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neodymium magnets

We provide blue color magnets Nd2Fe14B - our store's offer. Practically all "neodymium magnets" in our store are in stock for immediate delivery (see the list). Check out the magnet price list for more details see the magnet price list

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MW 15x4 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010030

GTIN: 5906301810292

5

Diameter Ø [±0,1 mm]

15 mm

Height [±0,1 mm]

4 mm

Weight

5.3 g

Magnetization Direction

↑ axial

Load capacity

3.32 kg / 32.56 N

Magnetic Induction

291.60 mT

Coating

[NiCuNi] nickel

1.968 with VAT / pcs + price for transport

1.600 ZŁ net + 23% VAT / pcs

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MW 15x4 / N38 - cylindrical magnet
Specification/characteristics MW 15x4 / N38 - cylindrical magnet
properties
values
Cat. no.
010030
GTIN
5906301810292
Production/Distribution
Dhit sp. z o.o.
Country of origin
Poland / China / Germany
Customs code
85059029
Diameter Ø
15 mm [±0,1 mm]
Height
4 mm [±0,1 mm]
Weight
5.3 g [±0,1 mm]
Magnetization Direction
↑ axial
Load capacity ~ ?
3.32 kg / 32.56 N
Magnetic Induction ~ ?
291.60 mT
Coating
[NiCuNi] nickel
Manufacturing Tolerance
± 0.1 mm

Magnetic properties of material N38

properties
values
units
remenance Br [Min. - Max.] ?
12.2-12.6
kGs
remenance Br [Min. - Max.] ?
1220-1260
T
coercivity bHc ?
10.8-11.5
kOe
coercivity bHc ?
860-915
kA/m
actual internal force iHc
≥ 12
kOe
actual internal force iHc
≥ 955
kA/m
energy density [Min. - Max.] ?
36-38
BH max MGOe
energy density [Min. - Max.] ?
287-303
BH max KJ/m
max. temperature ?
≤ 80
°C

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

properties
values
units
Vickers hardness
≥550
Hv
Density
≥7.4
g/cm3
Curie Temperature TC
312 - 380
°C
Curie Temperature TF
593 - 716
°F
Specific resistance
150
μΩ⋅Cm
Bending strength
250
Mpa
Compressive strength
1000~1100
Mpa
Thermal expansion parallel (∥) to orientation (M)
(3-4) x 106
°C-1
Thermal expansion perpendicular (⊥) to orientation (M)
-(1-3) x 10-6
°C-1
Young's modulus
1.7 x 104
kg/mm²

Shopping tips

This product is an exceptionally strong cylinder magnet, composed of durable NdFeB material, which, at dimensions of Ø15x4 mm, guarantees maximum efficiency. This specific item boasts high dimensional repeatability and professional build quality, making it an ideal solution for the most demanding engineers and designers. As a cylindrical magnet with significant force (approx. 3.32 kg), this product is in stock from our European logistics center, ensuring rapid order fulfillment. Moreover, its Ni-Cu-Ni coating shields it against corrosion in typical operating conditions, guaranteeing an aesthetic appearance and durability for years.
It finds application in modeling, advanced automation, and broadly understood industry, serving as a fastening or actuating element. Thanks to the pull force of 32.56 N with a weight of only 5.3 g, this cylindrical magnet is indispensable in miniature devices and wherever every gram matters.
Since our magnets have a tolerance of ±0.1mm, the recommended way is to glue them into holes with a slightly larger diameter (e.g., 15.1 mm) using epoxy glues. To ensure long-term durability in industry, anaerobic resins are used, which are safe for nickel and fill the gap, guaranteeing high repeatability of the connection.
Magnets NdFeB grade N38 are suitable for the majority of applications in modeling and machine building, where excessive miniaturization with maximum force is not required. If you need the strongest magnets in the same volume (Ø15x4), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard in continuous sale in our store.
This model is characterized by dimensions Ø15x4 mm, which, at a weight of 5.3 g, makes it an element with high magnetic energy density. The key parameter here is the lifting capacity amounting to approximately 3.32 kg (force ~32.56 N), which, with such defined dimensions, proves the high grade of the NdFeB material. The product has a [NiCuNi] coating, which secures it against external factors, giving it an aesthetic, silvery shine.
Standardly, the magnetic axis runs through the center of the cylinder, causing the greatest attraction force to occur on the bases with a diameter of 15 mm. Thanks to this, the magnet can be easily glued into a hole and achieve a strong field on the front surface. On request, we can also produce versions magnetized through the diameter if your project requires it.

Strengths and weaknesses of rare earth magnets.

In addition to their magnetic efficiency, neodymium magnets provide the following advantages:

  • Their strength is maintained, and after approximately ten years it drops only by ~1% (theoretically),
  • They maintain their magnetic properties even under strong external field,
  • Thanks to the smooth finish, the surface of Ni-Cu-Ni, gold-plated, or silver-plated gives an visually attractive appearance,
  • Magnets are characterized by impressive magnetic induction on the outer side,
  • Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their form) at temperatures up to 230°C and above...
  • Thanks to the possibility of accurate shaping and customization to unique requirements, NdFeB magnets can be produced in a wide range of shapes and sizes, which expands the range of possible applications,
  • Significant place in innovative solutions – they are commonly used in hard drives, electromotive mechanisms, medical equipment, also industrial machines.
  • Compactness – despite small sizes they generate large force, making them ideal for precision applications

Disadvantages of NdFeB magnets:

  • Susceptibility to cracking is one of their disadvantages. Upon strong impact they can fracture. We advise keeping them in a steel housing, which not only protects them against impacts but also increases their durability
  • When exposed to high temperature, neodymium magnets experience a drop in force. Often, when the temperature exceeds 80°C, their strength decreases (depending on the size, as well as shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
  • Magnets exposed to a humid environment can rust. Therefore while using outdoors, we suggest using water-impermeable magnets made of rubber, plastic or other material resistant to moisture
  • Due to limitations in realizing nuts and complicated forms in magnets, we recommend using cover - magnetic mount.
  • Health risk related to microscopic parts of magnets are risky, in case of ingestion, which gains importance in the context of child health protection. Additionally, small elements of these devices can be problematic in diagnostics medical after entering the body.
  • Due to expensive raw materials, their price exceeds standard values,

Breakaway strength of the magnet in ideal conditionswhat affects it?

The load parameter shown concerns the peak performance, obtained under optimal environment, specifically:

  • using a sheet made of mild steel, serving as a magnetic yoke
  • whose thickness is min. 10 mm
  • with a surface free of scratches
  • under conditions of no distance (surface-to-surface)
  • for force acting at a right angle (pull-off, not shear)
  • in temp. approx. 20°C

What influences lifting capacity in practice

Holding efficiency is affected by working environment parameters, mainly (from most important):

  • Distance – existence of any layer (paint, tape, air) interrupts the magnetic circuit, which lowers power steeply (even by 50% at 0.5 mm).
  • Load vector – maximum parameter is available only during perpendicular pulling. The force required to slide of the magnet along the plate is typically several times smaller (approx. 1/5 of the lifting capacity).
  • Element thickness – for full efficiency, the steel must be adequately massive. Thin sheet limits the attraction force (the magnet "punches through" it).
  • Metal type – different alloys reacts the same. Alloy additives worsen the attraction effect.
  • Plate texture – ground elements guarantee perfect abutment, which improves field saturation. Rough surfaces reduce efficiency.
  • Heat – neodymium magnets have a sensitivity to temperature. At higher temperatures they are weaker, and at low temperatures they can be stronger (up to a certain limit).

* Lifting capacity was measured using a polished steel plate of optimal thickness (min. 20 mm), under perpendicular detachment force, whereas under parallel forces the lifting capacity is smaller. In addition, even a minimal clearance {between} the magnet’s surface and the plate reduces the load capacity.

Safety rules for work with NdFeB magnets

Demagnetization risk

Standard neodymium magnets (grade N) undergo demagnetization when the temperature exceeds 80°C. Damage is permanent.

Risk of cracking

NdFeB magnets are ceramic materials, which means they are fragile like glass. Collision of two magnets leads to them shattering into shards.

ICD Warning

Patients with a heart stimulator should keep an large gap from magnets. The magnetism can interfere with the functioning of the implant.

Flammability

Drilling and cutting of NdFeB material carries a risk of fire risk. Magnetic powder reacts violently with oxygen and is hard to extinguish.

Conscious usage

Exercise caution. Rare earth magnets act from a distance and connect with huge force, often faster than you can react.

Magnetic media

Equipment safety: Strong magnets can damage payment cards and sensitive devices (heart implants, medical aids, mechanical watches).

Phone sensors

Note: neodymium magnets generate a field that interferes with precision electronics. Keep a separation from your mobile, tablet, and GPS.

Finger safety

Pinching hazard: The attraction force is so great that it can cause hematomas, pinching, and broken bones. Use thick gloves.

Sensitization to coating

Certain individuals experience a hypersensitivity to Ni, which is the typical protective layer for NdFeB magnets. Extended handling can result in a rash. We strongly advise wear protective gloves.

Adults only

These products are not toys. Eating a few magnets may result in them attracting across intestines, which constitutes a critical condition and requires immediate surgery.

Danger!

Need more info? Check our post: Why are neodymium magnets dangerous?

Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98