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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

11.44 with VAT / pcs + price for transport

9.30 ZŁ net + 23% VAT / pcs

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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
Technical specification and ecology
Chemical composition
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%
Ecology and recycling (GPSR)
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: 370482-2025
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Pulling force

Field Strength

Other proposals

A through-hole holder is a flat neodymium magnet placed in a steel cup with a mounting hole. 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. It is worth using a washer if the screw head is small to distribute pressure.
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.
This protection shields against moisture in indoor conditions but is not 100% waterproof. For outdoor applications, we recommend additional protection with varnish or choosing a rubberized version.

Pros as well as cons of rare earth magnets.

Advantages
Besides their exceptional strength, neodymium magnets offer the following advantages:
  • They do not lose power, even after nearly 10 years – the drop in strength is only ~1% (based on measurements),
  • They maintain their magnetic properties even under strong external field,
  • By applying a reflective layer of silver, the element presents an aesthetic look,
  • Neodymium magnets generate maximum magnetic induction on a small surface, which increases force concentration,
  • Through (adequate) combination of ingredients, they can achieve high thermal resistance, allowing for functioning at temperatures reaching 230°C and above...
  • Thanks to freedom in designing and the capacity to customize to client solutions,
  • Fundamental importance in high-tech industry – they are utilized in hard drives, motor assemblies, precision medical tools, also modern systems.
  • Thanks to concentrated force, small magnets offer high operating force, with minimal size,
Limitations
What to avoid - cons of neodymium magnets: application proposals
  • To avoid cracks under impact, we suggest using special steel holders. Such a solution secures the magnet and simultaneously increases its durability.
  • We warn that neodymium magnets can lose their power at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 230°C.
  • Magnets exposed to a humid environment can corrode. Therefore during using outdoors, we recommend using water-impermeable magnets made of rubber, plastic or other material resistant to moisture
  • We recommend cover - magnetic mechanism, due to difficulties in producing nuts inside the magnet and complex shapes.
  • Possible danger resulting from small fragments of magnets are risky, if swallowed, which becomes key in the context of child safety. It is also worth noting that tiny parts of these magnets can complicate diagnosis medical after entering the body.
  • High unit price – neodymium magnets have a higher price than other types of magnets (e.g. ferrite), which increases costs of application in large quantities

Lifting parameters

Detachment force of the magnet in optimal conditionswhat it depends on?
The declared magnet strength represents the limit force, obtained under ideal test conditions, namely:
  • with the contact of a sheet made of special test steel, guaranteeing full magnetic saturation
  • with a thickness of at least 10 mm
  • with an ideally smooth touching surface
  • under conditions of ideal adhesion (surface-to-surface)
  • under vertical application of breakaway force (90-degree angle)
  • in neutral thermal conditions
Impact of factors on magnetic holding capacity in practice
In real-world applications, the actual lifting capacity is determined by several key aspects, presented from crucial:
  • 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.
  • Load vector – maximum parameter is reached only during pulling at a 90° angle. The shear force of the magnet along the surface is standardly several times lower (approx. 1/5 of the lifting capacity).
  • Wall thickness – the thinner the sheet, the weaker the hold. Magnetic flux passes through the material instead of converting into lifting capacity.
  • Metal type – different alloys attracts identically. High carbon content weaken the interaction with the magnet.
  • Smoothness – full contact is possible only on polished steel. Any scratches and bumps reduce the real contact area, weakening the magnet.
  • Thermal environment – temperature increase results in weakening of force. Check the maximum operating temperature for a given model.

Lifting capacity testing was conducted on plates with a smooth surface of optimal thickness, under perpendicular forces, in contrast under attempts to slide the magnet the lifting capacity is smaller. In addition, even a small distance between the magnet and the plate lowers the holding force.

Warnings
Pacemakers

For implant holders: Strong magnetic fields disrupt medical devices. Maintain at least 30 cm distance or request help to work with the magnets.

Fire warning

Machining of neodymium magnets poses a fire hazard. Neodymium dust reacts violently with oxygen and is hard to extinguish.

Cards and drives

Powerful magnetic fields can erase data on payment cards, HDDs, and other magnetic media. Maintain a gap of min. 10 cm.

Finger safety

Mind your fingers. Two large magnets will snap together immediately with a force of massive weight, destroying everything in their path. Exercise extreme caution!

Nickel coating and allergies

Medical facts indicate that nickel (the usual finish) is a potent allergen. For allergy sufferers, refrain from touching magnets with bare hands and opt for versions in plastic housing.

Operating temperature

Standard neodymium magnets (N-type) lose magnetization when the temperature surpasses 80°C. This process is irreversible.

Danger to the youngest

Adult use only. Small elements can be swallowed, causing serious injuries. Keep away from children and animals.

Protective goggles

Despite the nickel coating, the material is brittle and not impact-resistant. Avoid impacts, as the magnet may crumble into sharp, dangerous pieces.

Magnetic interference

Navigation devices and smartphones are highly sensitive to magnetism. Direct contact with a strong magnet can ruin the sensors in your phone.

Do not underestimate power

Before use, check safety instructions. Sudden snapping can destroy the magnet or hurt your hand. Be predictive.

Attention! Learn more about risks in the article: Safety of working with magnets.
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98