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neodymium magnets

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UMGZ 48x24x11.5 [M8] GZ / N38 - magnetic holder external thread

magnetic holder external thread

Catalog no 190415

GTIN: 5906301813866

5

Diameter Ø [±0,1 mm]

48 mm

Height [±0,1 mm]

24 mm

Height [±0,1 mm]

11.5 mm

Weight

140 g

Load capacity

80 kg / 784.53 N

59.90 with VAT / pcs + price for transport

48.70 ZŁ net + 23% VAT / pcs

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UMGZ 48x24x11.5 [M8] GZ / N38 - magnetic holder external thread
Specification/characteristics UMGZ 48x24x11.5 [M8] GZ / N38 - magnetic holder external thread
properties
values
Cat. no.
190415
GTIN
5906301813866
Production/Distribution
Dhit sp. z o.o.
Country of origin
Poland / China / Germany
Customs code
85059029
Diameter Ø
48 mm [±0,1 mm]
Height
24 mm [±0,1 mm]
Height
11.5 mm [±0,1 mm]
Weight
140 g [±0,1 mm]
Load capacity ~ ?
80 kg / 784.53 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

A magnet with a built-in screw is great for screwing with a nut to housings, profiles, and flat bars. 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. When assembling, use a torque wrench or tighten with feeling. The magnet itself is protected by a steel cup and is very resistant to impact.
Maximum operating temperature is 80 degrees Celsius for the standard version. For furnaces, dryers, and powder coating shops, we recommend other types of magnets. Remember that even momentary overheating can weaken the holder.
Thread size (e.g., M6) is always given in the product name and technical specification. Stud length varies depending on the model (usually from 8 to 15 mm). It is a solid threaded connection, ready for use.
Thanks to shielding the sides and top, all magnet power is directed downwards, giving higher capacity than a bare magnet. This force drops very quickly with increasing distance (air gap).

Advantages as well as disadvantages of neodymium magnets.

Besides their remarkable pulling force, neodymium magnets offer the following advantages:

  • They retain full power for around ten years – the drop is just ~1% (in theory),
  • They feature excellent resistance to weakening of magnetic properties when exposed to external magnetic sources,
  • The use of an elegant finish of noble metals (nickel, gold, silver) causes the element to have aesthetics,
  • They feature high magnetic induction at the operating surface, which increases their power,
  • Thanks to resistance to high temperature, they can operate (depending on the shape) even at temperatures up to 230°C and higher...
  • Possibility of individual shaping and modifying to precise conditions,
  • Versatile presence in electronics industry – they are utilized in HDD drives, drive modules, diagnostic systems, and complex engineering applications.
  • Relatively small size with high pulling force – neodymium magnets offer high power in small dimensions, which allows their use in miniature devices

Disadvantages of neodymium magnets:

  • Susceptibility to cracking 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
  • Neodymium magnets lose 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 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 as well as corrosion.
  • Limited possibility of creating threads in the magnet and complex shapes - recommended is casing - magnetic holder.
  • Potential hazard related to microscopic parts of magnets are risky, when accidentally swallowed, which is particularly important in the aspect of protecting the youngest. It is also worth noting that small elements of these devices are able to disrupt the diagnostic process medical after entering the body.
  • Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Maximum magnetic pulling forcewhat contributes to it?

Information about lifting capacity is the result of a measurement for optimal configuration, including:

  • using a plate made of high-permeability steel, functioning as a circuit closing element
  • whose transverse dimension is min. 10 mm
  • characterized by even structure
  • without any clearance between the magnet and steel
  • during pulling in a direction vertical to the plane
  • in neutral thermal conditions

Practical lifting capacity: influencing factors

In practice, the real power depends on a number of factors, ranked from the most important:

  • Clearance – existence of any layer (paint, dirt, gap) acts as an insulator, which reduces capacity rapidly (even by 50% at 0.5 mm).
  • Pull-off angle – note that the magnet has greatest strength perpendicularly. Under shear forces, the holding force drops significantly, often to levels of 20-30% of the nominal value.
  • Steel thickness – too thin steel does not accept the full field, causing part of the flux to be escaped to the other side.
  • Metal type – not every steel attracts identically. Alloy additives worsen the attraction effect.
  • Surface condition – ground elements guarantee perfect abutment, which improves force. Rough surfaces weaken the grip.
  • Temperature – heating the magnet causes a temporary drop of force. It is worth remembering the thermal limit for a given model.

* Holding force was measured on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, whereas under shearing force the load capacity is reduced by as much as 75%. Additionally, even a slight gap {between} the magnet and the plate reduces the holding force.

Safe handling of neodymium magnets

Choking Hazard

Absolutely store magnets away from children. Choking hazard is significant, and the consequences of magnets connecting inside the body are fatal.

Shattering risk

NdFeB magnets are ceramic materials, which means they are fragile like glass. Clashing of two magnets will cause them breaking into shards.

Do not overheat magnets

Monitor thermal conditions. Exposing the magnet above 80 degrees Celsius will ruin its properties and pulling force.

Finger safety

Big blocks can smash fingers instantly. Never put your hand betwixt two strong magnets.

Threat to navigation

GPS units and mobile phones are extremely susceptible to magnetism. Close proximity with a strong magnet can permanently damage the internal compass in your phone.

Safe operation

Handle with care. Neodymium magnets attract from a distance and connect with huge force, often quicker than you can react.

Danger to pacemakers

People with a ICD must keep an safe separation from magnets. The magnetic field can interfere with the operation of the implant.

Do not drill into magnets

Fire hazard: Rare earth powder is highly flammable. Avoid machining magnets in home conditions as this risks ignition.

Nickel coating and allergies

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

Threat to electronics

Do not bring magnets close to a purse, laptop, or screen. The magnetic field can irreversibly ruin these devices and wipe information from cards.

Important!

More info about risks in the article: Magnet Safety Guide.

Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98