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Side frame Component – Other Transport Equipment Manufacturing

Component Specifications

Definition

The side frame is a longitudinal structural member of a bogie frame assembly in railway rolling stock, designed to connect the axle boxes, support the vehicle body through the bolster, and distribute vertical, lateral, and longitudinal forces. It typically features a box-section or I-beam design with precisely machined interfaces for suspension components, brake rigging, and other bogie elements.

Working Principle

The side frame functions as a rigid beam that transfers loads from the vehicle body through the bolster to the axle boxes and wheelsets. It maintains proper wheel alignment, absorbs dynamic forces during operation, and provides mounting points for secondary suspension systems and braking components.

Materials

High-strength low-alloy steel (HSLA) grades such as ASTM A572 Grade 50 or EN 10025 S355J2, with yield strength ≥355 MPa, impact toughness requirements at -20°C, and controlled carbon equivalent for weldability.

Technical Parameters

Width 150-250 mm
Height 300-450 mm
Length 1800-2500 mm
Weight 150-300 kg
Weld Quality Full penetration welds, UT tested
Load Capacity 15-25 tons per side
Surface Finish SA 2.5 blasted, primer coated

Standards

ISO 1005, DIN 4322, AAR M-202

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Side frame.

Parent Products

This component is used in the following industrial products

Bogie frame

The primary structural component of a bogie that supports the vehicle body and connects to the wheelsets.

View Product Details

Engineering Analysis

Risks & Mitigation

Fatigue cracking at stress concentration points
Corrosion in harsh environments
Weld failure under dynamic loading
Dimensional wear affecting wheel alignment

FMEA Triads

Trigger: Stress concentration at sharp corners or weld transitions
Failure: Fatigue crack propagation leading to structural failure
Mitigation: Implement radiused transitions, shot peening for compressive stresses, regular NDT inspections

Trigger: Inadequate corrosion protection
Failure: Section loss reducing load capacity
Mitigation: Apply multi-layer coating systems, specify corrosion-resistant steel grades, implement regular maintenance inspections

Trigger: Improper heat treatment during manufacturing
Failure: Brittle fracture or reduced fatigue life
Mitigation: Strict process control, mechanical property verification, Charpy impact testing

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance

±1.0 mm on critical bore diameters, ±2.0 mm on overall dimensions, flatness within 1.5 mm/m

Test Method

Static load testing to 1.5x design load, fatigue testing per ISO 12107, hardness testing, chemical analysis, dimensional verification

Procurement Evaluation Criteria

Not customer reviews or live demand data. These dimensions support RFQ preparation and supplier evaluation.

Technical documentation

4/5

Manufacturing capability

4/5

Inspection readiness

5/5

Supplier transparency

3/5

These scores are example evaluation dimensions, not real customer ratings, country-specific buyer feedback, or live inquiry activity.

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Secondary Seal

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Center Sill

The center sill is the primary longitudinal structural beam in a rail chassis that supports vertical loads and distributes forces throughout the railcar frame.

Frequently Asked Questions

What is the primary function of a side frame in a bogie?

The side frame primarily provides structural integrity to the bogie assembly, distributing loads between the vehicle body and wheelsets while maintaining proper wheel alignment and supporting suspension components.

How are side frames inspected for defects?

Side frames undergo non-destructive testing including magnetic particle inspection for surface cracks, ultrasonic testing for internal flaws, dimensional verification of critical interfaces, and visual inspection for corrosion or damage.

Can side frames be repaired or must they be replaced when damaged?

Minor repairs following approved welding procedures are possible for certain defects, but significant cracks, deformation, or wear beyond specified limits typically require replacement to maintain structural integrity and safety.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

Data Basis

CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks.

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.

Side frame