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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

Diameter Ø

66 mm [±1 mm]

Height

8.5 mm [±1 mm]

Weight

100 g

Load capacity

18.40 kg / 180.44 N

product specifications »

23.37 ZŁ with VAT / pcs + price for transport

19.00 ZŁ net + 23% VAT / pcs

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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
Elemental analysis
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: 160308-2026
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Magnets in rubber were created for non-invasive mounting on sensitive painted surfaces, such as car bodies or machine casings. They are commonly used 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.
Full rubberizing effectively isolates the magnetic system from moisture, road salt, and dirt, making them an ideal solution for outdoor applications. 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.
Although rubber creates a small distance reducing perpendicular pull-off force, it drastically increases resistance when trying to slide the magnet across the surface. Thanks to this, these magnets hold onto the car roof excellently even at high speeds and wind resistance. They ensure maximum stability of mounting under vibrations, which is crucial in transport and automotive.
You can screw any metric bolt, hook, handle, cable holder into the magnet or screw the device housing directly. 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. Thanks to this, the magnet holds the sheet metal strongly but does not disturb devices in the cabin or attract metal objects from afar.

Pros as well as cons of neodymium magnets.

Strengths

In addition to their magnetic efficiency, neodymium magnets provide the following advantages:
  • They do not lose magnetism, even during approximately 10 years – the drop in lifting capacity is only ~1% (according to tests),
  • They do not lose their magnetic properties even under close interference source,
  • In other words, due to the reflective surface of gold, the element becomes visually attractive,
  • The surface of neodymium magnets generates a concentrated magnetic field – this is one of their assets,
  • 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...
  • Considering the potential of precise shaping and customization to unique needs, NdFeB magnets can be modeled in a wide range of forms and dimensions, which increases their versatility,
  • Universal use in innovative solutions – they find application in computer drives, drive modules, medical devices, also multitasking production systems.
  • Relatively small size with high pulling force – neodymium magnets offer high power in tiny dimensions, which makes them useful in miniature devices

Limitations

Disadvantages of neodymium magnets:
  • At very strong impacts they can break, therefore we advise placing them in strong housings. A metal housing provides additional protection against damage and increases the magnet's durability.
  • Neodymium magnets decrease their power under the influence of heating. As soon as 80°C is exceeded, many of them start losing their force. Therefore, we recommend our special magnets marked [AH], which maintain stability even at temperatures up to 230°C
  • They oxidize in a humid environment - during use outdoors we advise using waterproof magnets e.g. in rubber, plastic
  • We recommend a housing - magnetic holder, due to difficulties in producing threads inside the magnet and complicated shapes.
  • Possible danger related to microscopic parts of magnets can be dangerous, in case of ingestion, which is particularly important in the aspect of protecting the youngest. It is also worth noting that small elements of these devices can complicate diagnosis medical when they are in 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

Maximum holding power of the magnet – what it depends on?

Breakaway force was determined for ideal contact conditions, taking into account:
  • using a base made of high-permeability steel, acting as a ideal flux conductor
  • possessing a massiveness of min. 10 mm to avoid saturation
  • with an ground contact surface
  • under conditions of gap-free contact (surface-to-surface)
  • under perpendicular force direction (90-degree angle)
  • in neutral thermal conditions

What influences lifting capacity in practice

In real-world applications, the real power depends on several key aspects, listed from most significant:
  • Clearance – the presence of foreign body (rust, tape, air) acts as an insulator, which lowers power rapidly (even by 50% at 0.5 mm).
  • Loading method – catalog parameter refers to pulling vertically. When applying parallel force, the magnet exhibits much less (often approx. 20-30% of nominal force).
  • Base massiveness – insufficiently thick sheet does not close the flux, causing part of the flux to be escaped to the other side.
  • Steel grade – the best choice is pure iron steel. Cast iron may have worse magnetic properties.
  • Smoothness – full contact is obtained only on smooth steel. Rough texture reduce the real contact area, reducing force.
  • Temperature – temperature increase results in weakening of force. Check the thermal limit for a given model.

Lifting capacity was determined by applying a polished steel plate of suitable thickness (min. 20 mm), under perpendicular detachment force, in contrast under parallel forces the holding force is lower. Moreover, even a minimal clearance between the magnet and the plate reduces the lifting capacity.

Precautions when working with NdFeB magnets
Implant safety

Health Alert: Strong magnets can turn off heart devices and defibrillators. Stay away if you have electronic implants.

Machining danger

Powder produced during grinding of magnets is combustible. Do not drill into magnets unless you are an expert.

Crushing force

Big blocks can break fingers instantly. Under no circumstances place your hand between two strong magnets.

Keep away from electronics

Remember: rare earth magnets generate a field that confuses sensitive sensors. Keep a safe distance from your phone, device, and GPS.

Maximum temperature

Monitor thermal conditions. Exposing the magnet to high heat will ruin its magnetic structure and strength.

Adults only

Neodymium magnets are not toys. Accidental ingestion of a few magnets can lead to them connecting inside the digestive tract, which constitutes a severe health hazard and necessitates immediate surgery.

Nickel coating and allergies

It is widely known that nickel (standard magnet coating) is a potent allergen. For allergy sufferers, refrain from direct skin contact or select coated magnets.

Cards and drives

Very strong magnetic fields can destroy records on credit cards, hard drives, and storage devices. Maintain a gap of at least 10 cm.

Immense force

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

Magnets are brittle

NdFeB magnets are sintered ceramics, meaning they are prone to chipping. Collision of two magnets will cause them breaking into shards.

Important! Need more info? Check our post: Are neodymium magnets dangerous?