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UMGW 20x15x7 [M4] GW / N38 - magnetic holder internal thread

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UMGW 20x15x7 [M4] GW / N38 - magnetic holder internal thread

magnetic holder internal thread

Catalog no 180316

GTIN: 5906301813729

Diameter Ø [±0,1 mm]

20 mm

Height [±0,1 mm]

15 mm

Height [±0,1 mm]

7 mm

Weight

15.5 g

Load capacity

9 kg / 88.26 N

6.49 ZŁ with VAT / pcs + price for transport

5.28 ZŁ net + 23% VAT / pcs

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UMGW 20x15x7 [M4] GW / N38 - magnetic holder internal thread

Specification/characteristics UMGW 20x15x7 [M4] GW / N38 - magnetic holder internal thread

properties

values

Cat. no.

180316

GTIN

5906301813729

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

15.5 g [±0,1 mm]

Load capacity ~ ?

9 kg / 88.26 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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Magnetic holders featuring internal thread are versatile tools, applied across industrial as well as household uses, such as automotive. They contain a magnetic core, typically neodymium, enclosed in a metal shell, coated with zinc for corrosion protection. The internal thread, ranging from M3 to M10, enables mounting bolts, which simplifies installation of different items, like signs, instruments, or lamps. They operate thanks to a strong magnetic field, that focuses in the contact area, ensuring holding force from 1.3 kg to 60 kg, depending on mount size. They are especially useful 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, which protects surfaces from scratches and increases resistance to dampness. Benefits include great strength, ease of installation due to the internal threading, as well as the option to move massive steel components. However, the grip strength relies on surface thickness, type of steel, or distance between the holder and the component. It’s important to avoid impacts, as NdFeB magnets are brittle, and overtightening the screw may be dangerous. In addition, a magnetic zone may interfere with electronics, such as smartphones or magnetic cards, so holders should be kept away from such equipment. 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.

In addition to their magnetic efficiency, neodymium magnets provide the following advantages:

They virtually do not lose strength, because even after ten years, the decline in efficiency is only ~1% (in laboratory conditions),
They remain magnetized despite exposure to magnetic noise,
The use of a decorative nickel surface provides a refined finish,
They possess strong magnetic force measurable at the magnet’s surface,
With the right combination of magnetic alloys, they reach excellent thermal stability, enabling operation at or above 230°C (depending on the structure),
The ability for custom shaping or adjustment to specific needs – neodymium magnets can be manufactured in a wide range of shapes and sizes, which enhances their versatility in applications,
Wide application in cutting-edge sectors – they are utilized in HDDs, rotating machines, diagnostic apparatus and sophisticated instruments,
Relatively small size with high magnetic force – neodymium magnets offer strong power in small dimensions, which makes them ideal in compact constructions

Disadvantages of rare earth magnets:

They are fragile when subjected to a sudden impact. If the magnets are exposed to physical collisions, we recommend in a protective case. The steel housing, in the form of a holder, protects the magnet from breakage while also strengthens its overall resistance,
Magnets lose pulling force when exposed to temperatures exceeding 80°C. In most cases, this leads to irreversible performance loss (influenced by the magnet’s structure). To address this, we provide [AH] models with superior thermal resistance, able to operate even at 230°C or more,
They rust in a humid environment. If exposed to rain, we recommend using moisture-resistant magnets, such as those made of rubber,
Limited ability to create internal holes in the magnet – the use of a external casing is recommended,
Safety concern from tiny pieces may arise, if ingested accidentally, which is significant in the health of young users. Moreover, minuscule fragments from these devices may interfere with diagnostics after being swallowed,
Higher purchase price is an important factor to consider compared to ceramic magnets, especially in budget-sensitive applications

Be Cautious with Neodymium Magnets

Neodymium magnets are extremely fragile, leading to their cracking.

In the event of a collision between two neodymium magnets, it can result in them getting chipped. They are coated with a shiny nickel plating similar to steel, but they are not as hard. At the moment of collision between the magnets, small sharp metal fragments can be propelled in various directions at high speed. Eye protection is recommended.

Neodymium magnets are over 10 times more powerful than ferrite magnets (the ones in speakers), and their power can shock you.

Read the information on our website on how to properly utilize neodymium magnets and avoid significant harm to your body and unintentional disruption to the magnets.

Keep neodymium magnets as far away as possible from GPS and smartphones.

Neodymium magnets produce strong magnetic fields that interfere with magnetometers and compasses used in navigation, as well as internal compasses of smartphones and GPS devices.

The magnet coating is made of nickel, so be cautious if you have an allergy.

Studies clearly indicate a small percentage of people who suffer from metal allergies such as 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 should not be around youngest children.

Remember that neodymium magnets are not toys. Do not allow children to play with them. Small magnets can pose a serious choking hazard. If multiple magnets are swallowed, they can attract to each other through the intestinal walls, causing significant injuries, and even death.

People with pacemakers are advised to avoid neodymium magnets.

Neodymium magnets produce strong magnetic fields that can interfere with the operation of a heart pacemaker. Even if the magnetic field does not affect the device, it can damage its components or deactivate the entire device.

You should keep neodymium magnets at a safe distance from the wallet, computer, and TV.

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

Dust and powder from neodymium magnets are flammable.

Do not attempt to drill into neodymium magnets. Mechanical processing is also not recommended. Once crushed into fine powder or dust, this material becomes highly flammable.

Neodymium magnets can attract to each other, pinch the skin, and cause significant swellings.

Magnets will crack or crumble with uncontrolled joining to each other. You can't approach them to each other. At a distance less than 10 cm you should have them very strongly.

Neodymium magnets can demagnetize at high temperatures.

While Neodymium magnets can lose their magnetic properties at high temperatures, it's important to note that the extent of this effect can vary based on factors such as the magnet's material, shape, and intended application.

Warning!

Please read the article - What danger lies in neodymium magnets? You will learn how to handle them properly.