Counterweights: Mass Range 0.5 kg to 500 kg

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

Parameter	Typical range	Notes & selection driver
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

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 1940-1, ISO 21940-11, DIN 45665

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.

View Product Details

All-Terrain Crane

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

View Product Details

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

Typical Suppliers & Equivalents

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

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

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Manufacturers of Counterweights

Manufacturer profiles associated with Counterweights.

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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.

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.

Counterweights