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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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Specifications along with structure of neodymium magnets can be tested using our power calculator.

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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

It is ideally suited for places where solid attachment of the magnet to the substrate is required without the risk of detachment. Mounting is clean and reversible, unlike gluing. It is also often used in advertising for fixing signs and in workshops for organizing tools.
This is a crucial issue when working with model MP 30x6x10 / N38. Neodymium magnets are sintered ceramics, which means they are very brittle and inelastic. When tightening the screw, you must maintain great sensitivity. We recommend tightening manually with a screwdriver, not an impact driver, because too much pressure will cause the ring to crack. The flat screw head should evenly press the magnet. Remember: cracking during assembly results from material properties, not a product defect.
Moisture can penetrate micro-cracks in the coating and cause oxidation of the magnet. In the place of the mounting hole, the coating is thinner and can be damaged when tightening the screw, which will become a corrosion focus. If you must use it outside, paint it with anti-corrosion paint after mounting.
The inner hole diameter determines the maximum size of the mounting element. For magnets with a straight hole, a conical head can act like a wedge and burst the magnet. Always check that the screw head is not larger than the outer diameter of the magnet (30 mm), so it doesn't protrude beyond the outline.
It is a magnetic ring with a diameter of 30 mm and thickness 10 mm. The pulling force of this model is an impressive 3.42 kg, which translates to 33.54 N in newtons. The mounting hole diameter is precisely 6 mm.
The poles are located on the planes with holes, not on the sides of the ring. If you want two such magnets screwed with cones facing each other (faces) to attract, you must connect them with opposite poles (N to S). We do not offer paired sets with marked poles in this category, but they are easy to match manually.

Pros and cons of neodymium magnets.

Besides their stability, neodymium magnets are valued for these benefits:

  • They do not lose strength, even after around 10 years – the decrease in lifting capacity is only ~1% (theoretically),
  • Magnets perfectly defend themselves against demagnetization caused by ambient magnetic noise,
  • A magnet with a metallic silver surface looks better,
  • Magnetic induction on the top side of the magnet is extremely intense,
  • Due to their durability and thermal resistance, neodymium magnets can operate (depending on the form) even at high temperatures reaching 230°C or more...
  • Thanks to versatility in forming and the capacity to adapt to complex applications,
  • Versatile presence in modern technologies – they are used in mass storage devices, electromotive mechanisms, medical equipment, also multitasking production systems.
  • Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in compact dimensions, which enables their usage in miniature devices

Cons of neodymium magnets: weaknesses and usage proposals

  • They are fragile upon too strong impacts. To avoid cracks, it is worth protecting magnets in special housings. Such protection not only shields the magnet but also increases its resistance to damage
  • Neodymium magnets lose their strength under the influence of heating. As soon as 80°C is exceeded, many of them start losing their power. Therefore, we recommend our special magnets marked [AH], which maintain stability even at temperatures 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 those in rubber or plastics, which secure oxidation as well as corrosion.
  • Limited possibility of making threads in the magnet and complicated shapes - preferred is casing - magnet mounting.
  • Health risk to health – tiny shards of magnets can be dangerous, in case of ingestion, which gains importance in the aspect of protecting the youngest. It is also worth noting that small elements of these magnets can be problematic in diagnostics medical when they are in the body.
  • Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Magnetic strength at its maximum – what contributes to it?

The lifting capacity listed is a result of laboratory testing conducted under standard conditions:

  • on a block made of structural steel, optimally conducting the magnetic flux
  • possessing a thickness of minimum 10 mm to ensure full flux closure
  • with a plane perfectly flat
  • with zero gap (without coatings)
  • under perpendicular force vector (90-degree angle)
  • at ambient temperature approx. 20 degrees Celsius

Impact of factors on magnetic holding capacity in practice

In practice, the actual holding force is determined by several key aspects, ranked from crucial:

  • Air gap (between the magnet and the plate), since even a microscopic clearance (e.g. 0.5 mm) can cause a drastic drop in force by up to 50% (this also applies to paint, rust or dirt).
  • Loading method – catalog parameter refers to detachment vertically. When attempting to slide, the magnet exhibits significantly lower power (often approx. 20-30% of nominal force).
  • Wall thickness – the thinner the sheet, the weaker the hold. Magnetic flux penetrates through instead of generating force.
  • Metal type – different alloys attracts identically. High carbon content worsen the attraction effect.
  • Smoothness – full contact is possible only on smooth steel. Rough texture create air cushions, reducing force.
  • Thermal factor – high temperature reduces pulling force. Too high temperature can permanently damage the magnet.

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

Safety rules for work with NdFeB magnets

Sensitization to coating

Studies show that nickel (the usual finish) is a strong allergen. If you have an allergy, refrain from touching magnets with bare hands and opt for versions in plastic housing.

Beware of splinters

Despite the nickel coating, the material is brittle and cannot withstand shocks. Do not hit, as the magnet may shatter into sharp, dangerous pieces.

Physical harm

Risk of injury: The attraction force is so immense that it can result in blood blisters, crushing, and broken bones. Use thick gloves.

Pacemakers

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

Fire risk

Drilling and cutting of NdFeB material poses a fire hazard. Magnetic powder oxidizes rapidly with oxygen and is hard to extinguish.

Phone sensors

Navigation devices and mobile phones are extremely sensitive to magnetism. Direct contact with a strong magnet can permanently damage the internal compass in your phone.

Threat to electronics

Data protection: Neodymium magnets can ruin data carriers and sensitive devices (heart implants, medical aids, mechanical watches).

Powerful field

Before use, read the rules. Uncontrolled attraction can break the magnet or injure your hand. Think ahead.

Do not give to children

Strictly store magnets away from children. Ingestion danger is high, and the consequences of magnets clamping inside the body are fatal.

Power loss in heat

Watch the temperature. Exposing the magnet to high heat will destroy its magnetic structure and pulling force.

Attention!

Learn more about risks in the article: Magnet Safety Guide.

Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98