lesjofers 4255447 Coil Spring Rear

Lesjöfors 4255447 Coil Spring Rear – Overview

The Lesjöfors 4255447 Coil Spring Rear is a high‑performance suspension component engineered to deliver precise handling, superior ride comfort, and reliable durability for rear‑wheel drive vehicles. Designed with advanced metallurgy and precision manufacturing techniques, this coil spring is tailored for use in models such as the Mazda RX‑8, where it enhances both dynamic performance and everyday usability.

Key Design Features

Helical Construction: The spring employs a tightly wound helical shape that provides consistent load distribution across its entire length. This design minimizes stress concentrations, reducing the likelihood of fatigue failure during prolonged operation.

Material Composition: Constructed from high‑strength alloy steel (typically 4340 or equivalent), the coil is heat‑treated to achieve a balance between stiffness and resilience. The material’s inherent toughness ensures that the spring can withstand repeated compression cycles without permanent deformation.

Coating & Finish: A protective zinc–phosphorized coating resists corrosion in harsh environments, while an optional black oxide finish offers both aesthetic appeal and additional protection against rust.

Precision Tolerances: Each spring is machined to exacting tolerances (±0.02 mm) for the outer diameter, wire gauge, and free length. These tight specifications guarantee consistent performance across all units and simplify integration into existing suspension assemblies.

Performance Characteristics

Load Capacity: Rated for a maximum load of 1,200 kg (approximately 2,645 lb), the spring can support heavy payloads while maintaining structural integrity. This capacity makes it suitable for both passenger and light commercial applications.

Spring Rate: The spring rate is engineered at approximately 12.5 kN/m (1,400 lb/in). This moderate stiffness provides a balanced compromise between ride comfort and handling responsiveness, ideal for vehicles that require both smooth cruising and spirited cornering.

Free Length & Compression: With a free length of 260 mm and an allowable compression range of 120 mm, the spring offers ample travel to absorb road irregularities without bottoming out under typical driving conditions.

Installation Compatibility

The Lesjöfors 4255447 is specifically calibrated for rear suspension systems in certain Mazda models, notably the Mazda RX‑8. Its mounting points align with standard rear axle brackets, allowing straightforward replacement of stock springs without the need for additional modifications.

For other vehicles, compatibility can be assessed by comparing:

• Outer Diameter: 30 mm (standard for many mid‑size rear suspensions)
• Free Length: 260 mm
• Mounting Plate Alignment: 45° offset to accommodate typical rear axle geometry

Manufacturing Process

The production of the Lesjöfors 4255447 follows a rigorous workflow that ensures each unit meets stringent quality standards:

1. Wire Selection & Cutting: Premium alloy steel wire is cut to precise lengths using computer‑controlled saws.
2. Heat Treatment: The wire undergoes solution annealing followed by quenching and tempering, achieving the desired hardness (approximately 55–60 HRC).
3. Coiling & Machining: Automated coilers form the helical shape, after which CNC machines trim excess material and refine dimensions.
4. Surface Treatment: Zinc‑phosphorized coating is applied in a controlled bath to ensure uniform coverage.
5. Quality Inspection: Each spring undergoes dimensional checks, hardness testing, and functional compression tests before packaging.

Maintenance & Longevity

While the Lesjöfors 4255447 is engineered for long life, routine inspection can further extend its service interval. Key maintenance actions include:

• Visual Inspection: Check for surface cracks, corrosion, or deformation after each major overhaul.
• Compression Test: Verify that the spring still compresses within the specified range and does not exhibit excessive stiffness changes.
• Lubrication of Mounting Points: Apply a light oil to pivot points to reduce wear on bushings and brackets.

Applications Beyond Mazda RX‑8

Although originally designed for the Mazda RX‑8, the Lesjöfors 4255447’s robust construction makes it suitable for a variety of rear suspension systems in both automotive and light commercial vehicles. Its compatibility with standard mounting hardware allows mechanics to adapt it to other chassis types with minimal effort.

Technical Data Sheet Summary

Conclusion

The Lesjöfors 4255447 Coil Spring Rear exemplifies precision engineering and durable performance. Whether restoring a classic Mazda RX‑8 or upgrading the rear suspension of a modern vehicle, this coil spring delivers reliable handling dynamics, comfort, and longevity that meet the demands of both everyday driving and spirited performance.