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

through hole magnetic holder

Catalog no 370481

GTIN/EAN: 5906301814917

5.00

Diameter Ø

20 mm [±1 mm]

Height

7.2 mm [±1 mm]

Weight

13.2 g

Magnetization Direction

↑ axial

Load capacity

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

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

properties
properties values
Cat. no. 370481
GTIN/EAN 5906301814917
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 20 mm [±1 mm]
Height 7.2 mm [±1 mm]
Weight 13.2 g
Magnetization Direction ↑ axial
Load capacity ~ ? 8.00 kg / 78.45 N
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±1 mm

Magnetic properties of material N38

Specification / characteristics HH 20x7.2 [M4] / 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
Elemental analysis
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: 370481-2025
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Pulling force

Magnetic Induction

See also products

This construction allows solid screwing of the magnet to the substrate using a bolt or rivet. 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. Select a screw of appropriate diameter and head shape (cylindrical or conical, depending on model).
Model HH 20x7.2 [M4] / N38 has a holding force of approx. 8.00 kg on thick steel. Air gap, rust, or paint weaken the magnet's action.
They are commonly used in carpentry as strong furniture latches. Great as mounting points in advertising and exhibition.
The product is intended mainly for use in dry rooms. For outdoor applications, we recommend additional protection with varnish or choosing a rubberized version.

Advantages as well as disadvantages of neodymium magnets.

Benefits

Besides their tremendous strength, neodymium magnets offer the following advantages:
  • They have constant strength, and over nearly 10 years their performance decreases symbolically – ~1% (according to theory),
  • They are noted for resistance to demagnetization induced by external magnetic fields,
  • By applying a decorative layer of silver, the element has an modern look,
  • They are known for high magnetic induction at the operating surface, which increases their power,
  • Neodymium magnets are characterized by very high magnetic induction on the magnet surface and are able to act (depending on the form) even at a temperature of 230°C or more...
  • Thanks to freedom in forming and the ability to modify to specific needs,
  • Universal use in electronics industry – they are used in mass storage devices, electromotive mechanisms, advanced medical instruments, as well as multitasking production systems.
  • Thanks to concentrated force, small magnets offer high operating force, occupying minimum space,

Limitations

Disadvantages of NdFeB magnets:
  • At strong impacts they can crack, therefore we recommend placing them in steel cases. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
  • When exposed to high temperature, neodymium magnets suffer a drop in power. Often, when the temperature exceeds 80°C, their strength decreases (depending on the size, as well as shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
  • They oxidize in a humid environment. For use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
  • We suggest a housing - magnetic holder, due to difficulties in creating threads inside the magnet and complex shapes.
  • Health risk to health – tiny shards of magnets are risky, if swallowed, which is particularly important in the context of child health protection. Additionally, small elements of these devices are able to disrupt the diagnostic process medical when they are in the body.
  • Due to complex production process, their price exceeds standard values,

Holding force characteristics

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

The declared magnet strength concerns the peak performance, obtained under optimal environment, namely:
  • on a plate made of structural steel, perfectly concentrating the magnetic field
  • possessing a thickness of min. 10 mm to ensure full flux closure
  • characterized by even structure
  • without the slightest insulating layer between the magnet and steel
  • during detachment in a direction perpendicular to the mounting surface
  • in temp. approx. 20°C

Practical lifting capacity: influencing factors

Holding efficiency is affected by working environment parameters, including (from priority):
  • Gap between surfaces – even a fraction of a millimeter of distance (caused e.g. by veneer or unevenness) diminishes the magnet efficiency, often by half at just 0.5 mm.
  • Pull-off angle – remember that the magnet holds strongest perpendicularly. Under shear forces, the capacity drops significantly, often to levels of 20-30% of the nominal value.
  • Plate thickness – too thin sheet causes magnetic saturation, causing part of the power to be wasted to the other side.
  • Steel grade – the best choice is high-permeability steel. Stainless steels may attract less.
  • Surface structure – the more even the plate, the larger the contact zone and stronger the hold. Roughness acts like micro-gaps.
  • Temperature – temperature increase results in weakening of induction. Check the maximum operating temperature for a given model.

Holding force was tested on the plate surface of 20 mm thickness, when the force acted perpendicularly, in contrast under attempts to slide the magnet the holding force is lower. Additionally, even a small distance between the magnet and the plate reduces the holding force.

Safety rules for work with NdFeB magnets
GPS and phone interference

Navigation devices and smartphones are highly susceptible to magnetism. Close proximity with a strong magnet can decalibrate the internal compass in your phone.

Caution required

Handle with care. Rare earth magnets attract from a distance and connect with huge force, often faster than you can react.

Keep away from children

Adult use only. Tiny parts pose a choking risk, causing serious injuries. Store away from kids and pets.

Data carriers

Device Safety: Strong magnets can ruin payment cards and delicate electronics (heart implants, hearing aids, timepieces).

Health Danger

Life threat: Strong magnets can turn off heart devices and defibrillators. Stay away if you have medical devices.

Permanent damage

Keep cool. Neodymium magnets are sensitive to temperature. If you need operation above 80°C, look for HT versions (H, SH, UH).

Warning for allergy sufferers

It is widely known that the nickel plating (the usual finish) is a common allergen. If you have an allergy, prevent direct skin contact or select coated magnets.

Fire risk

Powder created during grinding of magnets is self-igniting. Do not drill into magnets without proper cooling and knowledge.

Protective goggles

Despite metallic appearance, the material is brittle and not impact-resistant. Do not hit, as the magnet may shatter into sharp, dangerous pieces.

Pinching danger

Risk of injury: The attraction force is so great that it can cause hematomas, pinching, and broken bones. Use thick gloves.

Caution! Details 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