Products
OEM Heavy Duty Truck Leaf Spring
High-performance OEM heavy duty truck suspension leaf springs crafted from premium 52CrMnMoV alloy steel. Certified IATF16949 with 1.5 million fatigue life cycles. Ideal for global commercial fleets. Factory direct wholesale.
Colour: Original / Black
Materials: Spring Steel /52CrMnMoV
Production Processes: Hot Rolling / Forging 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
Our Leaf Spring 3 Series represents the pinnacle of heavy-duty commercial suspension engineering. Designed to excel under severe operational conditions, this OEM suspension leaf spring consists of multiple high-tensile, precisely curved metal strips (leaves) stacked sequentially and securely clamped at their structural centers. Engineered specifically for heavy-duty trucks, commercial trailers, and specialized transport vehicles, this assembly ensures optimal axle load distribution, superior driving stability, and uncompromising reliability on a global scale.
2. Detailed Technical Specifications
| Parameter / Property | Specification Details |
| Product Name | Custom Leaf Spring 3 (Heavy Duty Truck Configuration) |
| Working length (L) | 43.75″ [1111.3 mm] |
| Front end length (L1) | 22.5″ [571 mm] |
| Rear end length (L2) | 21.25″ [539.75 mm] |
| Total weight | 48.4 lb /22 KG |
| Number of leaves | 3 |
| Available Colors | Original Steel Metallic Finish / Industrial Black Coating |
| Materials | 51CrV4/52CrMoV4/60CrMo3-3 |
| Total thickness(H) | 2.21″ [56.2 mm] |
| Free camber height(H1) | 7.73″ [196.34 mm] |
| Spring Eye diameter(D) | 0″ [ 0 mm] |
| Bush in diameter (D1) | 0″ [ 0 mm] |
| Width (W) | 3.0″ [76 mm] |
| Tensile Strength(MPa) | ≥1400 |
| Yield Strength(MPa) | ≥1200 |
| Impact (J) | ≥45 |
| Hardness (HB) | 380-430 |
| Production Processes | Advanced Hot Rolling / Precision Forging Process |
| Heat Treatment | Normalizing → Annealing → Oil Quenching → Tempering |
| Dimensional Tolerance | CNC Trimming for exact accuracy up to ±0.2mm |
| Final Core Hardness | HRC 36 – 40 |
| Surface Finish | Shot Blasting, Precision Polishing, Premium Baking Varnish |
| Fatigue Resistance | ≥ 1.5 Million cycles at rated design load parameters |
| Impact Toughness | Charpy V-notch energy ≥ 35J at extreme cold (-20°C) |
| Certificates | IATF 16949 Automotive Quality Management System Standards |
| Transport Packaging | Export-grade Heavy Duty Wooden Cases |
| Production Lead Time | 15 – 20 Calendar Days (Depending on batch volume) |
3. Key Features & Competitive Advantages
- Elite Fatigue Resistance: Rigorously tested to survive over 1.5 million compression and rebound cycles, vastly extending service lifespan and reducing structural downtime compared to standard carbon steel springs.
- Advanced Material Formula: The implementation of 52CrMnMoV alloy introduces unique combinations of Chromium, Manganese, Molybdenum, and Vanadium, ensuring deep hardenability, supreme elastic limits, and unprecedented sagging prevention.
- Severe-Climate Resilience: With a Charpy V-notch impact toughness rating of ≥35J even at -20°C, this leaf spring prevents sudden brittle fractures in sub-zero operational environments.
- Anti-Corrosive Barrier: The multi-tiered surface treatment—combining high-intensity shot blasting with an industrial baking varnish—creates an impervious barrier against moisture, road salts, and chemical corrosion.
4. Manufacturing Process & Thermal Treatments
To establish perfect structural integrity, every single leaf passes through an automated, tightly monitored production flow:
| Hot Rolling: | Raw 52CrMnMoV ingots are hot-rolled at precise high temperatures to optimize structural grain orientation. |
| Precision Forging: | Ends, eyelets, and critical stress hotspots undergo localized mechanical forging to eliminate micro-voids. |
| CNC Trimming: | Edge contours and central positioning holes are finalized via computer numerical control to hold tight ±0.2mm assembly tolerances. |
| Normalizing (880°C – 920°C): | Eliminates residual internal stresses and establishes a completely homogeneous microstructure. |
| Annealing: | Softens the matrix sufficiently to support stable, micro-crack-free localized machining. |
| Oil Quenching (830°C): | Rapid uniform cooling in premium quenching oils to yield optimal base hardness. |
| Tempering (420°C – 480°C): | Restores critical material toughness and structural elasticity, locking in the target final hardness of HRC 36-40. |
5. Commercial Fleet Applications
Our heavy-duty suspension leaf springs serve as standard or reinforced upgrades for:
Heavy Trucks:
Compatible with leading global makes including Volvo, Scania, Mercedes-Benz, MAN, Isuzu, FAW, and Sinotruk.
Heavy Duty Freight Trailers:
Drop-deck, flatbed, container-handling, and tipper-trailer axle suspension setups.
Specialized Vocational Vehicles:
Mining dumpers, concrete mixers, off-road construction tankers, and military logistics platforms.
6. Matching Components & Accessories
For high-performing suspension upgrades or complete kit configurations, we supply matching components engineered to identical tolerances:
| High-Tensile Center Bolts: | Align and firmly lock the nested leaf stack. |
| Heavy-Duty U-Bolts: | Clamp the leaf spring assembly tightly onto the vehicle axle housing. |
| Suspension Bushings: | Rubber or poly-urethane bushings to damp high-frequency vibration at the spring eyes. |
| Spring Shackles & Alignment Clamps: | Allow smooth longitudinal expansion while preventing sideways leaf separation. |
7. Considerations for Bulk Purchasing
When placing mass wholesale orders for global distribution, international procurers should actively evaluate:
- Technical Blueprint Alignment: Please provide exact OEM part numbers or detailed 2D/3D CAD drawings to align with our CNC trimming tolerances (±0.2mm).
- Axle Weight Configuration: Specify your exact target payload requirements so our engineering team can optimize the leaf stack count and thickness profile.
- Logistics & Packaging: Standard supply arrives in fumigated export wooden cases. Customized color labeling, barcode engraving, and specific palletization can be integrated into pre-production planning.
8. Industry & Buyer FAQ
Q1: Why is 52CrMnMoV steel superior to standard 60Si2Mn or 55CrMnA for heavy truck applications?
A: 52CrMnMoV contains Vanadium (V) and Molybdenum (Mo), which dramatically refine the structural grain size and boost yield strength. This enables significantly deeper hardenability, superior elastic retention, higher fatigue life (1.5M cycles vs. standard ~800k), and prevents sagging or brittle failure under extreme overloads.
Q2: How does shot blasting improve the service life of your leaf springs?
A: Shot blasting fires micro-steel shots at high velocities onto the leaf surfaces, inducing a deep, beneficial residual compressive stress layer. This effectively compresses micro-cracks closed and delays the onset of fatigue propagation during harsh driving conditions.
Q3: Do you provide standard material testing and quality inspection certificates?
A: Yes, every batch ships with comprehensive quality documentation including IATF16949 certificate verification, material chemical analysis reports, hardness mapping (HRC 36-40), Charpy V-notch low-temperature impact tests, and fatigue lifecycle test data.
Q4: What is your standard MOQ and can you accommodate custom dimensions?
A: Because our line utilizes automated CNC trimming and precise thermal protocols, our standard production MOQ is typically 50 to 100 pieces
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.