INDUSTRY COMPONENT

Counterweights

Counterweights are precision-engineered components that balance rotating systems by offsetting eccentric masses to minimize vibration and ensure smooth operation.

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Component Specifications

Definition
Counterweights are mass elements strategically attached to rotating shafts, particularly eccentric shafts or cranks, to counteract unbalanced forces caused by off-center masses. They are engineered to achieve dynamic balance by creating an opposing centrifugal force that neutralizes vibrations, reduces bearing loads, and prevents premature mechanical failure. In industrial machinery, they are critical for maintaining operational stability, reducing noise, and extending equipment lifespan.
Working Principle
Counterweights operate on the principle of static and dynamic balancing. By adding mass at specific radial positions opposite to the eccentric load, they generate a centrifugal force equal in magnitude but opposite in direction to the force produced by the unbalanced mass. This cancels out net vibrational forces and moments, ensuring the system's center of mass aligns with the axis of rotation for smooth, vibration-free operation.
Materials
Typically made from high-density materials such as cast iron, steel alloys (e.g., AISI 1045, 4140), or tungsten alloys for compact designs. Materials are selected based on required density, corrosion resistance, machinability, and cost-effectiveness.
Technical Parameters
  • Tolerance ±0.5% of specified mass
  • Mass Range 0.5 kg to 500 kg
  • Mounting Type Bolted, welded, or clamped
  • Surface Finish Ra 3.2 μm or better
  • Operating Temperature -20°C to 150°C
Standards
ISO 1940-1, ISO 21940-11, DIN 45665

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Counterweights.

counterweights eccentric shaft balancing crank balancing vibration reduction dynamic balancing industrial machinery components mechanical counterweights rotating equipment Counterweights in Machinery and Equipment Manufacturing

Parent Products

This component is used in the following industrial products

Eccentric Shaft / Crank

A mechanical component that converts rotary motion into oscillating or reciprocating motion through its offset axis of rotation.

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All-Terrain Crane

A mobile crane designed to operate on both paved roads and rough off-road terrain with superior mobility and lifting capabilities.

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Engineering Analysis

Risks & Mitigation
  • Improper balancing causing excessive vibration
  • Material fatigue from cyclic loading
  • Corrosion in harsh environments
  • Loosening of mounting hardware
FMEA Triads
Trigger: Incorrect mass calculation or installation
Failure: Persistent vibration leading to bearing failure
Mitigation: Use calibrated balancing equipment and follow ISO 1940 standards during installation
Trigger: Corrosion or material degradation
Failure: Reduced mass integrity and imbalance
Mitigation: Apply protective coatings and use corrosion-resistant materials

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
Balance quality grade G6.3 per ISO 1940-1 for general industrial machinery
Test Method
Dynamic balancing testing using balancing machines, with verification per ISO 21940-11

Procurement Evaluation Criteria

Not customer reviews or live demand data. These dimensions support RFQ preparation and supplier evaluation.

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

Why are counterweights necessary in eccentric shafts?

Counterweights are essential to balance the uneven mass distribution caused by the offset design of eccentric shafts, preventing excessive vibrations that can lead to bearing wear, structural fatigue, and operational inefficiency.

How are counterweights designed for specific applications?

Design involves calculating the required mass and position based on the eccentric mass, rotational speed, and desired balance quality per standards like ISO 1940, often using CAD and simulation tools for precision.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

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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Counterweight Mounting Structure Counting Circuit