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neodymium magnets

We offer red color magnetic Nd2Fe14B - our offer. All magnesy neodymowe on our website are in stock for immediate purchase (see the list). See the magnet price list for more details check the magnet price list

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Where to buy powerful neodymium magnet? Holders with magnets in airtight, solid enclosure are perfect for use in challenging climate conditions, including in the rain and snow see more...

magnets with holders

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UMH 25x8x45 [M5] / N38 - magnetic holder with hook

magnetic holder with hook

Catalog no 310426

GTIN: 5906301814559

5

Diameter Ø [±0,1 mm]

25 mm

Height [±0,1 mm]

45 mm

Height [±0,1 mm]

8 mm

Weight

33 g

Magnetization Direction

↑ axial

Load capacity

25 kg / 245.17 N

Coating

[NiCuNi] nickel

14.49 with VAT / pcs + price for transport

11.78 ZŁ net + 23% VAT / pcs

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UMH 25x8x45 [M5] / N38 - magnetic holder with hook
Specification/characteristics UMH 25x8x45 [M5] / N38 - magnetic holder with hook
properties
values
Cat. no.
310426
GTIN
5906301814559
Production/Distribution
Dhit sp. z o.o.
Country of origin
Poland / China / Germany
Customs code
85059029
Diameter Ø
25 mm [±0,1 mm]
Height
45 mm [±0,1 mm]
Height
8 mm [±0,1 mm]
Weight
33 g [±0,1 mm]
Magnetization Direction
↑ axial
Load capacity ~ ?
25 kg / 245.17 N
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

Holders with a hook are indispensable in large-format stores and warehouses for suspending advertisements (POS systems). In workshops and garages, they work perfectly for guiding cables or hanging work lighting.
The tip is fully demountable - you can unscrew the hook and screw in a bolt, eyelet, or other element in its place. This gives huge application flexibility and allows adapting the holder to current needs.
The given value defines the maximum load when suspended under a thick, horizontal ceiling beam. If you hang the magnet on a wall, the real capacity is approx. 20-30% of the nominal value.
The steel housing (cup) shields the magnetic field, directing all its power downwards, onto the contact surface. Additionally, steel protects the brittle magnet from cracking upon hitting the ceiling or beam.
In the bathroom or kitchen, they will work perfectly, provided they are not directly splashed with water. If you are looking for an outdoor hanger, choose a model in rubberized or plastic housing, which is tight.

Advantages and disadvantages of rare earth magnets.

Besides their tremendous magnetic power, neodymium magnets offer the following advantages:

  • They have constant strength, and over around ten years their performance decreases symbolically – ~1% (in testing),
  • Neodymium magnets are characterized by exceptionally resistant to demagnetization caused by external magnetic fields,
  • Thanks to the shimmering finish, the layer of Ni-Cu-Ni, gold, or silver-plated gives an clean appearance,
  • Magnets possess exceptionally strong magnetic induction on the outer layer,
  • 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 versatility in constructing and the ability to customize to specific needs,
  • Universal use in high-tech industry – they are commonly used in computer drives, motor assemblies, medical devices, and modern systems.
  • Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in small dimensions, which enables their usage in compact constructions

Disadvantages of NdFeB magnets:

  • They are fragile upon heavy impacts. To avoid cracks, it is worth protecting magnets using a steel holder. Such protection not only shields the magnet but also increases its resistance to damage
  • Neodymium magnets decrease their strength under the influence of heating. As soon as 80°C is exceeded, many of them start losing their power. Therefore, we recommend our special magnets marked [AH], which maintain stability even at temperatures up to 230°C
  • When exposed to humidity, magnets usually rust. For applications outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which prevent oxidation as well as corrosion.
  • Due to limitations in creating nuts and complex forms in magnets, we recommend using casing - magnetic holder.
  • Possible danger to health – tiny shards of magnets can be dangerous, if swallowed, which gains importance in the context of child safety. Furthermore, small components of these magnets can be problematic in diagnostics medical in case of swallowing.
  • Due to neodymium price, their price exceeds standard values,

Best holding force of the magnet in ideal parameterswhat contributes to it?

Holding force of 25 kg is a theoretical maximum value conducted under the following configuration:

  • on a block made of mild steel, effectively closing the magnetic field
  • with a cross-section no less than 10 mm
  • with an ground touching surface
  • with zero gap (without coatings)
  • during pulling in a direction perpendicular to the plane
  • at conditions approx. 20°C

Practical lifting capacity: influencing factors

Effective lifting capacity is affected by working environment parameters, such as (from most important):

  • Distance – existence of foreign body (paint, tape, air) interrupts the magnetic circuit, which reduces power rapidly (even by 50% at 0.5 mm).
  • Force direction – remember that the magnet holds strongest perpendicularly. Under shear forces, the capacity drops significantly, often to levels of 20-30% of the maximum value.
  • Steel thickness – too thin sheet does not accept the full field, causing part of the flux to be escaped into the air.
  • Steel grade – ideal substrate is pure iron steel. Stainless steels may attract less.
  • Plate texture – ground elements ensure maximum contact, which increases field saturation. Uneven metal weaken the grip.
  • Thermal conditions – neodymium magnets have a negative temperature coefficient. At higher temperatures they are weaker, and at low temperatures they can be stronger (up to a certain limit).

* Lifting capacity was determined by applying a polished steel plate of optimal thickness (min. 20 mm), under perpendicular detachment force, in contrast under attempts to slide the magnet the lifting capacity is smaller. In addition, even a minimal clearance {between} the magnet and the plate reduces the lifting capacity.

Safe handling of neodymium magnets

Fire risk

Combustion risk: Neodymium dust is highly flammable. Do not process magnets without safety gear as this risks ignition.

Swallowing risk

Strictly store magnets away from children. Risk of swallowing is significant, and the effects of magnets clamping inside the body are fatal.

Skin irritation risks

A percentage of the population experience a sensitization to Ni, which is the common plating for neodymium magnets. Extended handling can result in an allergic reaction. It is best to use safety gloves.

Magnetic interference

Navigation devices and mobile phones are extremely susceptible to magnetic fields. Direct contact with a strong magnet can ruin the sensors in your phone.

Health Danger

Health Alert: Strong magnets can turn off heart devices and defibrillators. Do not approach if you have electronic implants.

Fragile material

Despite the nickel coating, neodymium is delicate and not impact-resistant. Do not hit, as the magnet may crumble into hazardous fragments.

Do not overheat magnets

Monitor thermal conditions. Exposing the magnet above 80 degrees Celsius will destroy its magnetic structure and pulling force.

Electronic devices

Intense magnetic fields can destroy records on payment cards, hard drives, and other magnetic media. Keep a distance of min. 10 cm.

Pinching danger

Large magnets can smash fingers in a fraction of a second. Under no circumstances place your hand betwixt two attracting surfaces.

Handling rules

Handle with care. Rare earth magnets act from a long distance and connect with massive power, often quicker than you can react.

Attention!

Need more info? Check our post: Are neodymium magnets dangerous?

Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98