Products
Large Strong Round Magnets
Purchase factory-direct Large Strong Round Magnets from Zhaobao Magnet Group today. Certified to IATF16949 and ISO9001, Zhaobao delivers custom heavy-duty neodymium magnets from N35 to super-high N54UH/N48EH grades with direct pricing, free evaluation samples, and reliable global delivery for industrial applications.
Send Inquiry
Product Description
Purchase factory-direct Large Strong Round Magnets from Zhaobao Magnet Group today. With over 30 years of manufacturing experience, an 8,000-ton annual output, and 22 patents developed with the Chinese Academy of Sciences, we supply custom-engineered N35-N54UH neodymium magnets for mining, motors, and heavy machinery. Enjoy fair factory pricing, certified IATF16949 quality, free test samples, and full test data.
How Diameter and Thickness Combine to Generate Pull Force
In heavy industrial magnetics, holding force scaling is non-linear. Doubling the surface area of a magnetic disc does not merely double its holding capacity—it increases magnetic flux concentration exponentially when paired with adequate axial thickness.
| Dimensions (Diameter x Thickness) | Approx. Mass (g) | Theoretical Max Vertical Pull Force (kg) | Optimal Steel Plate Thickness for Max Flux |
|---|---|---|---|
| 50 mm x 10 mm | ~147 g | ~65 kg | 10 mm steel plate |
| 75 mm x 15 mm | ~497 g | ~185 kg | 15 mm steel plate |
| 100 mm x 20 mm | ~1,178 g | ~420 kg | 20 mm steel plate |
The Flux Return Path Principle: A large magnet's strength is underutilized if attached to thin sheet metal. Magnetic flux lines require a thick steel backplate to complete their flux return path without reaching magnetic saturation. If attached to a 2mm sheet metal wall, a 100mm disc will experience significant flux leakage, reducing effective hold force by up to 60%. Our engineering staff works directly with your mechanical team to calculate optimal backing steel specifications.
Mounting Engineering for Large Neodymium Discs
Sintered NdFeB permanent magnet material has a density of approximately 7.5 g/cm³. Large round discs present significant structural mounting challenges due to their weight and massive gravitational pull. For example, a single 100mm x 25mm disc weighs nearly 1.5 kg.
Thermal Management and Internal Demagnetization Risks
Due to their large cross-sectional mass, large round magnets dissipate internal heat far slower than small disc magnets. In high-speed permanent magnet motors, generators, or magnetic separation drums, high-frequency magnetic field alterations induce internal eddy currents. These currents create localized internal core heating far above the ambient surface temperature.
To avoid catastrophic loss of excitation, standard N-grade material (max 80°C / 176°F) should never be used in continuous dynamic machinery. We recommend selecting high-coercivity grades such as N45UH (180°C), N42EH (200°C), or N38AH (230°C), which retain high intrinsic coercivity (Hcj ≥ 25-30 kOe) to prevent thermal degradation.
Handling High-Power Industrial Discs
CRITICAL WARNING: Industrial-scale neodymium magnets carry immense attractive forces and can cause severe physical trauma if handled carelessly.
Heavy Industrial Applications for Large Permanent Magnets
Our heavy-duty Large Strong Round Magnets serve critical industrial sectors where continuous electromagnetic power is either unfeasible or energy-cost prohibitive:
Coating Durability Under Severe Mechanical Stress
Large magnets encounter severe mechanical stress during installation. Standard thin Ni-Cu-Ni plating (10-15 μm) can easily chip or scratch during heavy assembly, exposing raw iron to moisture and oxidation.
| Coating Type | Thickness Spec | Salt Spray Resistance (SST) | Recommended Environment |
|---|---|---|---|
| Standard Ni-Cu-Ni | 12 - 18 μm | 24 - 48 Hours | Indoor factory automation, clean assembly rooms. |
| Heavy-Duty Epoxy (Black) | 30 - 50 μm | 96 - 240 Hours | High-humidity outdoor gear, marine equipment, mining. |
| Parylene C Coating | 10 - 20 μm | 100+ Hours (Pin-hole Free) | Chemical immersion, medical devices, vacuum systems. |
Precision Machining Tolerances and Dimension Control
Large industrial magnets are frequently press-fitted into precision steel rotors or keyway slots. Standard industrial tolerances (±0.1mm) can cause assembly jams or structural slop in high-RPM equipment.
Zhaobao Group utilizes specialized multi-axis CNC surface grinding and wire-cutting machinery, achieving tight dimensional tolerances down to ±0.02mm for thickness and ±0.05mm for outer diameter. Every individual batch of our Large Strong Round Magnets includes verified dimensional inspection test sheets.
Cost-Benefit Analysis: Single Large Disc vs. Multi-Magnet Array
When designing high-strength holding rigs, engineers often compare utilizing a single large disc against assembling multiple smaller disc magnets into a Halbach array.
Single Large Disc Advantages: Unmatched structural simplicity, eliminated risk of magnet-to-magnet repelling failure during assembly, and zero risk of individual magnet adhesive shear. Best suited for high-load suspension, heavy-lifting rigs, and robust industrial couplers.
Multi-Magnet Array Advantages: Lower individual component weight for manual assembly, flexible physical arrangement, and reduced risk of single-point thermal degradation. Best suited for wide-surface planar conveyors.
Storage, Packing, and Transportation Safety Guidelines
Shipping high-field permanent magnets requires specialized magnetic shielding packaging to comply with international IATA air cargo and maritime safety regulations.
30-Year Industrial Precision: Zhaobao Magnet Group
Established in the 1990s, Zhaobao Magnet Group is recognized as one of China's pioneer rare-earth enterprise groups. Operating over 60,000 square meters of primary production facilities and supported by more than 500 dedicated employees, our factory delivers an annual output exceeding 8,000 tons of high-grade neodymium magnets. In strategic partnership with the Chinese Academy of Sciences, we established the "Permanent Magnet Motor Magnet Engineering Technology Center." As of 2022, our engineering team holds 22 proprietary invention patents, successfully mass-producing super-high grades including N54, N54SH, N54UH, N48EH, and N45AH.
When you purchase our Large Strong Round Magnets, you work directly with the primary manufacturer. By managing raw material sintering, wire cutting, multi-axis grinding, custom plating, and testing completely in-house, we eliminate intermediary markups, guarantee precise dimensional tolerances, and provide full traceability with test reports for every batch.
Direct Factory Transparency & Free Testing Samples
Many of our heavy-equipment and industrial automation partners transitioned to Zhaobao Group after facing severe field demagnetization or mechanical coating failure from third-party vendors. Our heavy-duty Large Strong Round Magnets are engineered specifically to withstand rigorous continuous-duty applications. We provide no-cost evaluation samples and complete material test data, allowing your engineering teams to verify mechanical integrity and pull force prior to full-scale production.
Frequently Asked Questions
Q1: Can I drill, saw, or machine a large round magnet after delivery?
A: Absolutely NOT. Sintered NdFeB is an extremely hard and brittle ceramic material. Machining attempts will shatter the magnet, destroy its protective surface coating, and generate fine NdFeB grinding dust. This dust is toxic and highly flammable. All mechanical holes, counterbores, and slots must be precision machined by Zhaobao Group prior to initial magnetization.
Q2: How competitive are your large magnet prices? Are there hidden fees?
A: We operate as a direct manufacturing base with in-house raw material sourcing and complete manufacturing capabilities. You purchase directly from our technical sales team without middleman markups. We provide fully transparent pricing for both production volumes and custom technical prototypes.
Q3: Can we request pre-production samples prior to contract placement?
A: Yes. We provide evaluation samples for corporate engineering teams to test mechanical fit, holding force, and surface coating durability.
Q4: What certifications govern your manufacturing line?
A: Zhaobao Magnet Group operates under IATF 16949 (Automotive Quality System) and ISO 9001 quality management. Material safety compliance certificates (RoHS, REACH) and flux inspection sheets accompany shipments.
Q5: What is the optimal strategy for separating stuck large magnets?
A: Never attempt to pull two large strong magnets straight apart—the vertical force is far too immense. Instead, place the magnets on a sturdy wooden bench and slide one magnet laterally off the edge of the stack while holding the other firmly in place.
Hot Tags: Large Strong Round Magnets, Supplier, Manufacturer, Factory
Related Category
Send Inquiry
Please feel free to give your inquiry in the form below. We will reply you in 24 hours.
