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

magnetic holder rubber internal thread

Catalog no 160309

GTIN/EAN: 5906301813675

5.00
Load capacity 42.90 kg / 420.71 N
Diameter Ø
88 mm [±1 mm]
Height
8.5 mm [±1 mm]
Weight
186 g

How we measure these parameters — certificates and measurements

check technical specifications »

33.00 zł net / pcs

40.59 zł with VAT (23% VAT) / pcs

price for transport

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Gross
price from 1 pcs
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40.59 zł
price from 10 pcs
31.02 zł
38.15 zł
price from 30 pcs
29.04 zł
35.72 zł

Frequently asked questions

How much will a magnetic holder hold in practice?
The catalogue value assumes full contact with smooth steel at least 10 mm thick and a perpendicular pull. Thinner sheet, paint, rust and surface irregularities reduce it considerably: on 1 mm sheet about half remains. Lifting and vertical mounting call for an additional safety margin.
Will a holder work on stainless steel?
Not on austenitic grades 304 and 316 — they are effectively non-magnetic. It will not work on aluminium, copper or brass either. Those materials need a mechanical gripper.
Which coating for which conditions?
Nickel-copper-nickel (NiCuNi) is the standard and covers most applications. Epoxy is used for damp environments and outdoor work, zinc is sufficient for dry interiors. Holders in a steel housing or in rubber also protect the magnet against impact.

Guides from the knowledge base

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Call us now +48 888 99 98 98 alternatively let us know using contact form the contact section.
Specifications and structure of a neodymium magnet can be estimated using our power calculator.

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Technical specification of the product - 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/EAN 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
Remanence Br ? 12.2-12.6 kGs
Remanence Br ? 1220-1260 mT
Coercivity bHc ? 10.8-11.5 kOe
Coercivity bHc ? 860-915 kA/m
Intrinsic coercivity iHc ≥ 12 kOe
Intrinsic coercivity iHc ≥ 955 kA/m
Energy product BHmax ? 36-38 BH max MGOe
Energy product BHmax ? 287-303 BH max KJ/m
Maximum working 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 310 °C
Curie Temperature TF 590 °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

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%

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: 160309-2026
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Thanks to the use of flexible Santoprene rubber coating, these holders do not scratch paint and ensure excellent grip 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 long life. 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 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. This enables quick creation of a mobile mounting point for work lighting, reversing cameras, sensors, or advertising boards.
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.

Advantages as well as disadvantages of neodymium magnets.

Pros

Apart from their consistent holding force, neodymium magnets have these key benefits:
  • They have constant strength, and over more than ten years their attraction force decreases symbolically – ~1% (in testing),
  • They are noted for resistance to demagnetization induced by external magnetic fields,
  • A magnet with a shiny nickel surface looks better,
  • The surface of neodymium magnets generates a maximum magnetic field – this is a distinguishing feature,
  • Thanks to resistance to high temperature, they are capable of working (depending on the form) even at temperatures up to 230°C and higher...
  • Thanks to versatility in constructing and the ability to customize to unusual requirements,
  • Versatile presence in innovative solutions – they are used in magnetic memories, electric motors, precision medical tools, also other advanced devices.
  • Relatively small size with high pulling force – neodymium magnets offer high power in tiny dimensions, which makes them useful in compact constructions

Weaknesses

Disadvantages of NdFeB magnets:
  • Susceptibility to cracking is one of their disadvantages. Upon intense impact they can fracture. We recommend keeping them in a special holder, which not only protects them against impacts but also increases their durability
  • When exposed to high temperature, neodymium magnets experience a drop in strength. Often, when the temperature exceeds 80°C, their power decreases (depending on the size, as well as 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 usually 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.
  • Limited possibility of making nuts in the magnet and complex forms - preferred is a housing - magnet mounting.
  • Possible danger resulting from small fragments of magnets are risky, when accidentally swallowed, which becomes key in the context of child safety. Additionally, small elements of these magnets can complicate diagnosis medical in case of swallowing.
  • Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Pull force analysis

Maximum lifting force for a neodymium magnet – what contributes to it?

The declared magnet strength concerns the maximum value, obtained under laboratory conditions, meaning:
  • with the use of a sheet made of special test steel, ensuring full magnetic saturation
  • possessing a thickness of at least 10 mm to avoid saturation
  • with an ideally smooth touching surface
  • without the slightest clearance between the magnet and steel
  • for force acting at a right angle (in the magnet axis)
  • at temperature room level

Practical lifting capacity: influencing factors

During everyday use, the real power results from many variables, ranked from crucial:
  • Space between surfaces – even a fraction of a millimeter of separation (caused e.g. by veneer or unevenness) diminishes the magnet efficiency, often by half at just 0.5 mm.
  • Force direction – declared lifting capacity refers to detachment vertically. When applying parallel force, the magnet exhibits much less (typically approx. 20-30% of maximum force).
  • Plate thickness – too thin sheet does not close the flux, causing part of the power to be escaped to the other side.
  • Material type – the best choice is high-permeability steel. Cast iron may generate lower lifting capacity.
  • Surface condition – ground elements ensure maximum contact, which increases force. Uneven metal reduce efficiency.
  • Temperature – temperature increase results in weakening of force. It is worth remembering the maximum operating temperature for a given model.

Lifting capacity testing was carried out on plates with a smooth surface of suitable thickness, under a perpendicular pulling force, in contrast under attempts to slide the magnet the lifting capacity is smaller. Additionally, even a slight gap between the magnet and the plate decreases the lifting capacity.

Precautions when working with NdFeB magnets
Serious injuries

Pinching hazard: The attraction force is so immense that it can cause blood blisters, pinching, and broken bones. Use thick gloves.

Implant safety

Patients with a ICD have to keep an large gap from magnets. The magnetic field can stop the functioning of the life-saving device.

Sensitization to coating

Certain individuals experience a sensitization to nickel, which is the common plating for NdFeB magnets. Frequent touching might lead to a rash. We strongly advise wear protective gloves.

Handling rules

Handle with care. Rare earth magnets act from a distance and connect with massive power, often quicker than you can react.

Keep away from computers

Avoid bringing magnets close to a purse, computer, or screen. The magnetism can permanently damage these devices and erase data from cards.

Combustion hazard

Dust produced during machining of magnets is combustible. Avoid drilling into magnets without proper cooling and knowledge.

Heat warning

Avoid heat. NdFeB magnets are susceptible to temperature. If you require operation above 80°C, inquire about HT versions (H, SH, UH).

Eye protection

Despite metallic appearance, the material is delicate and not impact-resistant. Avoid impacts, as the magnet may shatter into sharp, dangerous pieces.

Product not for children

Only for adults. Tiny parts can be swallowed, leading to serious injuries. Store away from children and animals.

GPS and phone interference

Remember: neodymium magnets generate a field that confuses sensitive sensors. Keep a separation from your mobile, device, and navigation systems.

Warning! Learn more about hazards in the article: Magnet Safety Guide.