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Selecting the appropriate trailer springs is crucial for ensuring the safety, stability, and longevity of your trailer. The right springs absorb road shock, protect your cargo from damage, and contribute to a smoother towing experience. Investing in quality suspension components will prevent premature wear on other parts of your trailer and vehicle.
4 Leaf Spring: 1750 lb Capacity Per Spring; For 3,500 lbs Trailers
Direct Replacement: Kit include: 4 x 5-1/2" long U bolts, U bolts dia. 1/2"; 2 x tie plates for 1-3/4" leaf springs; 8 x 1/2"-20 hex nuts. Fits: For SW4B. This kit is for 3,500lbs round axle which axle beam dia 2-3/8". Attention: The nut must be tightened...
4 Leaf Design: With a 4-leaf design, these leaf springs are 0.5 to 1 times higher load capacity than most springs, with superior strength and longevity.
Why Choose Youxmoto: The leaf springs are made of 60Si2Mn (Manganese Steel) for transmission stability and friction damping; Extra added anti-rust coating for corrosion resistance and long-lasting performance.
Simple installation: easy to maintain; Seamlessly replaces leaf springs damaged by overloading, collision, cracking or corrosion
About The Springs: Each spring offer 3000lbs capacity, suit for standard 5200lbs-6000lbs trailer axle. Eye to Eye length: 25-1/4", Free open: 3", width of leaf: 1-3/4", 5 leaves, 9/16" bushing dia. NOTE: The nut should be tightened horizontally. Failure...
About The Replacement and Material: It will replace for SW5. The Leaf Springs Made of Heavy Duty Carbon Steel for transmission stability and friction damping; Extra added anti-rust coating for corrosion resistance and long-lasting performance.
About The Axle U-bolt Kit: This kit include 4 x 7" long U bolts, U-bolt thread diameter is 1/2",the curvature (inside diameter) of the U-bolt is 3 1/9"; 2 x tie plates for 1-3/4" or 2" leaf springs; 8 x 1/2"-20 hex nuts. And this kit used for 3" dia round...
About The Trailer Axle Hanger Kit: This kit include 2 x EQ-E1 equalizers, 6 x 3" tall hangers, 8 x shackle straps, 14 x 9/16"-18 x 3" long shackle bolts and locknuts. And this kit used for 1-3/4" leaf springs.
After-sales service: Any questions after receiving, please contact us freely. Thanks for choosing us!
Replaces for Part Number: SW4B,not fit square axle,Only fit round axle.
Includes: 2 x 4-Leaves Double Eyes Springs; 3,500lbs axle U-bolt kit for 2-3/8" dia round trailer axles. Kit includes: 4 x 5-1/2" long U bolts, U bolts dia. 1/2", 2 x tie plates for 1-3/4" leaf springs; 8 x 1/2"-20 hex nuts. Complete single trailer axle...
Parameters: 1,750 lb capacity per spring for 3,500 lbs trailers; eye to eye length: 25-1/4 inch, free open: 3 inch, width of leaf: 1-3/4 inch, 4 leaves, 9/16 inch bushing dia, 2 bushings installed for each spring, leaf thickness: 5/16 inch.（Note: The...
Durability: Each of AEAGLE trailer leaf spring kit with anti-rust coating for good corrosion resistance. We always choose raw material with high quality to make our products strong, durable and ensure reliable performance and long use time.
Quality Assurance: 12-month warranty! Tested before shipping.
About The Springs: Each spring offer 1,750lbs capacity, suit for standard 3,500lbs trailer axle. Eye to Eye length: 25-1/4 inch, Free open: 3 inch, width of leaf: 1-3/4 inch, 4 leaves, 9/16 inch bushing dia, 2 Bushings Installed for Each Spring, Leaf...
About The Replacement and Material: It will replace for SW4B. The Leaf Springs Made of Heavy Duty Carbon Steel for transmission stability and friction damping; Extra added anti-rust coating for corrosion resistance and long-lasting performance.
About the axle U-bolt kit: This kit include 4 x 5-1/2" long U bolts, U-bolt thread diameter is 1/2",the curvature (inside diameter) of the U-bolt is 2 4/9"; 2 x tie plates for 1-3/4" leaf springs; 8 x 1/2"-20 hex nuts. And this kit used for 2-3/8" dia...
About the trailer axle hanger kit: This kit include 2 x 3" tall hangers, 2 x 2.1" tall hangers, 4 x shackle straps (eye to eye 3.09"), 6 x 9/16"-18 x 3" long shackle bolts and locknuts. And this kit used for 1-3/4" leaf springs
After-sales service: Any questions after receiving, please contact us freely. Thanks for choosing us!
Fitment Fits for: SW4B; 1750 lb capacity per spring for 3500 lbs trailers. Please check the load rating to ensure that the correct leaf spring is selected.
High Quality Materials: Our trailer leaf spring kits are made of 60Si2Mn (Manganese Steel) for greater strength, flexibility and hardenability. The surface has 2 coats of paint, which has good corrosion resistance.
Accessory Kit: 4 x 5-1/2" long U bolts, U bolts dia. 1/2"; 2 x tie plates for 1-3/4" leaf springs; 8 x 1/2"-20 hex nuts. This kit is for 3,500lbs round axle which axle beam dia 2-3/8".
Trailer Leaf Spring Note: These leaf springs are NOT designed for ANY automobiles of any kind. These will NOT fit cars, trucks, van, or tractors. Please do not buy these UNLESS you are doing so for the trailer they are intended.
Fitment Fits for: SW5; 3000 lb capacity per spring for 6000 lbs trailers. U-bolt kit for 3" dia round trailer axle, Kit include: 4 x 7" long U bolts, U bolts dia. 1/2"; 2 x tie plates for 1-3/4" or 2" leaf springs; 8 x 1/2"-20 hex nuts
High Quality Materials: Our trailer leaf spring kits are made of 60Si2Mn (Manganese Steel) for greater strength, flexibility and hardenability. The surface has 2 coats of paint, which has good corrosion resistance.
Accessory Kit: 4 x 7" long U bolts, U bolts dia. 1/2"; 2 x tie plates for 1-3/4" or 2" leaf springs; 8 x 1/2"-20 hex nuts. Attention: The nut must be tightened horizontally, otherwise it will affect its use
Trailer Leaf Spring Note: These leaf springs are NOT designed for ANY automobiles of any kind. These will NOT fit cars, trucks, van, or tractors. Please do not buy these UNLESS you are doing so for the trailer they are intended.
About The Springs: Each spring offer 1,750lbs capacity, suit for standard 3,500lbs trailer axle. Eye to Eye length: 25-1/4 inch, Free open: 3 inch, width of leaf: 1-3/4 inch, 4 leaves, 9/16 inch bushing dia, 2 Bushings Installed for Each Spring, Leaf...
About The Replacement: It will replace for SW4B. The Leaf Springs Made of Heavy Duty Carbon Steel for transmission stability and friction damping, Extra added anti-rust coating for corrosion resistance and long-lasting performance.
About The Axle U-bolt Kit: This kit include 4 x 5-1/2" long U bolts, U-bolt thread diameter is 1/2",the curvature (inside diameter) of the U-bolt is 2 4/9"; 2 x tie plates for 1-3/4" leaf springs; 8 x 1/2"-20 hex nuts. And this kit used for 2-3/8" dia...
About The Trailer Axle Hanger Kit: This kit include 2 x EQ-E1 equalizers, 6 x 3" tall hangers, 8 x shackle straps, 14 x 9/16"-18 x 3" long shackle bolts and locknuts. And this kit used for 1-3/4" leaf springs.
After-sales service: Any questions after receiving, please contact us freely. Thanks for choosing us!
Replaces for Part Number: SW4B,not fit square axle,Only fit round axle.
Parameters: 1750lbs capacity per spring, for 3500lbs trailers; Eye to eye length 25-1/4 inch; Free open 3-inch; 4 leaves; The width of leaf 1-3/4 inch; Leaf thickness 5/16 inch; 9/16 inch bushing dia, 2 bushings installed for each spring.（Note: The nut...
Kit Includes: 4 x double eyes springs; 3,500lbs axle U-bolt kit for 2-3/8" dia round trailer axles (8 x 5-1/2" long U-bolts, U-bolts dia 1/2", the thread length of the U-bolt bolt is 1.97 inches.4 x tie plates for 1-3/4" leaf springs; 16 x 1/2"-20 hex...
Durability: Each of AEAGLE trailer leaf spring kit with anti-rust coating for good corrosion resistance. We always choose raw material with high quality to make our products strong, durable and ensure reliable performance and long use time.
Quality Assurance: 12-month warranty! Tested before shipping.
Replaces for Part Number: SW4B,not fit square axle,Only fit round axle.
Includes: 2 x 4-Leaves Double Eyes Springs; 3500lbs axle U-bolt kit(Kit includes: 4 x 5-1/2" long U bolts, U-bolt thread diameter is 1/2",the thread length of the U-bolt bolt is 2 inches.the curvature (inside diameter) of the U-bolt is 2 4/9"; 2 x tie...
Parameters: 1750 lb capacity per spring for 3,500 lbs trailers; eye to eye length: 25-1/4", free open: 3", width of leaf: 1-3/4", 4 leaves, 9/16" bushing dia, 2 bushings installed for each spring, leaf thickness: 5/16".（Note: The nut should be tightened...
Durability: Each of AEAGLE trailer leaf spring kit with anti-rust coating for good corrosion resistance. We always choose raw material with high quality to make our products strong, durable and ensure reliable performance and long use time.
Quality Assurance: 12-month warranty! Tested before shipping.
Last update on 2026-09-01 / Affiliate links / Images from Amazon Product Advertising API
How to Choose the Best Trailer Springs
Understanding Trailer Spring Types
Eye-to-Eye Springs: These are the most common type, featuring an eyelet at each end for attaching to the trailer frame and axle. They come in various lengths and load capacities.
Slipper Springs: One end of a slipper spring is attached to the trailer frame, while the other end rests in a hanger and slides freely. This design allows for axle movement and is often used in tandem with other slipper springs.
Double Eye Springs: Similar to eye-to-eye, but with two eyelets on one end, designed for specific mounting configurations.
Key Features to Consider
Load Capacity: Ensure the springs can handle the maximum weight your trailer is designed to carry. Overloading springs can lead to failure and damage.
Length and Width: These dimensions are critical for proper fitment and function within your trailer's suspension system. Measure your existing springs or consult your trailer's manual.
Material and Durability: Look for springs made from high-quality steel alloys that are resistant to rust and fatigue for long-term performance.
Number of Leaves: More leaves generally indicate a higher load capacity and a stiffer ride. The number of leaves should match your trailer's requirements.
Installation and Maintenance
Proper installation is vital for optimal performance and safety. Ensure all bolts are tightened to the manufacturer's specifications. Regular inspection of springs for cracks, rust, or bending can help identify potential issues before they become serious. Cleaning and lubricating moving parts, if applicable, can extend their lifespan.
Frequently Asked Questions
What is the difference between single and double eye trailer springs?
Single eye springs have one eyelet for mounting, typically used in slipper spring setups. Double eye springs have two eyelets on one end, designed for different attachment points on the trailer frame or equalizer.
How do I determine the correct load capacity for my trailer springs?
Consult your trailer's manufacturer specifications or the weight rating on your existing springs. Ensure the new springs' combined capacity exceeds your trailer's Gross Vehicle Weight Rating (GVWR).
Can I mix different types of trailer springs on my trailer?
It is generally not recommended to mix different types of springs, as this can lead to uneven weight distribution and affect towing stability. Stick to the type specified by the trailer manufacturer.
How often should trailer springs be inspected?
Trailer springs should be inspected at least annually, or before and after long trips. Look for any signs of damage, such as cracks, bending, or excessive rust.
What causes trailer springs to break?
Common causes include overloading the trailer beyond its capacity, hitting potholes or rough terrain at high speeds, and material fatigue from age and constant stress.
Are there specific tools needed for trailer spring replacement?
Yes, you will typically need a socket set, wrenches, a jack, jack stands, and potentially a torque wrench to ensure proper installation and tightening of bolts.
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