OSENC manufactures zinc coated magnets to drawing for OEM and industrial projects, from MOQ 1 sampling through production supply. We control the zinc finish as part of the finished magnetic component, not as an afterthought added after machining.
Send the coated dimensions, tolerance, NdFeB grade or target performance, magnetization direction, zinc finish, operating temperature and service environment. We lock the approved specification before production.
OSENC specifies zinc coating for general industrial and OEM parts that need a thin metallic finish, controlled finished dimensions and practical corrosion protection in the intended service environment.
Standard zinc is typically silver to silvery-matte. White, black, colored and passivated zinc finishes are handled as separate project requirements. Passivated projects are specified as NdFeB + Zn + Passivation, with the zinc deposit and supplementary treatment defined on the approved specification.
In magnet RFQs, zinc coated magnets and zinc plated magnets are commonly used for the same zinc-finished NdFeB requirement. OSENC uses the approved coating structure, zinc thickness, passivation requirement and finished-part drawing to define the actual production specification.
Specify the finished magnet, not just “zinc plated.” The coating structure, finished dimensions, magnetization and inspection requirements belong in one approved specification.
| Specification | OSENC Supply Direction | RFQ Input |
|---|---|---|
| Coating structure | NdFeB + Zn or NdFeB + Zn + Passivation | Exact finish/passivation callout |
| Shapes | Disc, block, ring, cylinder, arc and drawing-based custom geometry | 2D/3D drawing, holes, slots, chamfers and edge details |
| Grades | N35, N38, N42, N45, N48, N50, N52 plus H and SH; UH/EH for higher-temperature custom projects | Grade or target magnetic performance |
| Magnetization | Axial, diametrical, through-thickness, length, width, radial or multipole where geometry supports it | Direction and pole pattern |
| Zinc finish | Standard, white, black, colored and passivated zinc finishes are handled as distinct project callouts | Appearance, passivation / conversion-treatment type and restricted-substance requirements |
| Finished tolerance | ±0.10 mm standard RFQ reference / ±0.05 mm precision RFQ reference | Critical dimensions after plating |
| MOQ | 1 piece for custom sampling; small-batch validation and production supply supported | Sample and production quantity |
Critical dimensions are checked after zinc plating, so coating build-up is included in the dimensions that determine assembly fit.
When zinc thickness is part of the approved inspection requirement, the measurement method and acceptance range are defined before production.
Pole direction and magnetization configuration are checked against the approved drawing or sample before packing.
The approved sample becomes the reference for finished dimensions, zinc appearance, magnetization and project-specific inspection requirements before production supply.
Assembly fit is determined by the finished part, so OSENC controls critical dimensions after zinc plating. This matters most on thin discs, small blocks, rings, holes and tight mating features where coating build-up can consume assembly clearance.
Use ±0.10 mm as the standard RFQ tolerance reference and ±0.05 mm as the precision RFQ reference. We lock the final tolerance against geometry, coating system and inspection method before production.
| Shape | RFQ Size References | Specify With |
|---|---|---|
| Disc | D6×2, D8×2, D10×2, D10×3, D12×3, D15×3, D15×5, D20×3, D20×5, D25×5, D25×10, D30×5 mm | Diameter, thickness, grade, axial/diametrical magnetization and finished tolerance |
| Block | 10×5×2, 10×10×3, 15×10×3, 20×10×5, 20×20×5, 30×10×5 mm | L×W×T, magnetization axis, edge details and coated dimensions |
| Ring / Arc / Custom | Made to drawing | OD/ID/thickness or complete geometry, tolerances and magnetization |
These dimensions are practical RFQ starting points for custom production. OSENC manufactures to the approved drawing rather than presenting them as fixed stock specifications.
OSENC specifies zinc coated NdFeB for engineering components, electronics, furniture fittings, retail displays, packaging, fixtures, model assemblies and general manufacturing where thin metallic protection and dimensional control match the operating environment.
| Coating | Why We Specify It | Main Engineering Check |
|---|---|---|
| Zinc | Thin metallic finish with lower coating build-up; standard RFQ reference 7–15 μm | General industrial environment, finish/passivation and assembly clearance |
| Ni-Cu-Ni | Common multilayer metallic protection with a thicker total stack than standard zinc | Corrosion requirement, surface contact and tight dimensional fits |
| Epoxy | Polymer barrier when moisture or corrosive-fluid protection is a stronger design priority | Scratching, edge damage, impact and finished dimensions |
| Zn + Passivation | Zinc plating with a supplementary passivation / conversion treatment when a defined finish or additional corrosion protection is required | Zinc thickness, passivation type, appearance, Cr6+ requirement and corrosion-test specification |
OSENC guarantees corrosion-test performance only when the PO defines the test method, sample condition, duration and pass/fail criteria. We do not convert an industry benchmark into a batch guarantee.
For standard zinc-coated N42 projects, 80°C continuous is the design limit. Zinc plating does not raise the magnetic material's temperature capability. We select the correct temperature-grade NdFeB when the application runs hotter.
| Grade Family | Design Reference | OSENC Selection Direction |
|---|---|---|
| N | 80°C | Standard-temperature applications |
| M | 100°C | Moderately elevated temperature |
| H | 120°C | Higher-temperature design |
| SH | 150°C | High-temperature custom project |
| UH | 180°C | Special high-temperature project |
| EH | 200°C | Special high-temperature project |
We confirm the final grade against magnet geometry, magnetic circuit and operating point. The coating never overrides the magnetic material limit.
We inspect visual integrity and coating condition against the approved finish. When thickness is controlled, XRF is the primary non-destructive production reference method.
We verify magnetization direction and pole orientation against the approved drawing or sample before packing.
OSENC provides available RoHS, REACH and SVHC documentation against the approved material and coating specification when required. Cr6+ status is confirmed separately against the selected passivation chemistry and supporting documentation.
For new custom parts, sampling locks dimensional fit, zinc appearance, magnetization and any corrosion or adhesion acceptance requirement before production. We do not turn an industry benchmark into a batch guarantee.
Validate One Custom Sample
OSENC quotes the finished magnetic component against the complete drawing and inspection requirement, not by magnet weight alone.
Dimensions, material volume, NdFeB grade, geometry and machining complexity set the base manufacturing cost.
Zinc finish, passivation, finished tolerance and tight assembly features determine coating and inspection complexity.
Magnetization pattern, compliance documents, test requirements, sample quantity and production volume complete the quotation.
Yes. We manufacture custom zinc coated NdFeB magnets from drawings or approved samples. We lock the finished dimensions, tolerance, grade, magnetization direction, zinc finish, operating temperature and inspection requirements before production.
In many magnet RFQs, the terms are used for the same zinc-finished NdFeB requirement. OSENC defines the actual production part by the zinc coating structure, thickness, passivation requirement, finished dimensions and approved drawing.
The standard project structures are NdFeB + Zn and NdFeB + Zn + Passivation when a conversion or passivation finish is specified. The exact finish is written into the approved specification.
For RFQ engineering, OSENC uses 7–15 μm as the standard zinc-plating reference. For passivated projects, the zinc deposit and supplementary passivation / conversion treatment are defined separately on the approved drawing and inspection plan.
For a standard zinc-coated N42 design, use 80°C as the continuous design limit. We move the magnetic material to M, H, SH, UH or EH grades when the operating temperature requires a higher limit.
No. We do not position standard zinc as a marine, permanent-immersion, strong-acid/alkali or high-abrasion coating. For severe wet, salt, chemical or wear exposure, we select a stronger protection system or encapsulation.
MOQ is 1 piece for custom sampling. We support single-piece samples, small-batch validation and production orders.
Send the drawing, finished dimensions and tolerances, magnet grade or target magnetic performance, magnetization direction, zinc finish or passivation callout, operating temperature, environmental exposure, compliance requirements, test requirements and quantity.
Send your drawing and application requirements. OSENC will lock the finished dimensions, grade, magnetization, zinc finish, temperature and inspection requirements, then quote the sample and production quantity against one controlled specification.
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