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UMGGW 34x8 [M4] GW / N38 - magnetic holder rubber internal thread

magnetic holder rubber internal thread

Catalog no 160306

GTIN/EAN: 5906301813644

5.00
Load capacity 7.70 kg / 75.51 N
Diameter Ø
34 mm [±1 mm]
Height
8 mm [±1 mm]
Weight
22 g
product specifications »

9.84 zł with VAT / pcs + price for transport

8.00 zł net + 23% VAT / pcs

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Technical data - UMGGW 34x8 [M4] GW / N38 - magnetic holder rubber internal thread

Specification / characteristics - UMGGW 34x8 [M4] GW / N38 - magnetic holder rubber internal thread

properties
properties values
Cat. no. 160306
GTIN/EAN 5906301813644
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 8 mm [±1 mm]
Weight 22 g
Load capacity ~ ? 7.70 kg / 75.51 N
Manufacturing Tolerance ±1 mm

Magnetic properties of material N38

Specification / characteristics UMGGW 34x8 [M4] 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 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
Technical and environmental data

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%

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: 160306-2026
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Magnets in rubber were created for non-invasive mounting on delicate 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 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 durability. 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.
Although rubber creates a small distance reducing perpendicular pull-off force, it drastically increases resistance when trying to slide the magnet across the surface. 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 holder is equipped with a steel bushing with an internal thread (you will find the thread size in the product name, e.g., M4, M6, M8). Just remember to choose the appropriate screw length – too long can push the rubber from the bottom and damage the paint.
Inside there are several magnets arranged with alternating poles on a steel plate, which closes the magnetic field close to the surface. Field concentration allows achieving high holding force 7.70 kg despite the distance created by the rubber layer.

Pros as well as cons of Nd2Fe14B magnets.

Advantages

Besides their remarkable magnetic power, neodymium magnets offer the following advantages:
  • They retain attractive force for nearly 10 years – the loss is just ~1% (according to analyses),
  • Magnets perfectly resist against demagnetization caused by external fields,
  • Thanks to the smooth finish, the surface of Ni-Cu-Ni, gold, or silver gives an professional appearance,
  • Neodymium magnets ensure maximum magnetic induction on a contact point, which allows for strong attraction,
  • Due to their durability and thermal resistance, neodymium magnets can operate (depending on the form) even at high temperatures reaching 230°C or more...
  • Possibility of exact creating as well as optimizing to defined needs,
  • Key role in high-tech industry – they serve a role in HDD drives, brushless drives, advanced medical instruments, and technologically advanced constructions.
  • Compactness – despite small sizes they generate large force, making them ideal for precision applications

Disadvantages

Drawbacks and weaknesses of neodymium magnets: tips and applications.
  • Brittleness is one of their disadvantages. Upon strong impact they can fracture. We recommend keeping them in a steel housing, which not only protects them against impacts but also increases their durability
  • We warn that neodymium magnets can lose 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 prevent oxidation and corrosion.
  • We suggest a housing - magnetic mount, due to difficulties in creating threads inside the magnet and complex shapes.
  • Possible danger related to microscopic parts of magnets pose a threat, in case of ingestion, which is particularly important in the context of child safety. Additionally, small elements of these devices can complicate diagnosis medical after entering the body.
  • High unit price – neodymium magnets have a higher price than other types of magnets (e.g. ferrite), which can limit application in large quantities

Lifting parameters

Maximum holding power of the magnet – what affects it?

Information about lifting capacity was determined for the most favorable conditions, assuming:
  • with the application of a yoke made of special test steel, guaranteeing maximum field concentration
  • with a cross-section no less than 10 mm
  • with an ground contact surface
  • with zero gap (no coatings)
  • under vertical application of breakaway force (90-degree angle)
  • at ambient temperature approx. 20 degrees Celsius

Practical lifting capacity: influencing factors

In real-world applications, the actual lifting capacity results from several key aspects, ranked from most significant:
  • Distance (betwixt the magnet and the metal), because even a tiny distance (e.g. 0.5 mm) can cause a reduction in lifting capacity by up to 50% (this also applies to paint, rust or dirt).
  • Pull-off angle – remember that the magnet holds strongest perpendicularly. Under shear forces, the holding force drops significantly, often to levels of 20-30% of the nominal value.
  • Plate thickness – too thin sheet causes magnetic saturation, causing part of the power to be lost into the air.
  • Metal type – different alloys reacts the same. High carbon content weaken the attraction effect.
  • Plate texture – smooth surfaces guarantee perfect abutment, which improves force. Rough surfaces reduce efficiency.
  • Temperature influence – hot environment weakens pulling force. Exceeding the limit temperature can permanently demagnetize the magnet.

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 holding force is lower. In addition, even a slight gap between the magnet and the plate reduces the lifting capacity.

Warnings
Conscious usage

Before use, check safety instructions. Uncontrolled attraction can break the magnet or injure your hand. Be predictive.

Fire warning

Fire hazard: Rare earth powder is highly flammable. Avoid machining magnets in home conditions as this risks ignition.

Demagnetization risk

Keep cool. NdFeB magnets are susceptible to heat. If you need resistance above 80°C, ask us about special high-temperature series (H, SH, UH).

Keep away from children

Only for adults. Tiny parts pose a choking risk, causing severe trauma. Keep away from kids and pets.

Allergic reactions

Some people suffer from a contact allergy to nickel, which is the common plating for NdFeB magnets. Frequent touching can result in skin redness. We recommend wear protective gloves.

Pacemakers

Life threat: Neodymium magnets can turn off heart devices and defibrillators. Stay away if you have medical devices.

Data carriers

Do not bring magnets close to a purse, laptop, or screen. The magnetic field can irreversibly ruin these devices and wipe information from cards.

Material brittleness

Beware of splinters. Magnets can explode upon uncontrolled impact, launching sharp fragments into the air. Wear goggles.

Serious injuries

Risk of injury: The pulling power is so immense that it can cause hematomas, pinching, and broken bones. Use thick gloves.

Compass and GPS

Note: neodymium magnets produce a field that confuses sensitive sensors. Keep a safe distance from your mobile, tablet, and navigation systems.

Caution! More info about risks in the article: Magnet Safety Guide.