Graduated Leaves: Width Range 50-100 mm

Component Specifications

Definition

Graduated leaves are individual steel plates in a multi-leaf spring assembly that vary in length and thickness, creating a progressive spring rate. They are arranged in a stack with the longest and thickest leaf (master leaf) at the bottom and progressively shorter, thinner leaves above. This design allows the spring to handle light loads with fewer leaves engaged and heavier loads with more leaves, providing variable stiffness and improved ride comfort.

Working Principle

Graduated leaves work on the principle of progressive spring action. Under light loads, only the longer, thinner leaves flex, providing a softer spring rate for comfort. As load increases, shorter, thicker leaves come into contact and engage, increasing the spring rate and load-bearing capacity. This creates a non-linear force-deflection curve that adapts to varying load conditions.

Materials

High-carbon spring steel (SAE 5160, 6150), alloy steel (51CrV4), or micro-alloyed steels with carbon content 0.50-0.75%. Heat treated to Rockwell hardness 45-52 HRC. Surface treatments include shot peening and paint/coating for corrosion resistance.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Spring Rate	Progressive: 50-200 N/mm
Width Range	50-100 mm
Length Range	500-2000 mm
Load Capacity	500-5000 kg per spring assembly
Thickness Range	6-12 mm
Number Of Leaves	3-12 leaves per spring

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

ISO 18137, DIN 2093, SAE J510

Parent Products

This component is used in the following industrial products

Spring System (Leaf Springs)

A leaf spring assembly that provides controlled vibration and support in vibratory feeding systems.

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Engineering Analysis

Risks & Mitigation

Fatigue failure from cyclic loading
Corrosion in harsh environments
Leaf separation under extreme loads
Noise from inter-leaf friction

FMEA Triads

Trigger: Inadequate heat treatment
Failure: Premature fatigue cracking
Mitigation: Implement strict tempering process controls and hardness testing

Trigger: Poor inter-leaf contact
Failure: Uneven load distribution and premature failure
Mitigation: Precision grinding of contact surfaces and proper assembly torque

Trigger: Insufficient corrosion protection
Failure: Reduced cross-section and strength loss
Mitigation: Apply multi-layer coatings and regular maintenance inspections

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Length: ±2 mm, Thickness: ±0.2 mm, Camber: ±3 mm, Flatness: 1 mm/m

Test Method

ISO 18137: Fatigue testing under cyclic loading, DIN 2093: Static load testing, SAE J510: Performance validation

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

Check the legal entity, factory address, ownership, certifications, and direct contacts.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Manufacturers of Graduated Leaves

Manufacturer profiles associated with Graduated Leaves.

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Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review

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Frequently Asked Questions

What is the advantage of graduated leaves over uniform leaves?

Graduated leaves provide progressive spring rates - softer for light loads and stiffer for heavy loads - improving both ride comfort and load capacity compared to uniform leaves with constant spring rates.

How are graduated leaves manufactured?

They are hot-formed from spring steel, heat treated for strength, shot peened for fatigue resistance, and often coated with anti-corrosion treatments. Precision grinding ensures proper contact surfaces between leaves.

What vehicles use graduated leaf springs?

Primarily commercial vehicles - trucks, buses, trailers, and some heavy-duty SUVs where variable load conditions require progressive spring characteristics.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Graduated Leaves