INDUSTRY COMPONENT

Coupling Plate

A critical structural component in fifth wheel couplings that connects the coupling mechanism to the tractor frame, ensuring secure trailer attachment and load transfer.

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Component Specifications

Definition
The coupling plate is a precisely engineered metal plate that serves as the mounting interface between the fifth wheel coupling assembly and the tractor chassis. It distributes vertical, horizontal, and torsional loads from the trailer through the coupling mechanism to the tractor frame, maintaining alignment and structural integrity under dynamic operating conditions. This component must withstand significant shear forces, bending moments, and fatigue stresses while providing a stable foundation for the kingpin engagement system.
Working Principle
The coupling plate functions as a load-transfer interface that converts trailer forces into manageable stresses on the tractor frame. It provides a rigid mounting surface for the fifth wheel assembly while allowing controlled flexure to absorb operational shocks and vibrations. The plate's geometry and bolt pattern ensure proper weight distribution and prevent stress concentration points that could lead to structural failure.
Materials
High-strength low-alloy steel (HSLA) grades such as ASTM A572 or equivalent, typically with yield strength of 345-550 MPa. Heat-treated alloy steels may be used for heavy-duty applications. Surface treatments include hot-dip galvanizing, zinc plating, or powder coating for corrosion resistance.
Technical Parameters
  • Thickness 12-25 mm
  • Bolt Pattern SAE J700 compliant
  • Mounting Holes 8-12 holes (M16-M24)
  • Surface Finish Ra 3.2-6.3 μm
  • Weight Capacity Up to 36,000 kg
Standards
ISO 8717, SAE J700, DIN 74080

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Coupling Plate.

coupling plate fifth wheel component trailer coupling tractor mounting plate automotive structural parts heavy-duty coupling truck components load transfer plate Coupling Plate in Motor Vehicle Manufacturing

Parent Products

This component is used in the following industrial products

Fifth Wheel Coupling

A specialized coupling mechanism that connects a terminal tractor to semi-trailers, allowing articulation and load transfer.

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Engineering Analysis

Risks & Mitigation
  • Fatigue cracking under cyclic loading
  • Corrosion-induced weakening
  • Bolt hole elongation from vibration
  • Improper installation causing stress concentrations
FMEA Triads
Trigger: Material fatigue from repeated loading cycles
Failure: Crack propagation leading to structural failure
Mitigation: Regular non-destructive testing (NDT), proper material selection with adequate fatigue strength, and design optimization to reduce stress concentrations
Trigger: Corrosion due to environmental exposure
Failure: Reduced cross-sectional area and compromised structural integrity
Mitigation: Protective coatings, regular maintenance, and use of corrosion-resistant materials or treatments

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
±0.5 mm for hole positioning, ±0.2 mm for plate flatness
Test Method
Ultrasonic testing for material integrity, dye penetrant inspection for surface cracks, load testing to 150% of rated capacity

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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Frequently Asked Questions

What is the primary function of a coupling plate in fifth wheel systems?

The coupling plate serves as the structural interface that transfers loads from the trailer through the fifth wheel mechanism to the tractor frame, ensuring secure attachment and proper weight distribution.

How often should coupling plates be inspected for wear or damage?

Coupling plates should be visually inspected before each trip and undergo detailed inspection every 6 months or 50,000 km, with particular attention to crack formation, bolt hole deformation, and corrosion.

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.

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