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Fifth Wheel Bush

Heavy Duty Trailer Coupling Component

Fifth Wheel Bush New Model 55mm

Engineered by Amit Rubber Products specifically for prime movers, semi-trailers, and heavy freight haulers. The 55mm Fifth Wheel Bush is moulded from high-resilience synthetic elastomers and natural rubber compounds, delivering reliable vibration dampening, shock absorption during harsh braking cycles, and superior structural fatigue resistance.

Product Classification Fifth Wheel Bushing / Articulation Pivot Damping Bush
Nominal Dimension 55 mm Internal Bore (New Model Specification)
Base Material Options High-Grade NR Rubber / Abrasion-Resistant Polyurethane (PU)
Hardness Rating 70 ± 5 Shore A (Customizable on Request)
Operating Temperature -35°C to +115°C Continuous Service Range
Primary Applications Tractor-Trailer Coupling Assemblies, Semi-Trailers, Haulage Fleets
Engineering Specifications

Engineered for High-Load Articulation & Safety

Understanding the severe stresses encountered in long-haul commercial transport, our 55mm fifth wheel bushings are precision-formulated to maximize fleet reliability and eliminate downtime.

High Tensile & Tear Strength

Formulated with dense elastomeric compounds that withstand high impact loads and sustained pivot forces, preventing premature deformation, cracking, and mechanical play.

Dynamic Vibration Isolation

Absorbs rotational shock and chassis torsion between tractor and trailer, protecting fifth wheel pivot brackets, kingpins, and structural chassis members from micro-fractures.

Environmental & Oil Resistance

Enhanced resistance to chassis lubricants, petrochemical greases, moisture, road debris, and temperature extremes across heavy-duty distribution corridors.

Manufacturing Excellence & Batch Traceability

Since 1980, Amit Rubber Products has adhered to stringent vulcanization standards and mould tolerances. Every batch of fifth wheel bushings undergoes extensive quality verification before international dispatch.

Request Wholesale Price & Drawing Specs
Precision Dimension Verification Critical bore tolerances tested on calibrated callipers and coordinate gauges.
Durometer Consistency Control Uniform Shore A hardness checked across all production lots to prevent uneven wear.
Dynamic Load & Fatigue Testing Moulded compounds audited for cyclic elasticity, tensile recovery, and tear limits.
Frequently Asked Questions

Technical FAQ for Fleet Managers & Importers

What is the critical role of a fifth wheel bush in tractor-trailers?
The fifth wheel bush cushions the pivot point where the trailer kingpin couples to the tractor's fifth wheel plate. It dampens longitudinal shock, absorbs torsion during articulation, reduces chassis stress, and prevents premature metal-on-metal wear between mating brackets.
What material is recommended for fifth wheel bushings: NR rubber or Polyurethane (PU)?
Natural rubber (NR) blends provide superior torsional compliance and vibration insulation for general highway freight. Polyurethane (PU) formulations offer elevated abrasion resistance, higher load-bearing capacity, and resilience against grease or petrochemical exposure on severe heavy-haul routes.
Can Amit Rubber Products customize fifth wheel bushings to custom drawings or OE specs?
Yes. We engineer customized internal diameters, outer dimensions, and Shore A hardness levels according to customer blueprints, OEM part references, or physical samples provided by overseas distributors.

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