OSENC manufactures custom nickel coated and nickel plated neodymium magnets with an NdFeB + Ni + Cu + Ni structure, controlled plating thickness, finished dimensions, magnet grade, magnetization and geometry to your drawing. Our standard total Ni-Cu-Ni thickness is 15–21 μm, with ±0.10 mm as the standard finished tolerance and ±0.05 mm available for approved precision geometries.
OSENC uses the stack NdFeB + Ni + Cu + Ni. The first nickel layer supports bonding and protection, copper forms the middle barrier, and the outer nickel layer provides the final smooth silver / semi-bright metallic surface. We control total Ni-Cu-Ni thickness on the product specification and define individual layer data only when the process documentation requires it.
| Item | OSENC Specification | Purchasing Meaning |
|---|---|---|
| Structure | NdFeB + Ni + Cu + Ni | Multilayer metallic protection for sintered NdFeB. |
| Total Thickness | 15–21 μm standard total Ni-Cu-Ni thickness | Other Ni-Cu-Ni builds are manufactured only when the project specification defines the required coating thickness and inspection method. |
| Standard Finish | Smooth silver / semi-bright silver metallic finish | Bright mirror, satin or matte require a separate finish specification. |
| Finished Tolerance | ±0.10 mm standard / ±0.05 mm precision | Applied to suitable plating-finished geometries. |
| Corrosion Positioning | Indoor / controlled humidity / normal industrial handling | More aggressive environments move to another protection system. |
Nickel plating for magnets is used when the project needs a thin metallic protection system, a smooth finished surface and controlled coating build around the NdFeB core. OSENC specifies the complete Ni-Cu-Ni stack together with finished dimensions and application exposure instead of treating the coating as a cosmetic add-on.
The Ni-Cu-Ni system adds a controlled metallic layer around the machined NdFeB geometry, which matters when the finished magnet must fit a defined assembly space.
The outer nickel layer provides the smooth silver / semi-bright metallic finish used for visible parts, fixtures and general OEM assemblies.
OSENC positions standard Ni-Cu-Ni for indoor, controlled-humidity and normal industrial handling conditions.
Permanent immersion, seawater, continuous salt exposure and aggressive chemicals move the project to a stronger application-specific protection system.
A nickel plated neodymium magnet is not just a bare magnet with a silver surface. The NdFeB core, machining route, coating build, finished dimensions, magnetization and final inspection all have to work as one finished part.
| Control Point | What OSENC Controls | Why It Matters to the Buyer |
|---|---|---|
| NdFeB Core | Grade and required magnetic performance. | Sets the magnetic and temperature basis of the finished magnet. |
| Machining | Geometry, holes, countersinks, critical datums and plating allowance. | Controls fit before the coating build is added. |
| Ni-Cu-Ni Plating | Plating stack, total thickness and required surface condition. | Defines the finished protective layer and dimensional build. |
| Finished Dimensions | Critical dimensions after plating against the approved drawing. | Prevents coating build from breaking the required assembly fit. |
| Magnetization | Direction, pole layout and required magnetic verification. | Matches the finished magnet to the intended magnetic circuit. |
| Final Inspection | Surface condition, dimensions, magnetic requirement and packaging protection. | Locks the shipped part to the approved finished-part requirement. |
We treat coating, magnetic performance and finished dimensions as one manufactured part, so the quotation reflects the real assembly requirement rather than a generic nickel finish.
OSENC manufactures nickel coated disc, cylinder, block, ring and countersunk magnets across micro, standard and large custom ranges. The final drawing controls plating access, edge condition, hole geometry, tolerance and magnetization.
| Shape | Capability |
|---|---|
| Disc / Cylinder | Micro, standard and larger custom diameters and thicknesses are reviewed to drawing; publishable range limits are tied to verified production records. |
| Block | Custom length, width and thickness combinations are manufactured to drawing, with large or thin-section parts reviewed for machining, plating and handling risk. |
| Ring | OD, ID and thickness are drawing-controlled; thin walls, large diameters and tight concentricity requirements are reviewed before quotation. |
| Countersunk | Disc / block body envelope with hole diameter, major diameter, angle, position and remaining edge material defined separately. |
Micro and tight-tolerance Ni-Cu-Ni parts are reviewed as project-specific precision work. The drawing must define finished dimensions after plating, critical datums and the inspection method so machining tolerance and coating build are evaluated together.
OSENC Ni-Cu-Ni projects commonly use N35–N52 plus H, SH, UH and EH grade families. Grades outside the published range are handled against the project material specification and required magnetic performance. We select the grade from required magnetic output, coercivity, geometry and operating temperature.
OSENC supports axial, diametrical, radial, multipole and custom magnetization. Disc / ring / cylinder parts can use axial or diametrical directions, while blocks can be magnetized through thickness, length or width.
Use this as the first coating-selection screen. The final protection system still follows the actual exposure, geometry, assembly method and inspection requirement.
| Application Requirement | Ni-Cu-Ni Fit | OSENC Position |
|---|---|---|
| Indoor OEM assembly | Strong fit | Standard use case for a smooth metallic protective finish. |
| Controlled humidity | Strong fit | Suitable when exposure stays within the defined normal industrial environment. |
| Compact coating build | Strong fit | Finished dimensions are controlled together with the Ni-Cu-Ni thickness. |
| Permanent immersion | Switch coating system | Standard nickel plating is not treated as a universal permanent-immersion solution. |
| Seawater / continuous salt exposure | Switch coating system | Use a stronger corrosion-protection system selected for the actual exposure. |
| Aggressive chemicals | Switch coating system | Protection must be selected around the specific chemical environment. |
OSENC machines through holes and countersinks before Ni-Cu-Ni plating so the hole wall, countersunk face and external surfaces enter the plating process together. Finished magnets are not drilled afterward because post-machining breaks the coating and exposes NdFeB.
For deep or blind holes, OSENC defines the required plated depth and acceptance criteria from the actual hole diameter, depth and geometry. The drawing must identify the surfaces that require verified coating coverage.
We review fragile corners, countersunk margins and thin sections before plating so protected edges are not designed around avoidable crack or handling risks.
We machine holes before plating and do not drill finished Ni-Cu-Ni magnets afterward, preventing exposed NdFeB at the new cut surface.
We define plated depth and inspection requirements for deep or blind holes instead of treating a recessed surface like an open face.
Finished surfaces and packaging protection are checked before shipment to reduce coating damage during transport and assembly.
The project is controlled as a finished-part process. Each step carries forward the drawing, coating and magnetic requirements that matter to the final assembly.
Finished dimensions, tolerances, holes, countersinks, critical fits, surface requirements and magnetization are defined.
The NdFeB grade or magnetic target is matched to the required geometry, operating condition and magnetic circuit.
The magnet geometry is produced before plating, including through holes and countersinks that must enter the coating process.
The specified NdFeB + Ni + Cu + Ni protection system is applied with the required total coating build.
Magnetization is completed after plating according to the approved direction or pole layout.
Critical dimensions, surface condition, magnetic performance, pole direction and packaging protection are checked before shipment.
Our inspection plan focuses on the finished magnet that reaches your assembly, not only the bare NdFeB core.
OSENC selects the coating from the actual environment, surface behavior and dimensional requirement.
| Coating | OSENC Uses It When | Main Purchasing Check |
|---|---|---|
| Nickel / Ni-Cu-Ni | General-purpose metallic finish, controlled indoor use and normal industrial handling. | Stack, total thickness, geometry, finished tolerance and exposure. |
| Zinc | Economical mild-environment protection is the priority. | Passivation, appearance and corrosion requirement. |
| Epoxy | A polymer barrier is preferred for humid or more corrosion-sensitive duty. | Edge damage, coating system, finished dimensions and test condition. |
| PTFE | Low friction, non-stick behavior or chemical-surface performance drives the design. | PTFE construction, dimensional build and chemical exposure. |
Before sampling, we return the proposed NdFeB grade or magnetic basis, Ni-Cu-Ni coating requirement, finished dimensional tolerance, magnetization definition and inspection requirement used for the project. MOQ 1 is available for custom samples.
OSENC uses 15–21 μm as the standard total Ni-Cu-Ni thickness. Other Ni-Cu-Ni builds are manufactured only when the project specification defines the required coating thickness and inspection method.
OSENC uses ±0.10 mm as the standard finished-part tolerance and ±0.05 mm as the precision target for suitable geometries. Tighter tolerances are quoted only when the specific geometry, grinding route, plating build and inspection capability support the approved drawing.
Yes. OSENC machines through holes and countersinks before Ni-Cu-Ni plating so the hole wall, countersunk face and external surfaces enter the plating process together. Finished magnets are not drilled afterward.
OSENC manufactures custom disc, cylinder, block, ring and countersunk geometries to drawing. Micro, thin-section, large-diameter and other extreme geometries are reviewed against machining, plating, handling and inspection requirements before quotation.
OSENC uses Ni-Cu-Ni for general industrial, indoor and controlled-humidity applications. For long-term immersion, seawater, continuous salt exposure, permanently wet assemblies or aggressive chemicals, we move the project to epoxy, PTFE, Parylene, encapsulation or another dedicated corrosion-protection system.
MOQ 1 is available for custom sampling. Send the drawing, grade or magnetic target, magnetization, Ni-Cu-Ni requirement, operating environment and inspection needs.
In NdFeB purchasing specifications, “nickel coated” and “nickel plated” are commonly used for an electroplated metallic protection system. For OSENC Ni-Cu-Ni magnets, the controlled requirement is the NdFeB + Ni + Cu + Ni stack, total coating thickness, finished dimensions and required surface condition.
Yes. The Ni-Cu-Ni build becomes part of the finished physical dimensions and working gap. OSENC therefore defines critical dimensions after plating and evaluates coating build together with the required finished tolerance.
No. OSENC uses Ni-Cu-Ni as a practical protective finish for indoor, controlled-humidity and normal industrial applications, but we do not treat standard nickel plating as a universal waterproof or permanent-immersion coating. Wet, marine, salt and chemical environments require application-specific coating selection and validation.
Nickel plating does not increase the intrinsic magnetic strength of the NdFeB core. The finished Ni-Cu-Ni build becomes part of the physical working gap, so very small-gap assemblies should include coating thickness in the magnetic design and validation method.
Send the finished dimensions, magnetic target, magnetization, Ni-Cu-Ni requirement, operating environment, quantity and inspection needs. OSENC will return the coating, grade, tolerance and inspection proposal needed to move the project into sampling.
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