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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
Load capacity 17.00 kg / 166.71 N
Diameter Ø
25 mm [±1 mm]
Height
7.7 mm [±1 mm]
Weight
23.8 g
Magnetization Direction
↑ axial
Coating
[NiCuNi] Nickel

How we measure these parameters — certificates and measurements

technical details »

9.30 zł net / pcs

11.44 zł with VAT (23% VAT) / pcs

price for transport

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price from 100 pcs
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Frequently asked questions

How much will a magnetic holder hold in practice?
The catalogue value assumes full contact with smooth steel at least 10 mm thick and a perpendicular pull. Thinner sheet, paint, rust and surface irregularities reduce it considerably: on 1 mm sheet about half remains. Lifting and vertical mounting call for an additional safety margin.
Will a holder work on stainless steel?
Not on austenitic grades 304 and 316 — they are effectively non-magnetic. It will not work on aluminium, copper or brass either. Those materials need a mechanical gripper.
Which coating for which conditions?
Nickel-copper-nickel (NiCuNi) is the standard and covers most applications. Epoxy is used for damp environments and outdoor work, zinc is sufficient for dry interiors. Holders in a steel housing or in rubber also protect the magnet against impact.

Guides from the knowledge base

Want to talk magnets?

Call us now +48 888 99 98 98 alternatively let us know using contact form the contact section.
Specifications and structure of a neodymium magnet can be estimated using our power calculator.

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Technical specification of the product - 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 310 °C
Curie Temperature TF 590 °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%

Environmental data

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
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A through-hole holder is a flat neodymium magnet placed in a steel cup with a mounting hole. It is a more durable and stronger solution than a bare magnetic ring.
We recommend manual tightening with feeling to not crush the magnetic ring. Correct mounting guarantees long holder life without cracks.
Model HH 25x7.7 [M5] / N38 has a holding force of approx. 17.00 kg on thick steel. It is a very efficient solution of small thickness, ensuring high power.
They are commonly used in carpentry as strong furniture latches. Great as mounting points in advertising and exhibition.
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 as well as disadvantages of neodymium magnets.

Pros

In addition to their long-term stability, neodymium magnets provide the following advantages:
  • They virtually do not lose power, because even after 10 years the performance loss is only ~1% (according to literature),
  • Neodymium magnets prove to be extremely resistant to demagnetization caused by external magnetic fields,
  • By applying a reflective layer of silver, the element gains an nice look,
  • Magnets have extremely high magnetic induction on the surface,
  • Thanks to resistance to high temperature, they are capable of working (depending on the shape) even at temperatures up to 230°C and higher...
  • Thanks to freedom in constructing and the ability to adapt to unusual requirements,
  • Huge importance in advanced technology sectors – they serve a role in computer drives, electric drive systems, medical equipment, as well as multitasking production systems.
  • Compactness – despite small sizes they generate large force, making them ideal for precision applications

Disadvantages

Disadvantages of NdFeB magnets:
  • At very strong impacts they can break, therefore we recommend placing them in special holders. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
  • Neodymium magnets lose power when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop 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 very 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 prevent oxidation and corrosion.
  • We suggest a housing - magnetic mount, due to difficulties in creating nuts inside the magnet and complex forms.
  • Health risk related to microscopic parts of magnets can be dangerous, when accidentally swallowed, which gains importance in the context of child safety. It is also worth noting that small elements of these magnets are able to disrupt the diagnostic process medical when they are in the body.
  • Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Holding force characteristics

Maximum magnetic pulling force – what contributes to it?

The declared magnet strength represents the maximum value, recorded under optimal environment, specifically:
  • on a block made of mild steel, optimally conducting the magnetic flux
  • whose transverse dimension is min. 10 mm
  • with a surface free of scratches
  • without the slightest air gap between the magnet and steel
  • under vertical force direction (90-degree angle)
  • at conditions approx. 20°C

Determinants of lifting force in real conditions

It is worth knowing that the application force may be lower depending on elements below, starting with the most relevant:
  • Space between magnet and steel – every millimeter of separation (caused e.g. by varnish or dirt) drastically reduces the pulling force, often by half at just 0.5 mm.
  • Load vector – maximum parameter is available only during pulling at a 90° angle. The resistance to sliding of the magnet along the surface is usually many times lower (approx. 1/5 of the lifting capacity).
  • Plate thickness – too thin sheet causes magnetic saturation, causing part of the power to be escaped to the other side.
  • Steel type – low-carbon steel gives the best results. Alloy admixtures lower magnetic permeability and holding force.
  • Plate texture – smooth surfaces ensure maximum contact, which improves force. Rough surfaces reduce efficiency.
  • Temperature influence – hot environment weakens pulling force. Too high temperature can permanently demagnetize the magnet.

Lifting capacity was measured by applying a steel plate with a smooth surface of suitable thickness (min. 20 mm), under perpendicular detachment force, in contrast under parallel forces the holding force is lower. Additionally, even a small distance between the magnet’s surface and the plate lowers the lifting capacity.

H&S for magnets
Allergic reactions

Medical facts indicate that the nickel plating (standard magnet coating) is a common allergen. If you have an allergy, avoid direct skin contact or opt for encased magnets.

Danger to pacemakers

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

Magnetic interference

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

Threat to electronics

Device Safety: Neodymium magnets can damage payment cards and sensitive devices (pacemakers, medical aids, mechanical watches).

Product not for children

Only for adults. Small elements pose a choking risk, causing severe trauma. Store out of reach of children and animals.

Maximum temperature

Do not overheat. Neodymium magnets are sensitive to temperature. If you need resistance above 80°C, ask us about HT versions (H, SH, UH).

Fire warning

Fire warning: Rare earth powder is explosive. Do not process magnets without safety gear as this risks ignition.

Physical harm

Big blocks can crush fingers instantly. Under no circumstances place your hand betwixt two attracting surfaces.

Shattering risk

Neodymium magnets are sintered ceramics, meaning they are fragile like glass. Collision of two magnets leads to them shattering into small pieces.

Do not underestimate power

Be careful. Neodymium magnets act from a distance and snap with huge force, often faster than you can react.

Important! Learn more about risks in the article: Safety of working with magnets.