Structured Manufacturing Data (2026)

Eccentric Shaft

Based on aggregated insights from structured factory profiles within the CNFX directory, the standard Eccentric Shaft 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 Eccentric Shaft is characterized by the integration of Eccentric Section and Bearing Journals. In industrial production environments, manufacturers listed on CNFX commonly emphasize Forged Alloy Steel construction to support stable, high-cycle operation across diverse manufacturing scenarios.

A rotating shaft with an offset center of mass that converts rotary motion into reciprocating motion in a jaw crusher.

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Product Specifications

Technical details and manufacturing context for Eccentric Shaft

Definition
The eccentric shaft is a critical rotating component in a jaw crusher. It is mounted on bearings and features an offset section (eccentric throw) that causes the movable jaw to move in an elliptical path when the shaft rotates. This motion creates the crushing action by repeatedly compressing material against the fixed jaw.
Working Principle
The shaft is driven by a motor via a pulley or gear. As it rotates, the eccentric section causes the connected toggle plate and movable jaw assembly to move back and forth, generating the necessary force to crush rocks and other hard materials fed into the crusher chamber.
Common Materials
Forged Alloy Steel
Technical Parameters
  • Diameter of the main shaft body and the eccentric throw (offset distance). (mm) Standard Spec
Components / BOM
  • Eccentric Section Part
    Provides the offset mass to generate the reciprocating motion of the jaw.
    Material: Forged Alloy Steel
  • Bearing Journals Part
    Precision-machined surfaces for mounting support bearings.
    Material: Hardened Alloy Steel
  • Pulley/Drive Keyway Part
    Slot for the key that transmits torque from the drive pulley or flywheel.
    Material: Machined Alloy Steel

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Eccentric Shaft.

Main Shaft Crusher Shaft jaw crusher eccentric shaft replacement forged steel eccentric shaft specifications eccentric shaft bearing journals maintenance heavy duty eccentric shaft for mining equipment custom eccentric shaft manufacturing machinery

Applied To / Applications

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

Jaw Crusher
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Eccentric Shaft Assembly
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Industrial Ecosystem & Supply Chain Structure

Complementary Systems
Downstream Applications
Specialized Tooling

Application Fit & Sizing Matrix

Operational Limits
pressure: Not applicable (mechanical component)
other spec: Max eccentricity offset: 50 mm, Max rotational speed: 1200 RPM, Max dynamic load: 150 kN
temperature: -20°C to 150°C
Media Compatibility
✓ Forged alloy steel (e.g., 4140) ✓ Case-hardened carbon steel ✓ Stainless steel (316) for corrosive environments
Unsuitable: High-concentration abrasive slurry without proper sealing
Sizing Data Required
  • Required crushing force (kN)
  • Jaw crusher feed opening size (mm)
  • Operating rotational speed (RPM)

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Fatigue cracking
Cause: Cyclic loading from eccentric motion causing stress concentration at fillets or keyways, leading to crack initiation and propagation.
Bearing surface wear
Cause: Inadequate lubrication, contamination, or misalignment causing abrasive wear on bearing journals, leading to increased clearance and vibration.
Maintenance Indicators
  • Excessive vibration or audible knocking during operation
  • Visible cracks or spalling on shaft surfaces, particularly at stress concentration points
Engineering Tips
  • Implement regular vibration analysis and oil analysis to detect early wear and lubrication issues
  • Ensure proper alignment during installation and use protective coatings on bearing surfaces to reduce wear

Compliance & Manufacturing Standards

Reference Standards
ISO 286-2:2010 (Geometrical product specifications - Limits and fits) ANSI B4.1-1967 (Preferred Limits and Fits for Cylindrical Parts) DIN 7184-1 (Eccentric shafts - Part 1: Dimensions)
Manufacturing Precision
  • Eccentricity: +/-0.01mm
  • Surface finish: Ra 0.8μm
Quality Inspection
  • Dimensional verification with CMM (Coordinate Measuring Machine)
  • Magnetic particle inspection for surface defects

Factories Producing Eccentric Shaft

Manufacturer profiles with relevant production capability in China

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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 manufacturing eccentric shafts for jaw crushers?

Our eccentric shafts are manufactured from high-quality forged alloy steel, providing superior strength, durability, and resistance to wear and fatigue in demanding machinery applications.

How does an eccentric shaft convert rotary motion to reciprocating motion in a jaw crusher?

The eccentric shaft's offset center of mass creates an unbalanced rotation that drives the movable jaw in a reciprocating motion, enabling the crushing action against the fixed jaw to process materials.

What maintenance is required for eccentric shafts in heavy machinery?

Regular inspection of bearing journals for wear, lubrication of bearings, monitoring of vibration levels, and checking keyway integrity are essential maintenance practices to ensure optimal performance and longevity.

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 for Machinery and Equipment Manufacturing.

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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