NdFeB Pot Magnets
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NdFeB pot magnets are compact magnetic holding assemblies made by fixing a high-strength neodymium magnet inside a steel cup, shell or mounting base. The steel housing redirects magnetic flux toward the contact face, helping the magnet deliver strong holding force on ferromagnetic surfaces while protecting the brittle NdFeB core from direct impact.
Compared with a bare neodymium magnet, a pot magnet is easier to install, safer to handle and better suited for repeated mounting. Common structures include countersunk pot magnets, threaded-hole pot magnets, male-thread pot magnets, rubber-coated mounting magnets, hook magnets, channel magnets and custom magnetic holding bases.
Ningbo Vanguard Technologies supplies custom NdFeB pot magnets with flexible magnet grades, steel cup designs, mounting threads, countersunk holes, coating systems and pull-force targets. We support magnetic circuit design, machining, assembly, coating, magnetization, pull-force testing and batch inspection for industrial and commercial applications.
Whether your project needs standard holding magnets or a fully customized magnetic base, Vanguard can provide sample production within 10-15 days after drawing, mounting style, coating and pull-force requirement are confirmed.
The following sizes are commonly used in the market for neodymium pot magnets. Pull force values are typical reference data measured on a clean, flat and sufficiently thick steel plate; actual holding force may change with air gap, paint, steel thickness, surface roughness and load direction.
| Model | Pot Diameter | Total Height | Mounting Type | Thread / Hole | Typical Pull Force | Common Use |
|---|---|---|---|---|---|---|
| PM-D10 | 10 mm | 4.5-5 mm | Flat / countersunk | M3 / 3.5 mm hole | 2-4 kg | Small signs, light covers, compact fixtures |
| PM-D12 | 12 mm | 5-6 mm | Countersunk / female thread | M3 / M4 | 4-6 kg | Display hardware, sensor mounts, small brackets |
| PM-D16 | 16 mm | 5-7 mm | Countersunk / male thread | M4 | 8-12 kg | Tool holders, removable panels, light-duty bases |
| PM-D20 | 20 mm | 6-8 mm | Female thread / countersunk | M4 / M5 | 12-18 kg | Machine guards, retail fixtures, sign mounting |
| PM-D25 | 25 mm | 7-9 mm | Male thread / female thread | M5 / M6 | 20-30 kg | Industrial fixtures, hooks, steel-frame mounting |
| PM-D32 | 32 mm | 7-10 mm | Female thread / countersunk | M6 | 35-50 kg | Machine covers, magnetic bases, positioning jigs |
| PM-D36 | 36 mm | 8-11 mm | Male thread / hook type | M6 / M8 | 45-65 kg | Magnetic hooks, hanging hardware, temporary holders |
| PM-D40 | 40 mm | 8-12 mm | Female thread / rubber-coated | M6 / M8 | 60-80 kg | Heavy-duty mounting, coated surface protection |
| PM-D48 | 48 mm | 10-13 mm | Male thread / female thread | M8 | 80-110 kg | Large fixtures, lifting aids, steel structure holding |
| PM-D60 | 60 mm | 12-15 mm | Female thread / rubber-coated | M8 / M10 | 120-180 kg | Heavy magnetic bases, construction and industrial holding |
| PM-D75 | 75 mm | 14-18 mm | Threaded base / custom housing | M10 / M12 | 200-300 kg | High-load fixtures, large steel plate positioning |
| PM-D88 | 88 mm | 16-22 mm | Custom threaded / rubber-coated | M10 / M12 | 300-450 kg | Heavy-duty magnetic bases and custom assemblies |
The following options are commonly used for custom NdFeB pot magnets. Final dimensions, thread size and pull force are confirmed according to drawing, target surface and working environment.
| Item | Available Options | Engineering Notes |
|---|---|---|
| Pot Magnet Type | Flat pot, countersunk pot, internal thread, external thread, hook, rubber-coated, channel magnet | Mounting style is selected according to installation direction, load type and assembly space. |
| Magnet Material | Sintered NdFeB, N35-N52, M/H/SH/UH/EH series | Higher grade increases magnetic output; higher coercivity improves temperature and demagnetization margin. |
| Housing Material | Low-carbon steel cup, stainless steel shell, custom machined steel base | Steel housing improves magnetic circuit efficiency and protects the magnet core. |
| Mounting Feature | M3-M12 thread, countersunk hole, through hole, hook, screw boss, custom insert | Thread engagement, screw torque and load direction should be checked before final design. |
| Surface Protection | NiCuNi, Zn, epoxy, black epoxy, rubber coating, custom plating | Coating is selected by corrosion requirement, surface appearance and contact protection needs. |
| Pull Force Test | Vertical pull force on polished steel plate, custom test fixture available | Actual holding force changes with steel thickness, air gap, paint, surface roughness and load direction. |
| Customization | Diameter, height, thread, hole, housing shape, polarity, packaging and marking | Custom samples can be produced according to 2D/3D drawings and target holding force. |
| Factor | Influence on Holding Force | Recommended Check |
|---|---|---|
| Steel Thickness | Thin steel may saturate and reduce pull force. | Test on the same steel thickness used in the final application. |
| Air Gap | Paint, coating, film or dirt between magnet and steel reduces force quickly. | Confirm force with the real contact gap and surface finish. |
| Load Direction | Sliding or shear load is lower than vertical pull force. | Add mechanical support when vibration or side load is present. |
| Temperature | High temperature can reduce NdFeB output and long-term stability. | Select H, SH, UH or EH grades for elevated-temperature applications. |
| Contact Surface | Curved, rough or painted surfaces reduce effective contact area. | Use rubber-coated, shaped or custom base designs when required. |
Vanguard can customize pot magnet diameter, height, steel housing profile, magnet grade, thread size, countersunk angle, coating, rubber layer, marking and packaging. For applications with limited space, we can optimize the magnetic circuit to balance pull force, cost and installation reliability.
Assembly support: We provide magnet bonding, steel cup pressing, thread machining, coating, magnetization, polarity marking and pull-force testing under one production flow.
Project review: If the application involves vibration, outdoor exposure, painted steel, high temperature or safety-critical load holding, our engineering team can help define a suitable safety factor and validation method.
Production starts with NdFeB magnet grade selection and steel cup machining. The magnet core is coated or protected, bonded or pressed into the housing, then assembled with threaded parts, hooks, rubber layers or countersunk structures according to the approved drawing.
Finished pot magnets are magnetized, pull-force tested, inspected for dimension and appearance, then packed with separators or anti-collision packaging to protect the working face during transport.
Pull-force testing: Vertical pull force can be tested with specified steel plate thickness and surface condition.
Dimensional control: Diameter, height, thread size, countersunk angle, flatness and assembly appearance are inspected per drawing.
Coating verification: Coating thickness, adhesion, salt-spray performance and rubber layer condition are checked according to product type.
Traceability: Material certificate, inspection report, RoHS/REACH declaration and lot records are available for shipment release.
To speed up engineering review, please provide a drawing or confirm the key specifications below. If your project is still at concept stage, Vanguard can help compare standard and custom pot magnet structures before sampling.
