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neodymium magnets

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UMGGW 34x8 [M4] GW / N38 - magnetic holder rubber internal thread

magnetic holder rubber internal thread

Catalog no 160306

GTIN: 5906301813644

5

Diameter Ø [±0,1 mm]

34 mm

Height [±0,1 mm]

8 mm

Weight

22 g

Load capacity

7.7 kg / 75.51 N

9.84 with VAT / pcs + price for transport

8.00 ZŁ net + 23% VAT / pcs

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UMGGW 34x8 [M4] GW / N38 - magnetic holder rubber internal thread
Specification/characteristics UMGGW 34x8 [M4] GW / N38 - magnetic holder rubber internal thread
properties
values
Cat. no.
160306
GTIN
5906301813644
Production/Distribution
Dhit sp. z o.o.
Country of origin
Poland / China / Germany
Customs code
85059029
Diameter Ø
34 mm [±0,1 mm]
Height
8 mm [±0,1 mm]
Weight
22 g [±0,1 mm]
Load capacity ~ ?
7.7 kg / 75.51 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

Thanks to the use of flexible Santoprene rubber coating, these holders do not scratch paint and ensure stability even on slippery surfaces. They are standard in the advertising industry (car wrapping, foil fixing), lighting (LED work lamps), and mobile monitoring. The internal threaded bushing allows quick mounting of any element, creating a solid mounting point without drilling holes in the sheet metal.
Full rubberizing effectively isolates the magnetic system from moisture, road salt, and dirt, making them an ideal solution for outdoor applications. Santoprene rubber does not rot in the sun and retains flexibility even during frosts, guaranteeing durability. This is the recommended choice for mounting on a car roof, because you can be sure that rusty stains will not appear on the paint after rain.
Although rubber creates a small distance reducing perpendicular pull-off force, it drastically increases resistance when trying to slide the magnet across the surface. This prevents lamps or antennas from sliding down during braking or sudden maneuvers. They ensure maximum stability of mounting under vibrations, which is crucial in transport and automotive.
The holder is equipped with a steel bushing with an internal thread (you will find the thread size in the product name, e.g., M4, M6, M8). Just remember to choose the appropriate screw length – too long can push the rubber from the bottom and damage the paint.
Most rubberized holders use a special multi-pole system (often close to a Halbach array) on a steel base. Thanks to this, the magnet holds the sheet metal strongly but does not disturb devices in the cabin or attract metal objects from afar.

Advantages as well as disadvantages of NdFeB magnets.

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

  • They retain attractive force for around ten years – the loss is just ~1% (in theory),
  • Magnets very well defend themselves against loss of magnetization caused by external fields,
  • In other words, due to the metallic finish of nickel, the element becomes visually attractive,
  • The surface of neodymium magnets generates a unique magnetic field – this is a key feature,
  • Through (appropriate) combination of ingredients, they can achieve high thermal resistance, enabling operation at temperatures reaching 230°C and above...
  • Possibility of individual creating and modifying to concrete requirements,
  • Fundamental importance in modern industrial fields – they are used in computer drives, electric motors, medical equipment, and modern systems.
  • Thanks to concentrated force, small magnets offer high operating force, in miniature format,

Drawbacks and weaknesses of neodymium magnets: application proposals

  • To avoid cracks upon strong impacts, we recommend using special steel holders. Such a solution protects the magnet and simultaneously improves its durability.
  • Neodymium magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of strength (a factor is the shape as well as dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are very resistant to heat
  • Due to the susceptibility of magnets to corrosion in a humid environment, we suggest using waterproof magnets made of rubber, plastic or other material resistant to moisture, when using outdoors
  • We suggest casing - magnetic holder, due to difficulties in creating nuts inside the magnet and complex forms.
  • Potential hazard to health – tiny shards of magnets pose a threat, if swallowed, which gains importance in the context of child health protection. Furthermore, small components of these magnets can complicate diagnosis medical in case of swallowing.
  • Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Highest magnetic holding forcewhat contributes to it?

The lifting capacity listed is a measurement result conducted under specific, ideal conditions:

  • on a plate made of mild steel, perfectly concentrating the magnetic flux
  • whose thickness reaches at least 10 mm
  • with an ground contact surface
  • with total lack of distance (no coatings)
  • for force applied at a right angle (in the magnet axis)
  • at temperature room level

Determinants of practical lifting force of a magnet

In real-world applications, the actual holding force is determined by many variables, ranked from the most important:

  • Gap (between the magnet and the plate), as even a microscopic distance (e.g. 0.5 mm) can cause a drastic drop in lifting capacity by up to 50% (this also applies to paint, corrosion or dirt).
  • Angle of force application – maximum parameter is reached only during pulling at a 90° angle. The shear force of the magnet along the plate is usually several times smaller (approx. 1/5 of the lifting capacity).
  • Substrate thickness – to utilize 100% power, the steel must be adequately massive. Paper-thin metal limits the attraction force (the magnet "punches through" it).
  • Material composition – not every steel attracts identically. High carbon content worsen the attraction effect.
  • Smoothness – ideal contact is obtained only on polished steel. Any scratches and bumps create air cushions, weakening the magnet.
  • Thermal environment – temperature increase results in weakening of induction. It is worth remembering the maximum operating temperature for a given model.

* Lifting capacity was measured by applying a steel plate with a smooth surface of optimal thickness (min. 20 mm), under perpendicular pulling force, in contrast under attempts to slide the magnet the holding force is lower. Moreover, even a slight gap {between} the magnet’s surface and the plate reduces the holding force.

Safety rules for work with neodymium magnets

Danger to the youngest

Product intended for adults. Tiny parts pose a choking risk, causing serious injuries. Store away from kids and pets.

Respect the power

Handle magnets with awareness. Their immense force can surprise even professionals. Stay alert and respect their force.

Keep away from computers

Avoid bringing magnets near a wallet, computer, or screen. The magnetism can irreversibly ruin these devices and wipe information from cards.

Implant safety

Individuals with a heart stimulator should maintain an large gap from magnets. The magnetic field can interfere with the operation of the implant.

Magnetic interference

Remember: rare earth magnets generate a field that disrupts sensitive sensors. Maintain a safe distance from your phone, device, and navigation systems.

Dust explosion hazard

Powder generated during cutting of magnets is self-igniting. Avoid drilling into magnets without proper cooling and knowledge.

Heat warning

Watch the temperature. Heating the magnet above 80 degrees Celsius will ruin its properties and pulling force.

Physical harm

Large magnets can break fingers in a fraction of a second. Never place your hand between two attracting surfaces.

Allergic reactions

Some people have a hypersensitivity to Ni, which is the typical protective layer for neodymium magnets. Extended handling might lead to skin redness. We suggest use safety gloves.

Protective goggles

Watch out for shards. Magnets can explode upon violent connection, ejecting sharp fragments into the air. Wear goggles.

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