
Leaf Spring - Manufacturing process
1.Shearing of flat bar
2.Center hole punching
3.End heating process forming
4.Heat treatment: a. heating; b. camber forming; c. quenching; d. tempering
5.surface preparation: a. shot penning / stress peening; b. painting
6.Eye bush preparation process: a. Eye reaming / eye boring; b. Bush insertion / bush reaming
7.Assemble: a. Presetting & load testing; b. Paint touch-up; c. Marking &packing
5 Leaf Double Eye Spring for 6,000 lb Trailer Axles - 25-1/4" Long
- 1650 lb. capacity per spring for standard 3,500 lb. trailer axle
- Length from center of eye to end of hook: 25.2", spring width: 1.8"
- Eye diameter with bushing: 9/16", eye diameter without bushing: 10/16"
- Leaf thickness: 3/8", number of leaves: 5
Part No. |
Leaves |
Width |
Total Free Length |
Capacity(lbs) per spring |
UNA-216 |
3 |
1.75 |
23.13 |
1750 |
UNA-111 |
5 |
1.75 |
25.25 |
3000 |
UNA-051 |
4 |
1.75 |
26 |
2000 |
UNA-144 |
3 |
1.75 |
27 |
750 |
UNA-210 |
4 |
1.75 |
27 |
1750 |
UNA-223 |
6 |
1.75 |
25.25 |
3380 |
UNA-212 |
4 |
1.75 |
25.13 |
1830 |
UNA-221 |
4 |
1.75 |
25.13 |
3000 |
LEAF SPRING
Leaf spring is one of the most widely used elastic elements in automobile suspension. It is an approximately equal-strength elastic beam composed of several alloy spring sheets of equal width but unequal length (thickness can be equal or unequal).
When the leaf spring is installed in automobile suspension, the vertical load is positive, and each spring sheet is deformed, There is a tendency to arch upward. At this time, the axle and frame are close to each other. When the axle and frame are far away from each other, the positive vertical load and deformation of the leaf spring will gradually decrease, sometimes even reverse. To improve the stress condition of the main roll ear, the end of the second piece is often bent into a roll ear and wrapped outside the main roll ear.
To make it possible for each piece to slide relatively during elastic deformation, The two ends of the leaf spring in some suspensions are not made into rolling ears, but other support connection methods are adopted, such as a rubber support pad.
Double Eye Spring |
Part No. |
Wide*Length(inch) |
Capacity(lbs) |
Arch Height(inch) |
Leaves |
Surface Treatment |
UNA-216 |
1.75*23.13 |
1750 |
3.5 |
3 |
Black/Galvanize/Dacromet |
UNA-212 |
1.75*25.13 |
1830 |
3.25 |
4 |
Black/Galvanize/Dacromet |
UNA-218 |
1.75*25.25 |
2500 |
3 |
4 |
Black/Galvanize/Dacromet |
UNA-223 |
1.75*25.25 |
3380 |
3.5 |
6 |
Black/Galvanize/Dacromet |
UNA-124 |
1.75*26 |
1000 |
4.12 |
4 |
Black/Galvanize/Dacromet |
UNA-210 |
1.75*27 |
1750 |
2.75 |
4 |
Black/Galvanize/Dacromet |
UNA-224 |
1.75*29.75 |
1250 |
4.38 |
3 |
Black/Galvanize/Dacromet |

Slipper Spring with Hook End |
Part No. |
Wide*THK(mm) |
Capacity(Kg) |
Arch Height(inch) |
Leaves |
Surface Treatment |
UNA-315 |
2*26.63 |
3500 |
3.19 |
5 |
Black/Galvanize/Dacromet |
UNA-317 |
2*26.63 |
4000 |
3.19 |
7 |
Black/Galvanize/Dacromet |
UNA-285 |
2*26.63 |
4000 |
3 |
7 |
Black/Galvanize/Dacromet |
Slipper Spring Radius End |
Part No. |
Wide*THK(mm) |
Capacity(Kg) |
Arch Height(inch) |
Leaves |
Surface Treatment |
UNA-026 |
1.75*20.75 |
1000 |
3.25 |
3 |
Black/Galvanize/Dacromet |
UNA-178 |
1.75*24.62 |
750 |
4 |
4 |
Black/Galvanize/Dacromet |
UNA-180 |
1.75*24.62 |
1240 |
4 |
5 |
Black/Galvanize/Dacromet |
UNA-132 |
1.75*27.5 |
1000 |
4.63 |
2 |
Black/Galvanize/Dacromet |
UNA-268 |
3*30.5 |
5000 |
3.94 |
5 |
Black/Galvanize/Dacromet |
UNA-269 |
3*30.5 |
600 0 |
3.94 |
6 |
Black/Galvanize/Dacromet |
UNA-270 |
3*30.5 |
7000 |
4 |
5 |
Black/Galvanize/Dacromet |
Part No. |
Wide*THK (mm) |
Capacity(Kg) |
Free Camber(mm) |
Leaves |
Surface Treatment |
LHL3ES710 |
45*8 |
700 |
112 |
3 |
Black/Galvanize/Dacromet |
LHL4ES710 |
45*8 |
1000 |
112 |
4 |
Black/Galvanize/Dacromet |
LHL5ES710 |
45*8 |
1100 |
112 |
5 |
Black/Galvanize/Dacromet |
LHL6ES710 |
45*8 |
1300 |
112 |
6 |
Black/Galvanize/Dacromet |
LHL7ES710 |
45*8 |
1500 |
112 |
7 |
Black/Galvanize/Dacromet |
LHL8ES710 |
45*8 |
1600 |
112 |
8 |
Black/Galvanize/Dacromet |
LHL9ES710 |
45*8 |
1800 |
112 |
9 |
Black/Galvanize/Dacromet |
Heavy Duty Construction:
Our Heavy Duty Truck Trailer leaf spring is designed to provide exceptional durability and reliability for heavy-duty applications, ensuring a smooth ride and extended lifespan.
High-Quality Material:
Constructed from high-quality steel, this leaf spring ensures excellent performance and resistance to corrosion, providing a long-lasting solution for truck suspension systems.
Customized Size:
Our leaf spring is available in customized sizes to fit specific truck models, ensuring a precise fit for the user's vehicle.

