Products
Custom Trailer Suspension Leaf Springs
High-performance custom trailer suspension leaf springs engineered from premium 52CrMnMoV steel. IATF16949 certified, exceptional fatigue resistance, and fast 15-20 days delivery. Ideal for commercial trailers, trucks, and heavy-duty vehicles.
Colour: Original / Black
Materials: Spring Steel /52CrMnMoV
Production Processes: Hot Rolling Process
Heat Treatment: Normalizing, Annealing, Quenching, Tempering
Surface Finish: Shot Blasting, Polishing, Baking Varnish
Certificates: IATF16949
Transport Package: Wooden Case
Delivery Time: 15-20 Days
1. Product Overview
Engineered for the most demanding commercial and heavy-duty applications, our Custom Trailer Suspension Springs deliver unmatched durability, stability, and load-bearing capacity. Manufactured from premium 52CrMnMoV spring steel through advanced hot rolling processes, these components ensure reliable performance in challenging operating conditions. With a precisely calibrated design, our leaf springs provide optimal elasticity and shock absorption, maintaining vehicle stability even under maximum payloads.
2. Detailed Specifications
| Parameter | Specification |
| Product Name | Custom Trailer Suspension Leaf Spring |
| Working length (L) | 72″ [1830 mm] |
| Front end length (L1) | 36″ [915 mm] |
| Rear end length (L2) | 36″ [915 mm] |
| Total weight | 165.5 lb /75.2 KG |
| Number of leaves | 3 |
| Tensile Strength(MPa) | ≥1400 |
| Yield Strength(MPa) | ≥1200 |
| Impact (J) | ≥45 |
| Hardness (HB) | 380-430 |
| Total thickness(H) | 4.4″ [112 mm] |
| Free camber height(H1) | 5.9″ [150 mm] |
| Spring Eye diameter (D) | 2.36″ [60 mm] |
| Bush in diameter (D1) | 0.96″ [24.5 mm] |
| Width (W) | 3.54″ [90 mm] |
| Materials | 51CrV4/52CrMoV4/60CrMo3-3 |
| Color | Original / Black (Custom RAL colors available) |
| Hardness | HRC 35 – 39 |
| Operating Temperature | -25°C to +100°C |
| Elastic Elongation | ≥ 9% |
| Max Deflection | 60% of free height |
| Dynamic Load Capacity | 2×10⁶ cycles at 75% WLL (Working Load Limit) |
| Safety Factor | 2.5:1 Minimum |
| Certifications | IATF 16949 |
| Delivery Time | 15 – 20 Days |
| Transport Package | Heavy-Duty Export Wooden Case |
3. Key Features
- Superior Material & Mechanical Properties: Constructed from 52CrMnMoV steel, offering exceptional fatigue resistance capable of withstanding over 2 million load cycles.
- Extreme Climate Resilience: Excellent low-temperature toughness (Charpy V-notch ≥40J at -20°C) guarantees reliable performance in freezing climates, while maintaining stable operation up to +100°C.
- High Precision: Manufactured with strict dimensional tolerances (±0.25mm) ensuring perfect fitment and seamless fleet integration.
- Optimized Carbon Content: Delivers the ideal balance of elasticity and rigidity for smooth operation and heavy payload support.
4. Advanced Manufacturing Process
| Precision Hot Rolling & CNC Trimming: | Each spring undergoes hot rolling for optimal grain structure alignment, followed by CNC trimming to maintain exact dimensions. Intermediate stress-relieving operations prevent micro-fractures. |
| Rigorous Heat Treatment: | A comprehensive thermal protocol includes Normalizing (850-900°C), Annealing, Oil Quenching (820°C), and Tempering (400-450°C) to achieve a perfect hardness-to-toughness ratio. |
| Surface Finishing: | Includes SAE J444 compliant shot blasting for superior paint adhesion, precision grinding (Ra 2.5μm) for critical contact areas, and durable electrostatic powder coating or baking varnish to prevent corrosion. |
5. Industry Applications
Our versatile trailer suspension springs are designed to support a wide range of vehicles:
| Heavy-Duty Commercial Trailers: | Flatbeds, lowboys, dump trailers, and cargo carriers. |
| Agricultural Machinery: | Tractors, wagons, and heavy farming implements. |
| Utility & Recreational Vehicles: | RVs, camper trailers, and light-to-medium duty utility trailers. |
| Specialty Transport: | Mining vehicles, logging trailers, and off-road fleet transport. |
6. Complementary Accessories & Mating Parts
To ensure a complete and safe suspension system upgrade or installation, we also provide or recommend the following mating components:
| U-Bolts & Nuts: | High-tensile steel bolts for securing the leaf springs to the trailer axle. |
| Center Bolts: | Crucial for keeping the individual leaves aligned. |
| Spring Shackles & Hangers: | Heavy-duty mounts to attach the springs to the trailer chassis. |
| Polyurethane / Bronze Bushings: | For reducing friction and wear at the spring eyes. |
| Equalizers: | Essential for tandem or tri-axle configurations to distribute weight evenly. |
7. Bulk Purchasing Considerations
For procurement managers and fleet operators, please note the following when placing wholesale orders:
Customization Capabilities:
We offer OEM/ODM services. Send us your CAD drawings or specifications, and we can customize spring rates, dimensions, and material grades (e.g., SUP6, SUP7, SUP9).
Lead Time Planning:
Our standard delivery time is 15-20 days. For extra-large bulk orders or highly customized shapes, please consult our team to align with your production schedule.
Packaging & Logistics:
All springs are securely packed in heavy-duty wooden cases, treated with rust-preventative oils to ensure they arrive in pristine condition, regardless of sea freight duration.
Quality Traceability:
Complete material traceability is maintained. We provide mill test reports and heat treatment certificates with every batch shipment.
8. Frequently Asked Questions (FAQ)
Q1: Why do you use 52CrMnMoV steel for your leaf springs?
A: 52CrMnMoV is a premium alloy spring steel. The addition of Chromium, Manganese, Molybdenum, and Vanadium provides superior hardenability, higher fatigue life, and better impact toughness compared to standard carbon steels, making it ideal for heavy payloads and harsh environments.
Q2: Can you manufacture leaf springs according to my custom drawings?
A: Yes, absolutely. Our engineering team provides comprehensive technical support. We accept CAD models in multiple formats and can manufacture custom configurations, including unique spring rates and application-specific reinforcements.
Q3: What kind of quality testing do your springs undergo?
A: Our IATF 16949 certified facility conducts 100% dimensional verification using Coordinate Measuring Machines (CMM), magnetic particle inspection for hidden surface defects, and batch destructive testing to guarantee mechanical limits.
Q4: What is your standard packaging for international shipping?
A: To prevent corrosion and physical damage during transit, we pack our suspension springs in sturdy, export-standard wooden cases.
Q5: Do you offer engineering and installation support?
A: Yes! Our technical department offers load capacity calculations for your specific applications and detailed installation guidelines to ensure optimal performance.
Partner with industry-leading precision casting experts to bring your vision to life. We specialize in delivering custom, high-quality casting solutions. With years of experience, cutting-edge technology, and an unwavering commitment to excellence, we ensure every component exceeds your expectations.