Custom samarium cobalt (SmCo) magnets

Remanence (Br), coercive force (HcB), intrinsic coercivity (HcJ) and maximum energy product ((BH)max) describe different magnetic properties. Compare values with their units, temperature and test conditions. A family name or energy-product label is not a complete material specification.

Confirm the material designation, required limits and the records that apply to the proposed order. Reference data from another producer provides technical context; it does not establish the specification of a Magnetstek part.

Geometry, the magnetic circuit, the working point and opposing fields influence whether the part stays in a suitable region of its demagnetization curve. Evaluate continuous operation, brief peaks and cycling separately.

A reversible temperature coefficient describes an approximate change over a stated range. It does not predict irreversible loss or replace the grade’s temperature-dependent curves. Curie temperature is different from the allowable operating temperature.

Show the required north and south pole faces, axis or pole pattern on the drawing. Axial, diametric and multipole arrangements have different geometry and fixture requirements. For a ring or arc, include where the useful field is needed in the assembly.

Specify the polarity or field check for acceptance, including the measurement location and working gap. Confirm feasibility for the finished dimensions before quotation.

Define the finished dimensions, tolerances, holes, chamfers and surfaces that locate the part. Thin walls, sharp corners and small features require a drawing review because SmCo is brittle.

Discuss handling, assembly loads and any protective housing. State which dimensions are critical and allow room for a proposed coating where it affects fit. Requested geometry and tolerances remain subject to feasibility review.

Decide from the proposed grade, environment, cleanliness requirements and mating materials. The coating decision should account for humidity, chemicals, cleaning, handling wear and exposed surfaces rather than a blanket corrosion claim.

If a coating is required, specify its material, thickness, coverage, dimensional allowance and inspection method. Medical, aerospace or other regulated uses require the relevant application-level validation; a material choice or coating alone does not establish qualification.

Density, thermal expansion, mechanical behavior and surface condition may matter alongside magnetic properties. Use data for the proposed material and temperature range when reviewing mass, fit, adhesives or a housing.

Do not use a generic physical-property table as a finished-part acceptance record. Agree the evidence needed for each design requirement.

For a motor, sensor, coupling, holding assembly or other design, identify the magnetic function and operating gap first. Include the return path, motion, thermal cycle, reverse field and environment.

Specify the required output and how it will be measured in the assembly. A general application example is a design starting point and does not establish that a particular SmCo grade or Magnetstek part is qualified for that use.

SmCo magnets can chip or fracture on impact. Plan separation, protective packaging, assembly tools and inspection for damaged edges. Keep loose magnets away from children and review pinch, fragment and magnetic-field hazards in the actual workplace.

For implanted medical devices or sensitive equipment, follow the device manufacturer’s instructions and the applicable site safety procedure. The component page is not a system safety assessment.