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neodymium magnets

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MP 30x6x10 / N38 - ring magnet

ring magnet

Catalog no 030197

GTIN: 5906301812142

5

Diameter [±0,1 mm]

30 mm

internal diameter Ø [±0,1 mm]

6 mm

Height [±0,1 mm]

10 mm

Weight

56.55 g

Magnetization Direction

↑ axial

Load capacity

3.42 kg / 33.54 N

Magnetic Induction

248.80 mT

Coating

[NiCuNi] nickel

16.00 with VAT / pcs + price for transport

13.01 ZŁ net + 23% VAT / pcs

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MP 30x6x10 / N38 - ring magnet
Specification/characteristics MP 30x6x10 / N38 - ring magnet
properties
values
Cat. no.
030197
GTIN
5906301812142
Production/Distribution
Dhit sp. z o.o.
Country of origin
Poland / China / Germany
Customs code
85059029
Diameter
30 mm [±0,1 mm]
internal diameter Ø
6 mm [±0,1 mm]
Height
10 mm [±0,1 mm]
Weight
56.55 g [±0,1 mm]
Magnetization Direction
↑ axial
Load capacity ~ ?
3.42 kg / 33.54 N
Magnetic Induction ~ ?
248.80 mT
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 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 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

The ring magnet with a hole is created for screwing in. The presence of a hole (often for a countersunk screw) allows for quick installation of the magnet to wood, walls, or plastic. Product MP 30x6x10 / N38 with a force of 3.42 kg works great as a door catch, tool holder, or box closure. The ring form permits sliding it onto a rod or shaft.
This is a crucial issue. Neodymium magnets are extremely brittle. During installation, tighten with moderation. Use a hand screwdriver, not impact drivers, because excessive pressure can shatter the ring. We suggest to use a washer to absorb stress. Note: cracking during installation results from the material properties, but an installation error.
Most countersunk magnets have poles on flat faces. To make two magnets attract, you need a pair where one magnet has the **N** pole on the countersunk side and the other has the **S** pole. With identical magnets, they might not fit on the mounting sides. In our offer, we try to mark matching pairs, or you can use one magnet and a steel washer as the second element.
Ring magnets come in two versions: with a straight hole and with a countersunk hole (chamfered). The screw version allows the screw head to be hidden with the surface, which is key in furniture making. A ring without chamfer is better for sliding onto rods or separators. The model you are viewing is the version MP 30x6x10 / N38 - check the hole type in the title or photo.
These magnets are coated with a standard anti-corrosion Ni-Cu-Ni coating. It secures the neodymium in indoor conditions, but does not ensure full waterproofing. Around the hole, the coating is thinner and can be damaged when tightening, becoming a focal point for corrosion. We recommend use for indoor use.
The declared pull force (3.42 kg) refers to ideal contact with a thick steel plate. Actual force depends on metal thickness and distance (e.g. paint layer). The magnet with a hole has slightly less active surface than a solid cylinder, but still offers powerful force. When mounted on a wall (shear force), the magnet will hold approx. 20-30% of its nominal pull force.

Pros and cons of rare earth magnets.

Besides their tremendous pulling force, neodymium magnets offer the following advantages:

  • They do not lose power, even during approximately 10 years – the decrease in lifting capacity is only ~1% (theoretically),
  • They do not lose their magnetic properties even under close interference source,
  • A magnet with a shiny gold surface has an effective appearance,
  • Magnets are characterized by exceptionally strong magnetic induction on the outer side,
  • Neodymium magnets are known for strong magnetic induction and the ability to work at temperatures up to 230°C or higher (depending on the magnetic form),
  • Thanks to flexibility in forming and the capacity to customize to complex applications,
  • Versatile presence in electronics industry – they are utilized in HDD drives, drive modules, advanced medical instruments, and complex engineering applications.
  • Compactness – despite small sizes they generate large force, making them ideal for precision applications

Disadvantages of NdFeB magnets:

  • Susceptibility to cracking is one of their disadvantages. Upon strong impact they can break. We advise keeping them in a strong case, which not only secures them against impacts but also raises their durability
  • When exposed to high temperature, neodymium magnets suffer a drop in strength. 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
  • They oxidize in a humid environment - during use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
  • We suggest a housing - magnetic holder, due to difficulties in producing threads inside the magnet and complex shapes.
  • Health risk related to microscopic parts of magnets can be dangerous, in case of ingestion, which is particularly important in the context of child health protection. It is also worth noting that small elements of these devices are able to complicate diagnosis medical when they are in the body.
  • High unit price – neodymium magnets are more expensive than other types of magnets (e.g. ferrite), which hinders application in large quantities

Magnetic strength at its maximum – what affects it?

The load parameter shown represents the maximum value, obtained under laboratory conditions, namely:

  • on a block made of structural steel, optimally conducting the magnetic flux
  • whose thickness reaches at least 10 mm
  • with an ground contact surface
  • without any clearance between the magnet and steel
  • for force applied at a right angle (pull-off, not shear)
  • at ambient temperature room level

Lifting capacity in real conditions – factors

Effective lifting capacity impacted by working environment parameters, including (from priority):

  • Space between magnet and steel – even a fraction of a millimeter of distance (caused e.g. by veneer or unevenness) significantly weakens the pulling force, often by half at just 0.5 mm.
  • Pull-off angle – note that the magnet holds strongest perpendicularly. Under shear forces, the holding force drops drastically, often to levels of 20-30% of the nominal value.
  • Element thickness – to utilize 100% power, the steel must be adequately massive. Thin sheet restricts the attraction force (the magnet "punches through" it).
  • Chemical composition of the base – mild steel attracts best. Alloy admixtures lower magnetic properties and lifting capacity.
  • Surface condition – ground elements ensure maximum contact, which increases force. Rough surfaces weaken the grip.
  • Thermal environment – temperature increase causes a temporary drop of induction. It is worth remembering the maximum operating temperature for a given model.

* Holding force was tested on the plate surface of 20 mm thickness, when a perpendicular force was applied, whereas under shearing force the holding force is lower. Additionally, even a minimal clearance {between} the magnet and the plate reduces the holding force.

Handle Neodymium Magnets Carefully

You should keep neodymium magnets at a safe distance from the wallet, computer, and TV.

Strong 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. They can also damage televisions, VCRs, computer monitors, and CRT displays. You should especially avoid placing neodymium magnets near electronic devices.

The magnet is coated with nickel - be careful if you have an allergy.

Studies clearly indicate a small percentage of people who suffer from metal allergies such as 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.

Neodymium magnets are the strongest magnets ever created, and their power can shock you.

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

Neodymium magnets can become demagnetized at high temperatures.

Despite the general resilience of magnets, their ability to retain their magnetic strength can be influenced by factors like the type of material used, the magnet's shape, and the intended purpose for which it is employed.

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 happens because such devices have a function to deactivate them in a magnetic field.

  Neodymium magnets should not be around children.

Remember that neodymium magnets are not toys. Do not allow children to play with them. In the case of swallowing multiple magnets simultaneously, they can attract to each other through the intestinal walls. In the worst case scenario, this can lead to death.

Under no circumstances should neodymium magnets be brought close to 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 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.

Magnets will crack or crumble with uncontrolled connecting to each other. Remember not to move them to each other or have them firmly in hands at a distance less than 10 cm.

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 magnetic are delicate as well as can easily crack as well as get damaged.

Neodymium magnets are characterized by significant fragility. 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.

Caution!

In order for you to know how strong neodymium magnets are and why they are so dangerous, read the article - Dangerous very powerful neodymium magnets.

Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98