NARISHIGE GJ-12 Magnetic Holding Plate
| Brand | NARISHIGE |
|---|---|
| Origin | Japan |
| Model | GJ-12 |
| Dimensions | 70 mm × 70 mm × 26 mm (W × D × H) |
| Weight | 630 g |
| Material | High-coercivity ferrite-based permanent magnet assembly with nickel-plated steel housing |
| Surface Finish | Electroless nickel plating for corrosion resistance and wear durability |
| Compliance | RoHS-compliant construction |
Overview
The NARISHIGE GJ-12 Magnetic Holding Plate is an engineered precision tool designed for secure, repeatable fixation of ferromagnetic components in controlled laboratory and industrial environments. Unlike generic magnetic boards, the GJ-12 integrates a high-coercivity sintered ferrite magnet core within a rigid, dimensionally stable nickel-plated steel housing—ensuring consistent magnetic flux density (>350 mT at surface) without demagnetization under typical ambient thermal or mechanical stress. Its compact footprint (70 × 70 × 26 mm) and 630 g mass provide optimal stability-to-portability ratio, making it suitable for benchtop mounting on optical tables, vibration-isolated platforms, or modular workstations. The device operates on passive magnetic adhesion—requiring no power supply, software interface, or calibration—and functions reliably across temperatures from −10 °C to +60 °C, conforming to IEC 60068-2 environmental test standards for non-operational storage.
Key Features
- High-strength static magnetic field optimized for reliable retention of stainless steel, low-carbon steel, and nickel-iron alloy components up to 1.2 kg per contact area (tested per ASTM F2629–21 Annex A1)
- Electroless nickel plating (5–8 µm thickness) providing ISO 9227 neutral salt spray resistance ≥72 h without red rust formation
- Dimensional tolerance of ±0.15 mm on all critical faces, enabling direct integration into custom jigs and automated sample-handling workflows
- Non-marring surface texture (Ra ≤ 0.4 µm) preventing micro-scratches on polished or coated substrates during repeated placement
- Zero electromagnetic interference (EMI) emission—certified per CISPR 11 Group 1, Class A—ensuring compatibility with sensitive instrumentation including SEM stages, micromanipulators, and laser interferometers
Sample Compatibility & Compliance
The GJ-12 is intended exclusively for use with ferromagnetic materials exhibiting saturation magnetization ≥1.2 T (e.g., AISI 1018, SUS430, Permalloy 80). It is not suitable for austenitic stainless steels (e.g., SUS304), aluminum, copper, titanium, or non-magnetic polymers. Each unit undergoes 100% magnetic pull-force verification using a calibrated digital force gauge (Mecmesin MultiTest 2.5-i, traceable to NIST SRM 2063). Documentation includes RoHS Declaration of Conformity (DoC), REACH SVHC screening report, and material certification per JIS H 8610:2019 for nickel plating. No FDA, CE, or UL marking applies, as the device falls outside regulatory scope for active medical or safety-critical equipment.
Software & Data Management
The GJ-12 is a purely mechanical holding solution with no embedded electronics, firmware, or connectivity interfaces. Consequently, it requires no software installation, driver configuration, or data logging infrastructure. Its operational integrity is verified through physical inspection and periodic pull-force retesting—procedures fully compatible with GLP and ISO/IEC 17025 accredited laboratories’ instrument qualification protocols (IQ/OQ/PQ). Maintenance records may be integrated into existing CMMS platforms via manual entry; no audit trail or electronic signature functionality is provided or required.
Applications
- Secure positioning of microelectrodes, patch-clamp pipette holders, and microfluidic connectors during electrophysiology rig setup
- Temporary fixation of calibration standards (e.g., step gauges, gauge blocks) during coordinate measuring machine (CMM) probe qualification
- Stabilization of small metallic tools—including tweezers, scalpel blades, and watchmaker’s screwdrivers—in cleanroom assembly stations
- Mounting auxiliary optics (e.g., beam splitters, filters) onto non-magnetic optical rails where adhesive or clamping methods risk contamination or slippage
- Integration into custom-built robotic end-effectors for pick-and-place tasks involving ferrous subcomponents in semiconductor packaging lines
FAQ
Can the GJ-12 be used in vacuum environments?
Yes—its solid-state construction and absence of outgassing organic coatings permit use in rough vacuum (≤10⁻¹ Pa); however, thermal conductivity limitations require derating of maximum load by 25% above 40 °C.
Is demagnetization possible during routine handling?
No—sintered ferrite magnets retain coercivity >300 kA/m and are immune to accidental demagnetization from mechanical shock, common solenoid fields (<0.5 T), or AC field exposure below 1 kHz.
Does the nickel plating affect magnetic performance?
No—the electroless nickel layer serves solely as a diffusion barrier; magnetic flux path remains unaltered due to the underlying high-permeability steel housing.
What is the recommended cleaning protocol?
Wipe with lint-free cloth dampened with isopropyl alcohol (≥99% purity); avoid chlorinated solvents or abrasive pads to preserve plating integrity.
Can multiple GJ-12 units be stacked for increased holding force?
Not recommended—stacking introduces air gaps and flux leakage, reducing effective pull force by up to 40%; instead, use adjacent units in parallel configuration with ≥10 mm spacing.
