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Cylinder Magnets
Deep-Reach Axial Rods
Neodymium Cylinder & Rod Magnets
Engineered with an aspect ratio where length equals or exceeds diameter (L ≥ D), our sintered neodymium cylinder and rod magnets (NdFeB) project intense magnetic flux lines significantly farther through air gaps than flat disc magnets. Magnetized axially through their length with poles on the opposing flat circular ends, these high-energy rare-earth rods provide deep reaching power for reed switches, Hall-effect sensors, deep blind-hole insertions, and industrial separation assemblies.
Looking for side-to-side polarity or flat discs? If your assembly requires side-magnetized rods for rotary angle encoders or stir bars, visit our Diametrically Magnetized Magnets hub. For low-profile circular magnets where thickness is less than diameter, browse our Neodymium Disc Magnets.
Related Neodymium Geometries & Mounting Options:
Axial Length Reach
Extended magnetic length projects flux further outward across air gaps than flat discs.
Deep Hole & Tube Mounting
Ideal for press-fitting into drilled cylinders, aluminum tubes, plastic housings, or wood dowels.
Grades N35 to N52
Sintered NdFeB alloys offering surface fields up to 14,000+ Gauss for maximum trigger sensitivity.
Triple Ni-Cu-Ni Plating
Electrolytic nickel-copper-nickel protective barrier provides durability and corrosion resistance.
Filter Related Categories: Cylinder Magnets Disc Magnets (Axial) Diametric Magnets Countersunk Discs
Engineering Guide: Neodymium Cylinder & Rod Magnets
In magnetic circuit design, the aspect ratio of a permanent magnet dictates how its flux density is distributed into the surrounding air. When a cylindrical magnet has a length equal to or greater than its diameter (L ≥ D), its working point on the demagnetization curve (permeance coefficient, Pc) rises significantly. This increased magnetic length reduces self-demagnetization and allows the magnetic field to reach deeper into surrounding space than a thin disc magnet.
Geometric Comparison: Cylinders (Rods) vs. Discs
| Attribute | Cylinder / Rod Magnet | Disc Magnet |
|---|---|---|
| Aspect Ratio Definition | Length / Height ≥ Diameter (L ≥ D) | Thickness < Diameter (T < D) |
| Air-Gap Flux Projection | Deep projected reach; maintains high field strength at distance. | Flatter profile; field drops off quickly as distance increases. |
| Direct Contact Pull Force | High, but gains plateau once length exceeds diameter significantly. | Optimized for close flush-contact holding on flat steel plates. |
| Typical Mounting Method | Press-fit into drilled holes, tubular sleeves, or channel tracks. | Surface bonding, shallow mortises, or countersunk screws. |
Key Industrial & OEM Applications
- Magnetic Reed Switches & Proximity Sensors: Because cylinder magnets project a strong field outward, they reliably trigger door security sensors, liquid level floats, and pneumatic cylinder position switches across substantial gaps.
- Industrial Filtration Rods & Grates: Stacked inside stainless steel tubes to capture microscopic ferrous tramp metal and fine shavings from grain, food, chemical, and plastic processing streams.
- Deep Blind-Hole Insertion: The extended body allows cylinders to be easily seated and glued into drilled dowels, tooling fixtures, and robotic end effectors where thin discs are difficult to manipulate.
- Precision Mechanical Latches: Delivering solid catch strength across non-magnetic air gaps (such as heavy veneer or protective acrylic layers).
Frequently Asked Questions
Are these cylinder magnets magnetized through the length or across the diameter?
All products in this category are standard axially magnetized, meaning the magnetic poles are located on the flat circular ends. If you require magnets magnetized across the curved diameter for rotary encoders or stirring bars, please visit our Diametric Neodymium Magnets category.
Does doubling the length of a cylinder magnet double its holding strength?
No. When in direct contact with a steel plate, doubling the length provides diminishing returns once the length exceeds the diameter. However, doubling the length dramatically increases the reach of the magnetic field at a distance through air gaps.
What is the maximum operating temperature for neodymium cylinder magnets?
Standard grades (N35 to N52) operate reliably up to 80°C (176°F). For hot operating environments such as motors or heated tooling fixtures, CMS Magnetics also supplies high-temperature grades: M (100°C), H (120°C), and SH (150°C).
Can multiple cylinder magnets be stacked to increase power?
Yes. Stacking two or more axial cylinder magnets end-to-end combines their magnetic lengths, behaving essentially as a single longer rod magnet with deeper flux projection.