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

magnetic holder rubber internal thread

Catalog no 160306

GTIN/EAN: 5906301813644

5.00

Diameter Ø

34 mm [±1 mm]

Height

8 mm [±1 mm]

Weight

22 g

Load capacity

7.70 kg / 75.51 N

technical details »

9.84 ZŁ with VAT / pcs + price for transport

8.00 ZŁ net + 23% VAT / pcs

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

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

properties
properties values
Cat. no. 160306
GTIN/EAN 5906301813644
Production/Distribution Dhit sp. z o.o.
ul. Zielona 14 05-850 Ożarów Mazowiecki PL
Country of origin Poland / China / Germany
Customs code 85059029
Diameter Ø 34 mm [±1 mm]
Height 8 mm [±1 mm]
Weight 22 g
Load capacity ~ ? 7.70 kg / 75.51 N
Manufacturing Tolerance ±1 mm

Magnetic properties of material N38

Specification / characteristics UMGGW 34x8 [M4] GW / N38 - magnetic holder rubber internal thread
properties values units
remenance Br [min. - max.] ? 12.2-12.6 kGs
remenance Br [min. - max.] ? 1220-1260 mT
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

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 10-6 °C-1
Thermal expansion perpendicular (⊥) to orientation (M) -(1-3) x 10-6 °C-1
Young's modulus 1.7 x 104 kg/mm²
Technical and environmental data
Chemical composition
iron (Fe) 64% – 68%
neodymium (Nd) 29% – 32%
boron (B) 1.1% – 1.2%
dysprosium (Dy) 0.5% – 2.0%
coating (Ni-Cu-Ni) < 0.05%
Sustainability
recyclability (EoL) 100%
recycled raw materials ~10% (pre-cons)
carbon footprint low / zredukowany
waste code (EWC) 16 02 16
Safety card (GPSR)
responsible entity
Dhit sp. z o.o.
ul. Kościuszki 6A, 05-850 Ożarów Mazowiecki
tel: +48 22 499 98 98 | e-mail: bok@dhit.pl
batch number/type
id: 160306-2026
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Magnets in rubber were created for safe mounting on sensitive painted surfaces, such as car bodies or machine casings. Used for mounting taxi beacons, antennas, cameras, and license plates at rallies, where mobility counts. The internal threaded bushing allows easy screwing of any element, creating a solid mounting point without drilling holes in the sheet metal.
Yes, thanks to the hermetic 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 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.
Inside there are several magnets arranged with alternating poles on a steel plate, which closes the magnetic field close to the surface. This is much safer for electronics inside the vehicle (e.g., under the roof) compared to regular magnets.

Strengths as well as weaknesses of neodymium magnets.

Advantages

In addition to their magnetic efficiency, neodymium magnets provide the following advantages:
  • They have unchanged lifting capacity, and over nearly 10 years their performance decreases symbolically – ~1% (in testing),
  • They do not lose their magnetic properties even under close interference source,
  • The use of an shiny coating of noble metals (nickel, gold, silver) causes the element to present itself better,
  • They are known for high magnetic induction at the operating surface, which improves attraction properties,
  • Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their form) at temperatures up to 230°C and above...
  • Possibility of detailed modeling as well as adjusting to precise needs,
  • Versatile presence in future technologies – they are utilized in computer drives, electric drive systems, precision medical tools, and multitasking production systems.
  • Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Cons

Disadvantages of NdFeB magnets:
  • They are fragile upon too strong impacts. To avoid cracks, it is worth protecting magnets in a protective case. Such protection not only protects the magnet but also improves its resistance to damage
  • NdFeB magnets lose strength when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of power (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 advise using waterproof magnets made of rubber, plastic or other material immune to moisture, when using outdoors
  • We suggest cover - magnetic mechanism, due to difficulties in producing nuts inside the magnet and complicated forms.
  • Health risk resulting from small fragments of magnets are risky, in case of ingestion, which gains importance in the context of child health protection. It is also worth noting that small elements of these products are able to complicate diagnosis medical when they are in the body.
  • Due to neodymium price, their price is higher than average,

Lifting parameters

Optimal lifting capacity of a neodymium magnet – what contributes to it?

Breakaway force is the result of a measurement for the most favorable conditions, assuming:
  • using a sheet made of low-carbon steel, serving as a circuit closing element
  • with a cross-section no less than 10 mm
  • with an polished contact surface
  • with zero gap (no impurities)
  • for force acting at a right angle (in the magnet axis)
  • at ambient temperature room level

Practical lifting capacity: influencing factors

Effective lifting capacity is influenced by working environment parameters, such as (from priority):
  • Distance – the presence of foreign body (rust, tape, air) acts as an insulator, which reduces power rapidly (even by 50% at 0.5 mm).
  • Force direction – declared lifting capacity refers to detachment vertically. When slipping, the magnet exhibits much less (often approx. 20-30% of maximum force).
  • Steel thickness – insufficiently thick sheet 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. High carbon content weaken the attraction effect.
  • Smoothness – ideal contact is obtained only on smooth steel. Any scratches and bumps reduce the real contact area, weakening the magnet.
  • Thermal factor – hot environment weakens pulling force. Exceeding the limit temperature can permanently demagnetize the magnet.

Holding force was checked on the plate surface of 20 mm thickness, when a perpendicular force was applied, whereas under shearing force the lifting capacity is smaller. Moreover, even a small distance between the magnet’s surface and the plate lowers the load capacity.

Safe handling of neodymium magnets
Allergic reactions

Some people have a sensitization to nickel, which is the standard coating for neodymium magnets. Prolonged contact can result in an allergic reaction. We recommend use protective gloves.

Magnets are brittle

NdFeB magnets are ceramic materials, which means they are fragile like glass. Collision of two magnets leads to them cracking into shards.

Adults only

NdFeB magnets are not toys. Accidental ingestion of a few magnets can lead to them pinching intestinal walls, which poses a severe health hazard and necessitates immediate surgery.

Heat warning

Regular neodymium magnets (grade N) undergo demagnetization when the temperature goes above 80°C. Damage is permanent.

Crushing force

Pinching hazard: The pulling power is so great that it can cause hematomas, pinching, and broken bones. Protective gloves are recommended.

Medical interference

Medical warning: Neodymium magnets can turn off pacemakers and defibrillators. Do not approach if you have electronic implants.

GPS Danger

GPS units and smartphones are highly sensitive to magnetic fields. Direct contact with a strong magnet can permanently damage the internal compass in your phone.

Powerful field

Before use, read the rules. Sudden snapping can destroy the magnet or hurt your hand. Be predictive.

Magnetic media

Equipment safety: Neodymium magnets can damage payment cards and delicate electronics (heart implants, medical aids, timepieces).

Fire warning

Mechanical processing of neodymium magnets poses a fire risk. Neodymium dust reacts violently with oxygen and is hard to extinguish.

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