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American Navistar Front Leaf Spring 55-144 For Heavy Duty Truck

Short Description:

Part No. 55-144 Paint Electrophoretic paint
Spec. 101*21 Model Heavy Duty
Material SUP9 MOQ 100 SETS
Free Arch 112mm±5 Development Length 1474
Weight 44 KGS Total PCS 2 PCS
Delivery Time 15-30 days Warranty 12 months

Product Detail

Product Tags



The leaf spring is suitable for semi-trailer

1. The item total has 2 pcs, the raw material size is 101*21
2. Raw material is SUP9
3. The free arch is 112±21mm, the development length is 1474(737+737), the ears have diameter of 44
4. The painting use electrophoretic painting
5. We also can produce base on client's drawings to design
6. This type of leaf spring is suitable for the International/ Navistar 8200/8300/9200/9300SBA/9400

Do semi trailers have leaf springs?

Weighing the pros and cons of heavy-duty leaf springs is crucial. These springs excel in providing enhanced support, stability, and increased load capacity for vehicles. However, they also pose some significant challenges.

One key drawback is their tendency to stiffen the vehicle, especially noticeable when carrying lighter loads. This can result in a less comfortable ride for passengers, potentially sacrificing overall comfort. Moreover, the added weight of heavy-duty leaf springs can hamper fuel efficiency and vehicle performance, reducing traction on uneven terrain and affecting handling.

Furthermore, these springs often come with a higher price due to their reinforced construction and specialized design, leading to increased expenses for purchase and installation.

Additionally, heavy-duty leaf springs may require more frequent maintenance and inspections to ensure optimal performance, resulting in higher maintenance costs and inconvenience for vehicle owners.

While heavy-duty leaf springs offer substantial benefits, it's essential to carefully weigh these potential drawbacks before making a decision.



How do I know what leaf springs I need for my trailer?

Keeping leaf springs well-maintained is vital for optimal vehicle performance and safety. These suspension components carry the vehicle's weight and absorb road shocks, making them crucial for overall vehicle health.

Regular visual checks of leaf springs are essential to catch signs of wear, damage, or corrosion early. It's crucial to look for cracks, deformities, or indications of metal fatigue that could compromise the leaf spring's integrity. Proper alignment and installation help prevent uneven wear and operational issues.

Applying suitable lubricants regularly is important to prevent metal-on-metal contact and reduce friction, preserving leaf spring flexibility and performance, especially in tough conditions.

Any issues found during inspections should be addressed promptly by a qualified technician, whether it involves repairing minor damage, replacing worn components, or realigning leaf springs. Routine maintenance tasks include tightening U-bolts, following torque specifications, and replacing old bushings.

For commercial and off-road vehicles, periodic load testing and suspension system inspections are advisable to ensure leaf springs work within set parameters. This proactive approach helps detect weakening or loss of load-bearing capacity early, enabling preventive maintenance or timely replacement.

In summary, meticulous care and maintenance of leaf springs are essential for vehicle longevity and safety. Regular inspections, proper lubrication, prompt issue resolution, and load testing are vital measures to extend leaf spring lifespan and prevent suspension-related problems. Working with qualified professionals and following manufacturer guidelines are crucial for effective leaf spring maintenance and repair.



Provide different types of leaf springs which include conventional multi leaf springs, parabolic leaf springs, air linkers and sprung drawbars.
In terms of vehicle types, it include heavy duty semi trailer leaf springs, truck leaf springs, light duty trailer leaf springs, buses and agricultural leaf springs.

Packing & Shipping


QC equipments


Our advantage

Quality aspect:

1) Raw Material

Thickness less than 20mm. We use material SUP9

Thickness from 20-30mm. We use material 50CRVA

Thickness more than 30mm. We use material 51CRV4

Thickness more than 50mm. We choose 52CrMoV4 as the raw material

2) Quenching Process

We strictly controlled the steel temperature around 800 degree.

We swing the spring in the quenching oil among 10 seconds according to the spring thickness.

3) Shot Peening

Each assembling spring set under stress peening.

Fatigue test can reach over 150000 cycles.

4) Electrophoretic Paint

Each item use electrophoretic paint

Salt spray testing reach 500 hours

Technical aspect

1. Reliable Performance: Leaf springs exhibit consistent performance attributes, ensuring occupants experience predictable handling and ride comfort throughout their use.
2. Efficient Weight Distribution: By effectively distributing the vehicle's weight and cargo, leaf springs enhance load balance and promote overall stability.
3. Superior Impact Absorption: Leaf springs excel at absorbing and cushioning the impact of uneven road surfaces, resulting in a smoother and more comfortable ride.
4. Enhanced Corrosion Resistance: Through proper treatment and coating, leaf springs demonstrate excellent resistance to corrosion, extending their lifespan and reliability across diverse environmental conditions.
5. Environmental Sustainability: The recyclability and reusability of leaf springs contribute to environmental sustainability by conserving resources and promoting eco-friendly practices.

Service aspect

1、Customization: Our factory can tailor leaf springs to meet specific customer requirements, such as load capacity, dimensions, and material preferences.
2、Expertise: Our factory’s staff possess specialized knowledge and skills in designing and manufacturing leaf springs, ensuring high-quality products.
3、Quality control: Our factory implements rigorous quality control measures to guarantee the reliability and durability of its leaf springs.
4、Production capacity: Our factory has the capability to produce leaf springs in large quantities, meeting the demands of various industries and customers.
5、Timely delivery: Our factory’s efficient production and logistics processes enable it to deliver leaf springs within specified timelines, supporting customer schedules.

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