Permanent Magnet Blocks: Tolerance ±0.1mm to ±0.5mm

Component Specifications

Definition

Permanent magnet blocks are solid, geometrically defined magnetic elements fabricated from hard magnetic materials that retain their magnetization after being magnetized. They are engineered to provide specific magnetic flux density, coercivity, and thermal stability for industrial applications. These components are typically rectangular, square, or custom-shaped blocks with precisely controlled dimensions and magnetic orientation (isotropic or anisotropic) to optimize magnetic circuit performance in assemblies like permanent magnet motors, magnetic separators, holding devices, and scientific instruments.

Working Principle

Permanent magnet blocks operate based on the intrinsic magnetic properties of hard magnetic materials (like neodymium-iron-boron, samarium-cobalt, ferrite, or alnico). Once magnetized, their atomic domains align to create a persistent magnetic field with north and south poles. This field interacts with other magnetic materials or electric currents to produce force (attraction/repulsion), torque in motors, or induce voltage in generators without requiring continuous electrical input, following principles of ferromagnetism and magnetic hysteresis.

Materials

Common materials include: Neodymium-Iron-Boron (NdFeB) - high energy product, temperature grades up to 200°C; Samarium-Cobalt (SmCo) - high temperature stability up to 350°C; Ferrite (ceramic) - cost-effective, good corrosion resistance; Alnico - good temperature coefficient. Material specifications include grade (e.g., N52 for NdFeB), coercivity (Hc), remanence (Br), maximum energy product (BHmax), and operating temperature range.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Tolerance	±0.1mm to ±0.5mm
Dimensions	Custom (typical: 10x10x5mm to 100x100x50mm)
Pull Force	Varies by size/grade (e.g., 5-100 kg)
Surface Coating	Nickel, zinc, epoxy, or passivation
Magnetic Orientation	Isotropic or anisotropic
Operating Temperature	-50°C to +200°C (material dependent)

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 17542, IEC 60404-8-1, ASTM A977

Parent Products

This component is used in the following industrial products

Permanent Magnet Assembly

A magnetic field generation component within electromagnetic vibration testing equipment

View Product Details

Engineering Analysis

Risks & Mitigation

Demagnetization from high temperatures or strong opposing fields
Corrosion (especially for NdFeB)
Brittle fracture during handling
Magnetic interference with nearby equipment

FMEA Triads

Trigger: Exposure to temperatures above material rating
Failure: Partial or complete demagnetization
Mitigation: Select appropriate temperature grade, implement thermal monitoring, use cooling systems

Trigger: Mechanical impact during installation
Failure: Cracking or chipping
Mitigation: Use protective packaging, follow handling procedures, design with protective housings

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Dimensional tolerance per ISO 2768-m, magnetic properties within ±5% of specified values

Test Method

Gaussmeter for flux density, pull test for force measurement, thermal cycling per IEC 60068-2-14

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 Blocks

Manufacturer profiles associated with Permanent Magnet Blocks.

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Frequently Asked Questions

What are the main differences between NdFeB and SmCo permanent magnet blocks?

NdFeB offers the highest magnetic strength but lower temperature resistance (typically up to 200°C) and requires corrosion protection. SmCo has lower strength but superior temperature stability (up to 350°C) and better corrosion resistance, making it suitable for high-temperature applications.

How are permanent magnet blocks typically installed in assemblies?

They are usually secured using adhesives (epoxy), mechanical clamping, or press-fitting into non-magnetic housings. Proper alignment of magnetic poles is critical, and handling requires care to avoid demagnetization from shock, heat, or opposing magnetic fields.

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 Blocks