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UMGGZ 66x8.5 [M8] GZ / N38 - rubber magnetic holder external thread

rubber magnetic holder external thread

Catalog no 340423

GTIN/EAN: 5906301814764

5.00
Load capacity 18.40 kg / 180.44 N
Diameter Ø
66 mm [±1 mm]
Height
8.5 mm [±1 mm]
Weight
100 g
product specifications »

23.37 zł with VAT / pcs + price for transport

19.00 zł net + 23% VAT / pcs

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Weight and structure of neodymium magnets can be calculated on our power calculator.

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Physical properties - UMGGZ 66x8.5 [M8] GZ / N38 - rubber magnetic holder external thread

Specification / characteristics - UMGGZ 66x8.5 [M8] GZ / N38 - rubber magnetic holder external thread

properties
properties values
Cat. no. 340423
GTIN/EAN 5906301814764
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 66 mm [±1 mm]
Height 8.5 mm [±1 mm]
Weight 100 g
Load capacity ~ ? 18.40 kg / 180.44 N
Manufacturing Tolerance ±1 mm

Magnetic properties of material N38

Specification / characteristics UMGGZ 66x8.5 [M8] GZ / N38 - rubber magnetic holder external 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
Engineering data and GPSR

Material specification

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%

Ecology and recycling (GPSR)

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: 340423-2026
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The protruding thread allows instant screwing of a lamp or holder using a nut. Ideally suited for outdoor, off-road applications and on special vehicles.
The magnet is tightly sealed with rubber, which protects it from water, road salt, mud, and corrosion. The rubber is resistant to UV radiation and does not crack in the sun.
Thanks to the rubber properties, the holder does not slide on the roof, preventing micro-scratches. A clean surface under the magnet guarantees no scratches and maximum adhesion.
The thread size is standard and fits typical nuts available in hardware stores. It is a solid threaded connection made of galvanized steel, resistant to breaking.
Although nominal capacity (e.g., 18.40 kg) is lower than a bare magnet, real adhesion on slippery paint is much better. Model UMGGZ 66x8.5 [M8] GZ / N38 is adapted to hold elements at road speeds if you choose the right number of mounting points.

Strengths and weaknesses of neodymium magnets.

Benefits

Besides their stability, neodymium magnets are valued for these benefits:
  • They retain attractive force for around 10 years – the loss is just ~1% (according to analyses),
  • They show high resistance to demagnetization induced by external field influence,
  • By using a lustrous coating of gold, the element gains an proper look,
  • Neodymium magnets ensure maximum magnetic induction on a small area, which increases force concentration,
  • 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...
  • Thanks to modularity in constructing and the capacity to customize to individual projects,
  • Significant place in innovative solutions – they are used in data components, drive modules, medical devices, also other advanced devices.
  • Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in tiny dimensions, which enables their usage in compact constructions

Weaknesses

Disadvantages of NdFeB magnets:
  • They are prone to damage upon heavy impacts. To avoid cracks, it is worth securing magnets in special housings. Such protection not only protects the magnet but also increases its resistance to damage
  • When exposed to high temperature, neodymium magnets suffer a drop in force. Often, when the temperature exceeds 80°C, their strength decreases (depending on the size and 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 start to rust. For applications outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which secure oxidation and corrosion.
  • Limited possibility of making nuts in the magnet and complicated forms - recommended is cover - mounting mechanism.
  • Possible danger to health – tiny shards of magnets are risky, if swallowed, which becomes key in the aspect of protecting the youngest. It is also worth noting that small components of these devices are able to complicate diagnosis medical after entering the body.
  • High unit price – neodymium magnets are more expensive than other types of magnets (e.g. ferrite), which can limit application in large quantities

Pull force analysis

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

The force parameter is a theoretical maximum value conducted under the following configuration:
  • on a base made of structural steel, effectively closing the magnetic flux
  • with a thickness of at least 10 mm
  • with an polished touching surface
  • without the slightest air gap between the magnet and steel
  • for force acting at a right angle (in the magnet axis)
  • at room temperature

Magnet lifting force in use – key factors

Effective lifting capacity impacted by working environment parameters, such as (from priority):
  • Gap between magnet and steel – even a fraction of a millimeter of separation (caused e.g. by varnish or dirt) significantly weakens the pulling force, often by half at just 0.5 mm.
  • Pull-off angle – note that the magnet has greatest strength perpendicularly. Under shear forces, the holding force drops drastically, often to levels of 20-30% of the nominal value.
  • Steel thickness – insufficiently thick plate causes magnetic saturation, causing part of the power to be escaped to the other side.
  • Metal type – different alloys attracts identically. High carbon content weaken the attraction effect.
  • Surface condition – ground elements guarantee perfect abutment, which improves field saturation. Rough surfaces weaken the grip.
  • Temperature – temperature increase causes a temporary drop of force. It is worth remembering the maximum operating temperature for a given model.

Lifting capacity testing was conducted on plates with a smooth surface of optimal thickness, under a perpendicular pulling force, whereas under attempts to slide the magnet the load capacity is reduced by as much as fivefold. In addition, even a small distance between the magnet and the plate reduces the holding force.

Precautions when working with NdFeB magnets
Avoid contact if allergic

Certain individuals experience a contact allergy to nickel, which is the typical protective layer for NdFeB magnets. Extended handling can result in a rash. We recommend use protective gloves.

Magnetic media

Avoid bringing magnets close to a wallet, computer, or TV. The magnetism can irreversibly ruin these devices and erase data from cards.

Bodily injuries

Watch your fingers. Two large magnets will join immediately with a force of massive weight, destroying anything in their path. Exercise extreme caution!

Health Danger

For implant holders: Powerful magnets disrupt electronics. Maintain at least 30 cm distance or ask another person to work with the magnets.

Product not for children

Neodymium magnets are not suitable for play. Accidental ingestion of several magnets may result in them connecting inside the digestive tract, which constitutes a severe health hazard and necessitates immediate surgery.

Safe operation

Use magnets consciously. Their huge power can shock even professionals. Stay alert and respect their power.

Shattering risk

Despite the nickel coating, the material is delicate and cannot withstand shocks. Avoid impacts, as the magnet may shatter into sharp, dangerous pieces.

Demagnetization risk

Keep cool. Neodymium magnets are susceptible to temperature. If you need operation above 80°C, inquire about special high-temperature series (H, SH, UH).

GPS Danger

A strong magnetic field negatively affects the functioning of magnetometers in smartphones and GPS navigation. Maintain magnets near a device to avoid damaging the sensors.

Combustion hazard

Powder generated during grinding of magnets is flammable. Do not drill into magnets without proper cooling and knowledge.

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