1. Product Introduction

Block sintered NdFeB magnets are the most widely used standard sintered rare-earth permanent magnets on the market. Featuring regular cuboid structures, mature processing technology and high cost performance, they are available in solid blank blocks, countersunk hole blocks, and slotted step blocks with complete specifications.

These magnets deliver strong and stable magnetic force with multiple anti-corrosion electroplating surface options. Both standard in-stock sizes and customized dimensions, hole machining and chamfering are available. They are the most universal magnetic solutions for industrial magnetic fixing, motor assemblies and equipment positioning.

For detailed magnetic grades, please refer to our NdFeB Magnet Performance Chart.

2. Product Types

1) Standard Solid Block MagnetsSolid hole-free cuboid magnets with sufficient stock sizes and low cost. Mainly used for magnetic adsorption fixing, magnetic bases and general magnetic assembly components.

2) Countersunk Hole Block MagnetsCustom M3/M4/M5/M6 countersunk holes processed in the center or at both ends. The screw heads can be fully embedded for completely flat surfaces, specially designed for tooling, molds and equipment cabinet fixing.

3) Step & Slotted Block MagnetsCustom single-sided steps, double-sided slots and notched structures, suitable for equipment limiting and embedded installation for non-standard equipment modules.

4) Ultra-thin Miniature Block MagnetsCompact thin magnetic blocks widely applied in wireless charging modules, Bluetooth earphones, sensors and precision electronic internal magnetic parts.

5) Large-size Thick Block MagnetsOversized thick magnetic steels for large magnetic jigs, lifting auxiliary magnetic tools and heavy mechanical equipment positioning.

3. Magnetic Grades & Temperature Resistance

N35–N52 (Normal Temperature Series): Max 80℃ — Ordinary indoor equipment & hardware magnetic fixation

33M–48M: Max 100℃ — Electric equipment & small motors

33H–48H: Max 120℃ — Frequency conversion equipment & miniature servo components

30SH–45SH: Max 150℃ — Industrial motors & high-temperature tooling

28UH / 28EH: 180℃–220℃ — Long-term high-temperature working equipment

4. Surface Anti-corrosion Coatings

Ni-Cu-Ni Triple Plating: Mainstream industrial coating with 48-hour salt spray resistance, rust-proof and wear-resistant, widely used for motors and automation equipment.

Black Epoxy Coating: Superior anti-corrosion performance for high-humidity, acid and alkali working environments.

Zinc Plating: Cost-effective coating for indoor ordinary magnetic products with short-term rust protection.

5. Processing Technology & Precision

Sintered blank forming → surface precision grinding → chamfering & deburring → drilling / countersinking / slotting processing → full dimensional inspection → anti-rust electroplating → directional magnetization → packaging & delivery

Dimensional tolerance can be controlled within ±0.02mm. Standard sizes are in stock for same-day delivery, and customized perforated blocks support rapid prototyping.

6. Core Advantages

Complete Specifications & Sufficient Stock

A large number of standard block magnets in stock for fast delivery, supporting both small retail orders and mass procurement.

Strong Magnetism & High Cost Performance

Mass standardized production reduces costs. The suction force is far stronger than ferrite magnets of the same volume, replacing bulky ordinary magnets.

Flexible Installation Methods

Solid blocks support glue bonding; countersunk hole blocks adopt screw locking design for anti-vibration, anti-loosening and easy disassembly & maintenance.

High Processing Flexibility

Support custom drilling, countersinking, slotting, chamfering and ultra-thin cutting to meet any customized size requirements.

Multiple Temperature & Coating Options

Applicable for working temperatures from normal temperature up to 220℃, adapting to indoor, humid and slightly corrosive workshop environments.

Custom Magnetization Solutions

Standard axial magnetization, with customized radial magnetization and multi-pole magnetization available to meet diverse magnetic circuit design needs.

7. Application Scenarios

Industrial Automation: Tooling fixtures, magnetic positioning jigs, mold magnetic fixation, assembly line limit magnets

Motor Equipment: Small brushless motors, vibration motors, generator stator auxiliary magnetic steels

Hardware & Home Furnishing: Cabinet door catches, magnetic tool racks, tool storage bases, glass cleaner magnets

Electrical & Electronics: Wireless charging modules, Bluetooth earphones, sensors, instrument magnetic components

Advertising & Display: Magnetic poster fixing, sign mounting, display cabinet magnetic accessories

Medical Devices: Small physical therapy equipment and testing instrument positioning magnets

8. Selection & Usage Precautions

NdFeB material is brittle. Violent knocking and extrusion during installation are prohibited. Chamfering is recommended for sharp corners to prevent edge chipping and cracking.

Moderate screwing torque is required for countersunk hole blocks to avoid magnet cracking caused by excessive force.

Select M/H/SH high-temperature resistant grades for equipment working continuously above 80℃ to prevent permanent demagnetization.

Epoxy coating is preferred for humid and outdoor environments for better anti-rust performance than ordinary zinc plating.

Standard blocks support instant stock delivery, while non-standard slotted and perforated blocks require a slightly longer lead time.

9. Our Advantages

We maintain abundant inventory of various standard block NdFeB magnets all year round. Equipped with independent precision grinding and drilling workshops, our professional engineers provide free magnetic selection and installation solution suggestions.

We offer quotation and samples for both standard in-stock blocks and customized non-standard blocks with countersunk holes and slots, supporting OEM mass customized one-stop supply.