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neodymium magnets

We offer blue color magnets Nd2Fe14B - our proposal. All "neodymium magnets" on our website are available for immediate purchase (check the list). See the magnet price list for more details see the magnet price list

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Where to purchase very strong neodymium magnet? Holders with magnets in airtight and durable enclosure are excellent for use in difficult weather, including during snow and rain more information

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UMGGW 29x8 [M4] GW / N38 - magnetic holder rubber internal thread

magnetic holder rubber internal thread

Catalog no 160305

GTIN: 5906301813637

5

Diameter Ø

29 mm [±1 mm]

Height

8 mm [±1 mm]

Weight

18 g

Load capacity

6.4 kg / 62.76 N

8.61 with VAT / pcs + price for transport

7.00 ZŁ net + 23% VAT / pcs

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UMGGW 29x8 [M4] GW / N38 - magnetic holder rubber internal thread
Specification/characteristics UMGGW 29x8 [M4] GW / N38 - magnetic holder rubber internal thread
properties
values
Cat. no.
160305
GTIN
5906301813637
Production/Distribution
Dhit sp. z o.o.
Country of origin
Poland / China / Germany
Customs code
85059029
Diameter Ø
29 mm [±1 mm]
Height
8 mm [±1 mm]
Weight
18 g
Load capacity ~ ?
6.4 kg / 62.76 N
Manufacturing Tolerance
±1 mm

Magnetic properties of material N38

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

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

Shopping tips

Magnets in rubber were created for safe mounting on delicate painted surfaces, such as car bodies or machine casings. They are commonly used in the advertising industry (car wrapping, foil fixing), lighting (LED work lamps), and mobile monitoring. 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 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.
You can screw any metric bolt, hook, handle, cable holder into the magnet or screw the device housing directly. This enables quick creation of a magnetic base for work lighting, reversing cameras, sensors, or advertising boards.
Inside there are several magnets arranged with alternating poles on a steel plate, which closes the magnetic field close to the surface. This is much safer for electronics inside the vehicle (e.g., under the roof) compared to regular magnets.

Advantages as well as disadvantages of neodymium magnets.

Besides their stability, neodymium magnets are valued for these benefits:

  • They virtually do not lose strength, because even after ten years the performance loss is only ~1% (in laboratory conditions),
  • Magnets perfectly protect themselves against demagnetization caused by ambient magnetic noise,
  • Thanks to the elegant finish, the surface of nickel, gold, or silver gives an professional appearance,
  • The surface of neodymium magnets generates a concentrated magnetic field – this is a distinguishing feature,
  • Neodymium magnets are characterized by very high magnetic induction on the magnet surface and are able to act (depending on the shape) even at a temperature of 230°C or more...
  • In view of the possibility of accurate shaping and customization to specialized requirements, NdFeB magnets can be produced in a wide range of geometric configurations, which increases their versatility,
  • Wide application in advanced technology sectors – they are commonly used in computer drives, motor assemblies, advanced medical instruments, and complex engineering applications.
  • Compactness – despite small sizes they generate large force, making them ideal for precision applications

Cons of neodymium magnets: application proposals

  • Susceptibility to cracking 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 raises their durability
  • Neodymium magnets lose force when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of power (a factor is the shape as well as dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are extremely resistant to heat
  • Magnets exposed to a humid environment can rust. Therefore during using outdoors, we suggest using water-impermeable magnets made of rubber, plastic or other material resistant to moisture
  • Due to limitations in realizing nuts and complex shapes in magnets, we recommend using casing - magnetic holder.
  • Potential hazard resulting from small fragments of magnets are risky, in case of ingestion, which becomes key in the context of child safety. It is also worth noting that small components of these devices are able to disrupt the diagnostic process medical in case of swallowing.
  • Due to neodymium price, their price is higher than average,

Maximum magnetic pulling forcewhat affects it?

Breakaway force is the result of a measurement for the most favorable conditions, assuming:

  • with the application of a sheet made of low-carbon steel, guaranteeing maximum field concentration
  • with a thickness no less than 10 mm
  • characterized by smoothness
  • without the slightest air gap between the magnet and steel
  • under vertical force vector (90-degree angle)
  • in neutral thermal conditions

Lifting capacity in practice – influencing factors

Bear in mind that the magnet holding may be lower influenced by the following factors, in order of importance:

  • Air gap (between the magnet and the plate), because even a very small clearance (e.g. 0.5 mm) can cause a decrease in force by up to 50% (this also applies to paint, corrosion or debris).
  • Force direction – note that the magnet has greatest strength perpendicularly. Under shear forces, the capacity drops significantly, often to levels of 20-30% of the maximum value.
  • Steel thickness – insufficiently thick sheet does not accept the full field, causing part of the flux to be lost into the air.
  • Material type – the best choice is high-permeability steel. Cast iron may generate lower lifting capacity.
  • Surface quality – the smoother and more polished the plate, the larger the contact zone and higher the lifting capacity. Roughness creates an air distance.
  • Heat – neodymium magnets have a negative temperature coefficient. At higher temperatures they are weaker, and at low temperatures they can be stronger (up to a certain limit).

* Lifting capacity was determined by applying a steel plate with a smooth surface of suitable thickness (min. 20 mm), under vertically applied force, in contrast under parallel forces the holding force is lower. In addition, even a slight gap {between} the magnet’s surface and the plate lowers the load capacity.

Precautions when working with NdFeB magnets

Dust explosion hazard

Fire hazard: Rare earth powder is highly flammable. Avoid machining magnets without safety gear as this risks ignition.

Handling rules

Before starting, read the rules. Sudden snapping can break the magnet or hurt your hand. Think ahead.

Hand protection

Large magnets can break fingers instantly. Never put your hand betwixt two attracting surfaces.

ICD Warning

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

Adults only

Absolutely store magnets out of reach of children. Risk of swallowing is high, and the consequences of magnets connecting inside the body are very dangerous.

Avoid contact if allergic

Medical facts indicate that nickel (the usual finish) is a strong allergen. If you have an allergy, prevent direct skin contact or choose coated magnets.

Permanent damage

Watch the temperature. Exposing the magnet to high heat will permanently weaken its magnetic structure and pulling force.

Risk of cracking

Protect your eyes. Magnets can fracture upon violent connection, launching shards into the air. Wear goggles.

Keep away from computers

Data protection: Neodymium magnets can ruin data carriers and delicate electronics (pacemakers, medical aids, mechanical watches).

GPS Danger

An intense magnetic field negatively affects the operation of magnetometers in phones and GPS navigation. Do not bring magnets near a smartphone to avoid damaging the sensors.

Important!

Looking for details? Check our post: Are neodymium magnets dangerous?

Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98