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UMGGW 22x6 [M4] GW / N38 - magnetic holder rubber internal thread

magnetic holder rubber internal thread

Catalog no 160304

GTIN/EAN: 5906301813620

5.00
Load capacity 5.10 kg / 50.01 N
Diameter Ø
22 mm [±1 mm]
Height
6 mm [±1 mm]
Weight
12 g

How we measure these parameters — certificates and measurements

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6.00 zł net / pcs

7.38 zł with VAT (23% VAT) / pcs

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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

Want to talk magnets?

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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Product card - UMGGW 22x6 [M4] GW / N38 - magnetic holder rubber internal thread

Specification / characteristics - UMGGW 22x6 [M4] GW / N38 - magnetic holder rubber internal thread

properties
properties values
Cat. no. 160304
GTIN/EAN 5906301813620
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 22 mm [±1 mm]
Height 6 mm [±1 mm]
Weight 12 g
Load capacity ~ ? 5.10 kg / 50.01 N
Manufacturing Tolerance ±1 mm

Magnetic properties of material N38

Specification / characteristics UMGGW 22x6 [M4] 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

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%

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: 160304-2026
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Force (pull)

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Magnets in rubber were created for non-invasive 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 mobility counts. 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 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). 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.
The standard metric thread allows easy integration with most accessories available on the market. Just remember to choose the appropriate screw length – too long can push the rubber from the bottom and damage the paint.
Such an arrangement makes the field very strong right at the rubber (high lifting capacity) but quickly fades with distance. This is much safer for electronics inside the vehicle (e.g., under the roof) compared to regular magnets.

Advantages and disadvantages of rare earth magnets.

Advantages

In addition to their pulling strength, neodymium magnets provide the following advantages:
  • Their magnetic field remains stable, and after around 10 years it decreases only by ~1% (according to research),
  • They retain their magnetic properties even under strong external field,
  • In other words, due to the aesthetic finish of nickel, the element gains a professional look,
  • Neodymium magnets deliver maximum magnetic induction on a small surface, which ensures high operational effectiveness,
  • Neodymium magnets are characterized by very high magnetic induction on the magnet surface and can function (depending on the shape) even at a temperature of 230°C or more...
  • Thanks to versatility in forming and the ability to customize to unusual requirements,
  • Huge importance in high-tech industry – they are used in mass storage devices, electric drive systems, advanced medical instruments, also other advanced devices.
  • Thanks to concentrated force, small magnets offer high operating force, with minimal size,

Disadvantages

Disadvantages of neodymium magnets:
  • At strong impacts they can crack, therefore we recommend placing them in strong housings. A metal housing provides additional protection against damage and increases the magnet's durability.
  • Neodymium magnets decrease their strength 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 durability even at temperatures up to 230°C
  • Due to the susceptibility of magnets to corrosion in a humid environment, we recommend using waterproof magnets made of rubber, plastic or other material immune to moisture, in case of application outdoors
  • Due to limitations in creating threads and complicated shapes in magnets, we propose using casing - magnetic holder.
  • Possible danger to health – tiny shards of magnets are risky, in case of ingestion, which becomes key in the context of child health protection. Furthermore, small components of these devices are able to be problematic in diagnostics medical in case of swallowing.
  • With mass production the cost of neodymium magnets can be a barrier,

Pull force analysis

Maximum lifting force for a neodymium magnet – what affects it?

Breakaway force is the result of a measurement for ideal contact conditions, including:
  • using a plate made of high-permeability steel, acting as a ideal flux conductor
  • with a thickness of at least 10 mm
  • with an ground touching surface
  • under conditions of no distance (surface-to-surface)
  • under perpendicular force direction (90-degree angle)
  • in stable room temperature

Practical aspects of lifting capacity – factors

Please note that the working load will differ subject to elements below, in order of importance:
  • Space between magnet and steel – every millimeter of separation (caused e.g. by varnish or unevenness) diminishes the pulling force, often by half at just 0.5 mm.
  • Loading method – declared lifting capacity refers to pulling vertically. When attempting to slide, the magnet holds much less (typically approx. 20-30% of nominal force).
  • Metal thickness – thin material does not allow full use of the magnet. Part of the magnetic field penetrates through instead of generating force.
  • Material composition – different alloys reacts the same. Alloy additives weaken the interaction with the magnet.
  • Surface finish – ideal contact is obtained only on smooth steel. Any scratches and bumps create air cushions, weakening the magnet.
  • Thermal conditions – NdFeB sinters have a negative temperature coefficient. When it is hot they are weaker, and at low temperatures gain strength (up to a certain limit).

Holding force was measured on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, in contrast under parallel forces the load capacity is reduced by as much as fivefold. Moreover, even a minimal clearance between the magnet and the plate decreases the lifting capacity.

Safe handling of NdFeB magnets
Dust is flammable

Machining of NdFeB material poses a fire hazard. Neodymium dust oxidizes rapidly with oxygen and is hard to extinguish.

Life threat

Patients with a pacemaker must keep an large gap from magnets. The magnetism can stop the functioning of the life-saving device.

Do not overheat magnets

Regular neodymium magnets (N-type) lose power when the temperature exceeds 80°C. Damage is permanent.

Choking Hazard

Neodymium magnets are not intended for children. Swallowing several magnets may result in them connecting inside the digestive tract, which poses a critical condition and requires urgent medical intervention.

Do not underestimate power

Handle magnets consciously. Their huge power can surprise even professionals. Be vigilant and do not underestimate their force.

GPS and phone interference

A powerful magnetic field negatively affects the functioning of magnetometers in phones and GPS navigation. Do not bring magnets near a smartphone to prevent damaging the sensors.

Eye protection

Despite the nickel coating, the material is brittle and not impact-resistant. Avoid impacts, as the magnet may shatter into sharp, dangerous pieces.

Crushing risk

Protect your hands. Two powerful magnets will join instantly with a force of several hundred kilograms, destroying everything in their path. Exercise extreme caution!

Nickel allergy

Allergy Notice: The Ni-Cu-Ni coating contains nickel. If redness happens, immediately stop handling magnets and wear gloves.

Safe distance

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

Security! Details about risks in the article: Magnet Safety Guide.