lighter duty single axle deal .. thinking of welding a coil pack on it and be done with it but rather put new u bolts n leafs..

Arch measurements can be used as a point of reference when comparing new springs but it will not be possible to get an accurate arch measurement from a worn out spring. It will be more important to order replacement springs of the correct lengths and capacities to make sure that the axle is not moved and clearance around the tire in the fender is adequate.

If leaves are broken on one spring the other spring on the same axle can be used to measure for a replacement. If both springs on the same axle are broken, using what is left of the springs and the measurements between hangers can lead you to the correct spring length. After that it is just deciding on the needed capacity for the trailer and cargo.