Our Universal Parabolic Leaf Spring is a premium suspension solution engineered for bus applications, delivering exceptional shock absorption, durability, and ride comfort. Designed with advanced parabolic geometry, this leaf spring minimizes interleaf friction, reduces weight, and enhances load – bearing capacity—ensuring smooth operation even under heavy loads or rough road conditions.
Key Features & Benefits
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Parabolic Design: Optimizes stress distribution, reduces fatigue, and extends service life compared to traditional multi – leaf springs.
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High – Performance Materials: Constructed from high – grade alloy steel (60Si2Mn, 55CrMnA) with precision heat treatment for superior strength, toughness, and corrosion resistance.
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Shock Absorption Excellence: Effectively dampens vibrations and impacts, improving passenger comfort and reducing wear on other suspension components (e.g., bushings, shock absorbers).
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Universal Compatibility: Suitable for a wide range of bus models (e.g., city buses, coach buses, school buses) with customizable dimensions (length, arc height, leaf thickness) to meet specific OEM requirements.
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Direct Supply Model: Eliminates middlemen, offering competitive pricing and fast delivery for bulk orders or urgent projects.
Technical Specifications (Customizable)
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Material: Alloy Steel ( 60Si2Mn, 55CrMnA)
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Surface Treatment: Shot peening, electrophoresis, or painting (for corrosion protection)
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Load Capacity: 5000lbs
Applications
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City transit buses
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Intercity coach buses
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School buses
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Tourist buses
🏭About Zhengzhou Haishuo Automotive Parts Co., Ltd.
Production Capacity: Over 4,000 tons of leaf springs in stock, enabling rapid order fulfillment
Global Reach: Exported to over 100 countries and regions, including North America, South America, Eastern Europe, Southeast Asia, Africa, Oceania, the Middle East, and Western Europe
OEM/ODM Services: Custom manufacturing available for private label, OEM, and aftermarket projects
Quality Assurance: Backed by SGS audit certification, with dedicated QA/QC inspectors ensuring every product meets international standards
Comprehensive Product Line: Our catalog includes heavy-duty, conventional, parabolic, and trailer leaf springs, plus complete accessories like U-bolts, bushings, clips, and shackles
Leaf Spring Technical Parameters
| Item | Specification |
|---|---|
| Material | 50CrVA / 51CrV4 / 55CrMnA / 60Si2Mn |
| Width | 60mm – 120mm |
| Thickness | 6mm – 30mm |
| Load Capacity | 500kg – 20,000kg |
| Surface Treatment | Painting / E-coating |
📦Packaging, Shipping & Terms
Packaging: Standard export wooden crates or cartons with protective wrapping to prevent damage during transit
Shipping Ports: Qingdao Port, Tianjin Port and LianYun Port
Lead Time: 30 days (peak season) / 30 days (off season)
Accepted Incoterms: FOB, EXW, DDP, CIF, CFR
Payment Terms: L/C, T/T, D/P, PayPal, Western Union, small-amount payment options available
After-Sales Support: Professional sales and technical team providing order follow-up, product consultation, and after-sales service
Why Choose Our Leaf Springs
- Manufactured using high-strength alloy steel (SUP9 / 60Si2Mn)
- Heat-treated for improved hardness and fatigue resistance
- Shot peening surface treatment for longer service life
- Strict load and fatigue testing before shipment
- OEM interchangeable fitment with Dongfeng systems
- Stable performance under heavy-duty working conditions
FAQ
Q1: Is this part OEM or aftermarket?
A: It is an OEM-compatible replacement designed for Dongfeng truck suspension systems.
Q2: What material is used in this leaf spring?
A: High-strength alloy steel such as SUP9 or 60Si2Mn.
Q3: Can you produce customized leaf springs?
A: Yes, OEM and customized production is available.
Q4: What is your delivery time?
A: Typically 20–30 days depending on order quantity.
Q5: What vehicles is it compatible with?
A: It is suitable for various Dongfeng heavy-duty truck platforms.
Common Problems of Worn Leaf Springs
Vehicle tilting or sagging on one side
Reduced load-carrying capacity
Excessive vibration during driving
Visible cracks or deformation on spring leaves
When to Replace Leaf Springs
Leaf springs should be replaced when fatigue cracks, deformation, or reduced elasticity are observed. Delayed replacement may affect vehicle safety and suspension performance.
Important Notes
This product is an aftermarket replacement part, not an original OEM part. It is designed to fit the specified applications as a direct replacement component.
We recommend professional installation by a qualified technician to ensure proper fit, alignment, and safety.
contact us with your vehicle details or custom requirements, and our team will assist you in finding the right leaf spring solution.
