Product Overview
Threaded pot magnets combine a permanent magnetic core, a precision-machined steel housing, and an integrated threaded mounting structure into a single compact assembly. The steel pot channels and concentrates the magnetic flux toward a single working face, significantly increasing direct holding force while shielding the brittle magnetic material from mechanical impacts and chipping.
Unlike bare block or disc magnets, the integrated threaded feature allows the assembly to be mechanically fastened directly into industrial equipment, fixtures, brackets, and panels without requiring custom adhesive bonding or complex separate holders.
Core Technical Specifications
|
Specification Parameter |
Engineering Options & Standard Ranges |
|
Magnet Material |
NdFeB (Neodymium), Ferrite (Ceramic), SmCo (Samarium Cobalt), AlNiCo |
|
Performance Grades |
NdFeB: N35 to N52 (Standard, M, H, SH, UH thermal stability tiers) |
|
Housing Material |
Low-carbon steel (machined/stamped) / Stainless steel (on request) |
|
Thread Standards |
Metric threads (M3, M4, M5, M6, M8, M10, M12) & Unified Inch threads (UNC/UNF) |
|
Outer Diameters |
Range from compact 10 mm up to heavy-duty 100 mm+ |
|
Magnetization Direction |
Axially magnetized along the central axis of the assembly |
|
Dimensional Tolerances |
Controlled to plus or minus 0.1 mm or stricter per custom drawing agreement |
Typical Industrial Applications
Machine Tooling & Workholding: Securing temporary welding jigs, alignment blocks, and machining fixtures without permanent drilling.
Automation & Robotics: Mounting inductive sensors, cable management channels, and pneumatic component brackets onto structural steel framing.
Enclosures & Access Panels: Fastening removable machine guards, maintenance hatches, and inspection doors.
Signage & Architectural Displays: Hanging heavy-duty commercial display units, retail fixtures, and temporary lighting grids from steel beams.
Material & Environmental Performance Guide
Neodymium (NdFeB): Delivers maximum holding force in minimal space. Best for high-performance automation and precision fixtures. Standard maximum operating temperature is 80 degrees Celsius, with high-coercivity grades available up to 200 degrees Celsius.
Ferrite (Ceramic): Cost-effective solution with inherent corrosion resistance. Requires larger physical dimensions for equivalent pull force. Well-suited for cost-sensitive or high-temperature ambient conditions without demagnetization risks.
Samarium Cobalt (SmCo): Engineered for extreme thermal stability and harsh chemical environments where standard Neodymium loses performance.
AlNiCo: Utilized in specialized applications requiring stable magnetic flux output across wide temperature fluctuations, characterized by high thermal stability and lower coercive force.
Surface Treatments & Corrosion Protection
Because the outer housing is manufactured from carbon steel, proper protective plating is vital for long-term operational reliability:
Ni-Cu-Ni (Nickel Plating): Standard industrial finish providing smooth appearance, wear resistance, and moderate corrosion protection for indoor applications.
Zinc Plating: Cost-effective alternative providing sacrificial corrosion protection for general industrial environments.
Epoxy Coating: Applied for enhanced salt spray resistance and harsh chemical or outdoor exposures.
Rubber Coating: Special elastomer jackets available to prevent scratching on delicate mounting surfaces and significantly increase sliding (shear) friction resistance.
Manufacturing, Quality Control & Traceability
Consistent batch performance relies on strict dimensional and magnetic control across every stage of production:
Component Machining: Turning of steel pot housings to precise outer diameter, depth, and thread-tapping tolerances.
Core Assembly: Accurate press-fitting and bonding of the sintered permanent magnet into the steel cup to ensure uniform air-gap control.
Surface Treatment: Application of specified protective plating to prevent environmental corrosion of the steel housing.
Final Factory Testing: Verification checks covering thread Go/No-Go gauge testing, pull-force bench testing, dimensional coordinate verification, and plating thickness checks.
Custom Manufacturing & OEM Capabilities
For applications requiring non-standard specifications, we support comprehensive OEM/ODM engineering services:
Tailored outer diameters, total assembly heights, and wall thicknesses.
Special thread sizes, custom thread depths, or extended male stud lengths.
Tailored magnetic grades and specialized high-temperature material selection.
Engineering evaluation of customer CAD drawings, mating component specifications, and load constraints prior to pilot production.
FAQ
Q: What is the difference between open-faced pot magnets and countersunk or threaded variants?
A: While open pot magnets require adhesives, clamping, or custom retaining rings to hold them in position, threaded pot magnets feature integrated internal threads or external studs. This allows them to be mechanically bolted, screwed, or stud-mounted directly into structural frames, panels, and machinery without secondary bonding agents or custom hardware brackets.
Q: Can threaded pot magnets be machined, drilled, or tapped after manufacturing?
A: No. Sintered permanent magnetic materials such as Neodymium, Ferrite, and Samarium Cobalt are extremely hard and brittle. They cannot be re-machined, drilled, or re-tapped using standard machine tools. Any necessary thread modifications, custom shell dimensions, or special mounting requirements must be customized during the initial factory manufacturing process based on engineering drawings.
Q: How do temperature changes affect the performance of threaded pot magnets?
A: Thermal exposure impacts permanent magnets differently depending on their material and grade. Standard Neodymium grades begin experiencing reversible and irreversible magnetic loss if exposed to temperatures exceeding 80 degrees Celsius. For high-temperature operating environments, specialized high-coercivity grades (such as H, SH, or UH tiers) or alternative materials like Samarium Cobalt must be selected to maintain stable holding force.
Q: What is the standard packaging and shipping protection for bulk export?
A: Because industrial pot magnets generate intense magnetic fields and have precision-machined steel housings, export packaging must prevent accidental surface scratching, thread damage, and magnetic interference during transit. Components are typically separated with non-magnetic spacers, individually boxed, and lined with magnetic shielding material or air-gap packaging to comply with international air and ocean freight safety standards.
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