Structured Manufacturing Data (2026)

Pivot Assembly (Trunnion)

Based on aggregated insights from structured factory profiles within the CNFX directory, the standard Pivot Assembly (Trunnion) used in the Machinery and Equipment Manufacturing sector typically supports operational capacities ranging from standard industrial configurations to heavy-duty production requirements.

Technical Definition & Core Assembly

A canonical Pivot Assembly (Trunnion) is characterized by the integration of Trunnion Shaft and Bearing Housing. In industrial production environments, manufacturers listed on CNFX commonly emphasize Alloy Steel construction to support stable, high-cycle operation across diverse manufacturing scenarios.

A mechanical assembly that provides a rotational pivot point for the hydraulic tilting mechanism, typically consisting of a trunnion shaft mounted within bearings or bushings.

Product Specifications

Technical details and manufacturing context for Pivot Assembly (Trunnion)

Definition
The Pivot Assembly (Trunnion) is a critical component within a Hydraulic Tilting Mechanism. It serves as the central rotational axis, allowing the attached structure (such as a platform, bucket, or implement) to tilt or articulate under hydraulic control. The assembly typically includes a robust trunnion shaft, mounting flanges, and bearing surfaces designed to withstand significant radial and axial loads while ensuring smooth, controlled rotation.
Working Principle
The trunnion shaft is fixed to the stationary frame of the mechanism. The tilting structure is attached to the rotating part of the assembly. Hydraulic cylinders apply force to lever arms connected to the structure, causing it to rotate around the fixed axis of the trunnion. Bearings or bushings within the assembly minimize friction during this pivotal movement.
Common Materials
Alloy Steel, Hardened Steel
Technical Parameters
  • Trunnion shaft diameter and length, bearing bore size, and mounting bolt circle diameter. (mm) Customizable
Components / BOM
  • Trunnion Shaft Part
    Provides the central axis of rotation and transmits loads.
    Material: Hardened Alloy Steel
  • Bearing Housing Part
    Houses the bearings or bushings that support the trunnion shaft.
    Material: Cast Steel or Ductile Iron
  • Mounting Flange Part
    Provides a secure interface for attaching the assembly to the machine frame.
    Material: Steel Plate

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Pivot Assembly (Trunnion).

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Industrial Ecosystem & Supply Chain Structure

Complementary Systems
Downstream Applications
Specialized Tooling

Application Fit & Sizing Matrix

Operational Limits
pressure: Up to 10 MPa (static), 5 MPa (dynamic)
other spec: Max angular velocity: 30 RPM, Max axial load: 50 kN, Max radial load: 100 kN
temperature: -40°C to 120°C
Media Compatibility
✓ Hydraulic oil (ISO VG 32-68) ✓ Water-glycol fluids ✓ Industrial lubricating greases (NLGI 2)
Unsuitable: High-concentration abrasive slurries (>20% solids by weight)
Sizing Data Required
  • Shaft diameter and required torque capacity
  • Maximum angular deflection and oscillation angle
  • Radial and axial load requirements with safety factor

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Bearing seizure
Cause: Inadequate lubrication leading to metal-on-metal contact and overheating
Trunnion wear/ovality
Cause: Excessive radial loads or misalignment causing uneven stress distribution
Maintenance Indicators
  • Unusual grinding or screeching noises during rotation
  • Visible metal particles in lubricant or excessive vibration
Engineering Tips
  • Implement precision laser alignment during installation and periodic re-alignment checks
  • Establish automated lubrication monitoring with temperature and vibration sensors for predictive maintenance

Compliance & Manufacturing Standards

Reference Standards
ISO 9001:2015 - Quality management systems ANSI B18.2.1 - Square and hex bolts and screws DIN 71802 - Trunnion bearings for general engineering
Manufacturing Precision
  • Bore diameter: +/-0.025mm
  • Surface flatness: 0.08mm per 100mm
Quality Inspection
  • Dimensional verification with CMM (Coordinate Measuring Machine)
  • Magnetic particle inspection for surface cracks

Factories Producing Pivot Assembly (Trunnion)

Manufacturer profiles with relevant production capability in China

Manufacturer listings support early research and capability understanding. They are not certification, ranking, or transaction guarantees.

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 materials are used in this Pivot Assembly?

Our Pivot Assembly is constructed from high-grade Alloy Steel and Hardened Steel components, ensuring maximum durability and load-bearing capacity for industrial applications.

What are the main components of this trunnion assembly?

The assembly includes three key components: Bearing Housing for smooth rotation, Mounting Flange for secure installation, and Trunnion Shaft that provides the central pivot point for hydraulic tilting mechanisms.

What types of machinery use this pivot assembly?

This Pivot Assembly is designed for heavy machinery and equipment manufacturing applications, particularly in systems requiring hydraulic tilting or rotational movement such as construction equipment, industrial presses, and material handling systems.

Can I contact factories directly on CNFX?

CNFX is an open directory, not a transaction platform. Each factory profile provides direct contact information and production details to help you initiate direct inquiries with Chinese suppliers.

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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