About Leaf Spring
Leaf spring series
•Eye to eye
•Slipper spring- flat end
•Slipper spring- hook end
•Slipper spring- open eye
•Slipper spring- radius end
Install Structure
Overslung and Underslung
•Overslung leaf springs sit on top of the axle.
They are "Over" the axle, that will increase ground clearance.
•Underslung mounting has the leaf springs attach below the axle.
That will falling ground clearance, used for some lowboy trailers.
How To Choose Correct Leaf Springs
•Part number could exchange each other from different brands
•Supply load capacity, spring series and install structure
| No. of Leaves |
Width |
Steel Thick |
Free Length |
Free Open |
Eye I.D. |
Capacity Per Spring, lb |
Weight, lb |
Reference No. |
| 2 |
1.75" |
0.197" |
22.75" |
3.81" |
7/8" |
300 |
4.35 |
UNA-033 |
| 2 |
1.75" |
0.259" |
26.00" |
4.13" |
11/16" |
500 |
6.62 |
UNA-121 |
| 3 |
1.75" |
0.237" |
26.00" |
4.12" |
11/16" |
690 |
7.32 |
UNA-122 |
| 3 |
1.75" |
0.360" |
23.13" |
3.50" |
11/16" |
1750 |
10.64 |
UNA-216 |
| 4 |
1.75" |
0.360" |
26.00 |
4.25" |
11/16" |
2000 |
14.13 |
UNA-051 |
| 5 |
1.75" |
0.360" |
26.00 |
4.25" |
11/16" |
2500 |
16.49" |
UNA-052 |
| 6 |
1.75" |
0.360" |
26.00 |
4.25" |
11/16" |
3000 |
19.64" |
UNA-053 |
| 7 |
1.75" |
0.360" |
26.00 |
4.25" |
11/16" |
3500 |
25" |
UNA-054 |
| 8 |
1.75" |
0.360" |
26.00 |
4.25" |
11/16" |
4000 |
27.9" |
UNA-055 |
| No. of Leaves |
Width |
Steel Thick |
Free Length |
Free Open |
Eye I.D. |
Capacity Per Spring, lb |
Weight, lb |
Reference No. |
| 1 |
1.75" |
0.262" |
24.00" |
4.38" |
9/16" |
300 |
4.31 |
UNA-018 |
| 2 |
1.75" |
0.237" |
19.00" |
4.62" |
11/16" |
600 |
4.47 |
UNA-193 |
| 3 |
1.75" |
0.262" |
24.50" |
4.00" |
7/8" |
850 |
7.65 |
UNA-267 |
| 3 |
1.75" |
0.360" |
25.00" |
3.50" |
11/16" |
1720 |
10.49 |
UNA-206 |
| 4 |
1.75" |
0.237" |
24.50" |
4.00" |
7/8" |
1000 |
9.08 |
UNA-043 |
| 4 |
1.75" |
0.360" |
25.00" |
3.50" |
11/16" |
2300 |
13.14 |
UNA-208 |
| 5 |
1.75" |
0.323" |
25.00" |
3.50" |
11/16" |
2300 |
14.10 |
UNA-207 |
| 5 |
1.75" |
0.360" |
30.00" |
4.88" |
7/8" |
2293 |
17.45" |
UNA-040N |
| 6 |
1.75" |
0.360" |
30.00" |
4.88" |
7/8" |
3000 |
21.92" |
UNA-057 |
| 6 |
1.75" |
0.237" |
25.13" |
5.00" |
7/8" |
1415 |
13.30 |
UNA-017 |
| No. of Leaves |
Width |
Steel Thick |
Free Length |
Free Open |
Eye I.D. |
Capacity Per Spring, lb |
Weight, lb |
Reference No. |
| 1 |
1.75" |
0.237" |
24.62" |
4.00" |
11/16" |
230 |
3.88" |
UNA-176 |
| 2 |
1.75" |
0.262" |
21.13" |
4.50" |
11/16" |
590 |
5.50" |
UNA-080 |
| 3 |
1.75" |
0.323" |
20.75" |
3.25" |
7/8" |
1000 |
8.35" |
UNA-026 |
| 4 |
1.75" |
0.291" |
32.00" |
4.25" |
11/16" |
1100 |
12.18" |
UNA-024 |
| 5 |
1.75" |
0.237" |
24.62" |
4.00" |
11/16" |
1240 |
10.32 |
UNA-180 |
| 5 |
3.00" |
0.401" |
30.50" |
3.94" |
1.96" |
5000 |
39.30 |
UNA-268 |
| 6 |
1.75" |
0.291" |
32.00" |
4.25" |
11/16 |
1400 |
18.13 |
UNA-029N |
| 6 |
3.00" |
0.401" |
30.50" |
3.94" |
1.96" |
6000 |
46.45" |
UNA-269 |
| 7 |
3.00" |
0.401" |
30.50" |
4.00" |
1.96" |
7500 |
54.00 |
UNA-270 |
| No. of Leaves |
Width |
Steel Thick |
Free Length |
Free Open |
Eye I.D. |
Capacity Per Spring, lb |
Weight, lb |
Reference No. |
| 3 |
1.75" |
0.237" |
24.74" |
4.00" |
11/16" |
800 |
7.15" |
UNA-009 |
| 4 |
1.75" |
0.291" |
26.63" |
3.19" |
11/16 |
1500 |
13.93" |
UNA-229 |
| 4 |
1.75" |
0.360" |
26.63" |
3.06" |
11/16 |
2500 |
17.22 |
UNA-231 |
| 5 |
2.00" |
0.360" |
26.63" |
3.19" |
11/16 |
3500 |
19.99 |
UNA-232 |
| 5 |
2.00" |
0.360" |
26.63" |
3.19" |
1.28 |
3500 |
20.64 |
UNA-299 |
| 6 |
2.00" |
0.401" |
29.50" |
3.50" |
11/16 |
4000 |
27.90 |
UNA-161 |
| 7 |
2.00" |
0.360" |
26.63" |
3.19" |
11/16 |
4000 |
26.57 |
UNA-233 |
| 7 |
2.00" |
0.360" |
26.63" |
3.00" |
1.28 |
4000 |
26.57 |
UNA-233 |
Audited Supplier 
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