Spring seat: Weight Capacity 500-5000 kg, Height 15-60 mm

Component Specifications

Definition

The spring seat is a critical structural component within bolster assemblies of industrial machinery, designed to securely house and position compression or tension springs. It maintains precise spring alignment, prevents lateral displacement under load, distributes mechanical forces evenly across the bolster structure, and isolates vibration transmission between the spring and adjacent components. Engineered with specific geometric tolerances and surface finishes to optimize spring performance and longevity.

Working Principle

The spring seat operates by providing a rigid, precisely machined interface between the spring and bolster structure. It constrains the spring's movement to the intended axial direction, converts spring forces into controlled mechanical motion through its mounting surfaces, and dissipates vibrational energy through material damping properties and geometric design. The seat's contour matches the spring's end coils to prevent stress concentration and ensure uniform load transfer.

Materials

Typically manufactured from medium-carbon steel (AISI 1045/1050), alloy steel (AISI 4140/4340), or ductile iron (65-45-12 grade). Surface treatments include phosphate coating, zinc plating, or black oxide finish for corrosion resistance. Hardness range: 28-35 HRC for steel, 200-250 HB for iron.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Height	15-60 mm
Parallelism	≤0.03 mm
Outer Diameter	50-200 mm
Weight Capacity	500-5000 kg
Surface Flatness	≤0.05 mm
Mounting Hole Pattern	4-8 bolt holes
Operating Temperature	-20°C to 150°C

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 286-2, DIN 2095, ISO 10243

Parent Products

This component is used in the following industrial products

Bolster

A structural component in a rail chassis that connects the truck frame to the car body through the center plate and side bearings.

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Spring Support System

A mechanical support system using springs to isolate and dampen vibrations in vibrating equipment.

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Engineering Analysis

Risks & Mitigation

Fatigue failure under cyclic loading
Corrosion in humid environments
Improper installation causing misalignment
Wear leading to reduced spring performance

FMEA Triads

Trigger: Material fatigue from repeated loading cycles
Failure: Crack propagation leading to structural failure
Mitigation: Use fatigue-resistant alloys, implement regular inspection schedules, apply surface treatments to reduce stress concentrations

Trigger: Corrosive environment exposure
Failure: Material degradation and loss of dimensional accuracy
Mitigation: Apply protective coatings, use corrosion-resistant materials, implement environmental controls

Trigger: Improper installation torque
Failure: Uneven load distribution and premature wear
Mitigation: Use calibrated torque wrenches, follow manufacturer specifications, implement installation training

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Geometric tolerances per ISO 2768-mK, dimensional tolerances H7/h6 for mounting features

Test Method

Dimensional verification with CMM, load testing per ISO 7500-1, fatigue testing per ISO 12106

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

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Manufacturers of Spring seat

Manufacturer profiles associated with Spring seat.

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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 primary function of a spring seat in a bolster assembly?

The spring seat provides precise positioning and stable mounting for springs, ensuring proper force transmission, preventing misalignment, and damping vibrations between the spring and bolster structure.

How do material choices affect spring seat performance?

Material selection determines load capacity, wear resistance, and corrosion protection. Medium-carbon steel offers good strength for general applications, alloy steel provides higher fatigue resistance for heavy loads, while ductile iron offers better vibration damping properties.

What maintenance is required for spring seats?

Regular inspection for surface wear, corrosion, and dimensional accuracy. Lubrication of mounting surfaces may be needed depending on application. Replacement is recommended when wear exceeds 0.1 mm or when corrosion compromises structural integrity.

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.

Spring seat