NdFeB Neodymium Block Magnets
HSMAG supplies custom neodymium block magnets in standard and high-performance grades, from micro sizes to large custom formats. We support no-MOQ orders, fast sampling, medical-capable options, and global delivery.
No MOQ — even 1 piece is possible
Up to N56 grade for maximum strength in tight spaces
Custom sizes from micro blocks to large-format magnets
Nickel, epoxy, zinc, gold, PTFE, parylene, and more
Cleanroom packaging available for sensitive applications
Standard lead time around 25 days, with express shipping often preferred
Let HSMAG help you find the right block magnet fast
Neodymium block magnets are one of the most practical shapes for real-world use. Why? Because they combine high magnetic strength, flat contact surfaces, and easy integration into assemblies, housings, fixtures, and compact devices.
At HSMAG , we produce neodymium block magnets, rare earth block magnets, rectangular neodymium magnets, square neodymium magnets, and bar-type NdFeB block magnets for customers who need more than just shelf stock. Some need tiny magnets for electronics. Some need large, powerful industrial neodymium block magnets. Others need custom coatings, special magnetization directions, or cleanroom-packed parts.
So instead of making you guess, we’ve organized common sizes and product directions below to help you start fast.
NdFeB Neodymium Block Magnets
Popular Neodymium Block Magnet Sizes
Example Size 8 × 4 × 2 mm means Length = 8 mm, Width = 4 mm, Height = 2 mm
Default Magnetization Direction By default, the last dimension is usually the magnetization direction
Example of Magnetization For 8 × 4 × 2 mm, the magnet is usually magnetized through the 2 mm thickness
Pole Surfaces In an 8 × 4 × 2 mm block magnet, the two 8 × 4 mm surfaces are the main pole faces
Standard Block Magnet Format Length × Width × Height | Example: 10 × 10 × 10 mm
Block Magnet with Hole Format Length × Width × Height × Hole Diameter | Example: 10 × 10 × 10 × D5 mm
Block Magnet with Countersunk Hole Format Length × Width × Height × Major Hole Diameter | Example: 10 × 10 × 10 × M5 mm
Default Unit Metric (mm) is used by default for order confirmation
Imperial Unit Note Imperial sizes are for reference only; if there is a small difference, please confirm by metric dimensions
Standard Length Range 1 – 200 mm
Standard Width Range 0.5 – 100 mm
Standard Height Range 0.3 – 120 mm
Largest Rectangle Block Size from Osenc 200 × 80 × 50 mm
Largest Square Block Size from Osenc 100 × 100 × 60 mm
Longest Magnetization Direction Up to 200 mm
Smallest Block Magnet Size 1 × 1 × 0.3 mm
Size Limitation Note If one dimension is very large, the other dimensions usually need to be smaller; if two dimensions are large, the thickness should not be too thin
Why choose neodymium block magnets?
If you need strong magnetic force in a clean, practical shape, neodymium block magnets are usually one of the best places to start.
Compared with many other shapes, block magnets give you:
A flat surface for stable contact
Strong holding force in a compact rectangular form
Easy installation in housings, fixtures, and assemblies
More flexibility across industrial, electronics, and OEM applications
They’re also one of the easiest magnet types to customize. At HSMAG , we can adjust the grade, dimensions, coating, magnetization direction, and quantity based on what your project actually needs — not just what happens to be in stock.
And yes, if you’re also comparing block magnets vs bar magnets vs square magnets, the good news is that these shapes often belong to the same product family. The difference is usually the proportion, the mounting space, and how the magnetic field needs to work in your design.
Let us help you choose in about a minute
Not sure which neodymium block magnet is right? No problem. Here’s a simple way to narrow it down.
If you need standard performance
We usually suggest N35 to N42 for general holding, closures, fixtures, and standard industrial use.
If you need stronger force in limited space
We usually suggest N52 neodymium block magnets. They’re a popular choice when space is tight but pull force still matters.
If your project needs the highest practical grade
Ask HSMAG about N56 neodymium block magnets. They’re a strong option for compact, high-performance applications where every bit of magnetic energy counts.
If the environment is humid or corrosive
Consider epoxy-coated neodymium block magnets or other corrosion-resistant finishes.
If the application is sensitive, technical, or medical-related
Tell us early. HSMAG can discuss special coatings, medical-capable options, and cleanroom packaging.
If fit matters as much as force
Share your drawing, tolerance target, and magnetization direction. This is where custom work really helps.
Still deciding? Great — below is the part buyers and engineers usually care about most: what exactly can be customized.
Grades and performance: what matters most?
A lot of buyers ask for the “strongest” magnet right away. We get it. But in real applications, the best magnet is not always just the highest grade.
N35 to N42
Good for general use, cost-sensitive projects, and standard holding needs.
N52
One of the most requested options for strong neodymium block magnets. It gives high magnetic strength without increasing the overall size too much.
N56
Best suited for projects that need maximum magnetic performance in the smallest possible footprint.
The right choice depends on more than grade alone. Real performance also depends on:
magnet size
air gap
steel contact surface
coating
magnetization direction
operating temperature
assembly structure
That’s why HSMAG doesn’t just sell powerful neodymium block magnets — we help match the magnet to the actual application.
Up next: coatings and packaging, which are often just as important as grade.
Coating and packaging options
A strong magnet is only useful if it fits the environment it will work in.
Common coating options
Nickel (Ni-Cu-Ni)
A common choice for general indoor use. Clean appearance and dependable protection for many standard applications.
Epoxy
A smart option when better moisture or corrosion resistance is needed.
Zinc
Useful for cost-sensitive projects where a basic protective finish is enough.
Gold
Chosen when appearance, surface requirements, or specific application needs call for it.
PTFE / Teflon
Helpful in low-friction or specialty assembly environments.
Parylene
Useful for sensitive, technical, and some medical-related applications.
Packaging options
HSMAG also supports:
standard export packaging
protective packing for magnetized products
cleanroom packaging for sensitive applications
If your project is for electronics, precision instruments, or medical-related use, let us know early. That helps HSMAG recommend the right finish and packaging from the start.
Next, let’s talk about the manufacturing side — because that’s where many suppliers start to look very different.
Built for precision, flexibility, and repeat orders
We’re not just listing magnets online. HSMAG manufactures and supports projects with real size, tolerance, and coating requirements.
Here’s what that means in practical terms:
Sizes from micro magnets around 0.2 mm to large magnets up to 300 mm
High magnetic grades up to N56
Tight tolerance capability for demanding assemblies
Stable repeat-batch consistency for ongoing supply
Support for private label and OEM-style projects
Experience serving demanding customers in electronics-related supply chains
For customers working on sensitive or higher-spec products, HSMAG can also discuss:
clean handling
cleanroom packaging
special coating requirements
custom magnetic solutions and assemblies
So if your project needs more than an off-the-shelf magnet, you’re in the right place.
And if you’re wondering where these block magnets are commonly used, here are some of the most relevant applications.
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Common uses for neodymium block magnets
Because of their flat shape and strong magnetic field, neodymium block magnets are used across a wide range of industries.
Consumer electronics
Compact magnetic parts, closures, positioning, and internal assembly use.
Precision instruments
Where stable dimensions, controlled magnetization, and dependable performance matter.
Medical devices
For applications that may require cleaner handling, better coatings, or more tightly controlled production support.
Sensors and switches
A common use for small block and rectangular NdFeB magnets.
Magnetic fixtures and positioning
Useful in workholding, assembly, locating, and light industrial setups.
Closures and hidden fastening
A great fit for products that need strong hold without visible hardware.
OEM and private-label magnetic parts
For customers building their own branded products or sourcing to print, package, or resell.
If your application isn’t listed here, don’t worry. Many custom projects start the same way: with a size, a force target, and a few design constraints.
Now let’s cover the practical questions buyers usually ask next.
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