Custom Neodymium Bar Magnets

We manufacture custom neodymium bar magnets (NdFeB) for global industrial suppliers, OEM manufacturers, and engineering companies requiring tight dimensional tolerances, stable bulk supply, and engineered magnetic performance. Produced from sintered Neodymium-Iron-Boron material, our bar magnets deliver high magnetic energy in compact geometries. We support non-standard dimensions, specific magnetic grades, tailored magnetization directions, and engineered protective coatings to fit automated machinery, sensors, motors, and high-precision assemblies.

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Factory-Direct Custom Neodymium Bar Magnets for Industrial & OEM Applications

Produced from sintered Neodymium-Iron-Boron material, our bar magnets deliver high magnetic energy in compact geometries. We support non-standard dimensions, specific magnetic grades, tailored magnetization directions, and engineered protective coatings to fit automated machinery, sensors, motors, and high-precision assemblies.

Custom Dimensions & Precision Machining

Industrial assemblies require precise integration to avoid mechanical interference or positioning errors. We manufacture bar magnets according to technical drawings, CAD files, or physical samples.

Dimensional Range: From micro-bar magnets for precision electronics (2 x 1 x 0.5 mm) to large industrial blocks for mechanical holding systems.

Tolerance Control: Standard mechanical processing tolerances are held at ±0.1 mm. For automated robotic pick-and-place or precision sensor housings, advanced grinding achieves tolerances down to ±0.02 mm with a surface finish of Ra 0.8.

Value for Engineers: Custom dimensions eliminate the need to redesign structural housings around off-the-shelf catalog sizes, optimizing both magnetic efficiency and assembly clearance.

Magnetic Grades & Technical Performance

Neodymium magnets provide high energy products among permanent magnetic materials. We supply grades formulated for specific holding force and temperature requirements:

Available Grades: N35, N38, N40, N42, N45, N48, N50, and N52.

Energy Product Range: Maximum energy product (BHmax) spans approximately 33 - 55 MGOe depending on the selected grade.

Magnetic Induction: Residual magnetism (Br) ranges from 11,700 to 14,800 Gauss, and intrinsic coercivity (Hcj) is >= 12 kOe, ensuring long-term resistance to demagnetization.

Temperature Stability: Standard grades operate up to 80 °C. For high-temperature applications (such as electric motors or generators), we offer high-coercivity temperature grades (H, SH, UH, EH) rated for operational limits up to 180 °C - 200 °C.

Magnetization Configurations

To maximize magnetic flux utilization within your circuit, we provide distinct magnetization vectors:

Axially Magnetized: Poles located on the two flat end faces. Used in magnetic sensors, reed switches, and linear actuators.

Diametrically Magnetized: Poles oriented across opposite parallel sides or widths. Used in rotary shafts, miniature motors, and magnetic couplings.

Multi-Pole Magnetization: Alternating pole patterns mapped onto a single flat surface. Used in specialized magnetic clamping fixtures and encoder arrays.

Controlled Manufacturing Process

Consistency across bulk production batches is critical for automated assembly lines. Our production sequence follows rigorous process monitoring:

Raw Material Preparation: Vacuum induction melting using precise rare-earth and elemental proportions.

Powder Pressing & Alignment: Magnetic field powder compaction (pressing in alignment fields) to maximize crystallographic orientation.

Vacuum Sintering: Densification performed in high-vacuum sintering furnaces.

Precision Machining: Wire-EDM, slicing, and double-disc grinding to meet precise dimensional prints.

Surface Treatment: Application of engineered metallic or organic protective barriers.

Magnetization & Testing: Impulse magnetization followed by 100% magnetic flux and visual verification.

Engineered Surface Coatings

Unprotected NdFeB material oxidizes rapidly due to its iron content. We apply distinct coating systems verified by salt-spray testing:

Coating Type	Thickness / Specifications	Typical Application & Performance
Ni-Cu-Ni (Nickel-Copper-Nickel)	15 - 25 um (Standard triple layer)	General industrial use; passes 48-hour neutral salt spray test (NSS).
Zinc (Zn)	8 - 15 um	Cost-effective option for dry indoor environments.
Epoxy	15 - 30 um	Moisture-resistant; suited for humid conditions, pumps, and valves.
Gold (Au)	Precious metal finish over Ni-Cu-Ni	Medical devices and electronic contacts requiring aesthetic or chemical inertness.
Parylene	Ultra-thin vapor-deposited film (5 - 10 um)	Precision micro-assemblies requiring uniform, pinhole-free insulation.

Industrial Applications

Industrial Automation & Robotics: Compact bar magnets provide reliable holding force and positioning feedback in robotic grippers and automated assembly fixtures.

Motors & Generators: High remanence and energy density improve air-gap magnetic field intensity in PMDC and brushless motors.

Sensors & Reed Switches: Stable magnetic fields ensure precise switching distances and trigger reliability.

Magnetic Clamping Systems: High coercivity allows secure locking and quick-release mechanisms in heavy tooling applications.

Technical Specification Matrix

Parameter	Specification Standard
Base Material	Sintered Neodymium Iron Boron (NdFeB)
Shape	Bar / Block / Custom Profile per Drawing
Performance Grades	N35 – N52 (Standard & High-Temperature H/SH/UH series)
Max Energy Product	Up to 55 MGOe
Coatings	Ni-Cu-Ni, Zinc, Epoxy, Gold, Parylene
Magnetization Direction	Axial, Diametric, Multi-Pole
Standard Tolerances	±0.1 mm (Precision grinding down to ±0.02 mm)
Operating Temperature	Up to 80 °C (Standard) / up to 200 °C (High-Temp grades)

FAQ

Q: What details are required to quote a custom neodymium bar magnet?

A: Provide magnet dimensions (length, width, thickness), required magnetic grade, magnetization direction, coating type, operating temperature, and estimated annual usage volume. Engineering drawings or 3D CAD files are preferred.

Q: How do I choose between standard grades (like N38) and high-performance grades (like N52)?

A: Grade selection depends on space constraints and holding force targets. If installation space is strictly limited but high attractive force is required, N52 delivers maximum performance. If thermal stability or cost optimization is the priority, lower grades or temperature-resistant variants (such as N42H) are recommended.

Q: Can you manufacture magnets to strict custom tolerances?

A: Yes. Standard blocks are machined to ±0.1 mm, but precision applications can be met with tolerances controlled down to ±0.02 mm via specialized grinding equipment.

Q: What coating should be specified for high-humidity environments?

A: Epoxy coatings or specialized multi-layer treatments are recommended for humid or outdoor conditions to protect the underlying iron matrix from oxidation and structural degradation.

Q: Do you support prototype sample runs before mass production?

A: Yes. Sample manufacturing is available for validation of dimensions, magnetic pull force, coating durability, and assembly compatibility before starting bulk wholesale production.

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