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Technical Knowledge

Resources & Engineering Insights

Reusable technical guides, procurement checklists, and permanent magnetic material comparison papers.

Insight Type The kind of resource this is, as filed under its own insight type.
Key Question The question the resource was written to answer.
Key Takeaway The conclusion the resource draws from it.
Last Reviewed The date the content was last checked, printed when the record carries one.
Published Resources

Every Resource, With Its Question and Takeaway

Each card carries the question the resource answers, the takeaway it draws, the date it was last reviewed and the materials and processes it relates to — read from the record itself, not restated here.

Technical Guide

Ferrite vs. NdFeB: Motor Selection Guide

When to pick hard ferrite over NdFeB in a motor: flux, volume and temperature trade-offs, and why the route is fixed before tooling.

Key Question

When should an engineer specify Hard Ferrite over Neodymium Rare Earth magnets in motor design?

Key Takeaway

Ferrite needs no coating where the volume allows, with the grade's usable temperature confirmed per project. NdFeB is the route to evaluate where power density and a compact envelope leave ferrite no room.

Materials Hard Ferrite (Ceramic) Magnets Neodymium (NdFeB) Rare Earth Magnets
Processes Wet Pressed Ferrite Sintered NdFeB

Last reviewed: 26/10/2026

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Buying / Sourcing Guide

Custom Magnets from China: What to Confirm

What to confirm before a custom magnet order goes to production: shape, dimensions, magnetic requirements, tolerances, quotation and sample approval.

Key Question

What information and approvals should a buyer clarify before a custom magnet order moves into production?

Key Takeaway

Start with the information you have, then agree the geometry, magnetic requirements, tolerances and quotation basis. Confirm samples in your assembly before the first bulk order, and retain the approved production references for repeat supply.

Materials Hard Ferrite (Ceramic) Magnets Neodymium (NdFeB) Rare Earth Magnets

Last reviewed: 20/10/2026

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Technical Guide

Magnet Tolerances, Grinding and Plating

How critical tolerances are reached on sintered magnets, and which coating survives the exposure. Mark them on the drawing before tooling.

Key Question

How are critical tolerances achieved on sintered magnets, and which surface protection survives harsh industrial environments?

Key Takeaway

Sintered ferrite is a brittle ceramic, while sintered NdFeB is a brittle metallic material. Critical dimensions are commonly achieved through suitable grinding or other specialist finishing processes. Surface protection is selected against the material, service exposure and assembly.

Materials Hard Ferrite (Ceramic) Magnets Neodymium (NdFeB) Rare Earth Magnets
Processes Wet Pressed Ferrite Sintered NdFeB

Last reviewed: 17/09/2026

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Technical Guide

How to Specify Magnetization on a Drawing

How to describe magnetization on a drawing: orientation, direction, pole pattern and pole location, with N and S marked on the sketch or on a sample.

Key Question

How do I describe the magnetization a part needs, and what do the terms actually mean?

Key Takeaway

Orientation, direction, pole pattern and pole location are four different things. Describe the direction and the pattern separately, mark N and S on a sketch or a sample, and leave the rest to be confirmed per project.

Materials Hard Ferrite (Ceramic) Magnets Neodymium (NdFeB) Rare Earth Magnets
Processes Wet Pressed Ferrite Sintered NdFeB Dry Pressed Ferrite Injection Molded Ferrite Injection Molded NdFeB Compression Molded NdFeB

Last reviewed: 18/10/2026

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Buying / Sourcing Guide

Only Have a Sample? How to Start an Inquiry

No drawing, grade or magnetization specification? An existing magnet can be a starting point. Learn how photos, sample checks, a dimensional drawing and customer testing can help clarify the requirements, with an example from a citrus juicer motor project.

Key Question

How can a custom magnet inquiry move forward when the buyer has an existing part but no drawing or magnetic specification?

Key Takeaway

Start with the information available. A physical sample can support dimensional and magnetic checks, but observations and process assessments still need to be translated into an agreed proposal and tested in the customer's assembly.

Materials Hard Ferrite (Ceramic) Magnets
Processes Wet Pressed Ferrite

Last reviewed: 20/10/2026

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Buying / Sourcing Guide

B-Grade & Surplus Ferrite Arc Magnets

B-grade and surplus ferrite arcs: how the two differ, what to check on dimensions, condition and magnetization, and which lot terms to fix first.

Key Question

How can buyers source B-grade or surplus ferrite arc magnets while understanding the actual specifications, condition and supply arrangements of each lot?

Key Takeaway

B-grade and surplus stock are different categories. Evaluate the actual dimensions, condition and magnetization status of each lot, and confirm suitability through sample review and your own application checks. Availability and terms are lot-specific.

Materials Hard Ferrite (Ceramic) Magnets

Last reviewed: 20/10/2026

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Technical Knowledge Base

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Our technical team evaluates real-world operating conditions, BH demagnetization curves, and cost vs. performance trade-offs for motor and pump designs.

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