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neodymium magnets

We provide yellow color magnetic Nd2Fe14B - our proposal. All magnesy neodymowe on our website are in stock for immediate delivery (check the list). See the magnet price list for more details see the magnet price list

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HH 25x7.7 [M5] / N38 - through hole magnetic holder

through hole magnetic holder

Catalog no 370482

GTIN: 5906301814924

5.00

Diameter Ø

25 mm [±1 mm]

Height

7.7 mm [±1 mm]

Weight

23.8 g

Magnetization Direction

↑ axial

Load capacity

17.00 kg / 166.71 N

Coating

[NiCuNi] Nickel

11.44 with VAT / pcs + price for transport

9.30 ZŁ net + 23% VAT / pcs

bulk discounts:

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Weight and shape of a neodymium magnet can be checked with our online calculation tool.

Orders placed before 14:00 will be shipped the same business day.

HH 25x7.7 [M5] / N38 - through hole magnetic holder

Specification / characteristics HH 25x7.7 [M5] / N38 - through hole magnetic holder

properties
properties values
Cat. no. 370482
GTIN 5906301814924
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 25 mm [±1 mm]
Height 7.7 mm [±1 mm]
Weight 23.8 g
Magnetization Direction ↑ axial
Load capacity ~ ? 17.00 kg / 166.71 N
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±1 mm

Magnetic properties of material N38

Specification / characteristics HH 25x7.7 [M5] / N38 - through hole magnetic holder
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

Other offers

Unlike the countersunk version, the hole can be straight (for a cylindrical head screw) or with a recess (depending on the model). They are used as bumpers, door stops, flap holders, and mounting elements in machines.
The magnet inside is brittle, so we advise against using impact drivers. Correct mounting guarantees long holder life without cracks.
Yes, the steel housing (cup) acts as a screen directing the entire magnetic field to one side. Air gap, rust, or paint weaken the magnet's action.
These holders are ideal for mounting on non-magnetic surfaces such as wood, furniture board, plasterboard, or plastic. Can be used to build jigs in the workshop or mount lighting.
This protection shields against moisture in indoor conditions but is not 100% waterproof. With constant contact with water or in rain, corrosion may appear on the housing.

Pros as well as cons of rare earth magnets.

In addition to their magnetic capacity, neodymium magnets provide the following advantages:

  • Their power is maintained, and after approximately ten years it drops only by ~1% (theoretically),
  • They are extremely resistant to demagnetization induced by external magnetic fields,
  • A magnet with a smooth silver surface is more attractive,
  • The surface of neodymium magnets generates a maximum magnetic field – this is a key feature,
  • Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their shape) at temperatures up to 230°C and above...
  • Thanks to flexibility in constructing and the capacity to adapt to client solutions,
  • Huge importance in innovative solutions – they serve a role in computer drives, electric drive systems, diagnostic systems, and technologically advanced constructions.
  • Thanks to concentrated force, small magnets offer high operating force, occupying minimum space,

Characteristics of disadvantages of neodymium magnets: tips and applications.

  • At very strong impacts they can break, therefore we recommend placing them in strong housings. A metal housing provides additional protection against damage, as well as increases the magnet's 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 and 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
  • When exposed to humidity, magnets start to rust. For applications outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which secure oxidation as well as corrosion.
  • Due to limitations in producing nuts and complex forms in magnets, we recommend using casing - magnetic holder.
  • Potential hazard related to microscopic parts of magnets can be dangerous, in case of ingestion, which gains importance in the aspect of protecting the youngest. It is also worth noting that small elements of these devices are able to be problematic in diagnostics medical when they are in the body.
  • High unit price – neodymium magnets are more expensive than other types of magnets (e.g. ferrite), which hinders application in large quantities

Highest magnetic holding forcewhat contributes to it?

The specified lifting capacity represents the maximum value, measured under optimal environment, namely:

  • on a block made of structural steel, optimally conducting the magnetic flux
  • with a cross-section no less than 10 mm
  • with an polished contact surface
  • under conditions of ideal adhesion (surface-to-surface)
  • for force acting at a right angle (in the magnet axis)
  • at ambient temperature room level

Key elements affecting lifting force

Please note that the application force may be lower subject to elements below, in order of importance:

  • Clearance – the presence of any layer (rust, dirt, gap) acts as an insulator, which reduces capacity rapidly (even by 50% at 0.5 mm).
  • Force direction – remember that the magnet has greatest strength perpendicularly. Under shear forces, the capacity drops significantly, often to levels of 20-30% of the nominal value.
  • Metal thickness – the thinner the sheet, the weaker the hold. Magnetic flux passes through the material instead of converting into lifting capacity.
  • Material type – the best choice is high-permeability steel. Hardened steels may have worse magnetic properties.
  • Plate texture – ground elements guarantee perfect abutment, which improves force. Uneven metal weaken the grip.
  • Thermal environment – heating the magnet causes a temporary drop of induction. It is worth remembering the maximum operating temperature for a given model.

* Holding force was checked on the plate surface of 20 mm thickness, when a perpendicular force was applied, however under parallel forces the lifting capacity is smaller. Additionally, even a small distance {between} the magnet and the plate reduces the load capacity.

Safe handling of NdFeB magnets

Heat warning

Monitor thermal conditions. Exposing the magnet above 80 degrees Celsius will permanently weaken its magnetic structure and pulling force.

Flammability

Fire hazard: Neodymium dust is highly flammable. Do not process magnets in home conditions as this risks ignition.

Medical implants

Medical warning: Strong magnets can turn off pacemakers and defibrillators. Stay away if you have electronic implants.

Nickel coating and allergies

Some people experience a contact allergy to nickel, which is the common plating for NdFeB magnets. Frequent touching may cause an allergic reaction. We strongly advise wear protective gloves.

Magnetic interference

Navigation devices and mobile phones are extremely sensitive to magnetism. Direct contact with a strong magnet can decalibrate the sensors in your phone.

Material brittleness

Watch out for shards. Magnets can fracture upon violent connection, launching shards into the air. Wear goggles.

Magnetic media

Do not bring magnets close to a wallet, laptop, or TV. The magnetic field can permanently damage these devices and wipe information from cards.

Serious injuries

Risk of injury: The pulling power is so immense that it can cause blood blisters, pinching, and broken bones. Protective gloves are recommended.

Danger to the youngest

Always keep magnets away from children. Choking hazard is significant, and the effects of magnets connecting inside the body are fatal.

Powerful field

Before starting, check safety instructions. Sudden snapping can break the magnet or injure your hand. Think ahead.

Caution!

Details about hazards in the article: Magnet Safety Guide.

Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98