Array ( [0] => Array ( [attr] => Array ( [class] => accordion mb-3 [id] => faq-cat-37 ) [child] => Array ( [0] => Array ( [attr] => Array ( [class] => accordion-item border-0 [itemprop] => mainEntity [itemscope] => [itemtype] => https://schema.org/Question ) [child] => Array ( [0] => Array ( [attr] => Array ( [class] => accordion-header [itemprop] => name ) [child] => Array ( [0] => Array ( [attr] => Array ( [class] => accordion-button shadow-none [data-bs-target] => #collapse-cat-37-0 [data-bs-toggle] => collapse [type] => button ) [child] => Where are through-hole holders used? [type] => button ) ) [type] => div ) [1] => Array ( [attr] => Array ( [class] => accordion-collapse collapse show [data-bs-parent] => #faq-cat-37 [id] => collapse-cat-37-0 [itemprop] => acceptedAnswer [itemscope] => [itemtype] => https://schema.org/Answer ) [child] => Array ( [0] => Array ( [attr] => Array ( [class] => accordion-body [itemprop] => text ) [child] => Array ( [0] => Array ( [attr] => Array ( [class] => row ) [child] => Array ( [0] => Array ( [attr] => Array ( [class] => col-12 ) [child] => This construction allows solid screwing of the magnet to the substrate. Used as door stops, door locks, flap holders, and mounting elements in machines. [type] => div ) ) [type] => div ) ) [type] => div ) ) [type] => div ) ) [type] => div ) [1] => Array ( [attr] => Array ( [class] => accordion-item border-0 [itemprop] => mainEntity [itemscope] => [itemtype] => https://schema.org/Question ) [child] => Array ( [0] => Array ( [attr] => Array ( [class] => accordion-header [itemprop] => name ) [child] => Array ( [0] => Array ( [attr] => Array ( [class] => accordion-button shadow-none [data-bs-target] => #collapse-cat-37-1 [data-bs-toggle] => collapse [type] => button ) [child] => What to watch out for when tightening the magnet? [type] => button ) ) [type] => div ) [1] => Array ( [attr] => Array ( [class] => accordion-collapse collapse [data-bs-parent] => #faq-cat-37 [id] => collapse-cat-37-1 [itemprop] => acceptedAnswer [itemscope] => [itemtype] => https://schema.org/Answer ) [child] => Array ( [0] => Array ( [attr] => Array ( [class] => accordion-body [itemprop] => text ) [child] => Array ( [0] => Array ( [attr] => Array ( [class] => row ) [child] => Array ( [0] => Array ( [attr] => Array ( [class] => col-12 ) [child] => We recommend manual tightening with feeling to avoid crushing the magnetic ring. Proper installation guarantees long holder life without cracks. [type] => div ) ) [type] => div ) ) [type] => div ) ) [type] => div ) ) [type] => div ) [2] => Array ( [attr] => Array ( [class] => accordion-item border-0 [itemprop] => mainEntity [itemscope] => [itemtype] => https://schema.org/Question ) [child] => Array ( [0] => Array ( [attr] => Array ( [class] => accordion-header [itemprop] => name ) [child] => Array ( [0] => Array ( [attr] => Array ( [class] => accordion-button shadow-none [data-bs-target] => #collapse-cat-37-2 [data-bs-toggle] => collapse [type] => button ) [child] => Does the steel housing increase power? [type] => button ) ) [type] => div ) [1] => Array ( [attr] => Array ( [class] => accordion-collapse collapse [data-bs-parent] => #faq-cat-37 [id] => collapse-cat-37-2 [itemprop] => acceptedAnswer [itemscope] => [itemtype] => https://schema.org/Answer ) [child] => Array ( [0] => Array ( [attr] => Array ( [class] => accordion-body [itemprop] => text ) [child] => Array ( [0] => Array ( [attr] => Array ( [class] => row ) [child] => Array ( [0] => Array ( [attr] => Array ( [class] => col-12 ) [child] => Thanks to this, the through-hole holder has a much higher lifting capacity than the magnet itself of these dimensions. Air gap or paint weakens the magnet's action. [type] => div ) ) [type] => div ) ) [type] => div ) ) [type] => div ) ) [type] => div ) [3] => Array ( [attr] => Array ( [class] => accordion-item border-0 [itemprop] => mainEntity [itemscope] => [itemtype] => https://schema.org/Question ) [child] => Array ( [0] => Array ( [attr] => Array ( [class] => accordion-header [itemprop] => name ) [child] => Array ( [0] => Array ( [attr] => Array ( [class] => accordion-button shadow-none [data-bs-target] => #collapse-cat-37-3 [data-bs-toggle] => collapse [type] => button ) [child] => Where are flat screw-on magnets used? [type] => button ) ) [type] => div ) [1] => Array ( [attr] => Array ( [class] => accordion-collapse collapse [data-bs-parent] => #faq-cat-37 [id] => collapse-cat-37-3 [itemprop] => acceptedAnswer [itemscope] => [itemtype] => https://schema.org/Answer ) [child] => Array ( [0] => Array ( [attr] => Array ( [class] => accordion-body [itemprop] => text ) [child] => Array ( [0] => Array ( [attr] => Array ( [class] => row ) [child] => Array ( [0] => Array ( [attr] => Array ( [class] => col-12 ) [child] => They are commonly used in carpentry as strong latches. Great as mounting points in advertising and exhibitions. [type] => div ) ) [type] => div ) ) [type] => div ) ) [type] => div ) ) [type] => div ) [4] => Array ( [attr] => Array ( [class] => accordion-item border-0 [itemprop] => mainEntity [itemscope] => [itemtype] => https://schema.org/Question ) [child] => Array ( [0] => Array ( [attr] => Array ( [class] => accordion-header [itemprop] => name ) [child] => Array ( [0] => Array ( [attr] => Array ( [class] => accordion-button shadow-none [data-bs-target] => #collapse-cat-37-4 [data-bs-toggle] => collapse [type] => button ) [child] => Is the through-hole holder resistant to corrosion? [type] => button ) ) [type] => div ) [1] => Array ( [attr] => Array ( [class] => accordion-collapse collapse [data-bs-parent] => #faq-cat-37 [id] => collapse-cat-37-4 [itemprop] => acceptedAnswer [itemscope] => [itemtype] => https://schema.org/Answer ) [child] => Array ( [0] => Array ( [attr] => Array ( [class] => accordion-body [itemprop] => text ) [child] => Array ( [0] => Array ( [attr] => Array ( [class] => row ) [child] => Array ( [0] => Array ( [attr] => Array ( [class] => col-12 ) [child] => The steel housing and magnet are coated with an anti-corrosion layer (nickel or zinc). For outdoor applications, we recommend additional varnish protection or choosing another magnet version. [type] => div ) ) [type] => div ) ) [type] => div ) ) [type] => div ) ) [type] => div ) ) [type] => div ) ) HH 20x7.2 [M4] / N38 - through-hole holder for screw

e-mail: bok@dhit.pl

neodymium magnets

We provide red color magnets Nd2Fe14B - our offer. Practically all magnesy neodymowe in our store are available for immediate delivery (check the list). See the magnet price list for more details check the magnet price list

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Product available shipping tomorrow

HH 20x7.2 [M4] / N38 - through hole magnetic holder

through hole magnetic holder

Catalog no 370481

GTIN: 5906301814917

5

Diameter Ø [±0,1 mm]

20 mm

Height [±0,1 mm]

7.2 mm

Weight

13.2 g

Magnetization Direction

↑ axial

Load capacity

8 kg / 78.45 N

Coating

[NiCuNi] nickel

6.40 with VAT / pcs + price for transport

5.20 ZŁ net + 23% VAT / pcs

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HH 20x7.2 [M4] / N38 - through hole magnetic holder

Specification/characteristics HH 20x7.2 [M4] / N38 - through hole magnetic holder
properties
values
Cat. no.
370481
GTIN
5906301814917
Production/Distribution
Dhit sp. z o.o.
Country of origin
Poland / China / Germany
Customs code
85059029
Diameter Ø
20 mm [±0,1 mm]
Height
7.2 mm [±0,1 mm]
Weight
13.2 g [±0,1 mm]
Magnetization Direction
↑ axial
Load capacity ~ ?
8 kg / 78.45 N
Coating
[NiCuNi] nickel
Manufacturing Tolerance
± 0.1 mm

Magnetic properties of material N38

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 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

This construction allows solid screwing of the magnet to the substrate. The steel housing strengthens the attraction force and protects the magnet from cracking.
The magnet inside is brittle, so we advise against using impact drivers. Select a screw with the appropriate diameter and head shape (cylindrical or countersunk, depending on the model).
Yes, the steel housing (cup) acts as a screen directing the entire magnetic field to one side. It is a very efficient solution with a small thickness.
These holders are ideal for mounting on non-magnetic surfaces, such as wood, furniture board, or wall. They can be used to build jigs in the workshop.
Protection protects against moisture in indoor conditions. For outdoor applications, we recommend additional varnish protection or choosing another magnet version.

Advantages and disadvantages of neodymium magnets NdFeB.

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

  • They retain their magnetic properties for nearly 10 years – the drop is just ~1% (according to analyses),
  • Their ability to resist magnetic interference from external fields is impressive,
  • By applying a bright layer of nickel, the element gains a sleek look,
  • Magnetic induction on the surface of these magnets is impressively powerful,
  • Thanks to their enhanced temperature resistance, they can operate (depending on the geometry) even at temperatures up to 230°C or more,
  • Thanks to the flexibility in shaping and the capability to adapt to individual requirements, neodymium magnets can be created in diverse shapes and sizes, which expands their application range,
  • Important function in cutting-edge sectors – they are utilized in HDDs, electromechanical systems, medical equipment and technologically developed systems,
  • Compactness – despite their small size, they generate strong force, making them ideal for precision applications

Disadvantages of magnetic elements:

  • They are prone to breaking when subjected to a strong impact. If the magnets are exposed to external force, it is suggested to place them in a protective case. The steel housing, in the form of a holder, protects the magnet from fracture while also reinforces its overall strength,
  • They lose strength at extreme temperatures. Most neodymium magnets experience permanent decline in strength when heated above 80°C (depending on the shape and height). However, we offer special variants with high temperature resistance that can operate up to 230°C or higher,
  • They rust in a humid environment – during outdoor use, we recommend using waterproof magnets, such as those made of non-metallic materials,
  • Using a cover – such as a magnetic holder – is advised due to the difficulty in manufacturing complex structures directly in the magnet,
  • Potential hazard from tiny pieces may arise, in case of ingestion, which is important in the health of young users. Moreover, small elements from these devices might disrupt scanning if inside the body,
  • In cases of large-volume purchasing, neodymium magnet cost may be a barrier,

Best holding force of the magnet in ideal parameterswhat it depends on?

The given holding capacity of the magnet corresponds to the highest holding force, calculated in the best circumstances, namely:

  • using a steel plate with low carbon content, serving as a magnetic circuit closure
  • with a thickness of minimum 10 mm
  • with a polished side
  • with no separation
  • in a perpendicular direction of force
  • at room temperature

Key elements affecting lifting force

In practice, the holding capacity of a magnet is affected by these factors, arranged from the most important to the least relevant:

  • Air gap between the magnet and the plate, since even a very small distance (e.g. 0.5 mm) causes a drop in lifting force of up to 50%.
  • Direction of applied force, because the maximum lifting capacity is achieved under perpendicular application. The force required to slide the magnet along the plate is usually several times lower.
  • Thickness of the plate, as a plate that is too thin causes part of the magnetic flux not to be used and to remain wasted in the air.
  • Material of the plate, because higher carbon content lowers holding force, while higher iron content increases it. The best choice is steel with high magnetic permeability and high saturation induction.
  • Surface of the plate, because the more smooth and polished it is, the better the contact and consequently the greater the magnetic saturation.
  • Operating temperature, since all permanent magnets have a negative temperature coefficient. This means that at high temperatures they are weaker, while at sub-zero temperatures they become slightly stronger.

* Holding force was checked on the plate surface of 20 mm thickness, when the force acted perpendicularly, whereas under attempts to slide the magnet the holding force is lower. Moreover, even a slight gap {between} the magnet’s surface and the plate reduces the lifting capacity.

Handle Neodymium Magnets Carefully

Do not place neodymium magnets near a computer HDD, TV, and wallet.

Magnetic fields generated by neodymium magnets can damage magnetic storage media such as floppy disks, credit cards, magnetic ID cards, cassette tapes, video tapes, or other similar devices. In addition, they can damage televisions, VCRs, computer monitors, and CRT displays. You should especially avoid placing neodymium magnets near electronic devices.

Neodymium magnets can become demagnetized at high temperatures.

Despite the fact that magnets have been found to maintain their efficacy up to temperatures of 80°C or 175°F, it's essential to consider that this threshold may fluctuate depending on the magnet's type, configuration, and intended usage.

Keep neodymium magnets away from GPS and smartphones.

Neodymium magnets produce strong magnetic fields that interfere with magnetometers and compasses used in navigation, as well as internal compasses of smartphones and GPS devices.

Neodymium magnetic are incredibly delicate, they easily crack as well as can crumble.

Magnets made of neodymium are extremely fragile, and by joining them in an uncontrolled manner, they will crumble. Neodymium magnets are made of metal and coated with a shiny nickel surface, but they are not as hard as steel. In the event of a collision between two magnets, there may be a scattering of fragments in different directions. Protecting your eyes is crucial in such a situation.

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

Familiarize yourself with our information to properly handle these magnets and avoid significant swellings to your body and prevent damage to the magnets.

Dust and powder from neodymium magnets are flammable.

Do not attempt to drill into neodymium magnets. Mechanical processing is also not recommended. Once crushed into fine powder or dust, this material becomes highly flammable.

  Neodymium magnets should not be around children.

Neodymium magnets are not toys. Do not allow children to play with them. Small magnets can pose a serious choking hazard. If multiple magnets are swallowed, they can attract to each other through the intestinal walls, causing severe injuries, and even death.

Neodymium magnets are primarily characterized by their significant internal force. They attract to each other, and any object that comes in their way will be affected.

Neodymium magnets jump and touch each other mutually within a distance of several to around 10 cm from each other.

People with pacemakers are advised to avoid neodymium magnets.

Neodymium magnets generate strong magnetic fields. As a result, they interfere with the operation of a pacemaker. This is because many of these devices are equipped with a function that deactivates the device in a magnetic field.

The magnet coating is made of nickel, so be cautious if you have an allergy.

Studies show a small percentage of people have allergies to certain metals, including 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.

Be careful!

To raise awareness of why neodymium magnets are so dangerous, see the article titled How dangerous are strong neodymium magnets?.

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e-mail: bok@dhit.pl

tel: +48 888 99 98 98