EMC-Safe Non-Magnetic Wire Rope Isolator JGX-2228D-665B Transient Shock Dissipation Mount for Precision Electronics

JGX-2228D-665B EMC-Safe Non-Magnetic Wire Rope Vibration Isolator — Product Overview

The JGX-2228D-665B wire rope vibration isolator is purpose-engineered for applications where electromagnetic compatibility (EMC) and magnetic field cleanliness are critical operational requirements. This model from the JGX-2228 series utilizes 22.2mm diameter stainless steel AISI 304 stranded cable — in its fully annealed, non-magnetic condition — threaded through aluminum alloy 6061-T6 retaining bars to form an 8-loop helical isolation assembly with a 665kg maximum static load rating in compression.

The spring function is created by the elasticity inherent in the flexing of a cable preformed into a helical loop. Each cable loop acts as a non-linear spring element, providing a compliant initial response for vibration isolation that progressively stiffens under increasing load to prevent excessive displacement during shock events. The damping function is the result of relative friction between the cable's individual wire strands. The 7*19 strand construction creates hundreds of inter-wire contact points where Coulomb friction converts dynamic mechanical energy into distributed low-grade thermal dissipation — a purely passive, maintenance-free energy management mechanism.

The cables, which are made of stainless steel AISI 304 in the annealed condition, exhibit superb water-proof characteristics, exceptional corrosion resistance, and steady, predictable mechanical performance. With their corrosion resistant, all-metal construction, Xi'an Hoan's wire rope vibration isolators are environmentally stable, high-performance devices that are unaffected by temperature extremes, chemicals, oils, ozone, UV radiation, and abrasive media.

EMC-Safe & Non-Magnetic Design — Zero Electromagnetic Footprint

Conventional vibration isolators frequently incorporate ferrous alloys, magnetic stainless steel grades, or embedded steel components that can distort local magnetic fields, generate eddy currents in time-varying fields, or introduce passive intermodulation (PIM) distortion in RF environments. The JGX-2228D-665B eliminates these risks through deliberate, application-driven material selection:

• Non-Magnetic Cable Material: The AISI 304 stainless steel cable is supplied in the fully annealed condition with magnetic permeability (μr) verified below 1.02. At this level, the material is classified as non-magnetic and produces no measurable distortion in diagnostic magnetic fields, including those used in MRI suites (1.5T-7T), electron microscopy, and precision magnetometer installations.
• Non-Magnetic Bar Material: Aluminum alloy 6061-T6 is inherently non-magnetic with permeability effectively equal to 1.0 (identical to free space). No ferrous content, no induced magnetization, and no residual magnetic signature after exposure to strong external fields.
• Passive Device — Zero Emissions: The JGX-2228D-665B contains absolutely no electronic components, no motors, no sensors, and no active elements of any kind. It neither generates nor radiates electromagnetic interference across any frequency band. Unlike active vibration cancellation systems, it requires no power supply, no controller, no feedback loop, and produces no switching noise or harmonic emissions.
• No Ground Loop Formation: When specified with hard anodized aluminum bars (which form an electrically insulating aluminum oxide surface layer) and optional non-conductive bushing inserts, the JGX-2228D-665B provides complete galvanic isolation between the isolated equipment and its mounting structure. This prevents the formation of ground loops that are a common source of 50/60Hz hum and noise in sensitive measurement systems.
• RF-Transparent: The all-metal construction uses non-ferrous materials that do not interact with radio frequency fields. The open helical geometry of the cable loops also minimizes any potential for unintended RF reflection or cavity resonance effects that can occur with solid metal structures in antenna near-fields.

Transient Shock Wave Dissipation Technology

One of the most challenging scenarios in vibration isolation is the management of transient shock pulses — short-duration, high-amplitude mechanical impulses that can overwhelm conventional dampers before they have time to respond. The JGX-2228D-665B addresses this through an inherent multi-stage shock energy dissipation cascade that activates within microseconds of wavefront arrival:

• Wavefront Impedance Mismatch: A shock pulse traveling through the mounting structure encounters the cable loop geometry as an abrupt mechanical impedance change. The curved, multi-strand cable presents a complex boundary that causes partial reflection and mode conversion of the incoming stress wave — compression mode converts to shear, shear converts to flexural, and each mode conversion reduces the energy transmitted to the isolated payload.
• Multi-Path Propagation Scattering: Within the 7*19 cable strand bundle, the shock wavefront splits into multiple propagation paths as it travels through individual wire strands. Differences in path length between outer and inner strands cause temporal dispersion — the sharp, high-amplitude pulse spreads into a lower-amplitude, longer-duration waveform that is far less damaging to sensitive equipment.
• Inter-Strand Coulomb Friction Damping: As individual wire strands undergo relative micro-motion during shock-induced deflection, friction at every inter-strand contact interface converts kinetic energy to heat. This mechanism is instantaneous, requires no viscous fluid, and scales naturally with input amplitude — larger shocks engage more contact points and produce proportionally greater energy dissipation.
• Non-Linear Stiffness Hardening: As the cable loops deflect into the higher-stiffness region of their non-linear spring characteristic, the increasing resistance limits maximum travel and prevents mechanical bottoming. The transition from the low-rate isolation zone to the high-rate protection zone occurs progressively, without the sudden force discontinuity characteristic of mechanical snubbers.
• Omnidirectional Protection: The 8-loop helical configuration provides simultaneous energy dissipation in compression, shear, and roll axes. Regardless of the shock pulse direction of arrival, multiple cable loops are optimally oriented to intercept and dissipate the incoming energy, providing true multi-axis transient protection in a single passive device.

Technical Specifications

Mounting Bars — Material Selection & Surface Treatment

Material of Mounting Bars: Stainless Steel or Aluminum can be selected. Aluminum alloy 6061-T6 is the standard recommendation for EMC-sensitive applications due to its inherently non-magnetic properties (μr = 1.0) and the electrical insulation provided by the hard anodized surface layer. Stainless steel 304 in the annealed condition is available as an option for highly corrosive environments where the additional strength of steel is required — note that annealed 304 maintains non-magnetic classification (μr < 1.02).

Surface Treatment Selection of Aluminum Mounting Bars:

• White Anodizing: The surface treatment to make the aluminum surface harder than itself. The color of the white anodized aluminum mounting bars keeps the same color as the aluminum itself. It is the normal surface treatment of the aluminum mounting bars, suitable for general indoor applications. Note: white anodized surfaces may retain some electrical conductivity.
• Hard Anodizing: The surface treatment to make the aluminum mounting bars much harder than the white anodized way. The color of the hard anodized aluminum mounting bars is darker than the white anodizing method. The thicker oxide layer provides effective electrical insulation between the mounting bar and the equipment chassis, preventing ground loop formation. Special use for complex or special requirements of the working conditions of wire rope isolators including EMC-sensitive installations, outdoor exposure, and high-wear applications.

Key Characteristics of Xi'an Hoan's Vibration Isolators

• No creep or ageing — consistent mechanical properties throughout multi-decade service life
• High internal damping — inter-strand Coulomb friction provides amplitude-dependent energy dissipation without fluids or elastomers
• Very wide temperature range — reliable operation from -40°C to +120°C without performance drift
• Wide variety of possible fittings — multiple bar materials, surface treatments, bushing options, and mounting configurations
• Rapid and economical prototyping — custom EMC-validated configurations available with short lead times
• Extremely rugged construction and long lifespan — all-metal design withstands physical abuse and harsh environments
• Excellent combined shock and vibration isolation — single device handles chronic vibration and acute transient shock
• Not affected by chemical agents, seawater, ozone, UV rays — suitable for the most demanding operating environments
• EMC-safe passive design — zero electromagnetic emissions, zero magnetic signature, zero power requirement
• Non-magnetic materials throughout — compatible with MRI, magnetometer, and electron microscopy environments
• Transient shock wave dissipation — multi-path energy cascade provides microsecond-response shock protection
• Maintenance-free operation — no lubrication, no adjustment, no scheduled service of any kind

Application Areas — EMC-Safe Vibration Isolation

Frequently Asked Questions — JGX-2228D-665B EMC-Safe Isolator

Q: Is the JGX-2228D-665B truly non-magnetic? Can it be used near an MRI scanner?
A: Yes. Both the AISI 304 stainless steel cable (annealed condition, μr < 1.02) and the aluminum alloy 6061-T6 bars (μr = 1.0) are classified as non-magnetic materials. The isolator produces no measurable magnetic field distortion and has been specified for ancillary equipment installations in MRI suite equipment rooms. We provide material certifications documenting magnetic permeability upon request.

Q: How does transient shock wave dissipation differ from regular vibration damping?
A: Regular vibration damping addresses continuous, lower-amplitude oscillation. Transient shock dissipation targets short-duration, high-intensity mechanical impulses. The JGX-2228D-665B handles both through different mechanisms: the cable loop elasticity isolates steady-state vibration, while the multi-path inter-strand Coulomb friction cascade dissipates shock energy within microseconds of wavefront arrival. The non-linear stiffness curve provides progressively increasing resistance that prevents bottoming under shock without sacrificing isolation at normal vibration levels.

Q: Does the JGX-2228D-665B require electrical grounding or shielding?
A: No. The JGX-2228D-665B is a completely passive mechanical device. It requires no electrical power, no grounding connection, and no shielding. The hard anodized surface treatment on the aluminum bars actually provides electrical insulation between the equipment and the mounting surface, preventing ground loop formation — a common source of noise in sensitive measurement systems.

Q: Can the JGX-2228D-665B be customized for specific EMC requirements?
A: Yes. Our engineering team can configure the bar material, surface treatment, bushing material, and mounting hole pattern to meet your specific EMC, magnetic cleanliness, and mechanical requirements. We regularly supply custom configurations for medical imaging OEMs, semiconductor equipment manufacturers, and scientific instrument builders. Contact us with your specifications for a technical consultation.

Q: What documentation is available for EMC/MRI compliance verification?
A: We provide material certificates to EN 10204 3.1 including magnetic permeability test data, ISO 9001:2015 quality system certification, RoHS compliance documentation, and CE marking where applicable. Custom test reports for specific material properties can be arranged for OEM qualification programs.

Company Information — Xi'an Hoan Microwave Co., Ltd.

Xi'an Hoan Microwave Co., Ltd. is the professional manufacturer of vibration isolators and mounts, providing top quality energy absorption and vibration isolation solutions to a variety of commercial, industrial, and heavy industry sectors.

Our products cover a wide range, including wire rope vibration isolators, elastomeric shock mounts, friction dampers, and shock absorbers, as well as LC filters and microwave communication components. Established in 2005, with fast development over two decades, we have grown to more than 500 employees including over 100 engineering and technical experts. The company is headquartered in Xi'an High-tech Zone, Shaanxi, China, operating 800 square meters of dedicated production and R&D facilities.

Now, we serve customers across more than 31 provinces in China and almost 25 overseas countries, providing vibration isolation solutions for motor drives, fan systems, punch machines, elevators, compressors, chemical processing equipment, railway and subway systems, bridge engineering, mechanical equipment, large-scale construction, recording studios, theaters, vehicles, vessels, and industrial machinery of all types.

Contact us today to see how our products can benefit your specific equipment application needs, or alternatively you may find one of our many representatives to help you meet your product requirements. We specialize in application-specific isolation design with particular expertise in EMC-compatible and magnetically-clean installations for medical, scientific, and telecommunications environments.

Certifications & Quality Assurance

• ISO 9001:2015 Quality Management System — Certified
• RoHS Directive 2011/65/EU — Compliant
• Material Certificates to EN 10204 3.1 — Available (Including Magnetic Permeability Data)
• CE Marking — Available Upon Request
• Custom EMC/MRI Compatibility Documentation — Available for OEM Qualification