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Magnetic Mounting for Sensor - Ø25mm Neodymium, 1/4-28 UNF Thread (25kg Pull Force)
Precision Mechanical Mounting Hardware • 3-Year Warranty
BCNT Ø25mm Rare-Earth Neodymium Accelerometer Magnetic Mount – 1/4-28 UNF (25 kg Pull Force | Global Standard Vibration Stud Magnet) (BCNT-MAG-25-1/4-28)
The BCNT-MAG-25-1/4-28 is a high-precision Ø25 mm × 8 mm Rare-Earth Neodymium Accelerometer Magnetic Mount engineered by BCNT Technologies, India's leading vibration sensor hardware manufacturer. Designed in strict compliance with ISO 5348:2021 (Mechanical Mounting of Accelerometers), this mounting magnet delivers an exceptional 25 kg (55 lbs) magnetic pull clamping force to ensure maximum contact stiffness and uncompromised high-frequency vibration signal transmission up to 7.5 kHz.
Engineering Highlights & Physics Principles
- Sintered Neodymium-Iron-Boron (NdFeB Grade N45/N52) Core: Delivers intense magnetic flux density (Br > 1.32 Tesla) providing 25 kg vertical holding force, preventing sensor rocking and micro-chatter under severe machine acceleration.
- Precision CNC Turned 303/304 Stainless Steel Shielding Casing: Directs and concentrates magnetic flux lines into the ferromagnetic machine body while acting as an effective magnetic shield to protect internal piezoelectric shear crystals from EMI noise.
- Optical-Grade Face Flatness (<0.005 mm): Concentric fine lathe finish eliminates air gaps and maximizes acoustic transmissibility across bearing fault frequencies.
- Standardized 1/4-28 Female Thread (Imperial (UNF)): Precision CNC internal tapped thread with 100% thread gauge verification for zero-backlash stud engagement.
- High Mounted System Resonance (> 12.0 kHz): Optimizes mechanical interface stiffness to extend the linear flat measurement bandwidth for high-speed gearbox harmonics and bearing demodulation.
Recommended Predictive Maintenance Applications
- Route-based walkaround vibration surveys on centrifugal pumps, AC induction motors, fans, and cooling towers.
- High-frequency bearing defect analysis (PeakVue, Shock Pulse, Enveloping, Demodulation).
- Turbine, reciprocating compressor, and gearbox diagnostic health monitoring without permanent machine drilling.
- Compatible with leading accelerometer brands (PCB Piezotronics, Wilcoxon, CTC, Hansford Sensors, SKF, Meggitt, IMI).
Pricing & Procurement
3-Year Factory Warranty included on all orders
Technical Specifications
Accelerometer Magnetic Mounts — Complete Size, Thread & Pull Force Matrix (20 SKUs)
Direct access to all 20 individual rare-earth sensor mounting magnets manufactured by BCNT Technologies
| Model Number | Product Name | Body Diameter | Thickness | Mounting Thread | Standard | Action |
|---|---|---|---|---|---|---|
| BCNT-MAG-20-M3 | Magnetic Mounting for Sensor - Ø20mm Neodymium, M3 Thread (18kg Pull Force) | 20 mm | 6 mm | – (Female) | Standard | View SKU → |
| BCNT-MAG-20-M5 | Magnetic Mounting for Sensor - Ø20mm Neodymium, M5 Thread (18kg Pull Force) | 20 mm | 6 mm | – (Female) | Standard | View SKU → |
| BCNT-MAG-20-M6 | Magnetic Mounting for Sensor - Ø20mm Neodymium, M6 Thread (18kg Pull Force) | 20 mm | 6 mm | – (Female) | Standard | View SKU → |
| BCNT-MAG-20-10-32 | Magnetic Mounting for Sensor - Ø20mm Neodymium, 10-32 UNF Thread (18kg Pull Force) | 20 mm | 6 mm | – (Female) | Standard | View SKU → |
| BCNT-MAG-20-1/4-28 | Magnetic Mounting for Sensor - Ø20mm Neodymium, 1/4-28 UNF Thread (18kg Pull Force) | 20 mm | 6 mm | – (Female) | Standard | View SKU → |
| BCNT-MAG-25-M3 | Magnetic Mounting for Sensor - Ø25mm Neodymium, M3 Thread (25kg Pull Force) | 25 mm | 8 mm | – (Female) | Standard | View SKU → |
| BCNT-MAG-25-M5 | Magnetic Mounting for Sensor - Ø25mm Neodymium, M5 Thread (25kg Pull Force) | 25 mm | 8 mm | – (Female) | Standard | View SKU → |
| BCNT-MAG-25-M6 | Magnetic Mounting for Sensor - Ø25mm Neodymium, M6 Thread (25kg Pull Force) | 25 mm | 8 mm | – (Female) | Standard | View SKU → |
| BCNT-MAG-25-10-32 | Magnetic Mounting for Sensor - Ø25mm Neodymium, 10-32 UNF Thread (25kg Pull Force) | 25 mm | 8 mm | – (Female) | Standard | View SKU → |
| BCNT-MAG-25-1/4-28 Viewing | Magnetic Mounting for Sensor - Ø25mm Neodymium, 1/4-28 UNF Thread (25kg Pull Force) | 25 mm | 8 mm | – (Female) | Standard | Current Product |
| BCNT-MAG-30-M5 | Magnetic Mounting for Sensor - Ø30mm Neodymium, M5 Thread (35kg Pull Force) | 30 mm | 8 mm | – (Female) | Standard | View SKU → |
| BCNT-MAG-30-M6 | Magnetic Mounting for Sensor - Ø30mm Neodymium, M6 Thread (35kg Pull Force) | 30 mm | 8 mm | – (Female) | Standard | View SKU → |
| BCNT-MAG-30-M8 | Magnetic Mounting for Sensor - Ø30mm Neodymium, M8 Thread (35kg Pull Force) | 30 mm | 8 mm | – (Female) | Standard | View SKU → |
| BCNT-MAG-30-10-32 | Magnetic Mounting for Sensor - Ø30mm Neodymium, 10-32 UNF Thread (35kg Pull Force) | 30 mm | 8 mm | – (Female) | Standard | View SKU → |
| BCNT-MAG-30-1/4-28 | Magnetic Mounting for Sensor - Ø30mm Neodymium, 1/4-28 UNF Thread (35kg Pull Force) | 30 mm | 8 mm | – (Female) | Standard | View SKU → |
| BCNT-MAG-35-M5 | Magnetic Mounting for Sensor - Ø35mm Neodymium, M5 Thread (50kg Pull Force) | 35 mm | 10 mm | – (Female) | Standard | View SKU → |
| BCNT-MAG-35-M6 | Magnetic Mounting for Sensor - Ø35mm Neodymium, M6 Thread (50kg Pull Force) | 35 mm | 10 mm | – (Female) | Standard | View SKU → |
| BCNT-MAG-35-M8 | Magnetic Mounting for Sensor - Ø35mm Neodymium, M8 Thread (50kg Pull Force) | 35 mm | 10 mm | – (Female) | Standard | View SKU → |
| BCNT-MAG-35-10-32 | Magnetic Mounting for Sensor - Ø35mm Neodymium, 10-32 UNF Thread (50kg Pull Force) | 35 mm | 10 mm | – (Female) | Standard | View SKU → |
| BCNT-MAG-35-1/4-28 | Magnetic Mounting for Sensor - Ø35mm Neodymium, 1/4-28 UNF Thread (50kg Pull Force) | 35 mm | 10 mm | – (Female) | Standard | View SKU → |
| BCNT-MAG-PM-69172 | Neodymium Block Magnet - 20 x 10 x 3mm | – | – | – (Female) | Standard | View SKU → |
| BCNT-MAG-PM-63227 | Neodymium Block Magnet - 50 x 10 x 5mm | – | – | – (Female) | Standard | View SKU → |
| BCNT-MAG-PM-49630 | Neodymium Block Magnet - 20 x 5 x 2mm | – | – | – (Female) | Standard | View SKU → |
| BCNT-MAG-PM-47183 | Neodymium Hook Magnet - Strong Ferrite Pot with heavy duty eyebolt | – | – | – (Female) | Standard | View SKU → |
| BCNT-MAG-PM-35323 | Neodymium Pot Magnet - Ø12mm x 16mm Thick. Pushpin | – | – | – (Female) | Standard | View SKU → |
| BCNT-MAG-PM-35232 | Neodymium Countersunk Magnet - Channel with 2x CSK Hole | – | – | – (Female) | Standard | View SKU → |
| BCNT-MAG-PM-35168 | Neodymium Countersunk Magnet - Channel with CSK Hole | – | – | – (Female) | Standard | View SKU → |
| BCNT-MAG-PM-35124 | Neodymium Hook Magnet - Fishing Pot with 1 Eyebolt Strong Pulling Power | – | – | – (Female) | Standard | View SKU → |
| BCNT-MAG-PM-33590 | Neodymium Disc Magnet - Ø8 x 5mm | – | – | – (Female) | Standard | View SKU → |
| BCNT-MAG-PM-32836 | Neodymium Countersunk Magnet - 25 x 5 M5_CSK | – | – | – (Female) | Standard | View SKU → |
| BCNT-MAG-PM-30806 | Neodymium Hook Magnet - Fishing Pot with 2x Eyebolts Strong Pulling Power | – | – | – (Female) | Standard | View SKU → |
| BCNT-MAG-PM-30399 | Neodymium Magnet - test | – | – | – (Female) | Standard | View SKU → |
| BCNT-MAG-PM-23007 | Neodymium Disc Magnet - Ø25 x 5mm | – | – | – (Female) | Standard | View SKU → |
| BCNT-MAG-PM-16199 | Neodymium Cube Magnet - 10 x 10 x 10mm | – | – | – (Female) | Standard | View SKU → |
| BCNT-MAG-PM-11672 | Neodymium Block Magnet - 40 x 10 x 5mm | – | – | – (Female) | Standard | View SKU → |
| BCNT-MAG-PM-11361 | Neodymium Disc Magnet - 10mm x 5mm N52 | – | – | – (Female) | Standard | View SKU → |
| BCNT-MAG-PM-10265 | Neodymium Disc Magnet - 20mm x 5mm N35EH | – | – | – (Female) | Standard | View SKU → |
| BCNT-MAG-PM-10193 | Neodymium Disc Magnet - Ø12 x 10mm | – | – | – (Female) | Standard | View SKU → |
| BCNT-MAG-PM-7447 | Neodymium Block Magnet - 10 x 3 x 2mm | – | – | – (Female) | Standard | View SKU → |
| BCNT-MAG-PM-7443 | Neodymium Disc Magnet - Ø15 x 3mm | – | – | – (Female) | Standard | View SKU → |
| BCNT-MAG-PM-6814 | Neodymium Cylinder Magnet - 4 x 4mm Strong Cylinder | – | – | – (Female) | Standard | View SKU → |
| BCNT-MAG-PM-6652 | Neodymium Cylinder Magnet - 25mm x 25mm s N52 | – | – | – (Female) | Standard | View SKU → |
| BCNT-MAG-PM-3718 | Neodymium Block Magnet - 20 x 10 x 5mm | – | – | – (Female) | Standard | View SKU → |
| BCNT-MAG-PM-2331 | Neodymium Cylinder Magnet - Ø4 x 2mm | – | – | – (Female) | Standard | View SKU → |
| BCNT-MAG-PM-2227 | Neodymium Block Magnet - 50 x 50 x 25mm s | – | – | – (Female) | Standard | View SKU → |
| BCNT-MAG-PM-2225 | Neodymium Block Magnet - 50 x 50 x 12mm | – | – | – (Female) | Standard | View SKU → |
| BCNT-MAG-PM-1903 | Neodymium Disc Magnet - 8 x 3mm s | – | – | – (Female) | Standard | View SKU → |
| BCNT-MAG-PM-1835 | Neodymium Disc Magnet - 6 x 3mm s | – | – | – (Female) | Standard | View SKU → |
| BCNT-MAG-PM-1479 | Neodymium Cylinder Magnet - 6 x 10mm s | – | – | – (Female) | Standard | View SKU → |
| BCNT-MAG-PM-1413 | Neodymium Disc Magnet - Ø50 x 12mm | – | – | – (Female) | Standard | View SKU → |
| BCNT-MAG-PM-902 | Neodymium Disc Magnet - Ø20 x 2mm | – | – | – (Female) | Standard | View SKU → |
| BCNT-MAG-PM-799 | Neodymium Disc Magnet - Ø13 x 10mm | – | – | – (Female) | Standard | View SKU → |
| BCNT-MAG-PM-686 | Neodymium Block Magnet - 30 x 10 x 5mm | – | – | – (Female) | Standard | View SKU → |
| BCNT-MAG-PM-679 | Neodymium Ring Magnet - OD40 x ID20 x 10mm | – | – | – (Female) | Standard | View SKU → |
| BCNT-MAG-PM-585 | Neodymium Block Magnet - 50 x 25 x 12.50mm s | – | – | – (Female) | Standard | View SKU → |
| BCNT-MAG-PM-269 | Neodymium Cube Magnet - 5 x 5 x 5mm s | – | – | – (Female) | Standard | View SKU → |
| BCNT-MAG-PM-267 | Neodymium Cube Magnet - 10mm x 10mm x 10mm Cube | – | – | – (Female) | Standard | View SKU → |
| BCNT-MAG-PM-244 | Neodymium Disc Magnet - Ø20 x 5mm | – | – | – (Female) | Standard | View SKU → |
| BCNT-MAG-PM-239 | Neodymium Disc Magnet - Ø20 x 3mm | – | – | – (Female) | Standard | View SKU → |
| BCNT-MAG-PM-237 | Neodymium Disc Magnet - Ø15 x 10mm | – | – | – (Female) | Standard | View SKU → |
| BCNT-MAG-PM-217 | Neodymium Disc Magnet - Ø10 x 5mm | – | – | – (Female) | Standard | View SKU → |
| BCNT-MAG-PM-213 | Neodymium Disc Magnet - Ø10 x 1.5mm | – | – | – (Female) | Standard | View SKU → |
| BCNT-MAG-PM-200 | Neodymium Cylinder Magnet - Ø25 x 25mm | – | – | – (Female) | Standard | View SKU → |
| BCNT-MAG-PM-190 | Neodymium Cylinder Magnet - Ø10 x 10mm | – | – | – (Female) | Standard | View SKU → |
| BCNT-MAG-PM-188 | Neodymium Cylinder Magnet - 8 x 10mm s | – | – | – (Female) | Standard | View SKU → |
| BCNT-MAG-PM-183 | Neodymium Block Magnet - 20 x 10 x 2mm | – | – | – (Female) | Standard | View SKU → |
| BCNT-MAG-PM-179 | Neodymium Block Magnet - 40 x 20 x 10mm s | – | – | – (Female) | Standard | View SKU → |
| BCNT-MAG-PM-173 | Neodymium Block Magnet - 25 x 12 x 2mm | – | – | – (Female) | Standard | View SKU → |
| BCNT-MAG-PM-137 | Neodymium Cylinder Magnet - Ø6 x 6mm | – | – | – (Female) | Standard | View SKU → |
| BCNT-MAG-PM-135 | Neodymium Block Magnet - 10 x 10 x 2mm | – | – | – (Female) | Standard | View SKU → |
| BCNT-MAG-PM-28 | Neodymium Disc Magnet - Ø10 x 2mm | – | – | – (Female) | Standard | View SKU → |
Need Custom Sensor Studs, Adhesive Pads or Non-Magnetic Adapters?
BCNT Technologies manufactures custom vibration sensor mounting hardware to exact machinery specifications. We design and machine custom dual-thread mounting studs (M6 to 1/4-28, 10-32 to M5), cementing pads, curved surface adaptors for motor casings, isolated mounting bases, and triaxial mounting cubes with ISO 5348 metrology precision.
Direct manufacturer pricing • All-India fast delivery
The Engineering Behind This Product
Explore the mathematical mechanics, metallurgical choices, resonance dynamics, and signal integrity standards engineered into every BCNT component.
1. Mechanical Resonance & Mounted Bandwidth Dynamics
ISO 5348 §4.2In predictive vibration monitoring, attaching an accelerometer via a magnetic base introduces additional mass and contact compliance, creating a mass-spring system whose natural resonant frequency ($f_n$) governs the upper usable measurement limit:
Where kinterface is the contact stiffness and mbase is the mass of the magnetic mounting base.
To maximize $f_n$ and preserve high-frequency vibration signal fidelity (up to 8 kHz for bearing impact demodulation), BCNT bases optimize the contact stiffness-to-mass ratio through precision CNC surface grinding (<0.005 mm flatness) and high-coercivity rare-earth neodymium cores.
Frequency Response by Mounting Method
| Mounting Technique | Typical Resonance (fn) | Usable Flat Bandwidth (±5%) | Best Use Case |
|---|---|---|---|
| Direct Stud Mount (Reference) | ~32 kHz | 0 – 10.0 kHz | Permanent Critical Machines |
| BCNT Flat Magnet + Silicone Fluid | ~14 kHz | 0 – 8.0 kHz | Route-Based Walkaround PdM |
| BCNT Flat Magnet (Dry Contact) | ~10 kHz | 0 – 5.0 kHz | General Machinery Surveys |
| Curved / Two-Pole Magnet | ~5 kHz | 0 – 2.0 kHz | Rough Motor Casings Only |
2. Magnetic Core & Shielding Metallurgy
Rare-Earth Sintered NdFeB Core (N45/N52 Grade):
Provides intense remanence ($B_r > 1.32 \text{ T}$) ensuring 18 kg to 50 kg vertical clamping pull force. Prevents sensor lift-off during high-G shock impacts.
303 / 304 Stainless Steel Flux Shunt:
Austenitic stainless steel casing directs magnetic flux downward into the machine steel while shielding the accelerometer's internal piezoelectric crystal from stray magnetic fields.
Coupling Fluid Physics:
Applying a micro-thin film of silicone grease or petroleum fluid fills microscopic surface asperities, tripling interface stiffness ($k_{interface}$) and eliminating high-frequency harmonic attenuation.
ISO 5348:2021 Mounting Best Practices
- 1. Angle-Roll Placement: Never drop the magnet straight down. Roll it gently from an edge to avoid shock-overloading the crystal (>5000g acoustic shock).
- 2. Thread Engagement: Thread sensor stud completely into base until flat contact is achieved. Recommended torque: 1.5 to 2.5 Nm.
- 3. Clean Test Target: Clear heavy paint chips, rust scales, and metallic debris before placement.
Detailed Engineering & Procurement Documentation
1. Precision Mechanical Mounting & Metrology Overview
The Magnetic Mounting for Sensor - Ø25mm Neodymium, 1/4-28 UNF Thread (25kg Pull Force) (SKU: BCNT-MAG-25-1/4-28) is an industrial-grade precision accelerometer mounting magnet engineered and CNC-machined by BCNT Engineering in Kerala, India. Specifically developed for vibration analysts, predictive maintenance (PdM) teams, condition monitoring engineers, and NVH test laboratories, this mounting hardware ensures rigid, distortion-free mechanical coupling between industrial machinery and dynamic piezoelectric sensors.
Engineered from precision CNC-machined 303/304 austenitic stainless steel with an internal high-remanence sintered Rare-Earth Neodymium-Iron-Boron (NdFeB Grade N45/N52) core, it provides exceptional clamping pull force to maximize acoustic contact stiffness ($k$) and eliminate high-frequency signal attenuation during route-based walkaround data collection.
2. Comprehensive Engineering Specifications
Detailed mechanical tolerances, thread options, pull force ratings, and ISO 5348 metrology parameters for Magnetic Mounting for Sensor - Ø25mm Neodymium, 1/4-28 UNF Thread (25kg Pull Force):
| Specification Parameter | Technical Value / Compliance |
|---|---|
| Model Number | BCNT-MAG-25-1/4-28 |
| Product Category | Rare-Earth Accelerometer Magnetic Mount |
| Body Diameter | 25 mm |
| Body Thickness | 8 mm |
| Magnetic Core Material | Sintered Rare-Earth Neodymium Iron Boron (NdFeB Grade N45/N52) |
| Magnetic Pull Force | 25 kg (55 lbs / 245 N) |
| Case Metallurgy | Precision CNC Machined 303 / 304 Austenitic Stainless Steel |
| Mounting Thread Interface | 1/4-28 Female (Imperial (UNF)) |
| Thread Engagement Depth | 4.5 mm to 6.0 mm (Blind Tapped) |
| Mounted Resonant Frequency (fn) | > 12.0 kHz |
| Usable Frequency Range | 0 Hz to 7.5 kHz (Flat ±5% with Silicone Fluid) |
| Surface Flatness Tolerance | < 0.005 mm (Concentric Fine Lathe Machined) |
| Operating Temperature Range | -40°C to +120°C (Optional High-Temp SmCo to +180°C) |
| Standard Compliance | ISO 5348:2021 (Mechanical Mounting of Accelerometers) |
| Manufacturing Origin | Engineered & CNC Machined by BCNT Technologies, Kerala, India |
| Warranty | 3 Years Comprehensive Manufacturer Warranty |
3. ISO 5348:2021 Mounted Resonance ($f_n$) & Metrology Dynamics
ISO 5348 §4.2 CompliantIn accordance with ISO 5348 (Mechanical Mounting of Accelerometers), attaching an accelerometer via a magnetic mounting base creates an elastic spring-mass dynamic interface. The natural mounted resonance frequency ($f_n$) governs the upper usable linear flat measurement bandwidth (±5% accuracy limit, typically ~20% to 50% of $f_n$):
Where kinterface is the acoustic contact stiffness and mbase is the magnet mass.
4. Key Industrial Sectors & Machinery Applications
5. Vibration Sensor Mounting FAQs
Direct stud mounting yields the highest natural frequency (~32 kHz), making it ideal for permanent continuous online monitoring. Flat rare-earth neodymium magnetic mounts paired with silicone coupling fluid achieve ~14 kHz resonance and up to 8.0 kHz linear flat response, providing the ideal portable solution for walkaround predictive maintenance surveys without drilling machinery casings.
Select the thread matching your vibration accelerometer's mounting stud. 1/4-28 UNF is the global standard for industrial general-purpose accelerometers (CTC, Wilcoxon, Hansford, PCB, SKF). Metric M6 and M8 are widely used in European/Japanese machinery transmitters. 10-32 UNF is standard for miniature, high-frequency, and triaxial teardrop sensors.
Never allow strong neodymium magnets to snap directly straight down onto steel surfaces, as the metal-to-metal impact can generate acoustic shock exceeding 5,000g, causing signal saturation or shear crystal fracture. Always touch the edge of the magnet to the machine target first, then gently roll the base into place (the ISO 5348 "angle-roll" technique).
Order Direct from BCNT Technologies India
Fast nationwide delivery across Mumbai, Pune, Bengaluru, Chennai, Hyderabad, Delhi NCR, Ahmedabad, and Kolkata with full GST invoicing, calibration certificates, and material test reports.
Frequently Asked Technical & Procurement Questions
Direct answers regarding sensor compatibility, ISO 5348 metrology standards, and nationwide B2B logistics.
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