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neodymium magnets

We provide blue color magnets Nd2Fe14B - our offer. Practically all "neodymium magnets" on our website are available for immediate purchase (see the list). Check out the magnet pricing for more details see the magnet price list

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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 MP 30x6x10 / N38 is created for mechanical fastening, where glue might fail or be insufficient. Thanks to the hole (often for a screw), this model enables easy screwing to wood, wall, plastic, or metal. It is also often used in advertising for fixing signs and in workshops for organizing tools.
This material behaves more like porcelain than steel, so it doesn't forgive mistakes during mounting. 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. It's a good idea to use a rubber spacer under the screw head, which will cushion the stresses. Remember: cracking during assembly results from material properties, not a product defect.
These magnets are coated with standard Ni-Cu-Ni plating, which protects them in indoor conditions, but is not sufficient for rain. In the place of the mounting hole, the coating is thinner and easily scratched when tightening the screw, which will become a corrosion focus. This product is dedicated for indoor use. For outdoor applications, we recommend choosing rubberized holders or additional protection with varnish.
The inner hole diameter determines the maximum size of the mounting element. If the magnet does not have a chamfer (cone), we recommend using a screw with a flat or cylindrical head, or possibly using a washer. Aesthetic mounting requires selecting the appropriate head size.
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 product has a [NiCuNi] coating and is made of NdFeB material. Inner hole dimension: 6 mm.
These magnets are magnetized axially (through the thickness), which means one flat side is the N pole and the other is S. 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). When ordering a larger quantity, magnets are usually packed in stacks, where they are already naturally paired.

Advantages and disadvantages of neodymium magnets.

Besides their immense field intensity, neodymium magnets offer the following advantages:

  • They retain attractive force for almost ten years – the loss is just ~1% (in theory),
  • Neodymium magnets are distinguished by exceptionally resistant to demagnetization caused by magnetic disturbances,
  • In other words, due to the aesthetic layer of silver, the element looks attractive,
  • Magnets are distinguished by exceptionally strong magnetic induction on the surface,
  • Thanks to resistance to high temperature, they can operate (depending on the shape) even at temperatures up to 230°C and higher...
  • Thanks to the potential of accurate shaping and adaptation to custom requirements, NdFeB magnets can be manufactured in a variety of forms and dimensions, which increases their versatility,
  • Universal use in modern industrial fields – they are used in HDD drives, electric drive systems, medical equipment, also technologically advanced constructions.
  • Compactness – despite small sizes they generate large force, making them ideal for precision applications

Drawbacks and weaknesses of neodymium magnets and proposals for their use:

  • Brittleness is one of their disadvantages. Upon intense impact they can break. We advise keeping them in a strong case, which not only secures them against impacts but also increases their durability
  • Neodymium magnets lose their power 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 usually rust. For applications outside, it is recommended to use protective magnets, such as those in rubber or plastics, which prevent oxidation as well as corrosion.
  • Due to limitations in creating nuts and complicated shapes in magnets, we recommend using cover - magnetic mount.
  • Health risk resulting from small fragments of magnets can be dangerous, in case of ingestion, which becomes key in the context of child safety. It is also worth noting that small elements of these products can be problematic in diagnostics medical when they are in the body.
  • With large orders the cost of neodymium magnets can be a barrier,

Maximum magnetic pulling forcewhat it depends on?

The load parameter shown concerns the peak performance, obtained under ideal test conditions, specifically:

  • on a block made of mild steel, effectively closing the magnetic field
  • with a thickness no less than 10 mm
  • with an ideally smooth contact surface
  • without any insulating layer between the magnet and steel
  • for force applied at a right angle (pull-off, not shear)
  • in stable room temperature

What influences lifting capacity in practice

Bear in mind that the working load will differ depending on elements below, in order of importance:

  • Distance – the presence of any layer (rust, tape, air) acts as an insulator, which lowers capacity steeply (even by 50% at 0.5 mm).
  • Direction of force – highest force is obtained only during perpendicular pulling. The force required to slide of the magnet along the plate is usually many times lower (approx. 1/5 of the lifting capacity).
  • Plate thickness – too thin steel does not accept the full field, causing part of the flux to be escaped into the air.
  • Material composition – different alloys attracts identically. High carbon content worsen the attraction effect.
  • Plate texture – smooth surfaces ensure maximum contact, which improves force. Rough surfaces reduce efficiency.
  • Temperature influence – hot environment weakens magnetic field. Exceeding the limit temperature can permanently demagnetize the magnet.

* Lifting capacity testing was carried out on a smooth plate of optimal thickness, under a perpendicular pulling force, whereas under attempts to slide the magnet the load capacity is reduced by as much as 5 times. Moreover, even a small distance {between} the magnet’s surface and the plate reduces the holding force.

Safety rules for work with neodymium magnets

Maximum temperature

Control the heat. Heating the magnet above 80 degrees Celsius will permanently weaken its properties and strength.

Threat to navigation

A powerful magnetic field interferes with the operation of magnetometers in phones and GPS navigation. Keep magnets close to a smartphone to prevent damaging the sensors.

Shattering risk

NdFeB magnets are ceramic materials, which means they are prone to chipping. Clashing of two magnets will cause them shattering into small pieces.

Allergic reactions

Some people have a sensitization to nickel, which is the standard coating for neodymium magnets. Frequent touching may cause dermatitis. We strongly advise wear safety gloves.

Protect data

Equipment safety: Strong magnets can damage payment cards and delicate electronics (pacemakers, hearing aids, timepieces).

Do not underestimate power

Exercise caution. Neodymium magnets act from a long distance and connect with huge force, often faster than you can move away.

Danger to the youngest

Neodymium magnets are not suitable for play. Accidental ingestion of multiple magnets can lead to them pinching intestinal walls, which constitutes a severe health hazard and necessitates urgent medical intervention.

Crushing force

Big blocks can break fingers instantly. Under no circumstances place your hand between two strong magnets.

Combustion hazard

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

Life threat

Health Alert: Neodymium magnets can deactivate pacemakers and defibrillators. Do not approach if you have medical devices.

Important!

Details about hazards in the article: Magnet Safety Guide.

Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98