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UMGGZ 22x6 [M4] GZ / N38 - rubber magnetic holder external thread

rubber magnetic holder external thread

Catalog no 340310

GTIN/EAN: 5906301814726

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

6.00 zł net / pcs

7.38 zł with VAT (23% VAT) / pcs

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price from 50 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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Technical parameters - UMGGZ 22x6 [M4] GZ / N38 - rubber magnetic holder external thread

Specification / characteristics - UMGGZ 22x6 [M4] GZ / N38 - rubber magnetic holder external thread

properties
properties values
Cat. no. 340310
GTIN/EAN 5906301814726
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 15 g
Load capacity ~ ? 5.10 kg / 50.01 N
Manufacturing Tolerance ±1 mm

Magnetic properties of material N38

Specification / characteristics UMGGZ 22x6 [M4] GZ / N38 - rubber magnetic holder external 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 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
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: 340310-2026
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This type of holder is standard when mounting lighting (beacons), antennas, searchlights, and cameras on a car roof. It is a safe and durable mounting without drilling holes in the bodywork.
The magnet is tightly sealed with rubber, which protects it from water, road salt, mud, and corrosion. This is the best, professional solution for mounting on a vehicle roof.
Soft rubber provides a barrier between the hard magnet and the paint, eliminating the risk of scratches. Rubber has a high coefficient of friction, ensuring stability even with vibrations and wind.
The length of the protruding screw is usually from 8 to 15 mm (you will find the exact dimension in the technical specification). Allows easy lamp mounting by passing the screw through the hole in the holder and tightening the nut.
Thanks to the multi-pole system (Multi-Pole), force is concentrated at the surface, giving a strong grip. Holding force depends on the roof sheet thickness.

Strengths as well as weaknesses of neodymium magnets.

Pros

Besides their tremendous magnetic power, neodymium magnets offer the following advantages:
  • They do not lose power, even after nearly ten years – the reduction in strength is only ~1% (theoretically),
  • Neodymium magnets are characterized by remarkably resistant to demagnetization caused by external interference,
  • Thanks to the elegant finish, the plating of nickel, gold-plated, or silver gives an aesthetic appearance,
  • Magnetic induction on the working layer of the magnet remains impressive,
  • Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their shape) at temperatures up to 230°C and above...
  • Thanks to modularity in designing and the ability to customize to complex applications,
  • Fundamental importance in modern technologies – they find application in magnetic memories, electric drive systems, advanced medical instruments, and other advanced devices.
  • Thanks to their power density, small magnets offer high operating force, in miniature format,

Limitations

Disadvantages of NdFeB magnets:
  • They are prone to damage upon too strong impacts. To avoid cracks, it is worth protecting magnets using a steel holder. Such protection not only shields the magnet but also improves its resistance to damage
  • Neodymium magnets decrease their strength under the influence of heating. As soon as 80°C is exceeded, many of them start losing their power. Therefore, we recommend our special magnets marked [AH], which maintain durability even at temperatures up to 230°C
  • Magnets exposed to a humid environment can rust. Therefore while using outdoors, we advise using waterproof magnets made of rubber, plastic or other material protecting against moisture
  • Limited ability of producing threads in the magnet and complicated shapes - recommended is a housing - magnetic holder.
  • Health risk to health – tiny shards of magnets can be dangerous, when accidentally swallowed, which is particularly important in the context of child health protection. Furthermore, small components of these products can complicate diagnosis medical when they are in the body.
  • Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Pull force analysis

Maximum lifting capacity of the magnet – what it depends on?

The load parameter shown concerns the limit force, recorded under optimal environment, meaning:
  • using a base made of high-permeability steel, acting as a ideal flux conductor
  • with a cross-section no less than 10 mm
  • with an polished touching surface
  • under conditions of ideal adhesion (metal-to-metal)
  • for force applied at a right angle (in the magnet axis)
  • at conditions approx. 20°C

Determinants of lifting force in real conditions

Holding efficiency is affected by specific conditions, mainly (from priority):
  • Clearance – the presence of foreign body (rust, tape, air) acts as an insulator, which lowers power steeply (even by 50% at 0.5 mm).
  • Loading method – declared lifting capacity refers to pulling vertically. When attempting to slide, the magnet exhibits much less (often approx. 20-30% of maximum force).
  • Element thickness – to utilize 100% power, the steel must be adequately massive. Paper-thin metal restricts the attraction force (the magnet "punches through" it).
  • Material composition – not every steel attracts identically. Alloy additives worsen the attraction effect.
  • Plate texture – smooth surfaces ensure maximum contact, which improves field saturation. Uneven metal reduce efficiency.
  • Thermal environment – heating the magnet causes a temporary drop of induction. It is worth remembering the maximum operating temperature for a given model.

Lifting capacity testing was conducted on plates with a smooth surface of suitable thickness, under a perpendicular pulling force, in contrast under attempts to slide the magnet the load capacity is reduced by as much as fivefold. Moreover, even a slight gap between the magnet and the plate reduces the holding force.

Safety rules for work with NdFeB magnets
Phone sensors

Remember: neodymium magnets produce a field that interferes with sensitive sensors. Maintain a separation from your mobile, tablet, and navigation systems.

Physical harm

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

Danger to pacemakers

Warning for patients: Powerful magnets affect medical devices. Maintain at least 30 cm distance or ask another person to work with the magnets.

Allergic reactions

Nickel alert: The nickel-copper-nickel coating consists of nickel. If redness appears, cease working with magnets and use protective gear.

Electronic hazard

Data protection: Strong magnets can damage payment cards and sensitive devices (pacemakers, medical aids, mechanical watches).

Safe operation

Exercise caution. Rare earth magnets attract from a distance and connect with massive power, often quicker than you can move away.

Product not for children

NdFeB magnets are not intended for children. Swallowing multiple magnets can lead to them pinching intestinal walls, which poses a critical condition and requires urgent medical intervention.

Fragile material

Neodymium magnets are ceramic materials, meaning they are prone to chipping. Impact of two magnets leads to them breaking into small pieces.

Demagnetization risk

Standard neodymium magnets (grade N) lose magnetization when the temperature surpasses 80°C. This process is irreversible.

Combustion hazard

Drilling and cutting of neodymium magnets carries a risk of fire risk. Magnetic powder oxidizes rapidly with oxygen and is difficult to extinguish.

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