Standard Neodymium Bar Magnets

Standard Neodymium Bar Magnets are manufactured from Sintered Neodymium-Iron-Boron (NdFeB), delivering high magnetic energy density in a rectangular block geometry. Designed for industrial assemblies, automation equipment, and consumer products—including electric motors, medical devices, sensors, and actuators—these magnets provide stable magnetic holding force without the tooling overhead of custom designs. Available across grades N35 to N52, with tolerances controlled between +/-0.05 mm and +/-0.10 mm, our inventory supports consistent integration into high-volume manufacturing lines.

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Product Overview

High-Performance Permanent Magnets for Wholesale, Industrial, and OEM Applications

Standard Neodymium Bar Magnets are manufactured from Sintered Neodymium-Iron-Boron (NdFeB), delivering high magnetic energy density in a rectangular block geometry. Designed for industrial assemblies, automation equipment, and consumer products-including electric motors, medical devices, sensors, and actuators-these magnets provide stable magnetic holding force without the tooling overhead of custom designs.

Available across grades N35 to N52, with tolerances controlled between +/-0.05 mm and +/-0.10 mm, our inventory supports consistent integration into high-volume manufacturing lines.

Core Technical Specifications & Performance

Magnetic Energy Grades
Selecting the correct material grade balances holding force requirements against material costs. Higher grades permit smaller footprint designs without sacrificing magnetic output.

Magnet Grade	Remanence (Br, Gauss)	Coercivity (Hc, Oe)	Max Energy Product (BHmax, MGOe)	Max Working Temperature
N35	11,700-12,200	>= 12,000	33-36	80 °C
N42	12,800-13,200	>= 12,000	40-43	80 °C
N48	13,800-14,200	>= 12,000	46-49	80 °C
N52	14,400-14,800	>= 12,000	48-52	80 °C
High-Temp Grades	Varies by grade	Varies by grade	Varies by grade	150 °C - 200 °C

Protective Surface Treatments
Because raw NdFeB contains iron and oxidizes rapidly in ambient air, protective plating is applied post-machining to ensure operational longevity.

Nickel-Copper-Nickel (Ni-Cu-Ni): Standard triple-layer plating providing a smooth metallic finish and reliable corrosion resistance for indoor industrial environments.

Epoxy: Offers enhanced moisture barrier properties, recommended for humid operating conditions or outdoor-adjacent applications.

Zinc: A cost-effective alternative finish suited for mild, controlled indoor environments.

Magnetization Orientations
Through Thickness: Poles are situated on the two largest parallel flat surfaces, optimized for holding and clamping fixtures.

Through Length: Poles are located at the opposite terminal ends of the bar, utilized in linear actuators and proximity sensors.

Multi-Pole Configurations: Available upon request for specialized magnetic rollers and couplings.

Manufacturing & Quality Control

Our production process ensures physical consistency from raw material allocation to final magnetization:

Powder Metallurgy: High-purity raw elements are melted, jet-milled into fine powder, and pressed inside a high-intensity magnetic field to align crystal domains.

Sintering & Machining: Vacuum sintering yields a dense magnetic matrix, followed by diamond-wheel slicing and grinding to hit precise dimensional tolerances.

Inspection Protocols: Every production lot undergoes testing for dimensional accuracy via micrometer/caliper checks, surface magnetic flux verification using a Gaussmeter, and coating adhesion testing.

Typical Industrial Applications

Automation & Workholding: Magnetic clamping fixtures, quick-change tooling bases, and material handling jigs.

Sensors & Electronics: Reed switches, Hall-effect sensor triggers, and brushless DC motor rotors.

Separation Equipment: Industrial magnetic filters and ferrous debris extraction bars.

Electric Motors & Actuators: High-efficiency rotors and stators for automotive and industrial motion systems.

Quick Reference Summary

Material: Sintered NdFeB

Density: ~ 7.5 g/cm3

Standard Tolerances: +/-0.05 mm to +/-0.10 mm

Packaging: Export-grade plastic isolation spacers, magnetic shielding liners, and reinforced cartons compliant with air and sea freight safety standards.

FAQ

Q: What are standard neodymium bar magnets made of?

A: Standard neodymium bar magnets are made from NdFeB (Neodymium-Iron-Boron), a rare-earth magnetic material known for its extremely high magnetic strength compared with ferrite magnets.

Q: What is the strongest grade of neodymium bar magnet available?

A: N52 is one of the strongest commercially available NdFeB grades. It provides very high magnetic energy density and is commonly used where maximum magnetic force is required in a limited space.

Q: Are neodymium bar magnets waterproof?

A: Standard nickel-coated neodymium magnets are not completely waterproof. For humid or outdoor environments, epoxy-coated or specially protected magnets are recommended.

Q: How long do neodymium bar magnets last?

A: Under suitable operating conditions, neodymium magnets can maintain their magnetic performance for decades. Proper coating and temperature selection are important factors affecting service life.

Q: Can you provide custom sizes?

A: Yes. Standard sizes are available for quick supply, while customized dimensions, grades, coatings, magnetization directions, and packaging can be produced according to customer requirements.

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