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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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Lifting power and structure of neodymium magnets can be tested with our magnetic mass calculator.

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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
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: 370481-2025
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Pulling force

Field Strength

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This construction allows solid screwing of the magnet to the substrate using a bolt or rivet. They are used as bumpers, door stops, flap holders, and mounting elements in machines.
Similarly to other neodymium magnets, caution should be exercised when tightening the screw. 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 serve as a base for holding metal elements, e.g., doors, flaps, covers, or tools. Great as mounting points in advertising and exhibition.
The steel housing and magnet are covered with an anti-corrosion layer (nickel, zinc, or chrome). This is not a stainless product (unless stated otherwise).

Pros and cons of rare earth magnets.

Benefits

In addition to their magnetic efficiency, neodymium magnets provide the following advantages:
  • They virtually do not lose strength, because even after ten years the decline in efficiency is only ~1% (in laboratory conditions),
  • Magnets very well defend themselves against demagnetization caused by external fields,
  • A magnet with a smooth silver surface has an effective appearance,
  • The surface of neodymium magnets generates a maximum magnetic field – this is one of their assets,
  • Through (appropriate) combination of ingredients, they can achieve high thermal strength, enabling operation at temperatures reaching 230°C and above...
  • Possibility of custom shaping and modifying to precise requirements,
  • Huge importance in modern technologies – they find application in data components, electric motors, medical equipment, as well as complex engineering applications.
  • Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in compact dimensions, which allows their use in compact constructions

Weaknesses

Disadvantages of NdFeB magnets:
  • To avoid cracks upon strong impacts, we suggest using special steel holders. Such a solution protects the magnet and simultaneously increases its durability.
  • We warn that neodymium magnets can reduce their power at high temperatures. To prevent this, we suggest our specialized [AH] magnets, which work effectively even at 230°C.
  • When exposed to humidity, magnets start to rust. To use them in conditions outside, it is recommended to use protective magnets, such as those in rubber or plastics, which secure oxidation and corrosion.
  • Due to limitations in producing threads and complicated forms in magnets, we recommend using cover - magnetic mount.
  • Potential hazard related to microscopic parts of magnets are risky, when accidentally swallowed, which gains importance in the context of child safety. It is also worth noting that small elements of these devices are able to complicate diagnosis 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

Highest magnetic holding forcewhat contributes to it?

The force parameter is a theoretical maximum value executed under the following configuration:
  • with the use of a sheet made of low-carbon steel, guaranteeing full magnetic saturation
  • with a cross-section no less than 10 mm
  • with an ground contact surface
  • with total lack of distance (without impurities)
  • for force acting at a right angle (in the magnet axis)
  • in stable room temperature

Determinants of lifting force in real conditions

Bear in mind that the working load will differ subject to the following factors, in order of importance:
  • Air gap (between the magnet and the plate), because even a microscopic distance (e.g. 0.5 mm) results in a drastic drop in force by up to 50% (this also applies to varnish, rust or dirt).
  • Direction of force – maximum parameter is obtained only during perpendicular pulling. The shear force of the magnet along the surface is usually many times lower (approx. 1/5 of the lifting capacity).
  • Plate thickness – insufficiently thick plate causes magnetic saturation, causing part of the power to be lost to the other side.
  • Plate material – low-carbon steel attracts best. Higher carbon content reduce magnetic properties and holding force.
  • Surface finish – ideal contact is possible only on polished steel. Any scratches and bumps create air cushions, weakening the magnet.
  • Thermal factor – high temperature weakens magnetic field. Exceeding the limit temperature can permanently demagnetize the magnet.

Lifting capacity testing was carried out on plates with a smooth surface of suitable thickness, under a perpendicular pulling force, however under shearing force the load capacity is reduced by as much as fivefold. In addition, even a minimal clearance between the magnet and the plate decreases the lifting capacity.

Safe handling of neodymium magnets
Safe distance

Data protection: Strong magnets can damage data carriers and delicate electronics (heart implants, medical aids, timepieces).

Magnet fragility

Despite the nickel coating, neodymium is delicate and cannot withstand shocks. Do not hit, as the magnet may shatter into hazardous fragments.

Health Danger

Health Alert: Neodymium magnets can deactivate pacemakers and defibrillators. Stay away if you have medical devices.

Magnetic interference

A strong magnetic field disrupts the operation of magnetometers in smartphones and GPS navigation. Maintain magnets close to a smartphone to avoid breaking the sensors.

Sensitization to coating

Studies show that nickel (standard magnet coating) is a strong allergen. If your skin reacts to metals, avoid touching magnets with bare hands or opt for encased magnets.

Dust is flammable

Mechanical processing of neodymium magnets carries a risk of fire risk. Magnetic powder oxidizes rapidly with oxygen and is hard to extinguish.

No play value

Only for adults. Small elements pose a choking risk, leading to serious injuries. Keep away from children and animals.

Thermal limits

Do not overheat. Neodymium magnets are susceptible to temperature. If you require resistance above 80°C, ask us about special high-temperature series (H, SH, UH).

Safe operation

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

Pinching danger

Big blocks can crush fingers instantly. Never put your hand between two attracting surfaces.

Danger! More info 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