Trunnion Shaft: Length Range 200-1500 mm, Hardness 28-32 HRC

Component Specifications

Definition

A trunnion shaft is a critical mechanical component designed as a short, stout cylindrical shaft with precisely machined bearing surfaces at each end. It serves as the central pivot point within a trunnion assembly, allowing rotational movement while supporting substantial radial and axial loads. The shaft typically features mounting provisions (such as keyways, splines, or flanges) for connecting to adjacent components like gears, couplings, or structural members. Its geometry ensures proper alignment and load distribution between stationary and rotating elements in industrial equipment.

Working Principle

The trunnion shaft operates on the principle of rotational kinematics, providing a fixed axis of rotation for connected components. It transfers torque and motion while maintaining structural integrity under combined loading conditions (bending, torsion, and shear). The shaft's bearing surfaces interface with bushings or roller bearings to minimize friction, enabling smooth pivotal movement. Its design ensures precise angular positioning and load-carrying capacity within the mechanical system.

Materials

Typically manufactured from high-strength alloy steels (e.g., AISI 4140, 4340, or EN19) with heat treatment (quenching and tempering) to achieve hardness of 28-32 HRC. Corrosion-resistant variants may use stainless steels (e.g., 17-4PH) or surface treatments like chrome plating or nitriding for enhanced wear resistance.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Hardness	28-32 HRC
Length Range	200-1500 mm
Load Capacity	Up to 50 kN radial, 25 kN axial
Diameter Range	50-300 mm
Surface Finish	Ra 0.8-1.6 μm
Straightness Tolerance	0.05 mm/m

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 748-1, ISO 1101

Parent Products

This component is used in the following industrial products

Pivot Assembly (Trunnion)

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.

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Engineering Analysis

Risks & Mitigation

Shaft fatigue failure under cyclic loading
Bearing surface wear leading to misalignment
Corrosion in harsh environments
Improper installation causing premature failure

FMEA Triads

Trigger: Insufficient lubrication
Failure: Excessive wear on bearing surfaces
Mitigation: Implement automated lubrication systems and regular maintenance schedules

Trigger: Overloading beyond design limits
Failure: Shaft bending or fracture
Mitigation: Install load monitoring sensors and overload protection devices

Trigger: Misalignment during assembly
Failure: Uneven wear and vibration
Mitigation: Use precision alignment tools and follow installation procedures

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Geometric tolerances per ISO 1101, dimensional tolerances per ISO 286-2

Test Method

Non-destructive testing (magnetic particle or ultrasonic), hardness testing per ASTM E18, dimensional verification with CMM

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

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Inspection readiness

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Supplier transparency

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Manufacturers of Trunnion Shaft

Manufacturer profiles associated with Trunnion Shaft.

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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 trunnion shaft?

The trunnion shaft provides a fixed rotational axis for pivotal movement while supporting significant mechanical loads in machinery assemblies.

How do you select the appropriate material for a trunnion shaft?

Material selection depends on load requirements, operating environment, and wear resistance needs. Alloy steels are common for high-strength applications, while stainless steels or coated surfaces are used in corrosive environments.

What maintenance is required for trunnion shafts?

Regular inspection for wear, lubrication of bearing surfaces, and monitoring of alignment and clearance to prevent premature failure and ensure optimal performance.

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.

Trunnion Shaft