Permanent magnets are an enabling material for almost every modern electrical and electronic system: from electric motors (the largest single market) to MRI machines, hard-disk drives, audio speakers, microphone capsules, magnetic separators, holding fixtures, sensors, and consumer electronics. The global permanent magnet market is dominated by Chinese production — China supplies approximately 85-90% of global rare-earth magnet output and significant share of ferrite (ceramic) magnet output. For motor manufacturers, electronics OEMs, industrial equipment integrators, and specialty distributors, sourcing magnets directly from a Chinese specialist factory delivers significant cost savings vs distributors and Tier-1 brands while maintaining technical specifications.
This guide covers the Ando Magnetics product family — sintered NdFeB (neodymium-iron-boron) magnets in standard and custom shapes, sintered ferrite magnets, bonded magnets, samarium-cobalt (SmCo) magnets for high-temperature applications, and magnetic assemblies. Real product images linking back to the supplier's catalog at hnandomagnetics.com.
Product range — actual catalogue images
The product images below are hosted on the manufacturer's official website (hnandomagnetics.com) and link directly to the manufacturer's catalogue. Click any image to view the full specification page in a new tab.
Neodymium block magnets stacked in production — nickel-plated finish, ready for export packaging.
View on supplier site →
Large nickel-plated neodymium disc magnets — high-pull-strength variants for industrial applications.
View on supplier site →Permanent magnet types and applications
| Magnet type | Energy product (BHmax) | Max operating temperature | Typical FOB China per kg | Common applications |
|---|---|---|---|---|
| Sintered NdFeB N35 | 33-36 MGOe | 80°C (max use temp) | USD 28-45 | General-purpose, consumer electronics, holding magnets |
| Sintered NdFeB N42 | 40-43 MGOe | 80°C | USD 35-58 | Most-common grade — speakers, motors, sensors |
| Sintered NdFeB N50/N52 | 48-52 MGOe | 65°C (lower temp limit) | USD 55-95 | High-performance applications, premium speakers, compact motors |
| Sintered NdFeB SH grade (high-temp) | 30-38 MGOe | 150°C | USD 45-72 | EV motors, industrial servo motors |
| Sintered NdFeB UH grade | 28-33 MGOe | 180°C | USD 60-95 | EV traction motors, high-temp industrial |
| Sintered NdFeB EH grade | 25-30 MGOe | 200°C | USD 80-130 | Wind turbines, mining equipment, demanding applications |
| Sintered Ferrite Y30 / Y30BH | 3.4-3.8 MGOe | 250°C | USD 2.50-4.50 | Speakers, motors, magnetic separators (cost-sensitive) |
| Sintered Ferrite Y35 / Y40 | 4.2-4.8 MGOe | 250°C | USD 3.50-5.50 | Higher-performance ferrite applications |
| Bonded NdFeB | 10-14 MGOe | 120°C | USD 35-60 | Complex shapes, multi-pole, sensor magnets |
| Samarium-Cobalt SmCo 2:17 | 26-32 MGOe | 300-350°C | USD 280-450 | Aerospace, military, high-temp specialty |
| Samarium-Cobalt SmCo 1:5 | 16-22 MGOe | 250°C | USD 220-380 | Specialty high-temp applications |
Coating selection — what matters for service life
| Coating | Salt-spray resistance | Best for | Cost premium |
|---|---|---|---|
| Nickel (Ni-Cu-Ni triple layer) | 48-96 hours | Standard indoor / sealed enclosure applications | Baseline (included in price) |
| Zinc (Zn) | 24-48 hours | Cost-sensitive indoor; not for humid/marine | -5 to -10% (cheaper) |
| Black Nickel | 48-96 hours | Aesthetic black finish; same protection as Ni | +5-12% |
| Epoxy coating | 72-200 hours | Outdoor industrial, mild-marine, vibration applications | +12-22% |
| Gold (over Ni) | 96-200 hours | Medical, premium specialty | +30-50% |
| Parylene C | 500+ hours | Medical implants, aerospace, demanding chemistry | +45-80% |
| Phosphate | 8-24 hours | Magnets bonded inside resin / housing (no exposure) | -10 to -15% (cheaper) |
| Aluminum (Al) | 72-200 hours | EV motor magnets (better thermal cycling than Ni) | +10-18% |
Why coating matters more than people realize
NdFeB magnets corrode rapidly when exposed to moisture and salt. A nickel-plated NdFeB magnet exposed to coastal humidity without coating-system integrity can develop visible corrosion in 30-60 days. Once corrosion starts, the magnet loses both physical integrity (cracking) and magnetic strength (dimensional changes). For OEM applications where the magnet is sealed in housing, basic Ni coating is fine. For exposed or harsh-environment applications (outdoor sensors, marine equipment, magnetic separators in food/beverage), specify upgraded coating from the start — the cost premium is small relative to field-failure cost.
Quality verification: salt-spray test certificates per ASTM B117 should accompany any coating specification claim. Reputable manufacturers maintain ongoing salt-spray testing on production batches.
Common form factors and specifications
| Form factor | Common dimensions | Typical magnetization direction | Common applications |
|---|---|---|---|
| Disc / cylinder | Ø 3-100mm × thickness 1-50mm | Through thickness (axial) | Holding, sensors, speakers |
| Block / square | 10-150mm × 10-100mm × 1-50mm | Through thickness | Motors, separators, holding fixtures |
| Ring / annular | OD 5-200mm × ID 1-180mm × thick 1-30mm | Axial or radial (specify) | Motors, speakers, sensor rings |
| Arc / segment | Inner R + outer R + arc angle + length | Radial (parallel) | Motor stators, generators, servomotors |
| Sphere | Ø 5-50mm | Through diameter | Specialty, magnetic toys, jewelry |
| Trapezoid / wedge | Custom shapes | Custom magnetization | Wind turbine generators, large motors |
| Hollow / tube | OD 5-100mm × ID 2-90mm × length | Axial typically | Sensors, magnetic shields |
Pricing brackets — wholesale
| Order tier | MOQ (per SKU) | Discount | Lead time |
|---|---|---|---|
| Sample / prototype | 10-100 pcs | List price; air courier | 3-7 days |
| Small wholesale | 500-5,000 pcs / 10-50 kg | 5-15% | 15-25 days |
| Standard wholesale | 10,000-50,000 pcs / 100-500 kg | 15-25% | 20-35 days |
| Container wholesale | 100,000+ pcs / 500-5,000+ kg | 22-35% | 30-50 days |
| OEM project order | Custom volume + spec | Negotiated | 45-90 days (incl. tooling) |
Application-specific selection criteria
| Application | Typical magnet specification | Critical factors |
|---|---|---|
| Speaker / audio (consumer) | NdFeB N42 ring, Ni coating | Magnetization direction, dimensional accuracy ±0.05mm |
| Audio (premium / studio) | NdFeB N48-N52 disc | BHmax, thermal stability, batch consistency |
| Brushless DC motor (small) | NdFeB N42 SH arc segment | Demagnetization curve at operating temp; arc length precision |
| EV traction motor | NdFeB UH/EH or N48 with optimized HRE content | Heavy rare earth (Dy/Tb) content for thermal stability; quality consistency |
| Industrial servo motor | NdFeB SH/UH arc, Al or Ni coating | Temperature performance, dimensional precision |
| MRI / medical | NdFeB high-grade with parylene coating | Field uniformity, biocompatibility, traceability |
| Wind turbine generator | NdFeB EH grade with epoxy coating | Thermal stability, corrosion resistance, batch traceability |
| Sensor (Hall-effect) | NdFeB N42 or bonded NdFeB | Magnetic field uniformity, dimensional accuracy |
| Magnetic separator (industrial) | NdFeB N42 block, epoxy coating | Flux density, mechanical strength, long-term performance |
| Magnetic separator (food/beverage) | NdFeB N42, FDA-compliant coating, stainless housing | FDA/food-contact certification, cleanability |
| Holding magnet (industrial) | Ferrite Y30 or NdFeB N42 (cost-sensitive) | Holding force, mechanical attachment |
| Toys / consumer / education | Ferrite Y30 or NdFeB N35 (compliance-checked) | Children safety standards (ASTM F963, EN 71), small-parts swallowing risk |
Children safety regulation for magnet toys
Strong neodymium magnets in toys have caused multiple severe child-safety incidents (intestinal perforation when multiple magnets are swallowed). Multiple jurisdictions have banned or severely restricted high-powered magnet toys. Verify destination-market regulations: USA — CPSC mandatory standard 16 CFR 1240 (limits flux index for children's magnet sets); EU — REACH + EN 71-1 mechanical hazards section; Australia — Consumer Goods (Small High-Powered Magnets) Ban 2012. Selling non-compliant magnet toys creates major recall liability. For consumer/educational distributors, work with manufacturers who can provide compliance test reports per the destination jurisdiction.
Order workflow — magnet wholesale procurement
- Application analysis — define magnet type (NdFeB grade, ferrite grade, or specialty), form factor, magnetization direction, coating, dimensions, tolerances, and magnetic specification (BHmax, Hcj, Br)
- Sample order — 10-100 pcs of each candidate spec; verify dimensional accuracy with calipers/CMM, magnetic strength with gauss meter, coating integrity with salt-spray (for harsh-environment applications)
- Application validation — install samples in actual application; run for 30-90 days; verify magnetic-field stability, no demagnetization, no corrosion onset
- Wholesale order — 10,000-50,000 pcs minimum for cost economics; specify exact spec, packaging (bagged, tube, custom), and shipping documentation
- Quality acceptance — incoming inspection (sample 1-3% of batch for dimensional + magnetic + coating); document any out-of-spec parts for supplier feedback
- Series replenishment — quarterly to monthly orders based on actual consumption; build relationships with 2-3 alternative suppliers for redundancy on critical SKUs