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UMGW 25x17x8 [M5] GW / N38 - magnetic holder internal thread

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UMGW 25x17x8 [M5] GW / N38 - magnetic holder internal thread

magnetic holder internal thread

Catalog no 180317

GTIN: 5906301813736

Diameter Ø [±0,1 mm]

25 mm

Height [±0,1 mm]

17 mm

Height [±0,1 mm]

8 mm

Weight

25.4 g

Load capacity

17 kg / 166.71 N

11.91 ZŁ with VAT / pcs + price for transport

9.68 ZŁ net + 23% VAT / pcs

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UMGW 25x17x8 [M5] GW / N38 - magnetic holder internal thread

Specification/characteristics UMGW 25x17x8 [M5] GW / N38 - magnetic holder internal thread

properties

values

Cat. no.

180317

GTIN

5906301813736

Production/Distribution

Dhit sp. z o.o.

Country of origin

Poland / China / Germany

Customs code

85059029

Diameter Ø

25 mm [±0,1 mm]

Height

17 mm [±0,1 mm]

Height

8 mm [±0,1 mm]

Weight

25.4 g [±0,1 mm]

Load capacity ~ ?

17 kg / 166.71 N

Manufacturing Tolerance

± 0.1 mm

Magnetic properties of material N38

properties

values

units

coercivity bHc ?

860-915

kA/m

coercivity bHc ?

10.8-11.5

kOe

energy density [Min. - Max.] ?

287-303

BH max KJ/m

energy density [Min. - Max.] ?

36-38

BH max MGOe

remenance Br [Min. - Max.] ?

12.2-12.6

kGs

remenance Br [Min. - Max.] ?

1220-1260

actual internal force iHc

≥ 955

kA/m

actual internal force iHc

≥ 12

kOe

max. temperature ?

≤ 80

°C

Physical properties of NdFeB

properties

values

units

Vickers hardness

≥550

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

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Mounting bases with magnets featuring internal thread are versatile tools, used in manufacturing and everyday uses, e.g. in automotive. They consist of a magnetic core, usually NdFeB, enclosed within a metal housing, covered with zinc to prevent rusting. The female thread, available in sizes from M4 to M8, enables insertion of screws, which facilitates installation of various items, like nameplates, instruments, or lamps. They work via a strong magnetic field, which concentrates in the contact area, providing load capacity from 1.3 kg to 60 kg, depending on mount size. These are particularly helpful in the automotive industry, for example, for attaching body panels, and also in marketing, for poster placement. Certain types have a rubber coating, e.g. in black or yellow colors, helping prevent surface damage and increases resistance to dampness. Benefits cover great strength, simple mounting thanks to the thread, as well as the option to move massive steel components. However, the grip strength relies on surface thickness, type of steel, and the gap between holder and object. Preventing mechanical shocks is crucial, since neodymium magnets are fragile, and over-tightening the bolt can cause damage. In addition, a magnetic zone may interfere with electronics, such as smartphones or magnetic cards, therefore mounts should be stored away from those devices. It is recommended to choose holders from reputable manufacturers, to ensure high quality and safe use during operation.

Advantages as well as disadvantages of neodymium magnets NdFeB.

Besides their durability, neodymium magnets are valued for these benefits:

Their strength remains stable, and after approximately ten years, it drops only by ~1% (theoretically),
They remain magnetized despite exposure to strong external fields,
By applying a shiny layer of nickel, the element gains a sleek look,
They have extremely strong magnetic induction on the surface of the magnet,
They are suitable for high-temperature applications, operating effectively at 230°C+ due to advanced heat resistance and form-specific properties,
The ability for precise shaping or adaptation to individual needs – neodymium magnets can be manufactured in multiple variants of geometries, which extends the scope of their use cases,
Important function in new technology industries – they are utilized in HDDs, electric motors, clinical machines as well as sophisticated instruments,
Compactness – despite their small size, they deliver powerful magnetism, making them ideal for precision applications

Disadvantages of magnetic elements:

They are prone to breaking when subjected to a heavy impact. If the magnets are exposed to mechanical hits, they should be placed in a protective case. The steel housing, in the form of a holder, protects the magnet from breakage while also increases its overall strength,
They lose strength at extreme temperatures. Most neodymium magnets experience permanent degradation in strength when heated above 80°C (depending on the shape and height). However, we offer special variants with high temperature resistance that can operate up to 230°C or higher,
They rust in a moist environment. If exposed to rain, we recommend using encapsulated magnets, such as those made of rubber,
Limited ability to create internal holes in the magnet – the use of a magnetic holder is recommended,
Health risk due to small fragments may arise, when consumed by mistake, which is notable in the health of young users. Additionally, small elements from these assemblies can interfere with diagnostics if inside the body,
High unit cost – neodymium magnets are more expensive than other types of magnets (e.g., ferrite), which may limit large-scale applications

Precautions

It is important to keep neodymium magnets away from children.

Remember that neodymium magnets are not toys. Be cautious and make sure no child plays with them. In the case of swallowing multiple magnets simultaneously, they can attract to each other through the intestinal walls. In the worst case scenario, this can lead to death.

Neodymium magnets can demagnetize at high temperatures.

In certain circumstances, Neodymium magnets may experience demagnetization when subjected to high temperatures.

Neodymium magnetic are highly susceptible to damage, leading to breaking.

Magnets made of neodymium are extremely fragile, and by joining them in an uncontrolled manner, they will break. Neodymium magnetic are made of metal and coated with a shiny nickel, but they are not as durable as steel. In the event of a collision between two magnets, there may be a scattering of fragments in different directions. Protecting your eyes is crucial in such a situation.

Neodymium magnets are over 10 times stronger than ferrite magnets (the ones in speakers), and their strength can surprise you.

Familiarize yourself with our information to correctly handle these magnets and avoid significant injuries to your body and prevent damage to the magnets.

Dust and powder from neodymium magnets are flammable.

Avoid drilling or mechanical processing of neodymium magnets. Once crushed into fine powder or dust, this material becomes highly flammable.

Make sure not to bring neodymium magnets close to the TV, wallet, and computer HDD.

Strong fields generated by neodymium magnets can damage magnetic storage media such as floppy disks, credit cards, magnetic ID cards, cassette tapes, video tapes, or other similar devices. They can also damage televisions, VCRs, computer monitors, and CRT displays. You should especially avoid placing neodymium magnets near electronic devices.

Avoid bringing neodymium magnets close to a phone or GPS.

Magnetic fields can interfere with compasses and magnetometers used in aviation and maritime navigation, as well as internal compasses of smartphones and GPS devices. There are neodymium magnets in every smartphone, for example, in the microphone and speakers.

The magnet is coated with nickel. Therefore, exercise caution if you have an allergy.

Studies show a small percentage of people have allergies to certain metals, including nickel. An allergic reaction often manifests as skin redness and rash. If you have a nickel allergy, try wearing gloves or avoid direct contact with nickel-plated neodymium magnets.

Neodymium magnets can attract to each other due to their immense internal force, causing the skin and other body parts to get pinched and resulting in significant swellings.

Magnets will attract each other within a distance of several to around 10 cm from each other. Remember not to put fingers between magnets or in their path when they attract. Magnets, depending on their size, are able even cut off a finger or there can be a serious pressure or a fracture.

Neodymium magnets should not be near people with pacemakers.

Neodymium magnets generate strong magnetic fields. As a result, they interfere with the operation of a pacemaker. This is because many of these devices are equipped with a function that deactivates the device in a magnetic field.

Exercise caution!

So you are aware of why neodymium magnets are so dangerous, read the article titled How very dangerous are strong neodymium magnets?.