Heavy-Duty 8-Blade 40" Semi-Elliptical Leaf Spring (4,000kg Pair Capacity / 70x10mm)

The Heavy-Duty 8-Blade 40" Semi-Elliptical Leaf Spring (70x10mm) is an industrial-grade trailer suspension component engineered to provide heavy payload support, lateral axle stability, and controlled shock damping for commercial transport trailers, agricultural implements, industrial plant haulers, and heavy utility chassis. Built with an extra-wide 70 mm blade width by 10 mm individual blade thickness arranged across an 8-blade stack, this suspension assembly is rated for a substantial combined load capacity of 4,000 kg per pair (2,000 kg per individual spring assembly), engineered specifically to handle high dynamic axle loads over corrugated gravel tracks, rough rural terrain, and demanding worksites.

Featuring an extended 40-inch (~1,016 mm) mounting span, the spring configuration distributes severe vertical roadway shock across a broader section of the trailer chassis. The wide 70 mm footprint and thick 10 mm individual leaves provide exceptional torsional and lateral rigidity, effectively controlling trailer sway, chassis lean, and dynamic load shifting when carrying top-heavy machinery, liquid bowsers, or bulk farm produce. Manufactured from premium oil-quenched and tempered high-tensile spring steel, it preserves its arch profile and elastic temper throughout extended, high-mileage commercial duty cycles.

Key Features & Benefits:

• High-Capacity 4,000kg Combined Rating (Per Pair): Delivers robust load-bearing capability of up to 2,000 kg per individual spring, making it suitable for medium-to-heavy commercial freight trailers, machinery carriers, and agricultural machinery.

• Heavy-Gauge 70x10mm Leaf Dimensions: Formed with extra-wide 70 mm leaves and 10 mm individual blade thickness to resist severe bending forces, blade splaying, and bottoming-out under heavy payloads.

• 8-Blade Progressive Multi-Leaf Stack: Multi-layer graduated architecture absorbs roadway shock and cyclic impacts, protecting chassis crossmembers, welds, and heavy axle beams from structural stress fatigue.

• Extended 40-Inch Span (~1,016 mm): The lengthened arc provides deeper, more progressive vertical deflection compared to shorter leaf packs, ensuring controlled ride compliance and reduced bounce when towing.

• High Torsional & Roll Stability: The wide 70 mm leaf footprint maximizes lateral stability to minimize trailer body roll, dynamic swaying, and shifting in high-center-of-gravity loads.

• Quenched & Tempered Spring Alloy Steel: Built from automotive-grade heat-treated spring steel to combat fatigue failure, leaf sagging, and loss of arch height over long working lifetimes.

• Standard Eye-to-Slipper Orientation: Forward rolled and bushed spring eye anchors securely into the front chassis hanger bracket for positive axle tracking, while the rear slipper tail glides freely to allow unrestricted longitudinal travel under compression.

Ideal Applications:

• Commercial & Plant Trailers: Suspension for tandem- and triple-axle plant trailers, bobcat transporters, mini-excavator carriers, and commercial flatbeds.

• Agricultural Implements & Farm Wagons: Heavy-duty running gear for grain carts, liquid fertilizer bowsers, feed wagons, and mobile field machinery.

• Mining & Industrial Service Trailers: Extreme-duty suspension for site diesel bowsers, lighting plants, tool trailers, and mobile compressor skids operating in quarry and industrial environments.

• Livestock & Horse Transporters: Running gear engineered to handle dynamic animal movement and frequent chemical washdown cycles.

• Heavy Caravans & Overland Trailers: High-payload suspension builds designed for demanding, off-grid expedition setups.

Product Specifications:

• Product Name: 8 Blade Spring 40" (70x10)

• Product Category: Suspension / Leaf Springs

• Spring Type: Heavy-Duty Semi-Elliptical Leaf Spring (Eye-and-Slipper Design)

• Number of Blades: 8 Blades

• Spring Length (Mounting Span): 40 Inches (~1,016 mm)

• Blade Dimensions: 70 mm Width x 10 mm Blade Thickness

• Load Rating: 4,000 kg per Pair (2,000 kg per Individual Spring Assembly)

• Installation Orientation: Front Spring Eye mounts towards the front of the trailer

• Material: Quenched & Tempered High-Tensile Automotive Spring Steel

• Application Compatibility: Commercial Trailers, Agricultural Machinery, Plant & Mining Equipment, Heavy Caravans

• Condition: Brand New Heavy-Duty Commercial Vehicle Hardware