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UMGGW 88x8.5 [M6] GW / N38 - magnetic holder rubber internal thread

Name: Dhit sp. z o.o.
Address: Kościuszki 6A, Ożarów Mazowiecki, Poland, 05-850, PL
Telephone: +48 22 499 98 98
Price range: 1-6500
Rating: 5

magnetic holder rubber internal thread

Catalog no 160309

GTIN: 5906301813675

5.00

Diameter Ø

88 mm [±1 mm]

Height

8.5 mm [±1 mm]

Weight

186 g

Load capacity

42.90 kg / 420.71 N

40.59 ZŁ with VAT / pcs + price for transport

33.00 ZŁ net + 23% VAT / pcs

bulk discounts:

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35.72 ZŁ

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Need advice?

Contact us by phone +48 22 499 98 98 otherwise contact us by means of form the contact form page.
Specifications as well as form of neodymium magnets can be analyzed on our magnetic mass calculator.

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UMGGW 88x8.5 [M6] GW / N38 - magnetic holder rubber internal thread

Specification / characteristics UMGGW 88x8.5 [M6] GW / N38 - magnetic holder rubber internal thread

properties

properties	values
Cat. no.	160309
GTIN	5906301813675
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	88 mm [±1 mm]
Height	8.5 mm [±1 mm]
Weight	186 g
Load capacity ~ ?	42.90 kg / 420.71 N
Manufacturing Tolerance	±1 mm

Magnetic properties of material N38

Specification / characteristics UMGGW 88x8.5 [M6] 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	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

Measurement Calculator

Force (Pull)

Kilograms (kg)

Force (N)

Pounds (lbs)

Magnetic Field

Induction (Gs)

Tesla (T)

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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 quick disassembly counts. 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 long life. 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.

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.

Most rubberized holders use a special multi-pole system (often close to a Halbach array) on a steel base. This is much safer for electronics inside the vehicle (e.g., under the roof) compared to regular magnets.

Pros as well as cons of rare earth magnets.

Advantages

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

They virtually do not lose strength, because even after ten years the decline in efficiency is only ~1% (in laboratory conditions),
Neodymium magnets are distinguished by extremely resistant to loss of magnetic properties caused by external magnetic fields,
Thanks to the smooth finish, the plating of Ni-Cu-Ni, gold-plated, or silver gives an visually attractive appearance,
Magnetic induction on the working part of the magnet is extremely intense,
Thanks to resistance to high temperature, they are capable of working (depending on the shape) even at temperatures up to 230°C and higher...
Possibility of detailed forming as well as optimizing to precise conditions,
Key role in modern industrial fields – they are utilized in data components, motor assemblies, advanced medical instruments, as well as other advanced devices.
Compactness – despite small sizes they generate large force, making them ideal for precision applications

Disadvantages

Disadvantages of NdFeB magnets:

To avoid cracks upon strong impacts, we recommend using special steel holders. Such a solution protects the magnet and simultaneously increases its durability.
When exposed to high temperature, neodymium magnets suffer a drop in strength. Often, when the temperature exceeds 80°C, their power 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. To use them in conditions outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which secure oxidation as well as corrosion.
We recommend cover - magnetic mount, due to difficulties in producing threads inside the magnet and complicated forms.
Potential hazard related to microscopic parts of magnets can be dangerous, if swallowed, which is particularly important in the context of child safety. Furthermore, tiny parts of these magnets are able to be problematic in diagnostics medical after entering the body.
Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Pull force analysis

Maximum holding power of the magnet – what affects it?

Breakaway force is the result of a measurement for optimal configuration, assuming:

with the contact of a yoke made of low-carbon steel, guaranteeing maximum field concentration
whose transverse dimension is min. 10 mm
with a surface free of scratches
with direct contact (no impurities)
for force acting at a right angle (in the magnet axis)
at temperature approx. 20 degrees Celsius

Determinants of practical lifting force of a magnet

In real-world applications, the real power depends on a number of factors, presented from the most important:

Space between magnet and steel – even a fraction of a millimeter of distance (caused e.g. by veneer or dirt) diminishes the magnet efficiency, often by half at just 0.5 mm.
Angle of force application – highest force is available only during pulling at a 90° angle. The shear force of the magnet along the surface is standardly several times smaller (approx. 1/5 of the lifting capacity).
Metal thickness – thin material does not allow full use of the magnet. Magnetic flux penetrates through instead of generating force.
Steel grade – the best choice is high-permeability steel. Hardened steels may generate lower lifting capacity.
Base smoothness – the smoother and more polished the surface, the larger the contact zone and higher the lifting capacity. Roughness acts like micro-gaps.
Operating temperature – neodymium magnets have a sensitivity to temperature. When it is hot they are weaker, and in frost they can be stronger (up to a certain limit).

Lifting capacity testing was performed on plates with a smooth surface of optimal thickness, under a perpendicular pulling force, whereas under shearing force the holding force is lower. Additionally, even a minimal clearance between the magnet’s surface and the plate lowers the load capacity.

Safe handling of neodymium magnets

Magnet fragility

Beware of splinters. Magnets can fracture upon violent connection, ejecting sharp fragments into the air. We recommend safety glasses.

Precision electronics

A powerful magnetic field interferes with the operation of magnetometers in phones and GPS navigation. Maintain magnets near a device to avoid damaging the sensors.

Do not drill into magnets

Fire warning: Neodymium dust is highly flammable. Avoid machining magnets in home conditions as this risks ignition.

Allergy Warning

Studies show that nickel (the usual finish) is a potent allergen. If you have an allergy, avoid direct skin contact or opt for encased magnets.

Heat sensitivity

Monitor thermal conditions. Heating the magnet above 80 degrees Celsius will ruin its properties and pulling force.

No play value

Absolutely keep magnets out of reach of children. Risk of swallowing is significant, and the consequences of magnets connecting inside the body are fatal.

Electronic devices

Device Safety: Neodymium magnets can damage payment cards and sensitive devices (pacemakers, hearing aids, mechanical watches).

Finger safety

Large magnets can crush fingers in a fraction of a second. Under no circumstances put your hand between two attracting surfaces.

Immense force

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

Implant safety

Medical warning: Strong magnets can deactivate pacemakers and defibrillators. Stay away if you have medical devices.

Important! Looking for details? Read our article: Are neodymium magnets dangerous?

UMGGW 88x8.5 [M6] GW / N38 - magnetic holder rubber internal thread

Need advice?

UMGGW 88x8.5 [M6] GW / N38 - magnetic holder rubber internal thread

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Force (Pull)

Magnetic Field

Other proposals

BM 750x180x70 [4x M8] - magnetic beam

JM 15x40 - jajka w pudełku/cena za parę - magnetic eggs

SMZR 25x250 / N52 - magnetic separator with handle

MW 38x3.5 / N38 - cylindrical magnet

Pros as well as cons of rare earth magnets.

Advantages

Disadvantages

Pull force analysis

Maximum holding power of the magnet – what affects it?

Determinants of practical lifting force of a magnet

Magnet fragility

Precision electronics

Do not drill into magnets

Allergy Warning

Heat sensitivity

No play value

Electronic devices

Finger safety

Immense force

Implant safety

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C