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neodymium magnets

We offer blue color magnets Nd2Fe14B - our store's offer. Practically all magnesy on our website are available for immediate purchase (see the list). Check out the magnet pricing for more details check the magnet price list

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magnetic holders

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UMH 20x7x35 [M4] / N38 - magnetic holder with hook

magnetic holder with hook

Catalog no 310425

GTIN: 5906301814542

5

Diameter Ø

20 mm [±1 mm]

Height

35 mm [±1 mm]

Height

7 mm [±1 mm]

Weight

21 g

Magnetization Direction

↑ axial

Load capacity

14.5 kg / 142.2 N

Coating

[NiCuNi] nickel

8.59 with VAT / pcs + price for transport

6.98 ZŁ net + 23% VAT / pcs

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Lifting power along with shape of a neodymium magnet can be tested using our power calculator.

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UMH 20x7x35 [M4] / N38 - magnetic holder with hook
Specification/characteristics UMH 20x7x35 [M4] / N38 - magnetic holder with hook
properties
values
Cat. no.
310425
GTIN
5906301814542
Production/Distribution
Dhit sp. z o.o.
Country of origin
Poland / China / Germany
Customs code
85059029
Diameter Ø
20 mm [±1 mm]
Height
35 mm [±1 mm]
Height
7 mm [±1 mm]
Weight
21 g
Magnetization Direction
↑ axial
Load capacity ~ ?
14.5 kg / 142.2 N
Coating
[NiCuNi] nickel
Manufacturing Tolerance
±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

They serve to create mobile suspension points without the need to drill holes in beams. You can use them to organize wires, hang tools, or clothes on metal racks.
Yes, the hook is an element screwed into a bushing with a metric thread (e.g., M4, M5, M6 - check description). This gives huge application flexibility and allows adapting the holder to current needs.
The nominal capacity (e.g., 14.5 kg) refers to perpendicular (vertical) force when mounted on the ceiling. For heavy ceiling ads or tools, we recommend choosing a magnet with a considerable power reserve.
Thanks to the metal cover, attraction force is concentrated, which significantly increases capacity compared to a bare magnet. The housing ensures mechanical durability, which is important in industrial and assembly conditions.
Standard holders are coated with a layer of nickel or zinc, which protects them from corrosion indoors. If you are looking for an outdoor hanger, choose a model in rubberized or plastic housing, which is tight.

Pros as well as cons of rare earth magnets.

Apart from their strong power, neodymium magnets have these key benefits:

  • Their magnetic field remains stable, and after around 10 years it drops only by ~1% (theoretically),
  • They retain their magnetic properties even under strong external field,
  • The use of an elegant finish of noble metals (nickel, gold, silver) causes the element to be more visually attractive,
  • Neodymium magnets achieve maximum magnetic induction on a small surface, which allows for strong attraction,
  • 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...
  • Possibility of detailed shaping as well as adjusting to defined requirements,
  • Wide application in modern technologies – they are commonly used in hard drives, drive modules, medical devices, as well as multitasking production systems.
  • Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in small dimensions, which makes them useful in small systems

Disadvantages of NdFeB magnets:

  • Brittleness is one of their disadvantages. Upon strong impact they can fracture. We recommend keeping them in a strong case, which not only secures them against impacts but also raises their durability
  • When exposed to high temperature, neodymium magnets suffer a drop in force. Often, when the temperature exceeds 80°C, their strength decreases (depending on the size and shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
  • When exposed to humidity, magnets start to rust. To use them in conditions outside, it is recommended to use protective magnets, such as those in rubber or plastics, which secure oxidation and corrosion.
  • Limited possibility of producing threads in the magnet and complex forms - preferred is cover - mounting mechanism.
  • Potential hazard related to microscopic parts of magnets can be dangerous, when accidentally swallowed, which becomes key in the context of child safety. Additionally, tiny parts of these magnets are able to disrupt the diagnostic process medical in case of swallowing.
  • Due to expensive raw materials, their price is relatively high,

Optimal lifting capacity of a neodymium magnetwhat affects it?

Information about lifting capacity is the result of a measurement for ideal contact conditions, including:

  • with the use of a sheet made of low-carbon steel, ensuring maximum field concentration
  • whose transverse dimension equals approx. 10 mm
  • characterized by lack of roughness
  • with zero gap (no paint)
  • under axial force vector (90-degree angle)
  • at room temperature

Lifting capacity in practice – influencing factors

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

  • Distance – the presence of foreign body (paint, tape, gap) interrupts the magnetic circuit, which reduces capacity rapidly (even by 50% at 0.5 mm).
  • Force direction – remember that the magnet holds strongest perpendicularly. Under sliding down, the capacity drops drastically, often to levels of 20-30% of the nominal value.
  • Element thickness – to utilize 100% power, the steel must be sufficiently thick. Thin sheet restricts the attraction force (the magnet "punches through" it).
  • Steel type – mild steel gives the best results. Alloy steels decrease magnetic permeability and holding force.
  • Smoothness – full contact is obtained only on smooth steel. Rough texture create air cushions, weakening the magnet.
  • Temperature – temperature increase causes a temporary drop of induction. It is worth remembering the thermal limit for a given model.

* Lifting capacity was assessed by applying a polished steel plate of suitable thickness (min. 20 mm), under perpendicular pulling force, in contrast under parallel forces the lifting capacity is smaller. Additionally, even a slight gap {between} the magnet and the plate reduces the lifting capacity.

Safety rules for work with neodymium magnets

Fire risk

Dust created during grinding of magnets is combustible. Do not drill into magnets unless you are an expert.

Health Danger

For implant holders: Powerful magnets disrupt electronics. Keep at least 30 cm distance or ask another person to handle the magnets.

Keep away from electronics

A strong magnetic field negatively affects the functioning of compasses in smartphones and GPS navigation. Maintain magnets near a device to avoid damaging the sensors.

Permanent damage

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

Electronic hazard

Avoid bringing magnets close to a wallet, computer, or TV. The magnetism can destroy these devices and wipe information from cards.

Sensitization to coating

Warning for allergy sufferers: The nickel-copper-nickel coating consists of nickel. If an allergic reaction appears, cease working with magnets and wear gloves.

Magnet fragility

Despite the nickel coating, the material is delicate and cannot withstand shocks. Do not hit, as the magnet may crumble into sharp, dangerous pieces.

Keep away from children

Product intended for adults. Small elements pose a choking risk, leading to intestinal necrosis. Store out of reach of kids and pets.

Caution required

Use magnets consciously. Their powerful strength can surprise even experienced users. Be vigilant and respect their power.

Bodily injuries

Risk of injury: The pulling power is so immense that it can result in blood blisters, pinching, and broken bones. Use thick gloves.

Safety First!

Looking for details? Read our article: Are neodymium magnets dangerous?

Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98