Key Features of Trailer Leaf Springs
⚙️
Acts as the main suspension part for your trailer and provides attachment point for the wheel axle.
🛡️
Multiple spring leaves offer flexibility to resist shock and ensure a smooth ride on uneven roads.
📈
Reduces wear and tear of trailer while ensuring level ride on bumpy surfaces.
💎
Sturdy spring steel performance with nylon bushings included for durability.
Installation Guide
Hangers, fishplates, and U-bolts/ hanger kit (to be purchased separately) are required for installation. Springs are mounted on the trailer frame at one end and connect to a shackle or equalizer on the other end.
Leaf Spring Specification
Specification Chart for Main Types of Double Eye Trailer Leaf Springs
| Part# |
Type |
Free Length (mm) |
Free Arch (mm) |
Capacity (lb) |
Capacity (Kg) |
Leaves |
| 5155HDAC | DE | 508 | 76.2 | 2000 | 908 | 3 |
| 679372 | DE | 632 | 85.7 | 3500 | 1590 | 6 |
| 702095 | DE | 641.3 | 76.2 | 2600 | 1180 | 4 |
| 702096 | DE | 638 | 79.4 | 3000 | 1362 | 4 |
| 72-09 | DE | 587 | 88.9 | 1750 | 795 | 3 |
| 72-17-2 | DE | 517.5 | 81 | 1000 | 454 | 2 |
| 72-18 | DE | 587 | 92 | 2000 | 908 | 4 |
| 72-22 | DE | 638 | 81 | 1250 | 568 | 3 |
| 72-34 | DE | 756 | 111 | 1250 | 567 | 3 |
| 72-42 | DE | 641.3 | 76.2 | 1750 | 795 | 4 |
| 72-73 | DE | 644.5 | 72 | 3000 | 1362 | 5 |
| 72-78 | DE | 641.3 | 79.4 | 2200 | 1000 | 4 |
| 72-79 | DE | 632 | 85.7 | 4000 | 1815 | 7 |
| 93183 | DE | 590.6 | 76.2 | 2900 | 1135 | 4 |
| AWS-4 | DE | 660 | 108 | 2000 | 908 | 4 |
| AWS-8 | DE | 660 | 108 | 4000 | 1815 | 8 |
| EMCO-041 | DE | 508 | 88.9 | 1500 | 680 | 3 |
| EMCO-114 | DE | 594 | 92 | 1500 | 681 | 4 |
| PR427 | DE | 686 | 70 | 1500 | 681 | 4 |
| PR-5 | DE | 641.3 | 76.2 | 3000 | 1360 | 5 |
| SW-3 | DE | 641.3 | 76.2 | 1750 | 795 | 3 |
| 6B8246 | DE | 641.3 | 89 | 1250 | 568 | 3 |
Application Scenarios
What Is a Leaf Spring?
A leaf spring is a simple yet highly effective suspension component used in trailers and vehicles for load-bearing and shock absorption. Unlike complex coil or air suspensions, leaf springs consist of stacked strips of metal (called "leaves") that flex under pressure. Commonly found in utility trailers, RVs, trucks, and off-road equipment, trailer leaf springs are known for their durability, low maintenance, and ability to handle heavy loads consistently over time.
What Does a Leaf Spring Do?
The primary function of a leaf spring is to absorb road shocks and distribute loads evenly across the trailer axle. When a trailer hits a bump or uneven terrain, the leaf spring flexes to reduce the impact, maintaining stability and comfort. This protective role prevents excessive bouncing, swaying, or bottoming out, especially when carrying heavy loads.
How Do Leaf Springs Work?
Leaf springs operate on the principle of elasticity. Each leaf is slightly curved and clamped together with a central bolt. When weight is applied, the spring compresses and flattens out, storing energy as it flexes. When the load shifts or reduces, the spring returns to its original shape, releasing energy and stabilizing the trailer once again.
Core Advantages
Unmatched Strength & Load Capacity: Inherently strong design for heavy equipment and industrial materials.
Superior Durability: Constructed from high-tensile steel to withstand harsh road conditions.
Simplicity & Reliability: Fewer complex components mean fewer failure points and easier maintenance.
Cost-Effectiveness: Proven value from initial purchase through long-term operation.
Custom Leaf Spring Solutions
Heavy-duty vehicles operate under extreme conditions. Custom leaf spring solutions are essential when standard components cannot support specific load capacities. Tailored engineering ensures optimal stress distribution and long service life for trucks, trailers, buses, and agricultural machinery. Advanced manufacturing processes, including precise heat treatment and surface finishing, improve wear resistance and corrosion protection.
Customer Testimonials
Rick, Florida
"Outstanding Durability for My Boat Trailer"
I replaced my old suspension with these new trailer leaf springs, and the difference was immediate. My boat trailer now rides so much smoother, even over rough back roads.
Jenna, Texas
"Best Upgrade for Heavy Hauling"
As someone who hauls construction materials almost daily, I need a reliable suspension. The multi-leaf design handles weight like a champ. Highly recommended!
Logan, Oregon
"Easy Replacement & Performance"
The spring fit my utility trailer perfectly and improved stability immediately. I was worried about compatibility, but the product delivered exactly what was promised.
Frequently Asked Questions
How do I choose the correct capacity for my trailer leaf springs?
You should match the capacity of the leaf springs to your trailer's Gross Vehicle Weight Rating (GVWR). Ensure the combined capacity of all springs meets or exceeds the maximum load your trailer will carry.
What is the difference between double-eye and slipper leaf springs?
Double-eye springs have a hole (eye) at both ends for mounting, offering a smoother ride. Slipper springs have an eye at one end and a flat tail that "slips" into a bracket, typically used for much heavier loads.
How often should trailer leaf springs be replaced?
There is no fixed schedule, but you should inspect them annually. Replace them immediately if you see cracks, severe rusting, or if the trailer begins to sag or bounce excessively.
Should I replace leaf springs in pairs?
Yes, it is highly recommended to replace leaf springs in pairs. Replacing only one side can cause uneven height and weight distribution, leading to poor handling and accelerated wear on the new part.
What measurements are needed to buy replacement springs?
You need the "Free Length" (distance between the centers of the eyes), the "Free Arch" (vertical distance from the center of the eyes to the top of the leaf), and the width of the leaf.
Do your leaf springs come with bushings?
Yes, standard trailer leaf springs usually include pre-installed nylon bushings to ensure a smoother installation and reduced friction.
