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UMGGW 66x8.5 [M8] GW / N38 - magnetic holder rubber internal thread

magnetic holder rubber internal thread

Catalog no 160308

GTIN/EAN: 5906301813668

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
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23.37 zł with VAT / pcs + price for transport

19.00 zł net + 23% VAT / pcs

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Force as well as form of neodymium magnets can be checked on our power calculator.

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Physical properties - UMGGW 66x8.5 [M8] GW / N38 - magnetic holder rubber internal thread

Specification / characteristics - UMGGW 66x8.5 [M8] GW / N38 - magnetic holder rubber internal thread

properties
properties values
Cat. no. 160308
GTIN/EAN 5906301813668
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 UMGGW 66x8.5 [M8] 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 specification and ecology

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%

Environmental data

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: 160308-2026
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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 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. 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.
Rubber has a very high coefficient of friction, which makes the holder extremely difficult to move sideways (high shear force acts). 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). 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 18.40 kg despite the distance created by the rubber layer.

Pros and cons of Nd2Fe14B magnets.

Benefits

Apart from their notable power, neodymium magnets have these key benefits:
  • They have constant strength, and over around ten years their performance decreases symbolically – ~1% (according to theory),
  • They show high resistance to demagnetization induced by external disturbances,
  • In other words, due to the metallic layer of silver, the element looks attractive,
  • Magnets have exceptionally strong magnetic induction on the active area,
  • Due to their durability and thermal resistance, neodymium magnets can operate (depending on the form) even at high temperatures reaching 230°C or more...
  • Considering the potential of flexible forming and customization to custom requirements, neodymium magnets can be created in a broad palette of forms and dimensions, which makes them more universal,
  • Versatile presence in advanced technology sectors – they are utilized in HDD drives, motor assemblies, medical equipment, as well as technologically advanced constructions.
  • Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Limitations

Cons 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.
  • 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
  • They oxidize in a humid environment. For use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
  • Due to limitations in realizing nuts and complex forms in magnets, we propose using cover - magnetic holder.
  • Possible danger related to microscopic parts of magnets can be dangerous, if swallowed, which gains importance in the aspect of protecting the youngest. Furthermore, small components of these magnets are able to disrupt the diagnostic process medical after entering the body.
  • High unit price – neodymium magnets are more expensive than other types of magnets (e.g. ferrite), which increases costs of application in large quantities

Holding force characteristics

Maximum lifting force for a neodymium magnet – what it depends on?

Magnet power is the result of a measurement for ideal contact conditions, including:
  • on a block made of mild steel, effectively closing the magnetic field
  • possessing a thickness of at least 10 mm to avoid saturation
  • characterized by even structure
  • with total lack of distance (without coatings)
  • for force applied at a right angle (pull-off, not shear)
  • at conditions approx. 20°C

Magnet lifting force in use – key factors

Please note that the application force may be lower influenced by the following factors, starting with the most relevant:
  • Distance (betwixt the magnet and the metal), as even a tiny clearance (e.g. 0.5 mm) can cause a reduction in force by up to 50% (this also applies to varnish, corrosion or debris).
  • Load vector – maximum parameter is obtained only during perpendicular pulling. The shear force of the magnet along the surface is standardly many times lower (approx. 1/5 of the lifting capacity).
  • Substrate thickness – to utilize 100% power, the steel must be sufficiently thick. Thin sheet restricts the attraction force (the magnet "punches through" it).
  • Steel type – low-carbon steel attracts best. Alloy steels reduce magnetic properties and lifting capacity.
  • Smoothness – full contact is possible only on polished steel. Any scratches and bumps reduce the real contact area, reducing force.
  • Heat – neodymium magnets have a negative temperature coefficient. At higher temperatures they are weaker, and at low temperatures gain strength (up to a certain limit).

Holding force was checked on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, whereas under shearing force the load capacity is reduced by as much as 5 times. In addition, even a slight gap between the magnet’s surface and the plate decreases the load capacity.

H&S for magnets
Demagnetization risk

Do not overheat. Neodymium magnets are susceptible to heat. If you need resistance above 80°C, inquire about special high-temperature series (H, SH, UH).

Danger to pacemakers

Patients with a ICD have to maintain an absolute distance from magnets. The magnetism can disrupt the operation of the life-saving device.

Handling guide

Before use, check safety instructions. Uncontrolled attraction can destroy the magnet or injure your hand. Be predictive.

Mechanical processing

Fire warning: Rare earth powder is highly flammable. Avoid machining magnets without safety gear as this may cause fire.

Allergy Warning

Medical facts indicate that nickel (standard magnet coating) is a strong allergen. If your skin reacts to metals, prevent touching magnets with bare hands or choose coated magnets.

Crushing risk

Watch your fingers. Two large magnets will snap together instantly with a force of several hundred kilograms, destroying everything in their path. Exercise extreme caution!

Keep away from children

Neodymium magnets are not suitable for play. Accidental ingestion of a few magnets can lead to them connecting inside the digestive tract, which constitutes a severe health hazard and requires urgent medical intervention.

Protective goggles

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

Magnetic media

Device Safety: Neodymium magnets can ruin payment cards and delicate electronics (pacemakers, hearing aids, mechanical watches).

Threat to navigation

Note: neodymium magnets produce a field that interferes with precision electronics. Maintain a safe distance from your mobile, device, and navigation systems.

Warning! Learn more about risks in the article: Safety of working with magnets.