How To Select Replacement Trailer Leaf Springs
How to select the correct replacement leaf
spring for your trailer
Buying replacement parts for your trailer isn’t always the easiest thing to do.
More often than not, you don’t know what to call a particular part and you
certainly don’t know which type or size you need. Our goal is to make buying
replacement parts easier for our customers. In this article, we are going to
tackle how to select the correct replacement leaf spring for your trailer.
First things first, you need to determine which type of leaf spring you need.
There are 5 different types of leaf springs that fall under two main categories
– double eye leaf springs and slipper springs.
Notice that all of the springs shown have a bolt “eye” on the front end of the
spring. That is how the spring attaches to the trailer frame. The other end of
the leaf spring is more interesting. Notice that all of the springs are arched.
When your trailer is loaded and you are driving along, the spring moves up and
down vertically as your tires hit bumps and variations in the road. This up and
down movement “flattens” out the spring causing it to grow in length. The spring
is attached in a fixed position on the front end, so the back end moves back and
forth. The slipper springs slide (or slip) back and forth against a stationary
surface to easily compensate for the changes in length. The stationary surface
can be a specific bracket attached to the trailer frame, or sometimes the
trailer frame itself is used as the contact surface of a slipper spring. Here is
an example of a slipper spring attachment on the moveable back end:
Double Eye leaf springs get their name because they have a bolt eye on both the
front and back of the spring. This type of spring deals with the changing length
by adding pivoting shackle links to the rear of the spring. Here is an example:
Now that you know the different types of leaf springs, you can select the
appropriate style and move on to measuring for the correct replacement. The
number of leaves and the weight capacity of the spring is also very helpful to
know.
Here are some terms that are important to know regarding leaf spring
measurements:
Overall Length – The complete overall length from one end to the other
Length – Depending on the type of spring the length is determined slightly
differently. Double eye leaf springs are measured from center of eye to center
of eye. Open eye slipper springs are measured from center of eye to center of
open eye. The remaining types of slipper springs (flat end, radius end & hook
down) are measured from center of eye to contact point. (See below for the 3
different length measurement diagrams)
Axle Location – The axle location is measured from center of eye straight across
to the point where the leaves are all bolted together.
Stack Height – The thickness of the springs where all leaves are stacked.
Width – The width of the leaf spring.
Use the charts below to find the correct leaf spring for your trailer. Just
click on the part number and you will be taken directly to that leaf spring on
our online trailer parts store.
Double Eye Leaf Springs
Part #
Leaves
Capacity
Overall
Length
Length
Width
Stack
Height
Axle
Location
FRA-1726
5
2500
27.25”
26”
1.75”
1.75”
13”
TDE-81199
4
2500
26.75”
25.25”
1.75”
1.50”
12.5”
UGC-UNA-111
5
3000
27”
25.25”
1.75”
2.01”
13”
UGC-UNA-167
4
1400
22”
20.5”
1.75”
1.13”
10.5”
UGC-UNA-168
3
700
21.75
20.25”
1.75”
0.67”
10.5”
UGC-UNA-169
3
1000
21.5”
20.25”
1.75”
0.79”
10.5”
UGC-UNA-210
4
2100
28.5”
27”
1.75”
1.38”
13.5”
UGC-UNA-212
4
1750
26.5”
25.25”
1.75”
1.27”
13”
UGC-UNA-216
3
1750
24.5”
23.25”
1.75”
1.08”
12”
UGC-UNA-217
3
1500
26.75”
25.25”
1.75”
1.04”
13”
UGC-UNA-219
3
1250
26.5”
25.25”
1.75”
0.94”
13”
UGC-UNA-220
3
2000
26.75”
25.25”
1.75”
1.16”
13”
UGC-UNA-221
4
3000
26.75”
25.25”
1.75”
1.5”
13”
UGC-UNA-223
6
3500
26.5”
25”
1.75”
2.05”
13”
Flat End Slipper Leaf Springs
Part #
Leaves
Capacity
Overall
Length
Length
Width
Stack
Height
Axle
Location
DEX-072-010-01
6
4500
30”
28”
1.75”
2.52”
14.50”
TDE-81197
2
1000
30”
28”
1.75”
0.69”
13.5”
TDE-81198
4
1850
30”
28”
1.75”
1.44”
13.5”
UGC-UNA-039
3
1400
30”
29”
1.75”
1”
13.5”
Radius End Slipper Leaf Springs
Part #
Leaves
Capacity
Overall
Length
Length
Width
Stack
Height
Axle
Location
DEX-072-021-00
5
5000
30”
29”
2.50”
2.14”
12”
TDE-81194
2
500
24 5/8”
23.5”
1.75”
0.44”
11”
TDE-81196
4
1000
24 5/8”
23.5”
1.75”
1”
11”
UGC-UNA-178
3
750
25”
23”
1.75”
0.63”
11”
UGC-UNA-179
4
950
25”
22”
1.75”
0.88”
11”
UGC-UNA-180
5
1250
25”
22”
1.75”
1.13”
11”
Open Eye Slipper Leaf Springs
Part #
Leaves
Capacity
Overall
Length
Length
Width
Stack
Height
Axle
Location
FRA-1701
3
825
23.75”
22”
1.75”
0.75”
11”
FRA-1706
6
3300
28.25”
26.5”
1.75”
2.13”
13”
FRA-1707
4
1400
25.5”
24”
1.75”
1.13”
12”
UGC-UNA-263
3
1750
28”
26.5”
1.75”
1”
13”
UGC-UNA-264
4
2350
28”
26.5”
1.75”
2.38”
13”
Hook Down Slipper Leaf Springs
Part #
Leaves
Capacity
Overall
Length
Length
Width
Stack
Height
Axle
Location
TRP-SH-7230
4
2000
31.25”
26.5”
2”
1.25”
14”
TRP-SH7232
5
3500
27.5”
25”
2”
1.25”
11.50”
UGC-UNA-231
4
2500
27.5”
25”
2”
1.44”
11.50”
UGC-UNA-232
5
3500
26.5”
24”
2”
1.80”
11.50”
UGC-UNA-285
7
4000
28”
25”
2”
2.52”
11.50”