OSENC Magnetic Separation
Do not choose an NdFeB grade from the N-number alone. Start with the field or force required at the real air gap, then check magnet dimensions, magnetic circuit, operating temperature, opposing field, irreversible-loss limit, coating, tolerance, and cost. A higher maximum energy product does not automatically make the application safer or better.
What the Grade Name Tells You
The numerical part commonly indicates an energy-product range, while suffixes commonly identify coercivity/temperature families. Exact values and available sizes vary by manufacturer and current material source. Use the approved datasheet and demagnetization curves for the quoted batch route.
Selection Sequence
- Define force, field, torque, or sensing target at a stated gap.
- Provide the complete magnetic and steel circuit, not only the magnet size.
- State normal, peak, and fault temperature with duration.
- Identify opposing fields, shocks, vibration, and mechanical load.
- Set acceptable reversible and irreversible magnetic loss.
- Define coating, dimensions, magnetization, quantity, and inspection.
Why Higher Grade Can Be the Wrong Choice
- The higher grade may have a different temperature/coercivity trade-off.
- Thin geometry or an open magnetic circuit can create a poor operating point.
- A stronger magnet may saturate nearby steel without improving useful air-gap performance.
- Cost and supply risk may rise without measurable application benefit.
Documents to Confirm
For critical projects, review the BH/demagnetization curve, temperature condition, magnetic simulation or calculation, sample measurements, dimensional tolerance, coating, and final assembly test. Requests up to N56 can be reviewed where the selected material source and production route support the drawing, but availability and suitability must be confirmed for each project.
RFQ Checklist
Send drawing, application, air gap, mating steel, field/force target, temperature, coating environment, magnetization direction, quantity, tolerance, and test method.
Select Grade with Geometry and Temperature Together
| Decision rule | Choose a grade only after the magnetic circuit defines required operating flux, opposing field and temperature; a higher room-temperature grade is not automatically more stable in service. |
|---|---|
| Inputs to confirm | Magnet dimensions, working point, steel circuit, air gap, temperature profile, corrosion, coating, magnetization direction, tolerance and required magnetic test. |
| Risk or limitation | Catalog maximum operating temperatures are not universal design limits and can change with geometry, load line and demagnetizing exposure. |
| Buyer action | Approve the material datasheet and drawing, then validate a sample or assembly under the intended thermal and magnetic condition. |
How We Turn This Guidance into a Project Decision
How to Select a Neodymium Magnet Grade: seller-side application review
- Your buying problem: General product information cannot show whether a magnetic solution will control contamination, prevent equipment damage or fit the available production space.
- What we review: We confirm your material, particle size, moisture, temperature, throughput, contaminant, installation position, interfaces, environment and cleaning requirement.
- What we do: We compare suitable structures, configure the practical option and coordinate the drawing, manufacturing route and inspection scope.
- Buyer value: This helps you reduce selection risk, avoid rework and connect the purchase to a clear operating and quality-control objective.
- Boundary: We do not present an unverified model, performance number or certification as a confirmed project fact.
- Next step: Send the material and target, particle range, moisture, temperature, throughput, contamination, installation drawing, available space, cleaning preference and any sample or site video. Send project data for our review
Project Support
Need help selecting the right magnetic solution?
Send us your material, flow condition, target metal, capacity, installation space and any drawings or site photos. We will review the application and recommend the next practical step.
Frequently Asked Questions
What the Grade Name Tells You?
The numerical part commonly indicates an energy-product range, while suffixes commonly identify coercivity/temperature families. Exact values and available sizes vary by manufacturer and current material source.
Why is “Documents to Confirm” important for this decision?
For critical projects, review the BH/demagnetization curve, temperature condition, magnetic simulation or calculation, sample measurements, dimensional tolerance, coating, and final assembly test.
Why is “RFQ Checklist” important for this decision?
Send drawing, application, air gap, mating steel, field/force target, temperature, coating environment, magnetization direction, quantity, tolerance, and test method.
Ben — OSENC
Ben has more than 20 years of experience in the magnetic separation equipment industry and has worked with OSENC since 2019. He focuses on magnetic separators, tramp iron removal systems, metal recovery equipment, and custom magnetic separation solutions.
He helps customers clarify material type, particle size, moisture level, capacity, feeding method, target metal, and installation conditions, reducing wrong model selection, failed separation results, and unnecessary sample testing.