NARISHIGE GJ-8 Magnetic Optical Mount
| Brand | NARISHIGE |
|---|---|
| Origin | Japan |
| Model | GJ-8 |
| Pillar Diameter | 14 mm |
| Pillar Length | 175 mm |
| Manipulator Mount Rod Diameter | 12 mm |
| Manipulator Mount Rod Length | 165 mm |
| Magnet Dimensions (W×D×H) | 50 × 80 × 55 mm |
| Total Height | 230 mm |
| Weight | 1.6 kg |
Overview
The NARISHIGE GJ-8 Magnetic Optical Mount is a precision-engineered component designed for stable, repeatable positioning of micromanipulators and optical elements in life science, biophysics, and microscopy laboratories. Built upon the foundational principles of magnetic adhesion and mechanical rigidity, the GJ-8 employs a high-strength permanent magnet assembly to achieve secure attachment to ferromagnetic base plates—commonly designated as “IP iron plates” in NARISHIGE’s ecosystem—without requiring threaded holes, clamps, or adhesive fixtures. Its structural architecture integrates a 14 mm diameter stainless steel pillar (175 mm long) with a coaxial 12 mm manipulator mounting rod (165 mm long), enabling precise axial alignment and minimizing cantilever-induced deflection during fine positional adjustments. The mount’s total height of 230 mm and mass of 1.6 kg provide an optimal inertia-to-footprint ratio, ensuring resistance to micro-vibrations typical in electrophysiology rigs, patch-clamp setups, or laser-based optical trapping systems.
Key Features
- High-reliability neodymium-based magnet assembly (50 × 80 × 55 mm) delivering consistent holding force on standardized IP iron base plates (sold separately)
- Monolithic stainless steel construction with precision-machined interfaces for long-term dimensional stability and corrosion resistance
- Optimized geometry: 14 mm pillar diameter supports high torsional rigidity; 12 mm manipulator rod ensures compatibility with NARISHIGE MO-200, MN-4, and similar ø12 mm shaft manipulators
- No-tools installation and repositioning—enables rapid experimental reconfiguration while maintaining sub-micron positional repeatability
- Compact footprint and balanced center-of-mass minimize resonance coupling in vibration-sensitive environments (e.g., inverted microscope stages or acoustic isolation tables)
Sample Compatibility & Compliance
The GJ-8 is engineered exclusively for use with NARISHIGE’s ø12 mm cylindrical-shaft micromanipulators and compatible optical carriers (e.g., lens holders, mirror mounts with 12 mm bore adapters). It requires a certified IP-series ferromagnetic base plate (e.g., IP-1, IP-2) for full magnetic engagement—these plates conform to JIS G 3101 SS400 material specifications and are routinely validated for static load retention under ISO 9001-certified manufacturing. While the GJ-8 itself carries no CE or FDA designation (as it is a passive mechanical component), its integration into GLP-compliant electrophysiology workstations follows documented instrument qualification protocols per ICH-GCP Annex 11 and USP Analytical Instrument Qualification guidelines.
Software & Data Management
As a purely mechanical mounting solution, the GJ-8 does not incorporate embedded electronics, firmware, or software interfaces. Its performance verification is conducted through physical metrology: positional drift is assessed using calibrated digital calipers (ISO/IEC 17025-accredited) and laser interferometry (traceable to NMIJ/AIST standards) over 24-hour thermal soak cycles (20–25 °C ± 0.5 °C). Laboratory documentation—including mount serial number, base plate lot ID, and adhesion force validation logs—must be retained as part of the instrument history file in accordance with 21 CFR Part 11 requirements when used in regulated bioimaging or preclinical assay workflows.
Applications
- Stable fixation of patch-clamp micromanipulators in whole-cell and single-channel recording configurations
- Alignment support for multi-axis optical tweezers systems requiring minimal thermal drift over extended acquisition periods
- Modular repositioning platform in dual-pipette or triple-electrode setups for intracellular microinjection and voltage-clamp experiments
- Integration with motorized stage controllers (e.g., Prior ProScan III) where magnetic decoupling prevents electromagnetic interference with position feedback signals
- Temporary mounting solution during optical path optimization in confocal, TIRF, or STED microscopy platforms prior to permanent kinematic fixture installation
FAQ
Is the GJ-8 compatible with non-NARISHIGE manipulators?
Yes—provided the manipulator features a 12 mm outer-diameter cylindrical mounting shaft and does not exceed the GJ-8’s maximum recommended moment load of 0.8 N·m at full rod extension.
Can the magnet be replaced or upgraded?
No—the magnet is permanently potted within the aluminum housing and is not user-serviceable; replacement requires factory recalibration and magnetic flux certification.
What surface flatness tolerance is required for reliable magnetic adhesion?
IP iron plates must maintain ≤ 10 µm peak-to-valley flatness across the contact area; deviations exceeding 25 µm may reduce effective holding force by >30% per ASTM F2647-22 Annex A3.
Does the GJ-8 meet cleanroom compatibility standards?
It complies with ISO Class 5 particulate limits when assembled using solvent-cleaned components (IPA followed by nitrogen purge); however, magnet dust shedding is mitigated only through optional NARISHIGE MG-SEAL coating (sold separately).
How often should magnetic adhesion strength be verified?
Per NARISHIGE Technical Bulletin TB-GJ8-REV4, annual verification using a calibrated pull-test gauge (±0.5 N accuracy) is mandatory in GLP/GMP-regulated labs.
