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neodymium magnets

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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

The offered product is a very strong cylindrical magnet, made from modern NdFeB material, which, at dimensions of Ø15x4 mm, guarantees the highest energy density. This specific item boasts an accuracy of ±0.1mm and professional build quality, making it a perfect solution for professional engineers and designers. As a magnetic rod with impressive force (approx. 3.32 kg), this product is in stock from our European logistics center, ensuring lightning-fast order fulfillment. Moreover, its Ni-Cu-Ni coating secures it against corrosion in standard operating conditions, ensuring an aesthetic appearance and durability for years.
This model is ideal for building generators, advanced Hall effect sensors, and efficient filters, where maximum induction on a small surface counts. Thanks to the pull force of 32.56 N with a weight of only 5.3 g, this cylindrical magnet is indispensable in electronics 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 stability in industry, anaerobic resins are used, which are safe for nickel and fill the gap, guaranteeing high repeatability of the connection.
Grade N38 is the most frequently chosen standard for industrial neodymium magnets, offering a great economic balance and operational stability. 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 warehouse.
This model is characterized by dimensions Ø15x4 mm, which, at a weight of 5.3 g, makes it an element with impressive magnetic energy density. The key parameter here is the holding force amounting to approximately 3.32 kg (force ~32.56 N), which, with such compact dimensions, proves the high power of the NdFeB material. The product has a [NiCuNi] coating, which protects the surface against oxidation, 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.

Advantages and disadvantages of NdFeB magnets.

Apart from their consistent magnetism, neodymium magnets have these key benefits:

  • They retain full power for around 10 years – the drop is just ~1% (based on simulations),
  • They are noted for resistance to demagnetization induced by presence of other magnetic fields,
  • In other words, due to the aesthetic surface of nickel, the element gains visual value,
  • Neodymium magnets generate maximum magnetic induction on a small area, which allows for strong attraction,
  • Due to their durability and thermal resistance, neodymium magnets are capable of operate (depending on the form) even at high temperatures reaching 230°C or more...
  • Thanks to the option of flexible shaping and customization to unique requirements, magnetic components can be produced in a wide range of shapes and sizes, which expands the range of possible applications,
  • Universal use in modern technologies – they are utilized in HDD drives, electric motors, medical devices, as well as technologically advanced constructions.
  • Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Problematic aspects of neodymium magnets and ways of using them

  • They are prone to damage upon too strong impacts. To avoid cracks, it is worth securing magnets in special housings. Such protection not only protects the magnet but also improves its resistance to damage
  • We warn that neodymium magnets can lose their strength at high temperatures. To prevent this, we suggest our specialized [AH] magnets, which work effectively even at 230°C.
  • When exposed to humidity, magnets start to rust. For applications outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which prevent oxidation and corrosion.
  • Due to limitations in realizing threads and complicated forms in magnets, we recommend using cover - magnetic holder.
  • Potential hazard resulting from small fragments of magnets can be dangerous, if swallowed, which is particularly important in the context of child safety. It is also worth noting that small components of these magnets are able to disrupt the diagnostic process medical after entering the body.
  • Due to complex production process, their price is higher than average,

Detachment force of the magnet in optimal conditionswhat affects it?

Holding force of 3.32 kg is a result of laboratory testing executed under specific, ideal conditions:

  • on a block made of mild steel, effectively closing the magnetic field
  • whose thickness reaches at least 10 mm
  • characterized by lack of roughness
  • under conditions of no distance (metal-to-metal)
  • for force acting at a right angle (pull-off, not shear)
  • in temp. approx. 20°C

Lifting capacity in practice – influencing factors

During everyday use, the real power is determined by a number of factors, listed from the most important:

  • Space between surfaces – even a fraction of a millimeter of separation (caused e.g. by varnish or unevenness) diminishes the magnet efficiency, often by half at just 0.5 mm.
  • Load vector – maximum parameter is reached only during perpendicular pulling. The force required to slide of the magnet along the surface is usually several times lower (approx. 1/5 of the lifting capacity).
  • Metal thickness – the thinner the sheet, the weaker the hold. Magnetic flux passes through the material instead of generating force.
  • Material type – the best choice is pure iron steel. Stainless steels may have worse magnetic properties.
  • Surface condition – smooth surfaces guarantee perfect abutment, which increases force. Rough surfaces weaken the grip.
  • Temperature – temperature increase results in weakening of induction. Check the maximum operating temperature for a given model.

* Lifting capacity testing was conducted on a smooth plate of suitable thickness, under a perpendicular pulling force, in contrast under parallel forces the lifting capacity is smaller. Moreover, even a minimal clearance {between} the magnet and the plate reduces the holding force.

Safety rules for work with NdFeB magnets

Caution required

Before use, read the rules. Uncontrolled attraction can break the magnet or hurt your hand. Think ahead.

Crushing force

Risk of injury: The pulling power is so great that it can result in hematomas, pinching, and even bone fractures. Protective gloves are recommended.

Magnets are brittle

Neodymium magnets are ceramic materials, meaning they are prone to chipping. Collision of two magnets will cause them cracking into shards.

Threat to electronics

Avoid bringing magnets near a purse, laptop, or screen. The magnetic field can destroy these devices and erase data from cards.

Do not drill into magnets

Dust generated during machining of magnets is self-igniting. Do not drill into magnets unless you are an expert.

Skin irritation risks

It is widely known that the nickel plating (the usual finish) is a potent allergen. If your skin reacts to metals, prevent direct skin contact and select encased magnets.

Pacemakers

People with a heart stimulator must keep an large gap from magnets. The magnetism can disrupt the operation of the life-saving device.

Threat to navigation

Navigation devices and mobile phones are highly susceptible to magnetism. Direct contact with a powerful NdFeB magnet can ruin the sensors in your phone.

Maximum temperature

Keep cool. Neodymium magnets are susceptible to temperature. If you require resistance above 80°C, look for HT versions (H, SH, UH).

Choking Hazard

Neodymium magnets are not suitable for play. Eating a few magnets may result in them pinching intestinal walls, which constitutes a critical condition and necessitates urgent medical intervention.

Caution!

Looking for details? Check our post: Why are neodymium magnets dangerous?

Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98