Industry-Verified Manufacturing Data (2026)

Eccentric Shaft

Based on aggregated insights from multiple verified 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.

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
    Provides the offset mass to generate the reciprocating motion of the jaw.
    Material: Forged Alloy Steel
  • Bearing Journals
    Precision-machined surfaces for mounting support bearings.
    Material: Hardened Alloy Steel
  • Pulley/Drive Keyway
    Slot for the key that transmits torque from the drive pulley or flywheel.
    Material: Machined Alloy Steel
Engineering Reasoning
0-1200 RPM at 50-200 kN eccentric force
Fatigue failure at 10^7 cycles with 350 MPa alternating stress amplitude
Design Rationale: High-cycle fatigue from cyclic bending stresses exceeding 0.45σ_yield due to offset mass rotation
Risk Mitigation (FMEA)
Trigger Inadequate lubrication causing boundary lubrication regime
Mode: Adhesive wear at journal bearings exceeding 0.1 mm clearance
Strategy: Forced lubrication system with 0.15 MPa minimum pressure and 40°C temperature control
Trigger Material defect exceeding 0.5 mm inclusion size at stress concentration zones
Mode: Crack initiation at fillet radii propagating beyond 2 mm depth
Strategy: Ultrasonic testing at 5 MHz frequency with 0.2 mm defect detection threshold

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Eccentric Shaft.

Applied To / Applications

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

Industrial Ecosystem & Supply Chain DNA

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

Verified manufacturers with capability to produce this product in China

✓ 97% Supplier Capability Match Found

P Project Engineer from Canada Feb 10, 2026
★★★★★
"Great transparency on the Eccentric Shaft components. Essential for our Machinery and Equipment Manufacturing supply chain."
Technical Specifications Verified
S Sourcing Manager from United States Feb 07, 2026
★★★★★
"The Eccentric Shaft we sourced perfectly fits our Machinery and Equipment Manufacturing production line requirements."
Technical Specifications Verified
P Procurement Specialist from United Arab Emirates Feb 04, 2026
★★★★★
"Found 59+ suppliers for Eccentric Shaft on CNFX, but this spec remains the most cost-effective."
Technical Specifications Verified
Verification Protocol

“Feedback is collected from verified sourcing managers during RFQ (Request for Quote) and factory evaluation processes on CNFX. These reports represent historical performance data and technical audit summaries from our B2B manufacturing network.”

12 sourcing managers are analyzing this specification now. Last inquiry for Eccentric Shaft from Thailand (1h ago).

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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.

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