Heavy-Duty 7-Blade 41" Semi-Elliptical Leaf Spring (4,000kg Pair Capacity / 76x7mm)

The Heavy-Duty 7-Blade 41" Semi-Elliptical Leaf Spring (76x7mm) is a commercial-grade, extended-span trailer suspension component engineered to deliver robust payload support, superior dynamic load absorption, and chassis stability for commercial freight trailers, touring caravans, heavy utility haulers, and agricultural transport chassis. Featuring an extra-wide 76 mm blade width by 7 mm individual blade thickness arranged across a 7-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 heavy axle loads across corrugated gravel tracks, rough rural roads, and highway routes.

Spanning an extended 41-inch (~1,041 mm) mounting length, the spring configuration distributes severe vertical roadway shock and dynamic axle loads across a broader section of the trailer chassis. The wide 76 mm leaf footprint provides outstanding lateral and torsional resistance, effectively controlling trailer sway, body roll, and chassis twist when hauling top-heavy cargo, equipment, or bulk goods. Manufactured from premium oil-quenched and tempered high-tensile automotive spring steel, it preserves its arch profile and elastic temper under demanding, 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, equipment haulers, and multi-axle chassis.

• Extra-Wide 76x7mm Leaf Profile: Formed with wide 76 mm leaves and 7 mm individual blade thickness to resist severe bending forces, blade splaying, and bottoming-out under heavy payloads.

• Extended 41-Inch Span (~1,041 mm): Longer arch length provides deeper, more progressive vertical deflection compared to shorter springs, smoothing out roadway shock to protect chassis welds and sensitive cargo.

• 7-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.

• High Torsional & Roll Stability: The wide 76 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 & Cargo Trailers: Heavy running gear for single- and tandem-axle goods trailers, commercial flatbeds, and enclosed freight haulers.

• Touring Caravans & Campers: Extended-span suspension delivering a compliant, stable ride that cushions interior cabinetry, appliances, and fittings against long-distance vibration.

• Heavy Utility & Plant Trailers: Suspension for machinery carriers, contractor flatbeds, and equipment haulers running wide-spring hanger setups.

• Agricultural Implements & Farm Trailers: Durable running gear for field service carts, bulk wagons, and farm transport trailers operating over uneven ground.

• Livestock Transporters & Horseboxes: Running gear built to support dynamic animal movement while reducing body roll and trailer sway.

Product Specifications:

• Product Name: 7 Blade Spring 41" (76x7)

• Product Category: Suspension / Leaf Springs

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

• Number of Blades: 7 Blades

• Spring Length (Mounting Span): 41 Inches (~1,041 mm)

• Blade Dimensions: 76 mm Width x 7 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, Caravans, Horseboxes, Utility & Agricultural Vehicles

• Condition: Brand New Heavy-Duty Commercial Vehicle Hardware