5 Best Axle and Springs for Trailer: Options Compared

When your trailer’s suspension starts to sag or bounce, it’s time to consider a replacement axle and spring kit. A reliable setup ensures a smoother tow and protects your cargo from jarring impacts.

This guide compares five complete tandem trailer axle suspension kits, ranging from 3,500 lb to 6,000 lb capacities. You’ll find the right combination of leaf springs, U-bolts, and hangers to restore your trailer’s ride quality and safety.

SEHNSUCHT 4 Leaf Spring Kit – 3500lb Tandem Setup

The SEHNSUCHT 4 Leaf kit is built for standard 3,500 lb tandem trailer axles. Each spring offers 1,750 lb capacity with a 25-1/4 inch eye-to-eye length, 3 inch free open, and 1-3/4 inch leaf width. The heavy-duty carbon steel construction includes an extra anti-rust coating for long-lasting performance.

This complete suspension kit includes four 5-1/2 inch long U-bolts with 1/2 inch thread diameter, two tie plates, two EQ-E1 equalizers, and six 3 inch tall hangers. It directly replaces the SW4B part number, making installation straightforward. The double eye spring design provides reliable friction damping and stability for light to medium-duty towing.

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• 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 Thickness 5/16 inch. NOTE: The nut should be tightened horizontally. Failure to do so will affect the final user experience.
• 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 round trailer axles.(This product offer 2* U-bolt kit).
• 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!

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SEHNSUCHT 5 Leaf Spring Kit – 6000lb Heavy Duty

For heavier trailers, the SEHNSUCHT 5 Leaf kit handles up to 6,000 lb tandem axles. Each spring provides 3,000 lb capacity with five leaves, a 25-1/4 inch eye-to-eye length, 3 inch free open, and 1-3/4 inch width. The heavy-duty carbon steel with anti-rust coating ensures durability under demanding loads.

This kit includes four 7 inch long U-bolts with 1/2 inch thread diameter and a 3-1/9 inch inside curvature, two tie plates, two EQ-E1 equalizers, six 3 inch tall hangers, and eight shackle straps. It replaces the SW5 part number and is designed for standard 5,200-6,000 lb trailer axles. The five-leaf configuration offers increased load support and stability for heavy cargo.

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• 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 to do so will affect the final user experience.
• 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 trailer axle.(This product offer 2* U-bolt kit).
• 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!

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dreamdragon Tandem Kit – 3500lb 4 Leaf Springs

The dreamdragon kit is tailored for 3,500 lb trailer axles, with each leaf spring rated at 1,750 lb. It features a 25-1/4 inch eye-to-eye length, 3 inch free open height, 1-3/4 inch leaf width, and a 9/16 inch bushing diameter. The four-leaf design provides dependable suspension for light to medium-duty trailers.

This comprehensive package includes four leaf springs, two equalizers, six tall hangers, eight shackle straps, and 14 lock washers. The U-bolt set is designed for 2-3/8 inch diameter round axles, with four 5-1/2 inch long U-bolts and two tie plates. The kit offers smooth operation and easy installation, making it a convenient all-in-one solution for your trailer suspension needs.

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• Each Trailer Leaf Spring is rated for 1,750 lbs, making it an ideal choice for standard 3,500 lbs trailer axles, providing dependable suspension support for light to medium-duty trailers.
• Featuring a 25-1/4" eye-to-eye length, 3" free open height, and 1-3/4" leaf width, this 4-leaf spring with 9/16" bushing diameter offers both durability and smooth operation.
• The kit includes a U-bolt set designed for 3,500 lbs axles with a 2-3/8" diameter round axle, consisting of 4 U-bolts (5-1/2" long, 1/2" dia.), 2 tie plates for 1-3/4" leaf springs, and 8 hex nuts for easy installation.
• Accessory Kit: 4pcs 4 leaf springs, 2pcs equalizers, 6pcs tall hanger, 8pcs shackle straps, 14pcs long shackle bolts and locknuts, 8pcs long U bolts, 16pcs hex nuts, 4pcs tie plates for leaf springs
• Trailer Leaf Spring Note! These leaf springs kit are ONLY designed for the trailer. Any questions after receiving Trailer Axle Suspension Kit , please contact us freely

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Youxmoto 5 Leaf Spring Kit – 5200-6000lb Capacity

The Youxmoto kit delivers 3,000 lb per spring with five leaves, designed for 5,200-6,000 lb tandem trailer axles. It measures 25-1/4 inches eye-to-eye, 1-3/4 inches wide, with a 9/16 inch bushing diameter. The direct replacement for SW5 ensures compatibility with many trailers.

This complete set includes four 7 inch long U-bolts with 1/2 inch diameter, two tie plates for 1-3/4 or 2 inch leaf springs, two EQ-E1 equalizers, six 3 inch tall hangers, eight shackle straps, and 14 lock washers. The kit is designed for 3 inch diameter round trailer axles. Youxmoto emphasizes proper horizontal nut tightening during installation to ensure safe and reliable performance.

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• Youxmoto 4pcs 5 Leaf Springs 3000lb, for 5200lb-6000lb Tandem Trailer Axle Suspension Kit
• DIRECT REPLACEMENT: Replace For SW5. Attention: The nut must be tightened horizontally, otherwise it will affect its use
• COMPLETE ACCESSORIES: Include 5,200-6000lbs axle 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.
• EASY INSTALLATION: Include Complete tandem trailer axle hanger kit for 1-3/4" leaf springs, 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.
• WHY CHOOSE Youxmoto: 5-leaf design, Leaf Springs Made of Heavy Duty Carbon Steel for transmission stability; Extra added anti-rust coating for corrosion resistance and long-lasting performance.

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AEagle 4 Leaf Spring Kit – 3500lb Trailer Axle

The AEagle 4 Leaf kit is a direct replacement for SW4B, designed for 3,500 lb trailer axles. Each spring offers 1,750 lb capacity with a 25-1/4 inch eye-to-eye length, 3 inch free open, 1-3/4 inch width, and 9/16 inch bushing diameter. The double eye design and anti-rust coating enhance durability and corrosion resistance.

This kit includes two 4-leaf double eye springs, a U-bolt set for 2-3/8 inch diameter round axles with four 5-1/2 inch long U-bolts, two tie plates, two equalizers, six 3 inch tall hangers, eight shackle straps, and 14 lock washers. AEagle uses high-quality raw materials for strength. Note that this kit fits round axles only, not square axles, so verify your axle type before purchase.

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• 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 hanger kit for 1-3/4" leaf springs, Kit includes: 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
• 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 nut should be tightened horizontally. Failure to do so will affect the final user experience）
• 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.

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Buyer’s Guide: What to Consider

Choosing the right axle and spring kit for your trailer involves matching capacity, axle type, and hardware. Here are five key factors to consider before purchasing.

• Load Capacity: Match the spring capacity to your trailer's gross axle weight rating. 1,750 lb springs suit 3,500 lb axles; 3,000 lb springs suit 5,200-6,000 lb axles.
• Leaf Spring Count: More leaves generally mean higher load capacity and stiffness. Four-leaf springs are common for light to medium duty; five-leaf springs handle heavier loads.
• Axle Compatibility: Ensure the kit fits your axle diameter and shape. Most kits fit 2-3/8 or 3 inch round axles. Square axles require specific parts not included in these kits.
• Hardware Inclusions: A complete kit saves time and ensures proper fit. Look for U-bolts, tie plates, equalizers, hangers, shackle straps, and lock washers included.
• Corrosion Resistance: Trailers face moisture and road salt. Kits with anti-rust coatings or galvanized hardware offer longer service life and reduced maintenance.

Conclusion

Selecting the best axle and springs for your trailer depends on your load requirements and axle specifications. For 3,500 lb trailers, the SEHNSUCHT 4 Leaf or AEagle kits offer reliable performance. For heavier 5,200-6,000 lb loads, the SEHNSUCHT 5 Leaf or Youxmoto kits provide the extra capacity you need.

Whichever kit you choose, ensure it matches your axle diameter and shape. A complete kit with all hardware simplifies installation and gets you back on the road safely.