Eye-to-eye spring
Replace the broken steel plate springs on the trailer with new springs. Trailers have multiple uses, with springs of varying shapes and sizes underneath, and their load-bearing capacity matches that of the axles and towed objects. Order a spring of the same size and capacity as the one to be replaced. Pay attention to your spring style, eyes, or slippers. The end of the slider can be a radial end, a hook-shaped end, or a flat end. Measure the length, width, and height, count the leaves, and then find your spring on the chart. Remove the 9/16 "shackle bolt from the eyelet.
| Part# |
Number |
Width |
Thickness |
Capacity(Pairs) |
Length |
| AS-2 |
2 |
13/4" |
.250" |
1060 |
26" |
| 72-16 |
3 |
13/4" |
.250" |
1400 |
205/16." |
| AS-3 |
3 |
13/4" |
.250" |
1600 |
26" |
| 24923 |
3 |
13/4" |
.250" |
2000 |
231/2" |
| AS-4 |
4 |
13/4" |
.313" |
2120 |
26" |
| PR-722 |
3 |
13/4" |
.250" |
2500 |
251/4" |
| T30-262-5L |
5 |
13/4" |
.313" |
2500 |
273/4" |
| AWS-3 |
3 |
13/4" |
.250" |
3000 |
26" |
| PR-4B |
4 |
13/4" |
.375" |
3500 |
251/4" |
| 72-09 |
3 |
13/4" |
.313" |
3500 |
231/8" |
| AWS-4 |
4 |
13/4" |
.375" |
4000 |
26" |
| SW-4 |
4 |
13/4" |
.375" |
5000 |
251/4" |
| PR-5 |
5 |
13/4" |
.375" |
5800 |
251/4" |
| SW-6 |
6 |
13/4" |
.375" |
7000 |
251/4" |
How to visualize steel plate springs
One method of identifying leaf springs is to use the O.E.M. part number. O. The E.M. or stamping number is located in each area of the leaf spring. You can quickly search for OEM part numbers and SRI numbers by entering the part number in the search box at the top of this page.
Full cone spring
The most common stamping number for fully tapered springs is at the end of the first blade. Other positions include the fixture's side, bottom, or top, or back of the packaging.
Multi-plate spring
The stamping number of multiple springs is most common on the fixture's side, top, or bottom. They may also appear at the bottom of the last leaf next to the central bolt or at the end of the shortest leaf.
Trailer leaf spring
The stamped number of the trailer leaf spring is located on the outside of the hook.
In many cases, the stamping number may only contain a portion of the O.E.M. part number. Ford usually only stamps the prefix and suffixes. You must add a base to complete the part number. For example, F3HT5310JA, D7HT5560AUA, or D1TA5588AA, where 5310 represents the front spring position, 5560 represents the rear position, and 5588 represents the auxiliary spring.
Measure the trailer steel plate spring.
Accurately measuring trailer springs and selecting the correct replacement parts are crucial for the trailer's functionality, making replacement work easier. Using a replacement trailer spring with the proper length will keep the axle in the same position, eliminating the need to move fenders or suspension components such as spring hangers or equalizer hangers. Matching your load capacity, Camber angle, and a number of blades will keep the trailer's driving height and driving characteristics unchanged. Making correct measurements and checking existing trailer springs will enable your trailer to resume driving quickly and reduce inconvenience.
Measure the length of the trailer leaf spring
Measure the trailer steel plate spring
Measure the length of the trailer leaf spring. If you want to replace the spring, it is essential to obtain the same size. To measure the free length, refer to the letter "C" above. It is very important to unload the trailer when measuring the length. When determining the size (C), measure the distance from the center of one spring hole to the center of another double-hole trailer spring hole. The measured values will vary based on the service life and fatigue level of the spring. We offer a wide variety of trailer springs. Firstly, determining the length will significantly narrow your selection range and help you find the correct spring faster.
Determine the capacity of the spring.
Measure the trailer steel plate spring.
Determine the rated value of the trailer axle and then select the capacity of the spring. If you have a trailer axle with a rated weight of 6000 pounds and two springs, you will use two trailer springs with a rated weight of 3000 pounds or more. Please note that the nameplate capacity shown applies to each trailer spring.
After determining the springs' capacity and quantity, calculate the steel plate number for the current spring. If all springs need to be replaced, the number of blades is less critical. If you are willing, you can switch from 4 trailer springs to 3 trailer springs made of thicker steel.
Measure the free opening and curvature of the trailer spring.
Measure the free opening (H) and curvature (A) and (B) of the trailer spring. These measured values are more for reference and will vary with the aging and fatigue of the spring. These measurements can show you the importance of replacing all springs rather than replacing one spring at a time. If the old spring loses its curvature over time and a new spring with higher curvature is added to the other side of the trailer, it will tilt to one side, resulting in uneven and unsafe loading.
Audited Supplier 
Full cone spring
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