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neodymium magnets

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UMGGW 22x6 [M4] GW / N38 - magnetic holder rubber internal thread

magnetic holder rubber internal thread

Catalog no 160304

GTIN: 5906301813620

5

Diameter Ø

22 mm [±1 mm]

Height

6 mm [±1 mm]

Weight

12 g

Load capacity

5.1 kg / 50.01 N

7.38 with VAT / pcs + price for transport

6.00 ZŁ net + 23% VAT / pcs

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UMGGW 22x6 [M4] GW / N38 - magnetic holder rubber internal thread
Specification/characteristics UMGGW 22x6 [M4] GW / N38 - magnetic holder rubber internal thread
properties
values
Cat. no.
160304
GTIN
5906301813620
Production/Distribution
Dhit sp. z o.o.
Country of origin
Poland / China / Germany
Customs code
85059029
Diameter Ø
22 mm [±1 mm]
Height
6 mm [±1 mm]
Weight
12 g
Load capacity ~ ?
5.1 kg / 50.01 N
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

Thanks to the use of soft Santoprene rubber coating, these holders do not scratch paint and ensure excellent grip even on slippery surfaces. Used for mounting taxi beacons, antennas, cameras, and license plates at rallies, where quick disassembly counts. The internal threaded bushing allows quick mounting of any element, creating a solid mounting point without drilling holes in the sheet metal.
Yes, thanks to the tight rubber coating, these magnets are fully waterproof and protected against corrosion. They can be safely used outdoors all year round, maintaining their properties in a wide temperature range. This is the best choice for mounting on a car roof, because you can be sure that rusty stains will not appear on the paint after rain.
Rubber has a very high coefficient of friction, which makes the holder extremely difficult to move sideways (high shear force acts). Thanks to this, these magnets hold onto the car roof excellently even at high speeds and wind resistance. They ensure safety of mounting under vibrations, which is crucial in transport and automotive.
The standard metric thread allows easy integration with most accessories available on the market. This enables quick creation of a magnetic base for work lighting, reversing cameras, sensors, or advertising boards.
Most rubberized holders use a special multi-pole system (often close to a Halbach array) on a steel base. Field concentration allows achieving high holding force 5.1 kg despite the distance created by the rubber layer.

Pros and cons of NdFeB magnets.

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

  • They have unchanged lifting capacity, and over more than 10 years their attraction force decreases symbolically – ~1% (according to theory),
  • They do not lose their magnetic properties even under close interference source,
  • Thanks to the glossy finish, the plating of nickel, gold, or silver gives an visually attractive appearance,
  • The surface of neodymium magnets generates a maximum magnetic field – this is one of their assets,
  • Through (adequate) combination of ingredients, they can achieve high thermal resistance, enabling functioning at temperatures approaching 230°C and above...
  • Possibility of accurate modeling and adjusting to individual requirements,
  • Significant place in modern industrial fields – they find application in HDD drives, motor assemblies, diagnostic systems, also industrial machines.
  • Thanks to efficiency per cm³, small magnets offer high operating force, occupying minimum space,

Characteristics of disadvantages of neodymium magnets: application proposals

  • They are fragile upon heavy impacts. To avoid cracks, it is worth securing magnets in special housings. Such protection not only protects the magnet but also improves its resistance to damage
  • When exposed to high temperature, neodymium magnets suffer a drop in power. Often, when the temperature exceeds 80°C, their strength decreases (depending on the size, as well as 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 usually rust. For applications outside, it is recommended to use protective magnets, such as those in rubber or plastics, which secure oxidation as well as corrosion.
  • Due to limitations in creating threads and complicated forms in magnets, we recommend using a housing - magnetic holder.
  • Possible danger to health – tiny shards of magnets are risky, in case of ingestion, which gains importance in the context of child health protection. Furthermore, tiny parts of these magnets can complicate diagnosis medical in case of swallowing.
  • Due to complex production process, their price is relatively high,

Magnetic strength at its maximum – what affects it?

Breakaway force was defined for the most favorable conditions, including:

  • with the application of a sheet made of special test steel, guaranteeing full magnetic saturation
  • possessing a thickness of at least 10 mm to ensure full flux closure
  • characterized by even structure
  • under conditions of gap-free contact (surface-to-surface)
  • under vertical force vector (90-degree angle)
  • at temperature approx. 20 degrees Celsius

Lifting capacity in real conditions – factors

Bear in mind that the magnet holding may be lower subject to elements below, starting with the most relevant:

  • Gap between surfaces – even a fraction of a millimeter of separation (caused e.g. by veneer or dirt) drastically reduces the magnet efficiency, often by half at just 0.5 mm.
  • Loading method – declared lifting capacity refers to pulling vertically. When attempting to slide, the magnet holds significantly lower power (typically approx. 20-30% of maximum force).
  • Element thickness – to utilize 100% power, the steel must be adequately massive. Thin sheet restricts the lifting capacity (the magnet "punches through" it).
  • Metal type – different alloys reacts the same. High carbon content weaken the attraction effect.
  • Plate texture – ground elements ensure maximum contact, which improves force. Uneven metal reduce efficiency.
  • Thermal environment – heating the magnet results in weakening of induction. It is worth remembering the maximum operating temperature for a given model.

* Lifting capacity testing was carried out on a smooth plate of suitable thickness, under perpendicular forces, in contrast under attempts to slide the magnet the load capacity is reduced by as much as fivefold. Moreover, even a slight gap {between} the magnet and the plate reduces the load capacity.

Safe handling of NdFeB magnets

Implant safety

For implant holders: Powerful magnets affect electronics. Keep minimum 30 cm distance or request help to handle the magnets.

Threat to electronics

Do not bring magnets close to a purse, laptop, or screen. The magnetism can destroy these devices and erase data from cards.

Metal Allergy

Allergy Notice: The nickel-copper-nickel coating contains nickel. If skin irritation appears, immediately stop working with magnets and wear gloves.

Thermal limits

Standard neodymium magnets (N-type) undergo demagnetization when the temperature goes above 80°C. The loss of strength is permanent.

Fragile material

Protect your eyes. Magnets can explode upon violent connection, ejecting sharp fragments into the air. Eye protection is mandatory.

Mechanical processing

Powder generated during machining of magnets is self-igniting. Do not drill into magnets unless you are an expert.

Precision electronics

Be aware: neodymium magnets generate a field that confuses precision electronics. Keep a safe distance from your mobile, device, and GPS.

Product not for children

NdFeB magnets are not suitable for play. Eating multiple magnets can lead to them attracting across intestines, which constitutes a severe health hazard and requires urgent medical intervention.

Finger safety

Large magnets can smash fingers in a fraction of a second. Never put your hand betwixt two strong magnets.

Do not underestimate power

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

Warning!

Learn more about hazards in the article: Safety of working with magnets.

Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98