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

through hole magnetic holder

Catalog no 370482

GTIN/EAN: 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

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11.44 ZŁ with VAT / pcs + price for transport

9.30 ZŁ net + 23% VAT / pcs

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Detailed specification - 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/EAN 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 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
Engineering data and GPSR
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: 370482-2026
Quick Unit Converter
Force (pull)
Field Strength
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This construction allows solid screwing of the magnet to the substrate using a bolt or rivet. The steel housing strengthens attraction force and protects the magnet from cracking.
We recommend manual tightening with feeling to not crush the magnetic ring. 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. It is a very efficient solution of small thickness, ensuring high power.
They are commonly used in carpentry as strong furniture latches. Can be used to build jigs in the workshop or mount lighting.
The steel housing and magnet are covered with an anti-corrosion layer (nickel, zinc, or chrome). For outdoor applications, we recommend additional protection with varnish or choosing a rubberized version.

Advantages and disadvantages of rare earth magnets.

Pros

Besides their magnetic performance, neodymium magnets are valued for these benefits:
  • They do not lose strength, even during around 10 years – the drop in lifting capacity is only ~1% (based on measurements),
  • Neodymium magnets are remarkably resistant to demagnetization caused by external field sources,
  • A magnet with a shiny nickel surface is more attractive,
  • Magnets possess impressive magnetic induction on the surface,
  • Thanks to resistance to high temperature, they can operate (depending on the shape) even at temperatures up to 230°C and higher...
  • Thanks to the option of free forming and adaptation to unique projects, neodymium magnets can be created in a broad palette of shapes and sizes, which increases their versatility,
  • Universal use in high-tech industry – they are used in data components, motor assemblies, medical devices, also complex engineering applications.
  • Relatively small size with high pulling force – neodymium magnets offer high power in small dimensions, which allows their use in miniature devices

Cons

Disadvantages of neodymium magnets:
  • To avoid cracks under impact, we suggest using special steel housings. Such a solution protects the magnet and simultaneously increases its durability.
  • When exposed to high temperature, neodymium magnets experience a drop in strength. Often, when the temperature exceeds 80°C, their strength decreases (depending on the size and shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
  • When exposed to humidity, magnets usually rust. To use them in conditions outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which prevent oxidation and corrosion.
  • We suggest cover - magnetic mount, due to difficulties in realizing threads inside the magnet and complex shapes.
  • Health risk to health – tiny shards of magnets can be dangerous, if swallowed, which becomes key in the context of child health protection. It is also worth noting that small elements of these magnets are able to be problematic in diagnostics medical in case of swallowing.
  • Due to expensive raw materials, their price is higher than average,

Holding force characteristics

Maximum lifting force for a neodymium magnet – what it depends on?

Holding force of 17.00 kg is a theoretical maximum value executed under standard conditions:
  • with the application of a yoke made of special test steel, ensuring maximum field concentration
  • possessing a massiveness of min. 10 mm to avoid saturation
  • characterized by smoothness
  • without the slightest insulating layer between the magnet and steel
  • during pulling in a direction perpendicular to the plane
  • at room temperature

Determinants of practical lifting force of a magnet

Real force is affected by specific conditions, such as (from most important):
  • Clearance – the presence of any layer (paint, tape, gap) acts as an insulator, which lowers power steeply (even by 50% at 0.5 mm).
  • Loading method – catalog parameter refers to pulling vertically. When attempting to slide, the magnet exhibits much less (often approx. 20-30% of maximum force).
  • Wall thickness – the thinner the sheet, the weaker the hold. Magnetic flux passes through the material instead of generating force.
  • Plate material – low-carbon steel attracts best. Alloy steels decrease magnetic properties and holding force.
  • Surface structure – the smoother and more polished the plate, the larger the contact zone and stronger the hold. Unevenness creates an air distance.
  • Thermal environment – temperature increase causes a temporary drop of induction. Check the maximum operating temperature for a given model.

Holding force was tested on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, however under parallel forces the holding force is lower. In addition, even a slight gap between the magnet’s surface and the plate reduces the lifting capacity.

H&S for magnets
Medical interference

Health Alert: Strong magnets can turn off heart devices and defibrillators. Do not approach if you have electronic implants.

Crushing risk

Risk of injury: The attraction force is so immense that it can cause hematomas, crushing, and broken bones. Protective gloves are recommended.

No play value

Product intended for adults. Tiny parts pose a choking risk, leading to serious injuries. Keep away from kids and pets.

Material brittleness

Beware of splinters. Magnets can fracture upon uncontrolled impact, ejecting shards into the air. Wear goggles.

Respect the power

Handle with care. Neodymium magnets act from a distance and connect with huge force, often faster than you can react.

Allergy Warning

Studies show that the nickel plating (the usual finish) is a potent allergen. For allergy sufferers, refrain from direct skin contact or choose coated magnets.

Machining danger

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

Thermal limits

Control the heat. Exposing the magnet above 80 degrees Celsius will ruin its magnetic structure and strength.

Cards and drives

Device Safety: Strong magnets can ruin data carriers and sensitive devices (pacemakers, hearing aids, mechanical watches).

Impact on smartphones

A powerful magnetic field disrupts the functioning of magnetometers in phones and GPS navigation. Do not bring magnets close to a smartphone to prevent damaging the sensors.

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