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neodymium magnets

We offer red color magnets Nd2Fe14B - our offer. All "neodymium magnets" on our website are in stock for immediate delivery (check the list). See the magnet pricing for more details see the magnet price list

Magnets for water searching F300 GOLD

Where to purchase very strong magnet? Magnetic holders in airtight and durable steel casing are excellent for use in variable and difficult weather, including snow and rain more information...

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Holders with magnets can be applied to facilitate production, underwater exploration, or finding space rocks from gold 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 [±0,1 mm]

29 mm

Height [±0,1 mm]

8 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

bulk discounts:

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Specifications along with shape of magnets can be checked on our force calculator.

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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 [±0,1 mm]
Height
8 mm [±0,1 mm]
Weight
18 g [±0,1 mm]
Load capacity ~ ?
6.4 kg / 62.76 N
Manufacturing Tolerance
± 0.1 mm

Magnetic properties of material N38

properties
values
units
coercivity bHc ?
860-915
kA/m
coercivity bHc ?
10.8-11.5
kOe
energy density [Min. - Max.] ?
287-303
BH max KJ/m
energy density [Min. - Max.] ?
36-38
BH max MGOe
remenance Br [Min. - Max.] ?
12.2-12.6
kGs
remenance Br [Min. - Max.] ?
1220-1260
T
actual internal force iHc
≥ 955
kA/m
actual internal force iHc
≥ 12
kOe
max. temperature ?
≤ 80
°C

Physical properties of NdFeB

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

The built-in thread allows for simple attachment of screws or other fastening elements, making them versatile, for example, in attaching signs, instruments, or markings. The rubber coating prevents scratching, which is important for sensitive finishes, such as coated metal or glass panels.
No! Magnetic holders are not recommended for people with pacemakers, as the strong magnetic field can affect their function. For these individuals, we advise using alternative fastening methods — we offer two such types in our range.

Advantages and disadvantages of neodymium magnets NdFeB.

Apart from their consistent magnetism, neodymium magnets have these key benefits:

  • Their power remains stable, and after approximately 10 years, it drops only by ~1% (according to research),
  • They are very resistant to demagnetization caused by external magnetic sources,
  • In other words, due to the glossy gold coating, the magnet obtains an stylish appearance,
  • They exhibit superior levels of magnetic induction near the outer area of the magnet,
  • With the right combination of magnetic alloys, they reach increased thermal stability, enabling operation at or above 230°C (depending on the form),
  • The ability for custom shaping and adjustment to specific needs – neodymium magnets can be manufactured in a wide range of shapes and sizes, which extends the scope of their use cases,
  • Key role in advanced technical fields – they are utilized in HDDs, electric motors, diagnostic apparatus and other advanced devices,
  • Thanks to their efficiency per volume, small magnets offer high magnetic performance, with minimal size,

Disadvantages of magnetic elements:

  • They can break when subjected to a powerful impact. If the magnets are exposed to physical collisions, we recommend in a protective case. The steel housing, in the form of a holder, protects the magnet from cracks , and at the same time reinforces its overall durability,
  • They lose power at elevated temperatures. Most neodymium magnets experience permanent loss in strength when heated above 80°C (depending on the geometry and height). However, we offer special variants with high temperature resistance that can operate up to 230°C or higher,
  • Magnets exposed to wet conditions can degrade. Therefore, for outdoor applications, we suggest waterproof types made of non-metallic composites,
  • The use of a protective casing or external holder is recommended, since machining fine details in neodymium magnets is not feasible,
  • Potential hazard linked to microscopic shards may arise, when consumed by mistake, which is significant in the context of child safety. Moreover, small elements from these assemblies might interfere with diagnostics after being swallowed,
  • High unit cost – neodymium magnets are more expensive than other types of magnets (e.g., ferrite), which can restrict large-scale applications

Safety Precautions

Neodymium magnets can become demagnetized at high temperatures.

Despite the general resilience of magnets, their ability to maintain their magnetic potency can be influenced by factors like the type of material used, the magnet's shape, and the intended purpose for which it is employed.

The magnet is coated with nickel - be careful if you have an allergy.

Studies clearly indicate a small percentage of people who suffer from metal allergies such as nickel. An allergic reaction often manifests as skin redness and rash. If you have a nickel allergy, try wearing gloves or avoid direct contact with nickel-plated neodymium magnets.

Neodymium magnets are known for being fragile, which can cause them to become damaged.

Magnets made of neodymium are delicate and will shatter if allowed to collide with each other, even from a distance of a few centimeters. Despite being made of metal and coated with a shiny nickel plating, they are not as hard as steel. In the case of a collision between two magnets, there can be a scattering of small sharp metal fragments in different directions. Protecting your eyes is essential.

Dust and powder from neodymium magnets are highly flammable.

Avoid drilling or mechanical processing of neodymium magnets. Once crushed into fine powder or dust, this material becomes highly flammable.

Neodymium magnets should not be near people with pacemakers.

Neodymium magnets generate strong magnetic fields. As a result, they interfere with the operation of a pacemaker. This happens because such devices have a function to deactivate them in a magnetic field.

Do not bring neodymium magnets close to GPS and smartphones.

Magnetic fields interfere with compasses and magnetometers used in navigation for air and sea transport, as well as internal compasses of smartphones and GPS devices.

Neodymium magnets can attract to each other, pinch the skin, and cause significant swellings.

If have a finger between or on the path of attracting magnets, there may be a large cut or a fracture.

 It is important to maintain neodymium magnets out of reach from youngest children.

Neodymium magnets are not toys. You cannot allow them to become toys for children. Small magnets pose a serious choking hazard or can attract to each other in the intestines. In such cases, the only solution is to undergo surgery to remove the magnets, and otherwise, it can even lead to death.

Neodymium magnets are among the most powerful magnets on Earth. The surprising force they generate between each other can shock you.

To handle magnets properly, it is best to familiarize yourself with our information beforehand. This will help you avoid significant harm to your body and the magnets themselves.

Keep neodymium magnets away from the wallet, computer, and TV.

Neodymium magnets generate strong magnetic fields that can destroy magnetic media such as floppy disks, video tapes, HDDs, credit cards, magnetic ID cards, cassette tapes, etc. devices. They can also damage devices like video players, televisions, CRT computer monitors. Remember not to place neodymium magnets close to these electronic devices.

Pay attention!

So you are aware of why neodymium magnets are so dangerous, read the article titled How dangerous are strong neodymium magnets?.

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e-mail: bok@dhit.pl

tel: +48 888 99 98 98