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neodymium magnets

We offer red color magnets Nd2Fe14B - our store's offer. Practically all "neodymium magnets" on our website are available for immediate purchase (check the list). See the magnet price list for more details see the magnet price list

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UMGZ 20x15x7 [M4] GZ / N38 - magnetic holder external thread

magnetic holder external thread

Catalog no 190322

GTIN: 5906301813811

5

Diameter Ø [±0,1 mm]

20 mm

Height [±0,1 mm]

15 mm

Height [±0,1 mm]

7 mm

Weight

14 g

Load capacity

9 kg / 88.26 N

7.22 with VAT / pcs + price for transport

5.87 ZŁ net + 23% VAT / pcs

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UMGZ 20x15x7 [M4] GZ / N38 - magnetic holder external thread
Specification/characteristics UMGZ 20x15x7 [M4] GZ / N38 - magnetic holder external thread
properties
values
Cat. no.
190322
GTIN
5906301813811
Production/Distribution
Dhit sp. z o.o.
Country of origin
Poland / China / Germany
Customs code
85059029
Diameter Ø
20 mm [±0,1 mm]
Height
15 mm [±0,1 mm]
Height
7 mm [±0,1 mm]
Weight
14 g [±0,1 mm]
Load capacity ~ ?
9 kg / 88.26 N
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

It is a ready-made mounting element that allows quick creation of a magnetic point. Just pass the thread through the hole in the element and tighten the nut on the other side. They are commonly used in machine building, exhibition stands, lighting, and advertising.
The screw is solidly seated in the cup, however, moderation must be maintained when tightening the nut. Do not use the magnet as a structural bolt transferring huge mechanical loads in shear. The magnet itself is protected by a steel cup and is very resistant to impact.
Above this temperature, the magnet may irreversibly lose some of its power. For furnaces, dryers, and powder coating shops, we recommend other types of magnets. Remember that even momentary overheating can weaken the holder.
Holders are equipped with standard metric threads (e.g., M4, M6, M8, M10). Ensure thread length is sufficient to pass through the hole in your material and tighten the nut. The thread is made of galvanized steel, ensuring corrosion resistance.
Yes, the steel housing (cup) focuses the magnetic field, significantly increasing attraction force on the active side. It is a solution optimized for strong holding with direct contact, not attracting from afar.

Pros and cons of rare earth magnets.

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

  • They retain attractive force for around 10 years – the drop is just ~1% (based on simulations),
  • Neodymium magnets are remarkably resistant to loss of magnetic properties caused by external interference,
  • A magnet with a shiny silver surface looks better,
  • Magnetic induction on the working part of the magnet remains maximum,
  • Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and are able to act (depending on the shape) even at a temperature of 230°C or more...
  • Considering the option of accurate forming and customization to unique projects, magnetic components can be created in a variety of geometric configurations, which increases their versatility,
  • Key role in advanced technology sectors – they serve a role in hard drives, drive modules, medical devices, as well as other advanced devices.
  • Relatively small size with high pulling force – neodymium magnets offer high power in small dimensions, which allows their use in small systems

Disadvantages of NdFeB magnets:

  • To avoid cracks under impact, we recommend using special steel housings. Such a solution secures the magnet and simultaneously increases its durability.
  • Neodymium magnets decrease their power 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 durability even at temperatures up to 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 secure oxidation as well as corrosion.
  • Due to limitations in creating threads and complex forms in magnets, we recommend using casing - magnetic mount.
  • Health risk related to microscopic parts of magnets are risky, in case of ingestion, which becomes key in the aspect of protecting the youngest. Furthermore, small elements of these products are able to disrupt the diagnostic process medical when they are in the body.
  • Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Breakaway strength of the magnet in ideal conditionswhat it depends on?

The lifting capacity listed is a measurement result executed under standard conditions:

  • on a base made of structural steel, optimally conducting the magnetic flux
  • whose thickness equals approx. 10 mm
  • with a surface perfectly flat
  • under conditions of ideal adhesion (metal-to-metal)
  • during detachment in a direction perpendicular to the plane
  • at ambient temperature approx. 20 degrees Celsius

Determinants of lifting force in real conditions

During everyday use, the actual lifting capacity is determined by a number of factors, ranked from most significant:

  • Gap between surfaces – every millimeter of distance (caused e.g. by veneer or dirt) drastically reduces the magnet efficiency, often by half at just 0.5 mm.
  • Load vector – maximum parameter is available only during pulling at a 90° angle. The resistance to sliding of the magnet along the surface is standardly many times lower (approx. 1/5 of the lifting capacity).
  • Element thickness – for full efficiency, the steel must be adequately massive. Thin sheet restricts the lifting capacity (the magnet "punches through" it).
  • Steel type – mild steel attracts best. Higher carbon content lower magnetic properties and lifting capacity.
  • Surface finish – full contact is obtained only on polished steel. Rough texture create air cushions, weakening the magnet.
  • Operating temperature – neodymium magnets have a sensitivity to temperature. When it is hot they lose power, and at low temperatures they can be stronger (up to a certain limit).

* Holding force was measured on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, whereas under parallel forces the holding force is lower. Moreover, even a slight gap {between} the magnet’s surface and the plate lowers the lifting capacity.

Precautions when working with NdFeB magnets

Keep away from electronics

A strong magnetic field interferes with the operation of magnetometers in smartphones and navigation systems. Maintain magnets close to a device to prevent damaging the sensors.

Health Danger

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

Sensitization to coating

Medical facts indicate that nickel (the usual finish) is a potent allergen. If your skin reacts to metals, refrain from direct skin contact or opt for versions in plastic housing.

Magnets are brittle

Despite metallic appearance, the material is brittle and cannot withstand shocks. Avoid impacts, as the magnet may crumble into hazardous fragments.

Immense force

Handle magnets with awareness. Their powerful strength can shock even professionals. Stay alert and respect their power.

Fire risk

Fire warning: Rare earth powder is explosive. Do not process magnets in home conditions as this risks ignition.

No play value

Only for adults. Tiny parts can be swallowed, causing intestinal necrosis. Keep away from kids and pets.

Permanent damage

Do not overheat. NdFeB magnets are sensitive to temperature. If you require resistance above 80°C, inquire about HT versions (H, SH, UH).

Crushing risk

Watch your fingers. Two large magnets will snap together instantly with a force of massive weight, crushing everything in their path. Be careful!

Keep away from computers

Very strong magnetic fields can erase data on credit cards, hard drives, and storage devices. Keep a distance of min. 10 cm.

Caution!

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