4-Blade 27" Semi-Elliptical Leaf Spring (750kg Pair Capacity)

The 4-Blade 27" Semi-Elliptical Leaf Spring is a trailer suspension component engineered to provide balanced payload support, progressive road damping, and reliable axle tracking for light commercial trailers, camping trailers, domestic utility haulers, and lightweight caravans. Rated for an axle capacity of 750 kg per pair (375 kg per individual spring assembly), this 4-blade spring stack utilizes an industry-standard 27-inch (~685 mm) mounting span to deliver a stable, compliant ride calibrated for unbraked and light-braked trailer chassis.

Manufactured from oil-quenched and tempered high-tensile automotive spring steel, the graduated 4-blade architecture provides a progressive spring rate that smooths out bumps and surface imperfections while retaining adequate stiffness to prevent bottoming out under full load. Designed in a standard eye-and-slipper layout, the rolled forward eye anchors securely into the front chassis bracket for accurate axle tracking, while the rear slipper tail slides smoothly inside the rear hanger to allow unrestricted elongation under road compression.

Key Features & Benefits:

• Calibrated 750kg Combined Capacity (Per Pair): Optimized for standard unbraked utility trailers and light caravans, supporting up to 375 kg per individual spring assembly.

• 4-Blade Graduated Leaf Stack: Delivers progressive resistance to absorb roadway shocks, protecting chassis crossmembers, welds, and delicate cargo from stress fatigue.

• Industry-Standard 27-Inch Span (~685 mm): Matches standard light-commercial hanger spacing and axle mounting hardware, providing seamless fitment for new builds or direct drop-in replacement.

• Controlled Articulation & Reduced Bounce: Mitigates unladen trailer hopping while providing necessary compliance under moderate payloads.

• Quenched & Tempered Spring Alloy Steel: Automotive-grade heat treatment ensures elasticity, fatigue resistance, and long-term retention of arch camber under repeated cyclic loading.

• Standard Eye-to-Slipper Orientation: Front rolled and bushed eye anchors firmly to the forward chassis hanger for positive axle alignment, while the rear slipper tail expands freely inside the slipper channel.

• Low-Maintenance Mechanical Design: Simple construction with minimal moving parts reduces service points and simplifies routine inspections.

Ideal Applications:

• Light Utility Box Trailers: Running gear for single-axle 5-foot, 6-foot, and 7-foot domestic utility, gardening, and general goods trailers.

• Camping Trailers & Light Caravans: Provides smooth highway and gravel-road damping to cushion camping equipment, rooftop tents, and onboard gear.

• Luggage & Cargo Haulers: Reliable suspension for enclosed luggage trailers, courier trailers, and municipal runabouts.

• Small Boat & Watercraft Trailers: Well-suited for lightweight dinghies, runabouts, and inflatable watercraft haulers.

Product Specifications:

• Product Name: 4 Blade Spring 27"

• Product Category: Suspension / Leaf Springs

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

• Number of Blades: 4 Blades

• Spring Length (Mounting Span): 27 Inches (~685 mm)

• Load Rating: 750 kg per Pair (375 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: Light Trailers, Campers, Caravans, Utility Haulers

• Condition: Brand New Commercial Vehicle Hardware