Tungsten Heavy Alloy Counterweight Bar (W-Ni-Fe / W-Ni-Cu)

Our Tungsten Heavy Alloy (WHA) Counterweight Bar is a high-density, lead-free precision balancing component engineered from premium W-Ni-Fe and W-Ni-Cu tungsten heavy alloy materials. Manufactured via mature powder metallurgy sintering and ultra-precision finishing processes, this product fully complies with Mil-T-21014 US military specification, ASTM B777-99 / ASTM B777-15 (R2020) and ASTM B459-67 (Type Ⅱ & Ⅲ) industrial standards. Featuring ultra-high density, stable mechanical properties, low thermal expansion and excellent corrosion resistance, it serves as a premium eco-friendly alternative to traditional lead counterweights. Optimized for compact-space gravity calibration, dynamic balance adjustment, vibration stabilization and local radiation shielding, it is widely deployed in aerospace, automotive, medical equipment, precision machinery and industrial drilling industries.

Compared with conventional steel, iron and lead counterweight components, our tungsten heavy alloy counterweight bars deliver 2.3 times higher density than steel and 1.5 times higher density than lead. The superior high-specific-gravity design enables accurate weight configuration in limited installation spaces, effectively optimizes equipment center of gravity, suppresses operational resonance and micro-vibration, and greatly improves equipment running stability and overall service life. Adopting non-toxic alloy formulation, our products fully comply with RoHS and REACH global environmental standards, meeting international industrial upgrading and green manufacturing requirements.

Core Product Advantages tungsten heavy alloy counterweight bar

Adopting optimized tungsten alloy ratio and mature liquid-phase sintering technology, our counterweight bars feature uniform microstructure, consistent density distribution and stable dimensional accuracy in mass production, possessing irreplaceable comprehensive advantages over traditional counterweight materials:

• Ultra-High Density & Space-Saving: Density ranges from 16.85 g/cc to 18.85 g/cc, enabling concentrated weight output in narrow and confined structural spaces. It greatly simplifies mechanical structure design and realizes miniaturization and lightweight optimization of finished equipment.

• Lead-Free & Eco-Friendly: Non-toxic and harmless, fully compliant with RoHS, REACH and global environmental quality standards. It replaces hazardous lead materials, eliminating environmental pollution risks and improving product safety and market compliance.

• Stable Balancing Performance: High specific gravity and excellent mass inertia effectively restrain equipment swing and operational vibration, ensuring high-precision dynamic balance for high-speed rotating and reciprocating mechanical structures.

• Superior Mechanical Stability: High compressive strength, moderate hardness and excellent structural rigidity. No deformation, loosening or weight deviation occurs during long-term high-frequency operation, guaranteeing long-term stable balancing accuracy.

• Excellent Corrosion & Thermal Resistance: Inert chemical properties, strong oxidation resistance and low thermal expansion coefficient. It adapts to complex working environments of high temperature, humidity and chemical corrosion without performance attenuation.

• High Machinability & Customization: Easy to cut, drill, grind and machine. Custom diameters, lengths, tolerance grades and surface treatments are available to match diverse assembly and structural requirements.

• Reliable Radiation Shielding: Superior X-ray and gamma-ray shielding capacity, widely applicable for local radiation protection of medical and industrial equipment.

Product Performance Features

• Precision Gravity Calibration: Uniform density distribution and strict dimensional tolerance ensure accurate weight matching, realizing zero-deviation gravity balance for precision equipment.

• Vibration Suppression & Stability Enhancement: High structural rigidity and mass inertia absorb micro-vibration during equipment operation, improving running smoothness and machining stability.

• Long Service Life: Wear-resistant, deformation-resistant and fatigue-resistant, maintaining stable balancing performance throughout the equipment service cycle with zero frequent replacement.

• Wide Environmental Adaptability: Stable physical and chemical properties, suitable for extreme working conditions such as high temperature, low temperature and high humidity.

• Strict Batch Consistency: Standardized powder metallurgy production ensures identical density, hardness and mechanical properties for each batch, supporting large-scale standardized assembly.

Executive & Testing Standards

Executive Standards: Mil-T-21014 (US Military Tungsten Heavy Alloy Specification), ASTM B777-99 , Chinese GB National Product Quality Standards.
Testing & Verification Standards: Alloy composition testing per ASTM B890-25 (WD-XRF spectrometry); compressive mechanical performance testing per ASTM E9-19 (R2025) / GB/T 7314-2017; density testing per ASTM B311; tensile strength and hardness testing per ASTM E8 / ASTM E18.

Full Alloy Grades & Technical Data

Mil-T-21014 / ASTM B459-67 Grade Mechanical Parameters

ASTM B777-99 Standard Specification (Metric & Imperial Unified)

Accurate Unit Conversion & Core Performance Reference: 114,000 PSI = 114 ksi ≈ 786 MPa. The mainstream 93W-Ni-Fe counterweight bar exhibits excellent compression resistance: 0.2% compressive yield strength of 850–950 MPa (123–138 ksi) and compressive breaking strength of 1600–1800 MPa (232–261 ksi), ensuring ultra-stable structural performance during long-term cyclic balancing operation.

Test Method Explanation

Our tungsten heavy alloy counterweight bars are solid integral structural rods. All compressive mechanical property tests adopt the ASTM E9 / GB/T 7314 standard cylindrical specimen compression method (L/D ratio: 2.5–3.5), the exclusive verification standard for solid tungsten alloy structural parts. The GJB 3793A-2018 ball crush test is only applicable to spherical tungsten pellets and does not apply to this product series. All alloy composition inspection strictly complies with ASTM B890-25 standard specifications to ensure full data traceability.

Application Scenarios

Benefiting from ultra-high density, eco-friendly formulation and stable mechanical balancing performance, our tungsten heavy alloy counterweight bars are widely applied for precision gravity calibration, dynamic balance correction and operational vibration damping in various high-end industrial and precision manufacturing fields:

• Aerospace & Aviation: Aircraft component balancing, gyroscope gravity calibration, aerospace precision structural counterweights

• Automotive & Racing: Vehicle chassis balancing, racing car center-of-gravity optimization, vibration reduction parts

• Precision Machinery & CNC Equipment: High-speed rotating shaft balancing, long-overhang equipment vibration suppression, precision instrument gravity matching

• Medical Equipment: Medical instrument balancing, radiation shielding structural parts, compliant with medical-grade quality standards

• Oil Drilling & Industrial Equipment: Drilling tool weighting rods, downhole equipment counterweights, heavy machinery balancing components

• High-End Electronic & Sports Equipment: Precision electronic component gravity adjustment, professional sports equipment counterweight accessories

Production & Quality Assurance

All tungsten heavy alloy counterweight bars are manufactured through standardized powder metallurgy sintering and high-precision finishing processes, fully compliant with Mil-T-21014 military standards, ASTM B777-99, ASTM B459-67 (Type Ⅱ & Ⅲ) and Chinese GB quality specifications. We implement strict full-process quality management covering raw material screening, sintering parameter monitoring, precision machining and finished product full inspection, ensuring consistent density, dimensional accuracy and mechanical stability for every batch of products.