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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
Load capacity 8.00 kg / 78.45 N
Diameter Ø
20 mm [±1 mm]
Height
7.2 mm [±1 mm]
Weight
13.2 g
Magnetization Direction
↑ axial
Coating
[NiCuNi] Nickel
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6.40 zł with VAT / pcs + price for transport

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Product card - 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

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%

Sustainability

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: 370481-2026
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Force (pull)

Magnetic Induction

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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.
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).
Yes, the steel housing (cup) acts as a screen directing the entire magnetic field to one side. This force is available with direct contact with metal.
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 product is intended mainly for use in dry rooms. With constant contact with water or in rain, corrosion may appear on the housing.

Advantages as well as disadvantages of neodymium magnets.

Benefits

Besides their remarkable magnetic power, neodymium magnets offer the following advantages:
  • They retain magnetic properties for nearly ten years – the drop is just ~1% (according to analyses),
  • They maintain their magnetic properties even under close interference source,
  • In other words, due to the metallic layer of gold, the element looks attractive,
  • Magnets have excellent magnetic induction on the outer side,
  • Due to their durability and thermal resistance, neodymium magnets can operate (depending on the form) even at high temperatures reaching 230°C or more...
  • Possibility of accurate creating and adjusting to precise needs,
  • Significant place in electronics industry – they are used in mass storage devices, brushless drives, diagnostic systems, and modern systems.
  • Thanks to their power density, small magnets offer high operating force, occupying minimum space,

Limitations

What to avoid - cons of neodymium magnets and proposals for their use:
  • To avoid cracks under impact, we recommend using special steel housings. Such a solution protects the magnet and simultaneously increases its 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 and shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 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 magnets in rubber or plastics, which secure oxidation and corrosion.
  • We suggest casing - magnetic mechanism, due to difficulties in realizing threads inside the magnet and complex shapes.
  • Health risk to health – tiny shards of magnets pose a threat, in case of ingestion, which is particularly important in the context of child health protection. Furthermore, small elements of these devices can disrupt the diagnostic process medical in case of swallowing.
  • With budget limitations the cost of neodymium magnets is economically unviable,

Pull force analysis

Maximum lifting capacity of the magnet – what it depends on?

The declared magnet strength refers to the peak performance, recorded under ideal test conditions, namely:
  • using a sheet made of mild steel, serving as a magnetic yoke
  • possessing a massiveness of minimum 10 mm to ensure full flux closure
  • characterized by even structure
  • without any insulating layer between the magnet and steel
  • during pulling in a direction perpendicular to the plane
  • at ambient temperature approx. 20 degrees Celsius

Determinants of lifting force in real conditions

Holding efficiency is influenced by specific conditions, mainly (from most important):
  • Clearance – existence of any layer (rust, tape, gap) acts as an insulator, which lowers power rapidly (even by 50% at 0.5 mm).
  • Direction of force – maximum parameter is obtained only during perpendicular pulling. The force required to slide of the magnet along the surface is typically several times lower (approx. 1/5 of the lifting capacity).
  • Wall thickness – thin material does not allow full use of the magnet. Part of the magnetic field penetrates through instead of generating force.
  • Chemical composition of the base – low-carbon steel attracts best. Alloy steels decrease magnetic permeability and lifting capacity.
  • Smoothness – full contact is possible only on smooth steel. Rough texture reduce the real contact area, reducing force.
  • Temperature – temperature increase results in weakening of induction. Check the thermal limit for a given model.

Holding force was measured on the plate surface of 20 mm thickness, when the force acted perpendicularly, in contrast under attempts to slide the magnet the load capacity is reduced by as much as 5 times. In addition, even a slight gap between the magnet and the plate lowers the lifting capacity.

Warnings
Handling guide

Before use, read the rules. Uncontrolled attraction can destroy the magnet or injure your hand. Be predictive.

Protect data

Avoid bringing magnets near a purse, computer, or screen. The magnetic field can destroy these devices and wipe information from cards.

Threat to navigation

An intense magnetic field disrupts the functioning of compasses in smartphones and GPS navigation. Do not bring magnets close to a smartphone to avoid damaging the sensors.

Swallowing risk

Neodymium magnets are not toys. Eating multiple magnets can lead to them pinching intestinal walls, which poses a severe health hazard and requires urgent medical intervention.

Maximum temperature

Watch the temperature. Heating the magnet to high heat will destroy its magnetic structure and strength.

Shattering risk

Watch out for shards. Magnets can explode upon violent connection, launching shards into the air. Wear goggles.

Fire warning

Dust generated during machining of magnets is flammable. Do not drill into magnets unless you are an expert.

Medical interference

Life threat: Strong magnets can deactivate pacemakers and defibrillators. Stay away if you have medical devices.

Pinching danger

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

Allergic reactions

A percentage of the population experience a sensitization to nickel, which is the common plating for NdFeB magnets. Prolonged contact may cause skin redness. It is best to use protective gloves.

Attention! Want to know more? Read our article: Why are neodymium magnets dangerous?