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neodymium magnets

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

magnetic holder rubber internal thread

Catalog no 160306

GTIN: 5906301813644

5.00

Diameter Ø

34 mm [±1 mm]

Height

8 mm [±1 mm]

Weight

22 g

Load capacity

7.7 kg / 75.51 N

9.84 with VAT / pcs + price for transport

8.00 ZŁ net + 23% VAT / pcs

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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 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 ~ ? 7.7 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 T
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 106 °C-1
Thermal expansion perpendicular (⊥) to orientation (M) -(1-3) x 10-6 °C-1
Young's modulus 1.7 x 104 kg/mm²

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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.
Yes, thanks to the tight rubber coating, these magnets are fully waterproof and protected against corrosion. 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.
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 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.
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 7.7 kg despite the distance created by the rubber layer.

Pros as well as cons of neodymium magnets.

Besides their magnetic performance, neodymium magnets are valued for these benefits:

  • Their strength is durable, and after around 10 years it decreases only by ~1% (theoretically),
  • They maintain their magnetic properties even under close interference source,
  • The use of an refined finish of noble metals (nickel, gold, silver) causes the element to present itself better,
  • Neodymium magnets achieve maximum magnetic induction on a small area, which increases force concentration,
  • Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their form) at temperatures up to 230°C and above...
  • Thanks to versatility in shaping and the capacity to modify to individual projects,
  • Significant place in advanced technology sectors – they are commonly used in HDD drives, electric drive systems, medical equipment, as well as technologically advanced constructions.
  • Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in small dimensions, which allows their use in small systems

Disadvantages of NdFeB magnets:

  • Brittleness is one of their disadvantages. Upon intense impact they can fracture. We recommend keeping them in a strong case, which not only protects them against impacts but also increases their durability
  • Neodymium magnets decrease their force 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 stability even at temperatures up to 230°C
  • Magnets exposed to a humid environment can corrode. Therefore during using outdoors, we suggest using waterproof magnets made of rubber, plastic or other material resistant to moisture
  • Due to limitations in creating nuts and complex forms in magnets, we propose using casing - magnetic mount.
  • Health risk resulting from small fragments of magnets pose a threat, in case of ingestion, which is particularly important in the context of child health protection. Additionally, tiny parts of these devices can disrupt the diagnostic process medical after entering the body.
  • High unit price – neodymium magnets cost more than other types of magnets (e.g. ferrite), which hinders application in large quantities

Optimal lifting capacity of a neodymium magnetwhat affects it?

The specified lifting capacity refers to the limit force, recorded under laboratory conditions, specifically:

  • with the contact of a sheet made of special test steel, guaranteeing maximum field concentration
  • possessing a massiveness of min. 10 mm to ensure full flux closure
  • with an ideally smooth contact surface
  • under conditions of no distance (metal-to-metal)
  • for force applied at a right angle (pull-off, not shear)
  • at room temperature

Practical lifting capacity: influencing factors

In practice, the actual lifting capacity is determined by many variables, listed from the most important:

  • Space between magnet and steel – even a fraction of a millimeter of separation (caused e.g. by veneer or unevenness) significantly weakens the magnet efficiency, often by half at just 0.5 mm.
  • Force direction – declared lifting capacity refers to detachment vertically. When attempting to slide, the magnet exhibits significantly lower power (typically approx. 20-30% of nominal force).
  • Wall thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field passes through the material instead of converting into lifting capacity.
  • Material composition – different alloys reacts the same. High carbon content weaken the attraction effect.
  • Surface quality – the more even the surface, the larger the contact zone and higher the lifting capacity. Unevenness creates an air distance.
  • Thermal factor – high temperature weakens magnetic field. Too high temperature can permanently damage the magnet.

* Lifting capacity was assessed with the use of a polished steel plate of suitable thickness (min. 20 mm), under vertically applied force, however under attempts to slide the magnet the holding force is lower. In addition, even a small distance {between} the magnet’s surface and the plate reduces the load capacity.

Safety rules for work with NdFeB magnets

Do not overheat magnets

Regular neodymium magnets (grade N) lose power when the temperature surpasses 80°C. The loss of strength is permanent.

Warning for allergy sufferers

Nickel alert: The Ni-Cu-Ni coating contains nickel. If redness occurs, immediately stop handling magnets and use protective gear.

Fire risk

Machining of NdFeB material carries a risk of fire risk. Neodymium dust reacts violently with oxygen and is difficult to extinguish.

Safe operation

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

Magnetic media

Avoid bringing magnets near a purse, laptop, or screen. The magnetic field can permanently damage these devices and erase data from cards.

Precision electronics

A powerful magnetic field disrupts the operation of compasses in smartphones and GPS navigation. Keep magnets near a device to avoid breaking the sensors.

Fragile material

Despite metallic appearance, neodymium is delicate and cannot withstand shocks. Do not hit, as the magnet may shatter into hazardous fragments.

Pacemakers

People with a pacemaker must keep an safe separation from magnets. The magnetic field can disrupt the functioning of the life-saving device.

Product not for children

Strictly store magnets away from children. Risk of swallowing is significant, and the consequences of magnets connecting inside the body are fatal.

Crushing force

Risk of injury: The pulling power is so immense that it can result in hematomas, pinching, and even bone fractures. Protective gloves are recommended.

Caution!

Need more info? Read our article: Why are neodymium magnets dangerous?

Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98