Permanent Magnet Block: Component Specs, Materials & Applications

Component Specifications

Definition

A permanent magnet block is a solid, rectangular or cuboidal magnetic component manufactured from hard magnetic materials that retain their magnetization indefinitely. These blocks are engineered with precise dimensions, magnetic orientation, and surface finish to serve as fundamental building blocks in industrial magnet arrays. They generate consistent magnetic flux density across their surfaces and are assembled into arrays to create specific magnetic field patterns for applications like material handling, separation, positioning, and magnetic levitation systems.

Working Principle

Permanent magnet blocks operate based on the intrinsic magnetic properties of hard ferromagnetic materials (like neodymium-iron-boron or samarium-cobalt). These materials have high coercivity and remanence, meaning once magnetized, they maintain a strong magnetic field without external energy input. The blocks are magnetized along specific axes (typically through-thickness or lengthwise) during manufacturing. When arranged in arrays with alternating polarity, they create complex magnetic field patterns through superposition, where the magnetic flux from individual blocks combines to produce the desired field strength and gradient for industrial applications.

Materials

Neodymium-Iron-Boron (NdFeB) N52 grade with nickel-copper-nickel triple-layer coating for corrosion protection. Alternative: Samarium-Cobalt (SmCo) for high-temperature applications up to 350°C. Material specifications include: Remanence (Br): 1.48 T minimum, Coercivity (Hc): ≥1350 kA/m, Maximum Energy Product (BHmax): 52 MGOe, Density: 7.5 g/cm³, Curie Temperature: 310°C for NdFeB.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Coating	Ni-Cu-Ni (10-15μm per layer), epoxy coating optional
Tolerance	±0.1mm on critical dimensions, ±0.2mm on non-critical
Dimensions	Standard sizes: 50x25x10mm, 100x50x20mm, 150x75x30mm (LxWxH)
Pull Force	15-150 kg (depending on size and grade)
Surface Gauss	4500-5200 Gauss on surface (depending on grade and size)
Magnetic Orientation	Through-thickness (axis), multi-pole magnetization available
Operating Temperature	-40°C to +80°C (NdFeB), up to 350°C (SmCo)

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

ISO 17554:2014, DIN 17410, IEC 60404-8-1

Parent Products

This component is used in the following industrial products

Magnet Array

A precisely arranged assembly of permanent magnets designed to generate controlled magnetic fields for motion applications.

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Engineering Analysis

Risks & Mitigation

Demagnetization from high temperatures
Corrosion in humid environments
Brittle fracture from mechanical impact
Magnetic field interference with sensitive equipment
Pinching hazards during handling

FMEA Triads

Trigger: Exposure to temperatures above maximum operating limit
Failure: Partial or complete demagnetization, reduced magnetic performance
Mitigation: Use temperature-resistant grades (SmCo) for high-temperature applications, implement thermal monitoring, design cooling systems for arrays

Trigger: Inadequate corrosion protection in harsh environments
Failure: Surface corrosion leading to material degradation and magnetic property loss
Mitigation: Apply triple-layer Ni-Cu-Ni coating, use epoxy coatings for additional protection, specify stainless steel encapsulation for severe conditions

Trigger: Mechanical stress during assembly or operation
Failure: Cracking or chipping of brittle magnet material
Mitigation: Use proper handling tools, design protective housings, implement controlled assembly processes, avoid impact loading

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Dimensional tolerance per ISO 2768-mK, magnetic properties within ±5% of specified values, coating thickness 30-45μm total

Test Method

Gauss meter measurement per IEC 60404-14, dimensional verification with coordinate measuring machine (CMM), coating thickness measurement with eddy current or magnetic induction gauges, pull force testing with calibrated force gauge

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

Check the legal entity, factory address, ownership, certifications, and direct contacts.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Manufacturers of Permanent Magnet Block

Manufacturer profiles associated with Permanent Magnet Block.

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Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review

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Frequently Asked Questions

What is the difference between through-thickness and lengthwise magnetization?

Through-thickness magnetization means the magnetic poles are on the largest faces (top/bottom), creating maximum surface field. Lengthwise magnetization has poles on the ends, useful for specific array configurations where magnetic fields need to be oriented horizontally.

How do I prevent demagnetization of permanent magnet blocks?

Avoid temperatures above maximum operating limits (80°C for standard NdFeB), strong opposing magnetic fields, mechanical impacts, and corrosive environments. Use appropriate protective coatings and handle with non-magnetic tools during assembly.

Can permanent magnet blocks be customized for specific array designs?

Yes, manufacturers can produce blocks with custom dimensions, magnetization patterns (multi-pole), specific magnetic strengths, and specialized coatings. Tolerance can be tightened to ±0.05mm for precision applications.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Permanent Magnet Block