Heavy-Duty 13-Blade 40" Semi-Elliptical Leaf Spring (8,000kg Pair Capacity / 70x10mm)

The Heavy-Duty 13-Blade 40" Semi-Elliptical Leaf Spring (70x10mm) is an industrial-grade, extreme-capacity suspension assembly engineered to deliver superior payload support, axle stability, and heavy shock absorption for heavy commercial transport trailers, agricultural implements, mining wagons, and industrial plant carriers. Featuring an extra-wide 70 mm blade width by 10 mm individual blade thickness arranged across a massive 13-blade stack, this suspension spring is rated for an exceptional load capacity of 8,000 kg per pair (4,000 kg per spring), built specifically to handle extreme axle loads in demanding off-highway, industrial, and rural environments.

With an extended 40-inch (~1,016 mm) mounting span, the multi-leaf stack distributes extreme vertical loads and dynamic roadway impacts across a broad section of the chassis. The wide 70 mm profile and thick 10 mm leaves provide outstanding lateral and torsional resistance, effectively controlling dangerous trailer sway, body roll, and chassis distortion when maneuvering top-heavy loads, bulk liquids, or heavy tracked machinery over corrugated washboard routes and uneven farm terrain. Formed from high-grade, oil-quenched and tempered spring steel, it maintains its arch profile and elastic temper under continuous cyclic loading.

Key Features & Benefits:

• Extreme-Duty 8,000kg Combined Capacity (Per Pair): Built to support massive axle payloads up to 4,000 kg per individual spring, making it an ideal choice for heavy commercial transport, plant equipment haulers, and high-tonnage agricultural machinery.

• Heavy-Gauge 70x10mm Blade Dimensions: Engineered with wide 70 mm leaves and 10 mm individual blade thickness to resist severe bending forces, blade splaying, and shock-induced deformation.

• 13-Blade Graduated Multi-Leaf Stack: Thick 13-leaf progressive architecture absorbs severe roadway shocks and cyclic impacts, shielding chassis welds, structural outriggers, and axle beams from stress fractures.

• Extended 40-Inch Span (~1,016 mm): The lengthened arc provides smooth, progressive deflection and articulation, preventing harsh bottoming-out while maintaining high stability under full gross vehicle weight.

• High Torsional & Roll Stability: The extra-wide 70 mm footprint delivers exceptional resistance against lateral chassis roll, load shift, and crosswind sway when transporting high-center-of-gravity payloads.

• High-Tensile Quenched & Tempered Spring Steel: Manufactured from automotive-grade, heat-treated spring alloy steel to preserve arch height and combat leaf fatigue over extended high-mileage service.

• Standard Eye-to-Slipper Orientation: Forward rolled and bushed spring eye mounts directly into the forward chassis bracket for positive tracking, while the rear slipper tail allows free longitudinal deflection under compression.

Ideal Applications:

• Heavy Commercial & Plant Trailers: Suspension for heavy tandem- and triple-axle lowbeds, plant equipment haulers, earthmoving equipment carriers, and industrial flatbeds.

• Agricultural Implements & Bulk Wagons: High-tonnage running gear for grain chaser bins, liquid fertilizer tankers, bulk livestock transports, and silage wagons.

• Mining & Heavy Industrial Equipment: Extreme-duty suspension for heavy site bowsers, mobile plant platforms, and large generator skids operating in harsh quarry and open-cast sites.

• Heavy-Duty Forestry & Timber Haulers: High-capacity running gear built to handle demanding timber extraction roads and unpaved logging routes.

Product Specifications:

• Product Name: 13 Blade Spring 40" (70x10)

• Product Category: Suspension / Leaf Springs

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

• Number of Blades: 13 Blades

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

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

• Load Rating: 8,000 kg per Pair (4,000 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: Heavy Commercial Trailers, Agricultural Machinery, Plant & Mining Equipment

• Condition: Brand New Heavy-Duty Commercial Vehicle Hardware