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UMGGZ 34x6 [M4] GZ / N38 - rubber magnetic holder external thread

rubber magnetic holder external thread

Catalog no 340311

GTIN/EAN: 5906301814733

5.00

Diameter Ø

34 mm [±1 mm]

Height

6 mm [±1 mm]

Weight

26 g

Load capacity

7.70 kg / 75.51 N

9.84 with VAT / pcs + price for transport

8.00 ZŁ net + 23% VAT / pcs

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Specifications along with structure of a neodymium magnet can be calculated with our magnetic calculator.

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Detailed specification - UMGGZ 34x6 [M4] GZ / N38 - rubber magnetic holder external thread

Specification / characteristics - UMGGZ 34x6 [M4] GZ / N38 - rubber magnetic holder external thread

properties
properties values
Cat. no. 340311
GTIN/EAN 5906301814733
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 34 mm [±1 mm]
Height 6 mm [±1 mm]
Weight 26 g
Load capacity ~ ? 7.70 kg / 75.51 N
Manufacturing Tolerance ±1 mm

Magnetic properties of material N38

Specification / characteristics UMGGZ 34x6 [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 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
Engineering data and GPSR
Chemical composition
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: 340311-2026
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Magnet pull force

Field Strength

Check out also proposals

The protruding thread allows instant screwing of a lamp or holder using a nut. Thanks to the rubber coating, the magnet is waterproof and does not scratch paint, which is crucial in automotive.
Yes, these holders are completely resistant to weather conditions thanks to the hermetic Santoprene rubber coating. 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. A clean surface under the magnet guarantees no scratches and maximum adhesion.
The length of the protruding screw is usually from 8 to 15 mm (you will find the exact dimension in the technical specification). It is a solid threaded connection made of galvanized steel, resistant to breaking.
Thanks to the multi-pole system (Multi-Pole), force is concentrated at the surface, giving a strong grip. For secure mounting on a car roof, we recommend using several holders (e.g., 3-4 pieces per lamp).

Advantages and disadvantages of rare earth magnets.

Pros

Besides their remarkable strength, neodymium magnets offer the following advantages:
  • They do not lose strength, even during around 10 years – the drop in strength is only ~1% (theoretically),
  • Neodymium magnets are characterized by exceptionally resistant to magnetic field loss caused by external interference,
  • In other words, due to the glossy finish of nickel, the element becomes visually attractive,
  • Magnetic induction on the working layer of the magnet remains impressive,
  • Through (appropriate) combination of ingredients, they can achieve high thermal resistance, enabling operation at temperatures approaching 230°C and above...
  • Thanks to versatility in forming and the capacity to adapt to client solutions,
  • Huge importance in innovative solutions – they find application in mass storage devices, drive modules, advanced medical instruments, and industrial machines.
  • Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Disadvantages

Disadvantages of neodymium magnets:
  • To avoid cracks under impact, we recommend using special steel holders. Such a solution secures the magnet and simultaneously increases its durability.
  • We warn that neodymium magnets can reduce their strength at high temperatures. To prevent this, we suggest our specialized [AH] magnets, which work effectively even at 230°C.
  • When exposed to humidity, magnets usually rust. To use them in conditions outside, it is recommended to use protective magnets, such as those in rubber or plastics, which secure oxidation and corrosion.
  • We suggest a housing - magnetic holder, due to difficulties in realizing nuts inside the magnet and complicated shapes.
  • Possible danger resulting from small fragments of magnets pose a threat, in case of ingestion, which gains importance in the context of child health protection. Furthermore, small elements of these devices are able to disrupt the diagnostic process medical in case of swallowing.
  • Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Lifting parameters

Breakaway strength of the magnet in ideal conditionswhat contributes to it?

The force parameter is a measurement result performed under specific, ideal conditions:
  • using a base made of mild steel, functioning as a circuit closing element
  • with a thickness of at least 10 mm
  • characterized by smoothness
  • without the slightest air gap between the magnet and steel
  • for force acting at a right angle (pull-off, not shear)
  • at standard ambient temperature

Lifting capacity in practice – influencing factors

Real force impacted by specific conditions, including (from priority):
  • Distance – the presence of foreign body (paint, dirt, air) acts as an insulator, which lowers power steeply (even by 50% at 0.5 mm).
  • Force direction – catalog parameter refers to pulling vertically. When applying parallel force, the magnet holds significantly lower power (often approx. 20-30% of nominal force).
  • Metal thickness – thin material does not allow full use of the magnet. Magnetic flux penetrates through instead of converting into lifting capacity.
  • Plate material – mild steel attracts best. Higher carbon content lower magnetic properties and holding force.
  • Surface condition – ground elements ensure maximum contact, which increases force. Rough surfaces weaken the grip.
  • Temperature – heating the magnet causes a temporary drop of induction. It is worth remembering the thermal limit for a given model.

Holding force was tested on the plate surface of 20 mm thickness, when a perpendicular force was applied, whereas under shearing force the lifting capacity is smaller. Additionally, even a small distance between the magnet’s surface and the plate lowers the holding force.

Safety rules for work with neodymium magnets
Dust explosion hazard

Combustion risk: Rare earth powder is highly flammable. Avoid machining magnets in home conditions as this may cause fire.

Choking Hazard

Absolutely keep magnets away from children. Choking hazard is significant, and the effects of magnets connecting inside the body are life-threatening.

ICD Warning

Health Alert: Strong magnets can turn off heart devices and defibrillators. Do not approach if you have medical devices.

Sensitization to coating

Nickel alert: The nickel-copper-nickel coating consists of nickel. If skin irritation occurs, immediately stop handling magnets and wear gloves.

Safe operation

Use magnets with awareness. Their powerful strength can surprise even professionals. Be vigilant and respect their force.

Maximum temperature

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

Beware of splinters

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

Impact on smartphones

A strong magnetic field negatively affects the functioning of compasses in phones and GPS navigation. Maintain magnets close to a smartphone to avoid damaging the sensors.

Protect data

Intense magnetic fields can corrupt files on credit cards, HDDs, and other magnetic media. Keep a distance of min. 10 cm.

Hand protection

Big blocks can crush fingers instantly. Under no circumstances place your hand between two attracting surfaces.

Attention! Learn more about hazards in the article: Safety of working with magnets.